Student combines a solution of NaCl (aq)with a solution of AgNO₃ (aq), and a precipitate forms evidence that ionic bonds formed during the precipitation is The precipitate has a high melting point. The correct answer is C.
Ions with opposing charges join together to create ionic bonds. The strong electrostatic forces of attraction between the oppositely charged ions cause them to melt at a high temperature.
What happens when precipitation reaction occurs?In ionic or aqueous solutions, the precipitation reaction takes place. Since the ions actively participate in the reaction and produce the product, precipitation reactions are also referred to as ionic reactions. Temperature, solution concentration, buffer solution, and other factors all affect how these reactions behave.
Precipitates are the insoluble salts created during precipitation reactions. Precipitation reactions are often double displacement events that result in the formation of the precipitate, a solid form of residue.
Ionic linkage. If an atom receives electrons, it becomes a negatively charged ion (cation), but if it loses them, it becomes a positively charged ion (cation) ( anion ). Following is a quick discussion on ionic bonds. To learn more, go to chemical bonding: the ionic bonding process.
Your question is incomplete but most probably your full question was
A student combines a solution of NaCl(aq)NaCl(aq) with a solution of AgNO3(aq)AgNO3(aq), and a precipitate forms. Which of the following is evidence that ionic bonds formed during the precipitation?
A) The resulting solution is colorless.
B) The resulting solution conducts electricity.
C) The precipitate has a high melting point.
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HELP PLEASE NEED THIS RIGHT NOW!!!!
(03.02 HC)
Use the portion of the periodic table shown below to answer the questions.
A portion of the first three columns of the periodic table is shown. Column one from top to bottom reads 11 sodium 22.990, 19 potassium 39.098, and 37 rubidium 85.468. Column two reads 12 magnesium 24.305, 20 calcium 40.078, and 38 strontium 87.62. Column three reads 21 scandium 44.956 and 39 yttrium 88.906.
Part 1: Name two elements that have the same properties as magnesium (Mg). (4 points)
Part 2: Determine the number of protons, electrons, and neutrons present in an atom of potassium (K). Explain how you determined your answer using complete sentences. (6 points) (10 points)
Two elements that have the same properties as magnesium are calcium and strontium.
The number of protons in potassium, K = 19
the number of electrons in potassium, K = 19
The number of neutrons in potassium, K = 20
What is the Periodic Table?The Periodic Table is a table that arranges the elements in order of increasing atomic number into vertical columns called groups and horizontal rows called periods.
Elements in the same period have the same number of electron shells or energy levels.
Elements in the same group have the same number of valence electrons or outermost shell electrons.
Considering the given data:
The elements in group 1 are sodium, potassium, and rubidium.
The elements in group 2 are magnesium, calcium, and strontium.
The elements in group 3 are scandium and yttrium.
The number of protons, electrons, and neutrons present in an atom of potassium (K) is determined by the atomic number and mass number of potassium.
Atomic number = number of protons
Number of proton = number of electrons in a neutral atom
Number of neutrons = mass number - atomic number
The atomic number of potassium = 19
mass number = 39
number of neutrons = 39 - 19
number of neutrons = 20
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What is the wavelength of a radio wave with a frequency of 150hz
Answer:
2.00 x 10⁶ m
Explanation:
To find the wavelength, you need to use the following equation:
c = λf
In this equation,
-----> c = speed of light (3.00 x 10⁸ m/s)
-----> λ = wavelength (m)
-----> f = frequency (Hz)
To find the wavelength, you can plug the given value and the constant into the equation and solve for "λ".
c = λf <----- Equation
3.00 x 10⁸ m/s = λ(150 Hz) <----- Insert values
2.00 x 10⁶ = λ <----- Divide both sides by 150 Hz
During an investigation a scientist heated 2.76 g of silver carbonate till it decomposed to leave a silver residue. The total mass of the silver residue formed was 2.16 g. Does the law of conservation of mass hold true in this case?
The given statement "Does the law of conservation of mass hold true in this case?" is true because the the sum of the masses of A and B is equal to the mass of AB that reacts.
What is the law of conservation of mass?The law of conservation of mass states that mass can neither be created nor destroyed during the course of reactions but can however be converted to other forms during the course of reactions. Following this rule, if AB reacts to produce A and B, the sum of the masses of A and B must be equal to the mass of AB that reacts.
While the silver residue produced is a solid that is easily recoverable, the other two products are gases that could escape into the surrounding atmosphere unless specially collected or if the reaction is conducted in an enclosed space.
Thus, the fact that only 2.16 g of silver residue was formed does not mean that the law of conservation was not supported by the reaction. The remaining mass would be that of the gases that could have escaped during the course of the reaction.
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For practice in counting microstates, determine how many ways there are to arrange 2 quanta among 3 one-dimensional oscillators. (3 oscillators correspond to one atom.)
There are 6 possible arrangements for 3 one-dimensional oscillators using 2 quanta.
What distinguishes a system's state from its microstate?A collection of circumstances, typically involving temperature and pressure, is referred to as a thermodynamic state and it determines how a bulk material behaves. A stipulated is a single possible configuration of the locations and kinetic energy of all molecules present in the sample; it is a record of the positions and velocities at a certain moment.
Briefing:Therefore, if there are three one-dimensional oscillators, there are three locations for which we may work (0000), and if there are three quanta, we are dealing with two digits that we can divide in many ways.
Our combos are (2, 0, 0), (0, 2, 0),(0,0,2) (1, 1, 0), and (1, 0, 1). (0,1,1).
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Molarity ____0.314______ M
SHOW YOUR WORK for the molarity calculation:
Molarity = Number of Moles of solute / Volume in Liters of solvent
= 0.00314 mols / 0.01 L
= 0.314 M
is this the correct way to write the expression for molarity?
Answer:
Yes
Explanation:
Molarity is the amount of moles of a solute per every 1 liter. It can be expressed in the units moles/L or simplified to M.
Some 2-methyl-2-butene may beproduced in the reaction as a by-product. Give the mechanism forits production.
2-methyl-2-
butanol to form2-methyl-2-butene.
2-methyl-2-
butanol to form 2-methyl-2-butene.
Two substituents are taken out of the reactant molecule in an elimination reaction to create the product.
In a one- or two-step method, two substituents are eliminated from a molecule in an organic reaction known as an elimination reaction. Atoms are eliminated as molecules and compounds during an elimination reaction. Two substituents are taken out of the reactant molecule in an elimination reaction to create the product. A metal, an acid, or a base typically catalyze elimination. E1 and E2 reactions are the two primary categories of elimination processes in organic chemistry. Both E1 and E2 processes are also known as alcohol elimination reactions and alkyl halide elimination reactions, respectively. Any organic chemical reaction known as an elimination reaction in which two atoms and groups of atoms are eliminated.
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select the glassware that must be used when preparing a dilute solution of known concentration from a stock solution of higher concentration: A) graduated cylinder beaker B) volumetric flask C) graduated cylinder, volumetric flask D) graduated pipet, Erlenmeyer flask E) graduated cylinder, beaker F) graduated pipet, volumetric flask
The glassware that must be used when preparing a dilute solution of known concentration from a stock solution of higher concentration is (F) graduated pipet and volumetric flask.
A graduated pipette is a pipette that has the volume marked along the tube in increments. It is employed to precisely quantify and transfer a liquid volume between containers. It has a tapering tip and is composed of glass or plastic tubes. Graduation markings along the tube's body show the capacity from the tip to certain points.
Volumetric flasks, also known as graduated flasks or measuring flasks, are pieces of laboratory glassware or plasticware that are calibrated and labeled to contain a particular volume of reagents, solvents, or any other liquids. Other names for volumetric flasks are measuring flasks and graded flasks. Chemical solutions are frequently made using volumetric flasks.
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1. Draw the major organic substitution product (ignoring stereochemistry) formed in the following reaction as a skeletal structure.(There is chemistry reaction image here)2. If the reactant's configuration were (1R, 2R, 4R), then the configuration of the substitution product(s) will be _____.
The replacement product won't have a R or S configuration because there isn't a chiral carbon atom of that kind.
What exactly does "chiral carbon atom" mean?As a general rule, chiral carbon centers are carbon atoms positioned at the four corners of a tetrahedron and attached to four distinct substituents. Steeogenic carbons and asymmetrical carbon atoms are other names for chiral carbon atoms.
What are a substitution reaction's byproducts?In the substitution reaction, an electron-rich species (the oxygen) donates two electrons to an electron-poor species (the carbon), creating a new base and product (the alcohol) in the process.
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A student dissolved 60g of KNO3 in 100mL of water at 70°C.
120
110
100
90
80
Solubility (grams of solute/100 g H₂0)
70
60
50
40
30
20
10
NaNO
< Previous
FONX
KCI
Naci
50
Temperature (°C)
Based on the solubility curve and information above, the solution at 70°C is
O an unsaturated solution.
Too
Based on the solubility curve and information above, the solution at 70°C is an unsaturated solution.
What is a solubility curve?A solubility curve is a curve that is obtained when the mass of solute that dissolves in a given volume of solvent is plotted against the temperature of the solution.
Solubility curves are useful in determining the amount of solute that can be dissolved in a given volume of solvent.
A saturated solution can not dissolve more solute at that temperature.
An unsaturated age can dissolve more solute at the given temperature.
Considering the given data:
The student dissolved 60g of KNO3 in 100 mL of water at 70°C.
The given solubility curve shows that about 130 g of solute can dissolve in 100 g of water.
Hence, the solution is an unsaturated solution.
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You are in charge of making Kool-Aid for a fundraiser. You need to mix the
powder into the water as fast as you can. How could you use your knowledge of
reaction rates to increase the speed at which you can mix the Kool-Aid? (Please
write 2-5 sentences.)
Calculating H⁺ and OH⁻
Calculate H⁺ or OH⁻ as required for each of the following solutions at 25 C°, and state whether the solution is neutral, acidic, or basic.
a. 1.0 × 10⁻⁵ M OH⁻
b. 1.0 × 10⁻⁷ M OH⁻
c. 10.0 M H+
a) The number of H⁺ ions is 10⁻⁹ and it is basic.
b) The number of H⁺ ions is 10⁻⁷ and it is neutral.
c) The number of OH⁻ ions is 10⁻¹³ and it is acidic.
What is pH?Water's pH position indicates how acidic or introductory it is. The range is 0 to 14, with 7 acting as a neutral value. A pH of lesser than 7 denotes a base, while one of lower than 7 suggests acidity.
The pH scale really measures the proportion of free hydrogen and hydroxyl ions in water. Water that contains further free hydrogen ions is acidic, whereas further free hydroxyl ions makes water more introductory. Since chemicals in the water can alter pH, pH is a pivotal sign of a chemical change in the water. In" logarithmic units," pH is expressed. Each value signifies a10-fold variation in the water's acidity or basicness. Ten times as acidic as water because water has a pH of five.
a) [H⁺] = 1 x 10⁻¹⁴/1 x 10⁻⁵ = 10⁻⁹.
Since the [H⁺] < [OH⁻] the solution is basic.
b) [H⁺] = 1 x 10⁻¹⁴/1 x 10⁻⁷ = 10⁻⁷
since the [H⁺] = [H⁺]
The solution is neutral
c) [OH⁻] = 1 x 10⁻¹⁴/1 x 10⁺ = 10⁻¹³
since the [H⁺] > [OH⁻]
the solution is acidic
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With reference to the following:
Eric Jaffe’s seminal paper on culture of human umbilical vein endothelial cells (Jaffe et al., 1973) recommends using supplemented M199 culture medium. The basic medium contains common electrolytes at the following millimolar concentrations:
Na+ (164), K+ (5.8), Ca++ (1.26), Mg++ (0.81), Cl- (145), HPO42- (0.78), HCO3- (26.1), SO42- (1.26). It also contains glucose (5.6 mM), amino acids and phenol red (a pH indicator).
The recommended supplements (to be added immediately before use) are foetal calf serum (20% v/v) to provide growth factors, penicillin (200 units ml-1) and streptomycin (200 µgml-1) to prevent bacterial contamination, and L-glutamine (2 mM), a labile amino acid that does not survive storage.
The RMM of L-glutamine is 146 gmol-1. How much L-glutamine will you need to weigh out to add to 500 ml of your complete medium?
Group of answer choices
291 mg
73 mg
146 mg
2.91 g
146 g
Answer: HCO3- and HPO4 2-
Explanation:the electrolytes work as a buffer which lies in 7 the less than 7 would be acidic and more than 7 would be basic. So they work as a buffer to maintain pH of 7
which of the following structural features determine the relative reactivity of carboxylic acid derivatives? select all that apply.
The capacity of the electronegative leaving group to activate the carbonyl is connected to the relative reactivity of carboxylic acid derivatives toward nucleophile replacements. The carbonyl's electron density was taken from it by the more electronegative leaving groups, enhancing its electrophilicity.
ROCl (Acid Chloride) is the most reactive derivative of carboxylic acid.
The substituent becomes more electrophilic and reactive if it is electron withdrawing.
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What is the boiling point, in °C,
of a 0.321 molal aqueous
solution of NaCl?
BP(water) = 100 °C
Kb (water) = 0.512 °C/m
[?] °C
Answer:
the boiling point of solution at 3 decimal point is 100.329०C Ans.
Explanation:
given data -
molality of Nacl = 0.321 m
molal boiling point elevation constant (Kb) =0.512०C/m
# formula of change of boiling point of sample =
∆ Tb =i × Kb × m
Kb = molal boiling point of elevation constant
m = molality
i = vont's hoff factor.
Nacl is strong electrolyte and its 100% dissociate so the value of i for Nacl is 2
put value in the formula
∆ Tb = 2 × 0.512 ०C/m × 0.321m
= 0.3287
= 0.329०C
∆Tb = T'b - Tb
T'b = boiling point of solution
Tb= boiling point of solvent( water)
0.329०C = T'b - 100०c ( boiling point of water = 100०C)
T'b = 0.329०C + 100०C
= 100.329०C
List the following transition metal coordination compounds by their d electron count, with the highest at the top and the lowest at the bottom. [Fe(OH2).]3+ [MnO4] - [NiCl4]2- [Co(H2O).]3+ III
The most and least d electron count transition metal coordination complexes are [NiCl4]2- and [Co(H2O)]3+, respectively. [MnO4]-, [Fe(OH2)] 3+.
Who or what is an electron?A negative charges subatomic particle known as an electron can either be free or attached to an atoms (not bound). One of three types of components within an atom is an electrons that is bonded to it; both other two are particles and neutrons.
What exactly are atoms and electrons?The negative charges components of an atom are called electrons. The total negative charge of an atom's electrons counteracts the charge of its proton in the nucleus of an atom.
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If metal ions in a solution we're reduced, what would you expect to see ?
Answer: You would expect to see the ions turn into metal.
Hope this helps :)
Explanation:
Metal ions in their reduced form are the metal in their elemental phase. If you have a solution containing metal ions and they are reduced, you will notice the metal deposition.
https:which of the following options correctly describe the hydrolysis of an ester under acidic conditions? select all that apply.
The correct answer to the given question about hydrolysis of an ester under acidic conditions is option a, c and d.
The given reaction of hydrolysis of an ester under acidic conditions is reversible equilibrium, traces acid, and produces a carboxylic acid and an alcohol
As in the substitution reaction of a carboxylic acid and an alcohol, an ester is a molecule produced from an oxoacid (organic or inorganic) in which at least one hydroxyl. Since glycerides are one of the main groups of lipids and make up the majority of animal fats and vegetable oils, they are significant in biology.
Most esters have a pleasant aroma; those with a low molecular weight are frequently utilized as fragrances and can be found in pheromones and essential oils. They are one of the most prevalent kinds of synthetic lubricants on the market and serve as high-grade solvents for a variety of plastics, plasticizers, resins, and lacquers.
Question
which of the following options correctly describe the hydrolysis of an ester under acidic conditions? select all that apply.
a- this reaction is catalyzed by a trace amount of acid
b- this reaction produces a carboxylate salt and an alcohol.
c- this reaction produces a carboxylic acid and an alcohol
d- the reaction is a reversible equilibrium
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Assume you have a solution containing the pyruvate dehydrogenase complex and all the enzymes of the citric acid cycle, but none of the metabolic intermediates. When you supplement this solution with 5 μmol each of pyruvate, oxaloacetate, coenzyme A, NAD+, FAD, GDP, and Pi, you find that 5 μmol of CO2 are evolved and then the reaction stops. When you add alcohol dehydrogenase and its substrate acetaldehyde, additional CO2 is produced. How do you explain this result?
How many μmoles of acetaldehyde are required to allow complete oxidation of the pyruvate to 15 μmol of CO2?
The answer is CoA and 10μmol due to which additional CO₂ is produced.
Acetaldehyde is converted to ethanol with the help of the reaction catalyzed by alcohol dehydrogenase. This reaction results in the production of NAD+. The produced NAD+ is used to process the pyruvate dehydrogenase reaction, where additional CO₂ is also produced when pyruvate is converted to acetyl CoA.
10 μmol
10 micromoles of acetaldehyde are required to allow complete oxidation reaction of the pyruvate to 15μ moles of CO₂.
This above can be explained with the explanation that by adding additional alcohol dehydrogenase and its substrate we are actually allowing regeneration of NAD+. This is the reason why the presence of oxidized NAD+ the additional TCA reactions will take place and produces additional CO₂. So we will be getting 15 micromoles of pyruvate oxidized for 10 micromoles of acetaldehyde.
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A house is built with a granite countertop. The heat capacity of the countertop is 151.8 kJ/°C. A hot pan of water is placed on the countertop, and 4000 J of heat energy is transferred into the countertop. By how much does the temperature of the countertop change?
A house is built with a granite countertop. The temperature of the countertop change is 0.032 °C.
What is the transfer of heat?Transfer of heat or the transfer of heat energy from one body to another body.
Q = CΔT where Q = quantity of heat transferred to the countertop = 5000 J = 5 kJ, C = heat capacity of the countertop = 158.5 kJ/°C and ΔT = temperature change of the countertop.
Since we require the temperature change of the countertop, we make ΔT subject of the formula.
So, ΔT = Q/C
So, by substituting the variables into the equation:
ΔT = Q/C
ΔT = 5 kJ/158.5 kJ/°C
ΔT = 0.032 °C
Therefore, the temperature of the countertop change is 0.032 °C.
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Discuss a specific subculture to which you belong. What is it and why is it a subculture? Describe the social structures of the subculture. Is it analagous to, or different from, the dominant social structure of American society? Be sure to substantiate your dicussion with facts and examples.
There are numerous subcultures, such as hippies, anti-gun groups, high school jocks, environmental activists, people in the furry community, people in the cosplay community, punks, goths, and many more.
What are subcultures ?"An identifiable subgroup within a society or group of people, particularly one distinguished by beliefs or interests that differ from those of the larger group."
Subcultures are important in articulating an identity, creating a sense of belonging, and influencing members to think about their relationship to mainstream society; however, subcultures differ from widely recognized identity categories such as ethnicity.
Subcultures exist within a society's dominant culture. Subcultures in America include hippies, punk rockers, beatniks, and hipsters.
Thus, There are numerous subcultures, such as hippies, anti-gun groups, high school jocks, environmental activists, people in the furry community.
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Drawing were everything goes will be much appreciated it thank you
Following is the classification of given substances:
Atomic element: Ag
Molecular element: F₂
Molecular compound: CO
Ionic compound: PbI₄
What is a molecule?Molecules, groups of two or more atoms that form the smallest identifiable unit that can divide a pure substance and that retain the composition and chemical properties of that substance.
An atom consists of a single positively charged nucleus surrounded by a cloud of negatively charged electrons. As the atoms approach, the electron clouds interact with each other and with the nucleus. This interaction causes atoms to combine to form molecules when the energy of the entire system is reduced. From a structural point of view, a molecule consists of a collection of atoms joined by valences. A diatomic molecule contains two atoms chemically bonded together. When two atoms are identical, like oxygen (O2) molecules, they form a homonuclear diatomic molecule, but when the atoms are different, like carbon monoxide (CO) molecules, they are heteronuclear. Forms a diatomic molecule. Molecules containing two or more atoms are called polyatomic molecules. B. Carbon dioxide (CO2) and water (H2O). A polymer molecule can contain thousands of constituent atoms.
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the reactivity of carboxylic acid derivatives (the general structure is shown) depends on the character of the carbonyl carbon atom and the ability of atom z to stabilize the carbonyl group by . multiple choice question. nucleophilic; resonance nucleophilic; induction electrophilic; induction electrophilic; resonance
The reactivity of carboxylic acid derivatives depends on the electrophilic character of the carbonyl carbon atom and the ability of the z atom to stabilize the carbonyl group by resonance.
Carbon compounds are compounds whose main components are composed of carbon atoms (C), hydrogen (H), oxygen (O), nitrogen (N), sulfur (S), and other organic elements. Carbon compounds also have the ability to form carbon chains and bind various functional groups. One of the carbon compounds based on their functional group is a carboxylic acid.
Carboxylic acids are carbon compounds with the general formula R－COOH which are called carboxyl groups by combining a carbonyl group and a hydroxyl group. This compound can be prepared by strong oxidation of primary alcohols. Carboxylic acid derivatives have different stability and reactivity. The reactivity of carboxylic acid derivatives depends on the electrophilic character of the carbonyl carbon atom and the ability of the z atom to stabilize the carbonyl group by resonance.
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Write a balanced half-reaction for the reduction of gaseous oxygen (02) to aqueous hydrogen peroxide (H2O2) in acidic aqueous solution. Be sure to add physical state symbols where appropriate. x 6 ?
Two of O atom, two of H atom on both sides. The reduction of gaseous oxygen to aqueous hydrogen peroxide,when this reaction in acidic aqueous solution, and we need to balance H on both sides .
How to balance the equation?O2 (g) → H2O2 (l)
O2(g) + H+(aq) → H2O2(l)
O2(g) + 2H+(aq) → H2O2(l)
now, we need to balance 2 positive charge of 2H+ so, we will put 2 e- on left side:
O2(g) + 2H+(aq) + 2 e- → H2O2(l)
this is the final balanced equation which has equal no. of atoms on both sides:
2 of Oxygen atom, 2 of Hydrogen atom on both sides.
What is first order of reaction?A first-order reaction can be defined as, a chemical reaction in which the reaction rate is linearly dependent on the concentration of one reactant. In other words, a first-order reaction is a chemical reaction in which the rate varies on the changes in the concentration of one of the reactants.
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According to the balanced equation below, how many moles of ClO−2(aq) are needed to react completely with 20. mL of 0.20 M KMnO4 solution?
In order for 20 mL of 0.20 M KMnO4 solution to completely react, 3 m.mol of chlorite anion are needed. by a redox process.
How to fix?Reduction
MnO−4+4H++3e−→MnO2(s)+2H2O(l) I (i)
Oxidation ClO2 + 2 H2 O + ClO4 + 4 H + 4 e (ii)
Overall
4×(i)+3×(ii)4MnO−4+3ClO−2+4H+→4MnO2(s)+3ClO−4+2H2O(l)
Moles of KMnO4 equal 20 10 3L, 0.20 mol, and 1 = 4.0 10 3mol.
According to the equation, we require 3/4 equiv (or 4.0 10 3 mol) of chlorite anion.
How can molarity be used to identify moles?Molarity (M), which is determined by dividing the solute's mass in moles by the volume of the solution in liters, is the most widely used unit to express solution concentration: liters of solution/moles of solute equals M. One liter of a solution with a 1 molar concentration (1.00 M) contains 1.00 moles of solute.
How does molality translate into moles?Moles of solute divided by kilograms of solvent equals molality. Adding moles of a solvent = 3 and mass of solvent = 0.5 kg , we obtain molality = 3 / 0.5 = 6 mol/kg .
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Study Guide Unit 5
ICP
1) Distinguish between reactants and products.
a. The Law of Conservation of states that cannot be created nor destroyed.
b. are the substances that start a chemical reaction and are located on the side of the arrow in a chemical equation, while are the substances produced from the reaction and are located on the side of the arrow.
c. If the number of atoms in the reactants do not equal the number of atoms in the products we say the reaction is , if they do equal each other, we say the reaction is
d. A chemical equation is defined as.....
2. Understand how to classify types of reactions.
a. In your own words, explain how to recognize the following types of reactions. Use complete sentences and explain using vocabulary words.
i. Synthesis -
ii. Decomposition -
iii. Single Replacement -
iv. Double Replacement -
v. Combustion -
1) reactants are the starting material of a chemical reaction and are written on the left hand side of the equation
while
products are the end result of the reaction and are written on the right hand side of the equation
a) The law of conservation of energy states that energy can not be created nor be destroyed
b) reactants are the substances that start a chemical reaction and are located on the left hand side of the arrow in a chemical equation, while products are the substances produced from the reaction and are located on the right hand side of the arrow.
c)if the number of atoms in the reactants do not equal the number of atoms in the products we say the reaction is unbalanced if they do equal each other, we say the reaction is balanced
d) chemical equation can be defined as the symbolic representation of chemical reactions in which the reactants and products are expressed in terms of their respective chemical formulae
2) combination reaction
decomposition reaction
single replacement reaction
double replacement reaction
combustion reaction
2 i synthesis is the production of chemical compounds by reaction from simpler materials
ii. Decomposition means to break up into constituent part by or as if by a chemical process
iii. single replacement is a reaction in which one element is substituted for another element in a compound
iv. Double replacement have two ionic compounds that are exchanging anions or cations
v. combustion means a chemical reaction between substances, usually including oxygen and usually accompanied by the generation of heat and light in form of flame.
Which part of the brain could be damaged if the patient has difficulty in creating and organizing sentences?
Damage to frontal lobe neurons or tissue can result in personality changes, difficulty concentrating or planning, and impulsivity. The frontal lobe of the brain could be damaged if the patient has difficulty in creating and organizing sentences.
What is frontal lobe ?The frontal lobes are found directly behind the brow. The frontal lobes are the largest lobes in the human brain and the most commonly injured region in traumatic brain injury.
The frontal lobe is in charge of higher cognitive functions such as memory, emotions, impulse control, problem-solving, social interaction, and motor function as a whole.
The frontal lobe of the brain is in charge of high-level cognitive abilities as well as primary motor functions. It is the hub of our personality and communication skills.
Thus, The frontal lobe of the brain could be damaged if the patient has difficulty in creating and organizing sentences.
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3. Which of the following changes are classified as physical changes?
melting butter until it turns a dark brown
O cutting an apple into smaller pieces
burning toast
boiling silver
burning wood
blending carrots for a fruit and vegetable smoothie
O carving wood
dissolving sugar in hot tea
melting gold
petrifying wood
O peeling a potato
Calculate the hydroxide ion concentration, [OH−] , for a solution with a pH of 7.08 .
Answer: [tex][\text{OH}^{-}}]=10^{-6.92} \text{ M}[/tex]
Explanation:
[tex]\text{pH}+\text{pOH}=14\\\\7.08+\text{pOH}=14\\\\\text{pOH}=6.92\\\\\\\text{pOH}=-\log([\text{OH}^{-}}])\\\\6.92=-\log([\text{OH}^{-}}])\\\\[/tex]
[tex][\text{OH}^{-}}]=10^{-6.92} \text{ M}[/tex]
What is the concentration of iron (III) nitrate in a solution prepared by dissolving 44.1 g of Fe(NO3)3
in 478 mL of water
A- 0.000381 M Fe(NO3)3
B- 92.3 M Fe(NO3)3
C- 2.62 M Fe(NO3)3
D- 0.381 M Fe(NO3)3
E- 0.182 M Fe(NO3)3
Answer:
0.381 mol/L
Explanation:
"Concentration" is another word for Molarity (at least in this context). Molarity (M) is defined as:
M = mol/L
To find the concentration/molarity, you'll need to find the number of moles of iron (III) nitrate divided by the liters of the solution.
1. Convert grams to moles
You first need to calculate the molar mass of iron (III) nitrate, so you can convert the grams to moles. To do this, you add the masses of each atom in the compound (the masses of each atom can be found from the periodic table).
Fe (iron) has a mass of 55.845 g
N (nitrogen) has a mass of 14.007 g
O (oxygen) has a mass of 16 g
(1 x 55.845) + 3(14.007 + (16 x 3)) = 241.88 g/mol
193.9 is iron (III) nitrate's molar mass, so now you can divide the grams you have by its molar mass to get the number of moles.
44.1/241.88 = 0.1823 mol
2. Convert mL to L
There are 1000 milliliters in 1 liter, so you can divide the number of mL by 1000 to get the number of liters.
478/1000 = 0.478 L
3. Calculate Molarity/concentration
M = mol/L
M = 0.1823/0.478
M = 0.381
Element widths in responsive designs are often specified in percentages with the size of each element relative to ___ .
Element widths in responsive designs are often specified in percentages with the size of each element relative to the width of its parent.
Responsive design refers to an approach of web page creation that involves use of flexible layouts, flexible images, and cascading style sheet media queries. The objective of responsive design is to develop web pages that detect the visitor's screen size and orientation and change the layout accordingly. In other words, responsive web design refers to a method that simply reflows, adjust, reposition, resize overall content and images according to width of browser or screen size. Responsive websites are designed to provide accessibility across all devices regardless of size of device screen. Element widths in responsive designs are often represents a percentage value which is often used to define a size as relative to an element's parent object.
Learn more about Responsive design:
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