Answer:
the correct answer is 5
Explanation:
i just know
Describe the effect on the following. During your titration of Zinc Chloride lab, you discovered that the burette you used delivered less volume than the recorded volume of Zn2+ solution used in titration. Predict how your results would differ compared to the true values for:
a. Number of moles of zinc.
b. Number of moles of chloride.
c. Empirical formula.
The no. of moles and mass of zn determines to be in the titration sample of zinc chloride be less than the original value. correct option is (A).
Percentage error = (experimental value / theoretical value) * 100
So experimental value is always less than that of the theoretical value
b. Higher mole of Cl than the true value
A smaller volume would lead to a smaller mol amount of Cl being calculated. Thus higher than the true value volume recording.
c. The ratio of zinc to chloride would decrease.
A higher number of Cl moles would lead to higher whole number when divided by the number of Zn moles. Thus, the ratio would have a larger denominator equals smaller ratio.
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c. units of volume to units of
length.
d. units of length to units of
volume.
13.A student determined the density of
aluminum by averaging the
results of three density
calculations. Each value was
different, but the average was
equal to the accepted value for
aluminum's density. The results
of this investigation are best
described as
a. accurate, but not precise.
b. precise, but not accurate.
c. both precise and accurate.
d. neither precise nor accurate.
14. Neutral atoms contain equal numbers
of
a. electrons and neutrons.
b. protons and neutrons.
c. protons and electrons.
d. protons, electrons, and
neutrons.
15. An atom of potassium has 19 protons
and 20 neutrons. Its mass
number is
a. 9.
b. 19.
c. 20.
d. 39.
16. The isotope uranium-235 has 92
protons and 143 neutrons.
Therefore, its mass number
a. 92.
b. 235.
c. 143.
d. impossible to determine.
13.A student determined the density of aluminum by taking average of the results of three density calculations. Each value was different, but average was equal to the accepted value for density of aluminum. The results of investigation are described as a.) accurate, but not precise.
What is mass number?
The total number of protons and neutrons in an atom is known as the mass number. It is calculated by adding the number of neutrons and the number of protons together .
14.Neutral atoms contain equal numbers of c.) protons and electrons.
15. An atom of potassium has 19 protons and 20 neutrons. Its mass number is d.) 39. As we know that, mass number = Number of protons + number of neutrons. Hence, 19 + 20 = 39
16.The isotope uranium-235 has 92 protons and 143 neutrons. Therefore, its mass number b.) 235.
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Cosmic background radiation is:
O High energy radiation from black holes.
O Leftover radiation from the big bang.
O The part of the electromagnetic spectrum after ultraviolet.
O Radiation that can cause sunburns.
Cosmic background radiation is Leftover radiation from the big bang.
What is Cosmic radiation?
When primary photons and particles from outside of the solar system interact with elements of the earth's atmosphere, cosmic radiation, an ionising radiation, is created. The sun's discharge of charged particles, also known as solar flares or "sun storms," is a secondary source of cosmic radiation. The environment in which we live naturally contains ionising radiation, which can be found in the soil, structures, food we eat, and even the bones in our bodies.
Nonionizing radiation, which also includes UV light, radio waves, as well as microwaves, is the other type. Natural radiation has been present in the environment where humans, animals, as well as plants have all evolved, and, with very few exceptions, it poses little danger to human health.
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. by now you should realize that having an octet of electrons on a central atom is critical for a molecule to be stable. would you expect no and no2 to be stable molecules? why or why not? include lewis structures as part of your explanation. type your answer in the entry below, then use the photo icon to attach a photo of your drawn lewis structures.
No, I would not expect NO and NO2 to be stable molecules. This is because, in both the molecules, N has an incomplete octet. It has only 7 electrons in its outermost shell in both the molecules.
The primary exception to the Octet Rule is when there is a strange range of valence electrons. An instance of this will be Nitrogen (II) Oxide also called nitric oxide (NO. Nitrogen has five valence electrons whilst Oxygen has 6.
There are 3 trendy exceptions to the octet rule: Molecules, including NO, with an extraordinary range of electrons; Molecules wherein one or greater atoms own more than eight electrons, consisting of SF6; and. Molecules inclusive of BCl3, wherein one or extra atoms possess much less than 8 electrons.
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A scuba diver's tank contains 1.47 moles of O₂ and 5.53 moles of He at the end of a dive. If the pressure of the gas mixture is 12.1 atm, what is the partial pressure of
He in the tank?
O A 2.19 atm
B
2.54 atm
Oc9.56 atm
OD 15.3 atm
A scuba diver's tank contains 1.47 moles of O₂ and 5.53 moles of He at the end of a dive. If the pressure of the gas mixture is 12.1 atm, the partial pressure of He in the tank is 9.56 atm.
given that :
moles of O₂ = 1.47 mol
moles of He = 5.53 mol
Total mole = 1.47 + 5.53 = 7 mol
mole fraction of He = mole of He / total moles
= 5.53 / 7
= 0.79 mol
Total pressure of gas mixture = 12.1 atm
partial pressure of He = mole fraction of He × total pressure
= 0.79 × 12.1
= 9.56 atm
Thus, A scuba diver's tank contains 1.47 moles of O₂ and 5.53 moles of He at the end of a dive. If the pressure of the gas mixture is 12.1 atm, the partial pressure of He in the tank is 9.56 atm.
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A boat that was sailing at 420 meters per minute passed near a humpback whale. The whale had taken 2.5 minutes to swim 230 meters south at a constant velocity. What was the whale's velocity?
PLSS help!!!
The velocity of the whale is equal to 1.53 m/s.
What is the velocity?Velocity can be defined as a vector measurement of the direction and position of an object. The velocity can be defined as the rate of change in the position w.r.t. time.
Velocity is a vector parameter as it possesses both magnitude and direction. A mathematical formula to determine velocity:
v = d / t
Where v is the velocity, d is the distance, and t is the time of an object.
The S.I. unit for velocity is meters per second (m/s) and can also express in miles/hour (mph), and kilometers/hour (kph).
Given the distance swum by the whale, d= 230 m
The time is taken by the whale, t = 2.5 min = 150 sec
The velocity of the whale = d/t = 230/150 = 1.53 m/s
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The element radium has a mass number of 226 and an atomic number of 88. How many neutrons does an atom of radium have?.
Considering the definitions of atomic number and mass number, a radium atom has 138 neutrons.
First, an atom is defined as the smallest particle that can break down an element without losing the chemical properties that characterize it.
It consists of a positively charged central part, where almost all mass is concentrated to form the nucleus, and a certain number of negatively charged particles, electrons, which form the crust.
Atomic number, on the other hand, is denoted by the letter Z and indicates the total number of protons in the nucleus of a particular atom.
Finally, mass number is denoted by the letter A and indicates the sum of the number of protons and neutrons in the nucleus. The number of protons equals the atomic number,
In this case, the element radium has a mass number of 226 and an atomic number of 88.
so the mass number is
Mass number = (number of atoms) + (number of neutrons)
226= 88 + number of neutrons
226 - 88 = number of neutrons
138 = number of neutrons
therefore, a radium atom has 138 neutrons.
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what was significant about the atomic theory that democritus proposed?
He proposed that matter, when small enough, reaches a point where it can no longer be divided and becomes atoms, meaning "individual".
Democritus believed that atoms were uniform, solid, hard, incompressible, and indestructible, and that they moved in infinite numbers through empty space until they stopped. In the philosophy of Democritus, atoms existed not only for matter, but also for such properties as perception and the human soul.
Democritus developed his atomic philosophy as a middle ground between the two opposing Greek theories of reality and the illusion of change. He argued that matter is divided into indivisible and immutable particles that create the appearance of change when they combine and separate from each other.
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two gases are placed at either end of a tube at room temperature as shown; when they meet a white/yellow precipitate will form. where in the tube do you predict to see the precipitate?
The precipitate usually forms nearer to the hydrochloric acid end of the tube because hydrogen chloride diffuses more slowly than ammonia.
This is because hydrogen chloride has almost twice the molecular weight of ammonia, and the rate of diffusion is inversely proportional to the square root of the molecular mass of the gas.
What happens when HCl reacts with ammonia?
Ammonia gas reacts with hydrogen chloride gas to produce ammonium chloride.
It is an acidic salt. Ammonium chloride is a weak base whereas HCl is a strong acid. When a weak base reacts with a strong acid, the base is unable to fully neutralize the acid.
What is observed when ammonia is tested with concentrated HCl?
When a glass rod dipped in hydrochloric acid is brought near a jar filled with ammonia, dense yellow fumes are observed.
Thus, when ammonia and HCL meet a yellow/white precipitate is formed neared to the hydrochloric acid end of the tube.
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classify the following as an electrolyte or non-electrolyte: calcium chloride solution (an ionic compound)
Calcium chloride solution is a electrolyte solution.
An electrolyte solution is a solution that generally contains ions, atoms or molecules that have been lost or gained electrons during the reaction, and is electrically conductive. Because of this they are often called ionic solutions, however there are some cases where the electrolytes are not ions.
A non-electrolyte is a solute that does not dissociate, or which does not furnishes ions during the dissolving process. Therefore, solutions that are generated through the solvation of non-electrolytes do not contain ions and, instead they are called as neutral molecules.
In case of calcium chloride it is a electrolyte solution because when it dissociates it generated Ca2+ and Cl- ions, which gives a ionic solution. Hence it is a electrolyte.
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Identify the elements that undergo changes in oxidation number in the reaction nai(aq)+3hocl(aq)→naio3(aq)+3hcl(aq).
The following changes in oxidation number in the reaction.
NaI (aq) + 3HOCl (aq) → NaIO₃ (aq) + 3HCl (aq)
The iodine elements is going under oxidation in the given reaction that is from -1 to +5.
A loss of negatively charged electrons corresponds to an increase in oxidation number, while a gain of electrons corresponds to a decrease in oxidation number.
Therefore, the element or ion that is oxidized undergoes an increase in oxidation number.
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explain how to calculate an rf value and what that information can tell you about the success of your reaction. was your guaifenesin synthesis successful?
It is the ratio of the distance traveled by a compound in a mobile phase compared with the distance traveled by the front of the mobile phase itself
What is Rf Value?
Rf value is the ratio of the solute's distance travelled to the solvent's distance travelled.Rf = migration distance of substance / migration distance of solvent front
The word comes from chromatography when it was discovered that a given component will always travel the same distance in a given solvent under same conditionsIf we get 1 Rf value, it means the reaction is successful.But if we get 2 or more Rf values, then it means there is some impurity or side products or maybe some reactants are present in the final product.Learn more about chromatography at - https://brainly.com/question/16941051
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A scuba diver's tank contains 1. 47 moles of o2 and 5. 53 moles of he at the end of a dive. If the pressure of the gas mixture is 12. 1 atm, what is the partial pressure of he in the tank?.
The partial pressure of helium, He in the tank, given that the tank contains 1.47 mole of O₂ and 5.53 moles of He, is 9.559 atm
How do I determine the partial pressure of He?To calculate the partial pressure of He in the tank, we must first obtain the mole fraction of He. Details on how to obtain the mole fraction of He is shown below:
Mole of O₂ = 1.47 mole Mole of He = 5.53 moles Total mole = 1.47 + 5.53 = 7 molesMole fraction of He =?Mole fraction of He = Mole of He / total mole
Mole fraction of He = 5.53 / 7
Mole fraction of He = 0.79
Now, we can obtain the partial pressure of He. This is illustrated below:
Mole fraction of He = 0.79Total pressure in tank = 12.1 atmPartial pressure of He in tank =?Partial pressure = mole fraction × total pressure
Partial pressure of He = 0.79 × 12.1
Partial pressure of He = 9.559 atm
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Which statement regarding free radicals is FALSE?
a. Free radicals donate electrons to unstable compounds.
b. Free radicals contain an unpaired electron.
c. Free radicals can be neutralized by antioxidants.
d. Free radicals steal electrons from phospholipids found in cell membranes.
Option-a. is false.As a free redical is unstable they steal the electrons from other compound.
A radical is said to be free radical if atom molecule or ion that has atleast one unpaired valence electrons. This radicals are highly reactive. The presence of an unpaired electron results common properties that shared by most of the radicals. Many radicals are unstable and highly reactive. They can donate an electron to other molecules or accept an electron from other molecules. Free radicals can be neutralized by antioxidants to protect the cell against the toxicity. It can nutralize free radical by giving the extra electro needed to make tge pair. or by breaking down the free radicals.Free radicals can steal electrons from phopholipids found in the cell membrane.
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Test yourself
Using Tables 2.1 and 2.2, pick the 'odd one out' in
the following group and explain why it is different
from the others.
zinc
copper
oxygen
lead
2 Using Tables 2.1 and 2.2, pick the 'odd one out' in
the following group and explain why it is different
from the others.
carbon
nitrogen
iron
sulfur
Jsing Tables 2.1 and 2.2, pick the 'odd one out' in
the following group of properties of metals and
explain why it is different from the others.
Zinc
copper
Oxygen
Lead
high melting point
high density
soft or brittle
good electrical conductivity
The separation compound using diffrence in boiling point melting point like physical properties.
What is physical properties?
A physical property is the any measurable property that whose value describes the state of a physical in system. Changes in the system's physical properties of can be used to describe its transitions between the momentary of state.
A physical property is a characteristic of the matter that is not associated with in a change in its chemicals composition. Familiar to the examples of physical properties that is include density, color, hardness, melting and boiling points, and the electrical conductivity.
There are mainly two types of physical property extensive and intensive.
Sol-The separation scheme to used to separate the mixture of based on differences in this physical properties- such as boiling point, melting point, solubility in a given solvent these are the three components.
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What effect would cyanide have on the electron transport chain and the production of atp.
Cyanide binds to the electron transport chain and prevents electron transfer to oxygen, preventing NADH from being converted to NAD+. This would imply that no ATP was also produced.
What is Cyanide?
Cyanide is a potentially lethal chemical that can exist in a variety of forms.
Cyanide can exist in the form of a colourless gas, such as hydrogen cyanide (HCN) or cyanogen chloride (CNCl), or as a crystal, such as sodium cyanide (NaCN) or potassium cyanide (KCN).
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What is Electron?
An electron is a negatively charged subatomic particle that can be bound to or free from an atom (not bound). A bound electron is one of the three primary types of particles within an atom, the other two being protons and neutrons.
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Carbon films are a result of gases
evaporating and what being left behind?
in the following pair of compounds one is chiral and the other is achiral. identify each compound as chiral or achiral, as appropriate. h57196a the first compound is (select) and the second compound is (select) .
Among the given pair of compounds, compound (I) is achiral and compound (II) is chiral.
A molecule is referred to as achiral if it has a plane of symmetry or a center of symmetry. A molecule is referred to as chiral if it lacks a plane of symmetry or a center of symmetry. Compound (I) is achiral because it possesses a plane of symmetry due to the presence of both OH groups at equatorial positions, which means they are on the same side of the cyclohexane ring. In compound (II) both OH groups are on the opposing side of the cyclohexane ring, there is neither a plane of symmetry nor a center of inversion so, it is chiral.
The question is incomplete. The complete question is attached as an image.
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All about Chemical kinetics
Answer:
CHEMICAL KINETICS can also be called as REACTION KINETICS.
CHEMICAL KINETICS is one of the branches of physical chemistry.
Explanation:
CHEMICAL KINETICS describes the speed of chemical species where they transform in new substances by breaking down. After breaking down they form molecular bonds.
Study of a chemical reaction can be stated as CHEMICAL KINETICS.
CHEMICAL KINETICS can be used in real life.
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write structures and give systematic names for all alkynes with molecular formula c5h8. 17) name (ch3)2c(ch2ch3)c cch(ch3)2. 18) name brch2ch2c cch2ch3. 19) name the following compound:
The possible alkynes with molecular formula C5H8 is 3.
C5H8 is Isoprene. The chemical name is Pentyne. This formula can also represent a monovalent functional group derived from any hydrocarbon having the formula C5H9 by removal of a hydrogen atom. or divalent radicals derived from C5H10 minus two hydrogen atoms;
The 3 alkynes are 1-Pentyne, 2-Pentyne, 3-Methyl-1-butyne or isopentyne.
Name of (ch3)2c(ch2ch3)ccch(ch3)2 is 5-ethyle-2,5-dimethyl-3-hexyne.
Name of brch2ch2c cch2ch3 is 1-bromohex-3-yne.
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A saturated solution of lead (ii) nitrate was made at 500c using 100g of water and then allowed to cool to 300c. What would happen to the solution as the temperature is decreased?.
The temperature of the solution decreases with the precipitation of solid lead nitrate in the solution.
Therefore, when a saturated solution of lead nitrate prepared at 50°C is cooled to 30°C solid lead nitrate is observed to segregate into the solution. This means that as the temperature decreases, so does the solubility of lead nitrate. The solubility of substances is directly affected by the temperature of the solvent.
The average kinetic energy of the molecules that make up the solution increases as the temperature of the solution increases. The increased kinetic energy allows solvent molecules to break down solute molecules bound by intermolecular interactions. A dissolution process is endothermic if the energy released when a water molecule bonds with a solute are less than the energy used to pull the solute apart.
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How did Wegener use the shapes of the continents as evidence that the continents had moved?
Wegener use fossils evidence to the shapes of the continents as evidence that the continents had moved.
Chemical fossils are substances that may be discovered in rocks and serve as an organic record of prehistoric life. Chemical fossils can be divided into two categories: molecular fossils and isotope ratios. Molecular fossils are products of biological biosynthesis that are absorbed into sediments and subsequently into rock. They are also known as biomarkers or biosignatures.
Numerous of these molecules undergo well-known modifications and can remain stable for billions of years. Chemical fossils are found in fossil fuels such as petroleum (crude oil), coal, and natural gas, which are products of biological activity. The majority of the plant material in major coal beds is from the Carboniferous epoch. Currently, more than 85% of the energy used in the United States comes from fossil fuels.
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Use principles of molecular structure, intermolecular forces, and kinetic molecular theory to answer the following questions.
a. A complete Lewis electron-dot diagram of a molecule of ethyl methanoate is given below
i. Identify the hybridization of the valence electrons of the carbon
atom labeled Cw.
ii. Estimate the numerical value of the Hy – Cx – O bond angle in the
ethyl methanoate molecule. Explain the basis of your estimate.
In the attached Lewis electron-dot diagram of a molecule of ethyl methanoate, the hybridization of the valence electrons of the carbon atom labeled Cw is sp² hybridization.
The numerical value of the Hy-Cx-O bond angle is 109.5°
i. As we can see in the structure attached, the Cw carbon is making a double bond with oxygen. So it is an sp² hybridized carbon, the one unhybridized p orbital of Cw makes pi with the p orbital of oxygen.
ii. The numerical value of the Hy-Cx-O bond angle is 109.5°. As we can see the Cx is singly bonded with the oxygen and have sp³ hybridization, so the bond angle will be 109.5°.
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Which molecules are types of proteins?
A) Enzymes
B) Triglycerides
C) Dissachariads
D) DNA and RNA
Answer:
la respuesta es la a)
Explanation:
los enzimas son tipos de moléculas
How many grams of nitrogen, N2, are in a 5.00-liter container when the gas is under a pressure of 2.00 atmosphères at 50.0 °C?
Grams of nitrogen, N₂, are in a 5.00-liter container when the gas is under a pressure of 2.00 atmospheres at 50.0 °C is 5.640g
Gram is the unit of mass or weight that is used especially in the centimeter gram second system of measurement
Here given data is
Volume = 5.00-liter
Pressure = 2.00
Temprature = 50.0 °C = 50.0+273 = 323K
We have to calculate grams of nitrogen = ?
So, PV =nRT
PV = m/MRT
M = Molar mass of nitrogen gas = 28 g/mol
R = gas constant 62.3637LmmHgmol⁻¹K⁻¹
Then putting this value
PV = m/MRT
2.00×5.00 = m/28 × 62.3637 × 323K
10 = m/564.01
m = 5.640g
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According to the beer-lambert law, what happens to the absorbance value of a light-absorbing chemical when its concentration increases?.
The absorbance is directly proportional to the concentration (c) of the solution of the sample used in the experiment.
What is beer-lambert law ?
The Beer-Lambert law is commonly used to measure sample absorbance and transmittance and can be used to determine sample concentration. In absorbance measurements, light passes through a cuvette filled with sample. Compare the light intensity after passing through the cuvette to the light before passing through the cuvette. The cuvette size determines the optical path length (L). (A cuvette is a special glass device.) The wider the cuvette, the more light of the sample is transmitted, and the less light is transmitted. This explains why the formula depends on the path length (L).
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please help first answer will Brainliest
Which of these is an example of a physical change?
O sugar dissolving in warm water
O iron rusting in the presence of moist air
O wood burning in the presence of oxygen
O baking soda reacting with acid to form a gas
Answer: iron rusting and wood burning
Explanation: both can be considered physically changes
1. A 3. 88 mol sample of gas has a temperature of 28°c and a pressure of 885 torr. What is its volume?.
A 3. 88 mol sample of gas has a temperature of 28 °C and a pressure of 885 torr. its volume is 82.5 L.
Given that :
mole = 3.88 mol
temperature = 28 °C = 301 K
pressure = 885 torr = 1.16 atm
volume = ?
using the ideal gas equation , we get
P V = n R T
V = ( n RT) / P
V = (3.88 × 0.082 × 301 ) / 1.16
V = 82.5 L
Thus, A 3. 88 mol sample of gas has a temperature of 28 °C and a pressure of 885 torr. its volume is 82.5 L.
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what are two options for acetyl-coa once it has been produced?
a) Acetyl-Coa combines with oxaloacetates in the citric acid cycle
b) forming ketones
Numerous processes, including the catabolism of certain amino acids and the oxidative decarboxylation of pyruvate, produce acetyl-CoA in mitochondria. The pyruvate dehydrogenase complex in the mitochondria and plastids converts pyruvate to acetyl-CoA while also reducing NAD+ to give acetyl-CoA for fatty acid production. The very active acetyl-CoA synthetase found in chloroplasts, on the other hand, can convert acetate to acetyl-CoA following the consumption of ATP. Acetate may be produced from the previous hydrolysis of mitochondrial acetyl-CoA, which is produced there by the oxidation of pyruvate by the mitochondrial pyruvate dehydrogenase complex and is a significant precursor for the synthesis of acetyl-CoA in chloroplasts and leucoplasts in many plants. As a result, fatty acids quickly absorb radioactivity when chloroplasts are given radioactively labeled acetate.
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calculate the standard enthalpy of reaction for the reaction: 2SO2(g) + O2(g) --> 2SO3(g).
A). Write the needed standard enthalpy of formation equations.
B). Manipulate these equations and calculate the enthalpy of reaction.
The enthalpy of reaction can be obtained from;
ΔHf [tex]SO_{3}[/tex] - (ΔHf [tex]SO_{2}[/tex] + ΔHf [tex]O_{2}[/tex])
What is the enthalpy of formation?The enthalpy of formation has to do with heat that is evolved or absorbed when an object is formed from its constituents under standard conditions. In this case, we want to be able to obtain the enthalpies of formation of each of the substances in the reaction.
For [tex]SO_{2}[/tex]
[tex]S(s) + O_{2} (g) ------- > SO_{2} (g)[/tex]
For [tex]O_{2}[/tex]
[tex]O(g) + O(g) ----- > O_{2} (g)[/tex]
For [tex]SO_{3}[/tex]
[tex]SO_{2} (g) + \frac{1}{2} O_{2} (g) ----- > SO_{3} (g)[/tex]
Then if we now want to obtain the enthalpy of reaction, we know that we can be able to get it from;
Sum of formation enthalpy of the products - Sum of formation enthalpy of the reactants.
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