The percent composition is calculated by dividing the mass of an atom by the total mass of the compound multiplied by 100.
percentage of atom= (mass of atom/molecular mass) X 100
The atomic weight of magnesium Mg is 24.3. The atomic weight of oxygen is 16.0.
The total mass is (24.3+16.0 = 40.3)
put values in formula to calculate percentage,
Percentage of magnesium= (24.3/40.3) X 100
Percentage of magnesium= 60.29%.
The percent composition of magnesium in magnesium oxide is 60.29 %.
molecular mass
Molecular mass of an element is defined as the sum of the masses of the elements present in the molecule.
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Draw the final product of this series of reactions. 1. BH3 2. H2O2, NaOH 3. PBrz 4. 1 equivalent of NaOEt • Use the wedge/hash bond tools to indicate stereochemistry where it exists. • Show stereochemistry in a meso compound. • If the reaction produces a racemic mixture, draw both stereoisomers. • Draw one structure per sketcher. Add additional sketchers using the drop-down menu in the bottom right corner. • Separate multiple products using the + sign from the drop-down menu. OH compound a compound b (racemic) compound d OH compoundc compound b compound e (racemic) y. 104 z mCPBA aa. NaOH, H20 bb. Naº Reagents a. HX m. Na/NH3 HBr, H2O2, hv n. H2SO4, HgSO4 C. H2O, H2SO4 0. (sia) BH then H2O2, NaOH d. X2 p. 1 equivalent of NaNH2 e. H2, Pd q. NBS, hv f. X2, H20 r. Bre, hv g. OsO4 then NaHSO3 s. (CH3)2COK h. Hg(OAC)2, H2O then NaBH4 t. PBrz i. BH2 then H2O2, NaOH SOCI2 j. Oz then (CH3)2S H3PO4 k. 2 equivalents of NaNH2 W. H2Cro4 1. H2, Lindlar's catalyst X. PCC This synthesis was designed using the Organic Chemistry Road Map found in the appendix of your textbook. In this synthesis, reagents from the table are used to carry out the indicated steps (shown in blue). In the box below, draw the structure of compound b.
The final product of the given series of reactions is shown in the attached diagram below.
What is hydroboration?In organic chemistry, hydroboration can be described as the addition of a hydrogen-boron bond to double and triple bonds involving carbon (C=C, C=O, and C≡C).
Hydroboration forms organoborane compounds that react with a variety of reagents to form useful compounds, such as alcohols, or alkyl halides. The mostly known reaction of the organoboranes is oxidation to form alcohols by hydrogen peroxide.
Hydroboration is typically anti-Markovnikov according to which the hydrogen adds to the most substituted carbon of the alkene bond. Hydroboration proceeds through a four-membered transition state where both B and H are added on the same face of the double bond. The plane through which they are added is generated less hindered face.
After the addition of Boron, we get OH after the oxidation of BH₂ with H₂O₂. PBr₃ is used for the conversion of OH into Br and then base NaOEt will give eliminating reaction so the final product is an alkene.
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if we are heated a metal with 28g mass then we add it in a coffee cup with 28g water. the water temperature raised from 19 degree to 23.8 oc. what was the initial temperature of the metal. the water specific heat of water is 4.184 j/g oc.
Specific Heat of the metal will be = 4.184 J/C
Mass of metal = 28 g
Mass of water = 28 g
Rise in temperature = 23.8 - 19 = 4.8 C
Specific heat of water = 4.184 J/C
Let the specific heat of metal =S
The heat released by metal =mass of metal * specific heat of metal * Change in temperature
[tex]& =28\times S \times 4.8{ }^{\circ} \mathrm{C} \\& =134.4 S^{\circ} \mathrm{C}[/tex]
Heat absorbed by water = mass of water x specific heat of water x change in temp. [tex]=28 \times 4.184 \times 4.8=562.3296 J[/tex]
Using the principal of Caloriemeter:
We have, Heat released by metal = Heat absorbed by water
134.4S = 562.3296 =>4.184 J/C
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The correct question should be:
if we are heated a metal with 28g mass then we add it in a coffee cup with 28g water. the water temperature raised from 19 degree to 23.8 oc. what was the specific heat of the metal. the water specific heat of water is 4.184 j/g oc.
]
Consider the following intermediate chemical equations.
C(s) +
CO(g) +
O₂(g) → CO(g)
How will oxygen appear in the final chemical equation?
O O2(g) as a product
O O2(g) as a reactant
OO(g) as a product
O 20(g) as a reactant
O₂(g) → CO₂(g)
In the above intermediate chemical equation, oxygen will appear as follows: O₂(g) as a reactant (option B).
What is a chemical equation?A chemical equation in chemistry is a symbolic representation of a chemical reaction where reactants are represented on the left, and products on the right.
According to this question, an intermediate chemical equation is presented as follows:
CO(g) + O₂(g) → CO(g)C(s) + O₂(g) → CO₂(g)As observed in the above chemical equation, oxygen will react in its gaseous form i.e. as a reactant.
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What will be the ratio of the root mean square speeds of the molecules?
After that, the speeds of the molecules are calculated at the two different temperatures as given in the question and then, the ratio is calculated by dividing.
Here, T is the temperature,
m is the mass of the molecules and
R is the Gas constant.
Let's taken an example of the two temperatures are as follows:
[tex]T_{1}[/tex]=270K
[tex]T_{2}[/tex]=30K
We know that the root mean square speed of the molecules is given as:
[tex]V_{rms} = \sqrt{\frac{3RT}{M} }[/tex]
Putting the values of the temperatures and calculating the root mean square speeds of the molecules:
[tex]V_{rms1} = \sqrt[]{\frac{3R*270}{M} }[/tex]
[tex]V_{rms2} = \sqrt{\frac{3R*30}{M} }[/tex]
Dividing the above two root mean square speed equations in order to get the ratio of the two, we get,
⇒ [tex]\frac{V_{rms1} }{V_{rms2} } = \frac{\sqrt{\frac{3R*270}{M} } }{\sqrt{\frac{3R*30}{M} } }[/tex]
⇒ [tex]\frac{V_{rms1} }{V_{rms2} } = \sqrt{\frac{9}{1} }[/tex]
⇒ [tex]\frac{V_{rms1} }{V_{rms2} } = \frac{3}{1}[/tex]
Hence, the ratio of the root mean square speeds of the molecules of an ideal gas at 270K and 30K is 3:1.
Note: It is important to note that the root-mean-square speed is the measure of the speed of particles in a gas, defined as the square root of the average velocity-squared of the molecules in a gas. The mass and the Gas constant values for a particular gas remain the same and only temperature is the variant.
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design a synthesis of acetophenone from benzyl alcohol and methanol
To design a synthesis of acetophenone from benzyl alcohol and methanolBenzyl alcohol is converted to Benzaldehyde using PCC. Mean while methanol was converted to methyl bromide and Generated Grignard reagent.
Benzaldehyde react with Grignard reagent to give secondary alcohol which is oxidized to Acetophenone by PCC.benzaldehyde and methylmagnesium bromide are the appropriate starting material for AcetophenoneMethanol, the most basic alcohol (CH3OH), is a chemical key component in hundreds of everyday items such as plastics, paints, automobile parts, and building supplies. Methanol is also a clean energy source of information that is used to power cars, trucks, buses, ships, fuel cells, boilers, and cook stoves. . Chronic methanol vapour poisoning can cause eye inflammation (conjunctivitis), recurrent cramps, giddiness, insomnia, stomach disruptions, and visual failure.
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6. For 2NH3 equilibrium N₂ + 3H2, Kb is 6 × 104 then Kb is a.1.12 × 10^3 b. 1.67 * 10^5 1.51 × 10^-3 d. 1.67 x 10^-5
Answer:
Explanation:
The equilibrium constant (K) for the reaction 2NH3 equilibrium N₂ + 3H2 is given as 6 × 104. This value indicates the relative concentrations of the reactants and products at equilibrium.
To determine the correct option among the choices given (a, b, c, or d), we need to know the concentration units of the equilibrium constant. Without this information, it is not possible to determine which of the given options is correct.
The equilibrium constant is usually expressed in terms of the concentration of the reactants and products in the reaction. For example, if the concentration units for the equilibrium constant are mol/L, then the correct option could be one of the following:
a. 1.12 × 10^3: This option has the correct units (mol/L) but the value is incorrect.
b. 1.67 * 10^5: This option has the correct units (mol/L) but the value is incorrect.
c. 1.51 × 10^-3: This option has the correct units (mol/L) but the value is incorrect.
d. 1.67 x 10^-5: This option has the correct units (mol/L) but the value is incorrect.
Without more information about the concentration units of the equilibrium constant, it is not possible to determine which of the given options is correct.
Here Are Sketches Of Four Electron Orbitals:
Out of the sketch of the orbitals, the options are:
Electrons are in S orbital: yes.The list of electrons in an orbital is electrons B and C.Any of them in the p orbital: yes.List of the p orbital: electron D.What are orbitals?A three-dimensional representation of an electron's most likely position within an atom is called an orbital. The likelihood of discovering an electron near a hydrogen atom's nucleus is depicted in the diagram below. The 1s orbital has the highest likelihood, as you can see.
A p orbital resembles a pair of lobes on either side of the nucleus, or it has a slightly dambell-like structure. A p orbital electron has an equal chance of being in either half.
Therefore, the correct options are:
Electrons are in S orbital: yes.The list of electrons in an orbital is electrons B and C.Any of them in the p orbital: yes.List of the p orbital: electron D.To learn more about orbitals, refer to the link:
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The question is incomplete. Your most probably complete question is given below: the image is added.
What is limit and exposure?
Answer:
An exposure limit is a legal or upper or lower level used as a safety measure to prevent health and safety risks caused by excessive exposure to a poisonous or harmful chemical. Exposure limits are simply the limitations established for substances that endanger human life and/or health.
Explanation:
What is 3 oxygen called?
Answer: Ozone
Explanation:
Ozone, O3, also known as Trioxygen, is a triatomic molecule consisting of three oxygen. Ozone is the allotrope, or behavior, of oxygen that is less stable than O2.
Draw the best Lewis structure for XeI2.
In the XeI₂ Lewis structure, a xenon atom displays a xenon atom in the center, surrounded by two iodine atoms. There are two single bonds connecting the xenon atom to each iodine atom. There are three lone pairs on the xenon atom and both iodine atoms.
Lewis's structure is a pattern or diagram that describes the number of valence electrons of the atoms that will form chemical bonds. The Lewis structure is also known as the electron dot formula.
Several stages of how to write a Lewis structure:
First determine the center of the atom.Count on all the valence electrons of the atom. If the species is an ion, then add as many electrons as the ion has a negative charge or subtract the number of electrons with a positive charge.Create an electron pair for each bond.Complete the duplet or octet rule for the atoms bonded to the central atom.Add if necessary, the electron pairs on the central atom.If the atom center has not reached the octet rule, then a double bond must be formed to reach the octet rule.Learn more about Lewis's structure at https://brainly.com/question/20300458
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How many grams of solute are needed to make 3450 ml of a 2.25 M solution of Ca(NO3)2?
1.567 g of solute is needed to make 3450 ml of a 2.25 M solution of Ca(NO3)2.
How does molarity work?The amount of a substance in a specific volume of solution is known as its molarity (M). The number of moles of a solute per liter of a solution is known as molarity. The molar concentration of a solution is another name for molarity.
What does a solution's molarity mean?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 1.00 molar concentration (1.00 M) contains 1.00 moles of solute.
No. of moles of NO₃⁻ = (0.1528 mol/L) × (125.00/1000 L) = 0.0191 mol
Each mole of Ca(NO₃)₂ contains 2 moles of NO₃⁻.
No. of moles of Ca(NO₃)₂ = (0.0191 mol) × (1/2) = 0.00955 mol
Molar mass of Ca(NO₃)₂ = (40.078 + 14.007×2 + 15.999×6) g/mol = 164.086 g/mol
Mass of Ca(NO₃)₂ required = (0.00955 mol) × (164.086 g/mol) = 1.567 g
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you created a standard curve and calculated the slope to be 64.52. after synthesizing your copper network, you weighed 0.059 grams of your copper product, worked it up with nitric acid, buffer, and ammonia and added it to a 25 ml volumetric flask. then, you measured the absorbance of your solution and received a value of 0.374. what is the % mass of copper in your product?
The % mass of copper in your product will be 3.93 %.
Calculated slope = 64.52
Mass of copper product = 0.059 g
Initial volume (V1) = 25 ml
Final volume (V2) = 100 ml
Absorbance (A) = 0.374
% mass of copper = ?
To find out the concentration (C) we use the following equation
C = A / slope
Put the values
C (M2) = 0.374 / 64.52
C (M2) = 0.005797 g/L
To calculate M1 we use the following equation.
M1V1 = M2V2
M1 = 0.005797 * 100 ml / 25 ml
M1 = 0.0232 g/L
mass of copper = Penny solution x Volume
mass of copper = 0.0232 g/L x 0.1 L
mass of copper = 0.00232 g
% mass of copper = (total mass of copper ÷ mass of penny) x 100
% mass of copper = (0.00232/ 0.059 ) x 100
% mass of copper = 3.93 %
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You are given a small beaker of solution at room temp. You add a bit of solute to the solution and it dissolves. The solution was:.
Answer:
UNsaturated
Explanation:
Eventually by adding solute you will reach a point where no more will dissolve....then it is saturated
Why does a solution have a depressed freezing point and an elevated boiling point compared with the pure solvent?
Depressed freezing point because the solute changed the solvent's molecular structure, causing it to refreeze at a lower temperature. More solute supplied generates a higher boiling point because the solute interacts with the solvent, requiring more energy to bring to a boil.
What is a pure solvent?
When mating surfaces are in close contact and no gap filling is necessary, pure solvents, which have just one component, are employed to affix thermoplastics.
Depressed freezing point because the solute changed the solvent's molecular structure, causing it to refreeze at a lower temperature. More solute supplied generates a higher boiling point because the solute interacts with the solvent, requiring more energy to bring to a boil.
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A 295 g aluminum engine part at an initial temperature if 13.00 degrees Celsius absorbs 75.0 kJ of heat. What is the final temperature of the part (c of AL - 0.900 J/gK)?
Classify the following monosaccharides according to the position of the carbonyl group and the number of carbon atoms in the molecule.
The first structure is ketotetrose.
The second structure is ketohexose.
The third structure is aldohexose.
Monosaccharides are the most fundamental form of sugar and are the monomers from which all other types of carbohydrates are produced. They are also frequently referred to as simple sugars. In addition to this, they are the most basic form of sugar. The majority of the time, these compounds have a crystalline form, are white in color, and are soluble in water. Despite their common name, monosaccharides are not all sugars. Only certain monosaccharides have a flavor that can be described as sweet. The structure of the great majority of monosaccharides can be represented mathematically as CnH₂nOn. disaccharides and polysaccharides are created from monosaccharides, which are the foundational building blocks of carbohydrates. Sucrose, most commonly referred to as table sugar, is a disaccharide.
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which of the following is an example of pure chemistry? a. an analytical chemist determining the best way to filter contaminants out of drinking water b. a biochemist studying how the ribosome (a large complex of proteins) works c. an inorganic chemist developing a new alloy for use on ships that is resistant to corrosion by sea water d. an organic chemist working to synthesize a new cancer drug
a biochemist investigating the function of the massive protein complex known as the ribosome
What action might a chemical analyst take?
In industry, academia, and government, analytical chemists are used in many facets of chemical research. They conduct fundamental laboratory research, create procedures and products, create analytical instrumentation, teach, and engage in marketing and legal activities.
What are the four types of chemical analytical techniques?
Analytical chemistry is important in four main areas since it is used in many different scientific fields. These fields include chromatography, potentiometry, acid-base techniques, and spectroscopy.
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Cotton in solid but it floats on water. Why?
Is sodium bicarbonate a physical or chemical change?
When sodium bicarbonate breaks down into sodium carbonate and water this reaction comes under the category of a chemical change.
Decomposition and pH are two common chemical properties of sodium bicarbonate. The pH tells us about the number of (H+) ions present in the compounds. It helps us to identify whether a given substance is acidic , basic or neutral in nature.
A chemical change happens when a reaction takes place , whereas a physical change happens when something changes shape but not its chemical properties.
Physical changes are reversible whereas chemical changes are irreversible. Example , melting of ice is physical change whereas burning of paper is chemical change.
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W
If a chemist starts with 100 grams of Al(OH)3, how much water will be produced?
2Al(OH)3 + 3H₂ →
2AI + 6H₂O
2Al(OH)3 + 3H₂ →2AI + 6H₂O , 2 moles of Al(OH)3 give ,3 moles of H₂O. so, 100gm of Al(OH)3 gives 300 gm of H₂O.
What causes an endothermic reaction?Endothermic chemical processes are those that generally absorb (or use) energy. When bonds in the reactants are broken in endothermic reactions, more energy is absorbed than is released when new bonds are created in the products.
What does the an in n a stand for?Not applicable, (also known as N/A), is a written acronym for not applicable that is used on forms when you are unable to provide a relevant (i.e., answer the question) response. Related words and phrases are part of the SMART Vocabulary. undesirable and inappropriate. amiss.
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calculate the ph for the strong acid/strong base titration between 50.0 ml of 0.100 m hno3(aq) and 0.200 m naoh (titrant) at the listed volumes of added base: 0.00 ml, 15.0 ml, 25.0 ml, and 40.0 ml.
The pH of the strong acid /strong base for different volumes are 1.00,1.51,7,12.523.
What is pH?
Water's pH level indicates how acidic or basic it is. The range is 0 to 14, with 7 acting as a neutral value. A pH of greater than 7 denotes a base, while one of less than 7 suggests acidity. The pH scale really measures the proportion of free hydrogen and hydroxyl ions in a solution.
Using the concept of titration we can calculate pH for each volumes.
Using pW=pH+pOH
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50.0 g of sucrose (molar mass 342 g/mol) is dissolved in a total volume of 200. ml of solution. 10.0 ml of this solution is withdrawn and then diluted with water to a total volume of 50.0 ml. what is the molarity of sucrose in this final solution?
According to molar concentration, the molarity of sucrose in the final solution is 0.0584 M.
What is molar concentration?Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.
The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.
In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.
Initially the molarity of sucrose is determined as, number of moles /volume of solution in liters which is 0.146/0.2=0.0292 moles and then molarity after dilution is determined as, M₁V₁=M₂V₂, on substitution M₂=0.0292×10/50=0.0584 M.
Thus, the molarity of sucrose in this final solution is 0.0584 M.
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What is parabola give example?
Parabola is line formed from fixed points on a plane curve.
Parabola is described as a plane curve generated by a point moving so that its distance from a fixed point is equal to its distance from a fixed line and the intersection between a right circular cone and a plane parallel to an element of the cone.
The name "parabola" is given due to Apollonius, who discovered many properties of conic sections. It means "application", referring to "application of areas" concept, which has a connection with this curve, as Apollonius had proved. The focus–directrix property of the parabola and other conic sections exists due to Pappus.
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HI(aq) + H2O(l) = H3O(aq) + I-(aq) Identify each as either a: Bronsted-Lowry acid, Bronsted-Lowry base, conjugate acid, or conjugate base.
HI is the Bronsted-Lowry acid and water is the Bronsted-Lowry base, it accepts the H⁺.
According to Bronsted Lowry theory:
Acid is the one that release a proton
Base is the one that accept a proton
HF is the acid, it donates the proton to water.
Water is the base, it accepts the H⁺
HI (aq) + H₂O(l) → H₃O⁺ (aq) + I⁻ (aq
HF is the acid, it donates the proton to water.
Water is the base, it accepts the H⁺
The Bronsted Lowry theoryThe Bronsted-Lowry hypothesis, sometimes known as the proton theory of acid and base, was devised by English chemist Thomas Martin Lowry and Swedish scientist Johannes Nicolaus Bronsted.
According to the theory, when an acid and a base react, the acid trades its proton for the base's conjugate base, and the base for the acid's conjugate proton.
The Bronsted-Lowry hypothesis is an enlarged version of the Arrhenius theory of acid-base.
The Arrhenius theory states that while base increases the concentration of OH- ions in an aqueous solution, acid increases the concentration of H+ ions.
The Arrhenius hypothesis' disadvantage is that it can only be used to identify an acid-base interaction in an aqueous medium.
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Why is there chemical bonding at all?
The simplest response is that atoms are attempting to enter the most stable (lowest-energy) state possible. When an atom meets the octet rule or forms chemical bonds, many of them become stable.
What exactly is chemical bonding used for?The attraction between two or more atoms that enables them to combine to produce a stable chemical compound is known as chemical bonding. Chemical bonds can have many different types, but covalent and ionic bonds are the most well-known. When one atom has less energy, the other has enough thanks to these bonds.
What are responsible for chemical bonding?The valence electrons are the ones in charge of forming chemical bonds. Atoms trade electrons to form chemical bonds. Ionic and covalent bonds are the two basic types of bonding. When two atoms with different electronegativity join together, ionic connections are formed.
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Is Li and Cl likely to form ionic compounds?
Answer:
Well lithium is a metal and chlorine is a nonmetal. Therefore this is most likely going to be ionic
What is the process of enzymes called?
The process of enzymes is called enzymatic action and the in terms of body it is known as digestion.
The response then occurs, changing the substrate into merchandise and forming an enzyme merchandise complicated. The merchandise then go away the energetic site of the enzyme. The first step of an enzyme catalyzed response is catalytic turnover the binding of substrate via way of means of the enzyme the discharge of product dissociation of the ES complicated ES -> E + P. An enzyme-catalyzed response may be more or less divided into 3 stages: enzyme-substrate binding, "catalysis" and product release.
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What are the 4 common elements that form covalent bonds?
Answer:
The four (4) most important elements found in cells that form covalent bonds are carbon, hydrogen, oxygen and nitrogen.
Explanation:
In our chem lab. We have to do something called the chem 21. This weeks topic was about solving ten test tube mystery and basically we were using a plate to mix it by one chemical to one chemical.We discovered thatA=KlB=Na2sC=NH4ClD=HClE=AgNo3F=BaCl2G=H2SO4H=NaBrI=NaOHJ=CuSO4However, we have to explain why and write the net ionic equation?
our chemistry lab. The chem 21 is a requirement for us. Basically, we were using a plate to chem lab it by one chemical to one.
Your Instructor has defined tolerances, which the Chem21 computer uses to score your response. This week's theme was about solving ten test tube mysteries. You will be informed on the website whether you are required to round your response chem lab to the correct number of Significant Figures; otherwise, you need just enter a number that lies between the correct amount minus
Here are some Chemistry Practical Class 12 experiments that will help students effectively prepare for their exams. I Making potash alum or ferrous ammonium sulphate double salt. Identifying a cation and an anion in a.
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What are the 4 routes of chemical exposure?
There are four primary routes through which a chemical may enter the body:breathing (inhalation) (breathing)Contact with the skin or the eyes swallowing and injecting
How many different ways are there to be exposed to chemicals?Chemicals must reach your body in order to harm your health.The three basic "routes of exposure," or methods by which a chemical enters your body, are as follows.BREATHING
What are the three exposure routes?The method via which a person may come into touch with a dangerous material is referred to as an exposure pathway.There are three primary exposure routes: direct touch, ingestion, and inhalation.Measuring the quantity of the dangerous material just at point of contact allows for the determination of the degree and extent of exposure.
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