Question 1

Question

A)Two samples of solids have similar reactivity with acids and similar densities. Their masses and volumes, however are not at all similar. Is it possible that these are the same substance?(1 point)
Responses

No, it is not possible because they have different extensive properties.
No, it is not possible because they have different extensive properties.

No, it is not possible because they have different intensive properties.
No, it is not possible because they have different intensive properties.

Yes, it is possible because they have similar extensive properties.
Yes, it is possible because they have similar extensive properties.

Yes, it is possible because they have similar intensive properties.
Yes, it is possible because they have similar intensive properties.
Question 2
A)Melting gold with other metals makes 20-karat gold. Which term best describes 10-karat gold?(1 point)
Responses

homogeneous mixture
homogeneous mixture

compound
compound

pure substance
pure substance

heterogeneous mixture
heterogeneous mixture
Question 3
A)How do chemists predict the shapes of molecules?(1 point)
Responses

Due to the repulsion between electrons, valence electrons will be arranged as far apart from each other as possible.
Due to the repulsion between electrons, valence electrons will be arranged as far apart from each other as possible.

Chemists can't predict the shape of molecules, because the attractive forces between valence electrons are unpredictable.
Chemists can't predict the shape of molecules, because the attractive forces between valence electrons are unpredictable.

Due to the attraction between electrons, valence electrons will be arranged as close to each other as possible.
Due to the attraction between electrons, valence electrons will be arranged as close to each other as possible.

Due to the repulsion between electrons, valence electrons will be arranged as close to each other as possible.
Due to the repulsion between electrons, valence electrons will be arranged as close to each other as possible.
Question 4
A)Lead has an atomic number of 82. Which statement describes all neutral atoms and ions of lead?(1 point)
Responses

Neutral atoms of lead must have 82 protons, but ions can have more or fewer.
Neutral atoms of lead must have 82 protons, but ions can have more or fewer.

Neutral atoms of lead must have 82 neutrons, but ions can have more or fewer.
Neutral atoms of lead must have 82 neutrons, but ions can have more or fewer.

Neutral atoms of lead must have 82 electrons. Ions must have 82 electrons, as well.
Neutral atoms of lead must have 82 electrons. Ions must have 82 electrons, as well.

Neutral atoms of lead must have 82 protons. Ions must have 82 protons, as well.
Neutral atoms of lead must have 82 protons. Ions must have 82 protons, as well.
Question 5
A)How did the study of the atom contribute to our understanding of the periodic table of the elements?(1 point)
Responses

The determination of electron charge led to an understanding of how atoms interact with one another, which facilitated the organization of the periodic table.
The determination of electron charge led to an understanding of how atoms interact with one another, which facilitated the organization of the periodic table.

Elements are made of atoms, so understanding atoms provided information about elements, which led to the organization of the periodic table.
Elements are made of atoms, so understanding atoms provided information about elements, which led to the organization of the periodic table.

Atoms are representative of elements, so scientists scaled up atomic characteristics to understand elemental characteristics, allowing scientists to arrange elements in a periodic table.
Atoms are representative of elements, so scientists scaled up atomic characteristics to understand elemental characteristics, allowing scientists to arrange elements in a periodic table.

Experiments that identified characteristics of atoms provided scientists with atomic weights and atomic numbers, which are used to organize the periodic table.
Experiments that identified characteristics of atoms provided scientists with atomic weights and atomic numbers, which are used to organize the periodic table.
Question 6
A)Hydrogen is in Group 1 of the periodic table. Which kind of bond would form between two hydrogens?(1 point)
Responses

A metallic bond would form because both atoms are metals.
A metallic bond would form because both atoms are metals.

A covalent bond would form because the electron would be shared so both hydrogens have a full, stable shell.
A covalent bond would form because the electron would be shared so both hydrogens have a full, stable shell.

An ionic bond would form because one hydrogen would transfer its valence electron to the other hydrogen to make a full shell.
An ionic bond would form because one hydrogen would transfer its valence electron to the other hydrogen to make a full shell.

An ionic bond would form because both atoms are nonmetals.
An ionic bond would form because both atoms are nonmetals.
Question 7
A)
Use the periodic table to answer the question.

Which of the following elements are most likely to form an ionic bond?

(1 point)
Responses

Se and Cl
Se and Cl

K and Ca
K and Ca

C and O
C and O

Na and Cl
Na and Cl
Question 8
A)Which example accurately describes a solution?(1 point)
Responses

Nonpolar oil molecules dissolve in water, which is polar.
Nonpolar oil molecules dissolve in water, which is polar.

Polar sugar molecules dissolve in water, which is polar.
Polar sugar molecules dissolve in water, which is polar.

Polar sugar molecules dissolve in oil, which is nonpolar.
Polar sugar molecules dissolve in oil, which is nonpolar.

Nonpolar fat molecules dissolve in water, which is polar.
Nonpolar fat molecules dissolve in water, which is polar.
Question 9
A)How do temperature changes lead to solubility changes for salt dissolved in water?(1 point)
Responses

High temperatures mean more of the salt will be in the liquid form as it gradually melts, increasing solubility.
High temperatures mean more of the salt will be in the liquid form as it gradually melts, increasing solubility.

High temperatures mean more of the salt will be in the gas form, causing it to evaporate out of the solution, decreasing solubility.
High temperatures mean more of the salt will be in the gas form, causing it to evaporate out of the solution, decreasing solubility.

High temperatures mean that sodium and chlorine ions will be moving faster, increasing the odds that they will collide and combine. This reduces solubility.
High temperatures mean that sodium and chlorine ions will be moving faster, increasing the odds that they will collide and combine. This reduces solubility.

High temperatures mean more kinetic energy, which keeps sodium and chlorine ions from combining, which increases solubility.
High temperatures mean more kinetic energy, which keeps sodium and chlorine ions from combining, which increases solubility.
Question 10
A)Which statement best describes a weak base?(1 point)
Responses

It donates protons and completely dissociates in water.
It donates protons and completely dissociates in water.

It accepts protons and completely dissociates in water.
It accepts protons and completely dissociates in water.

It accepts protons and only partially dissociates in water.
It accepts protons and only partially dissociates in water.

It donates protons and only partially dissociates in water.
It donates protons and only partially dissociates in water.
Question 11
A)
Use the periodic table to answer the question.



Which comparison is correct?

(1 point)
Responses

HF
is a stronger acid than HCl
.
cap h cap f is a stronger acid than cap h cap c l.

PH3
is a stronger acid than NH3
.
cap p cap h sub 3 is a stronger acid than cap n cap h sub 3.

NH3
is a stronger acid than HF
.
cap n cap h sub 3 is a stronger acid than cap h cap f.

H2S
is a stronger acid than HCl
cap h sub 2 cap s is a stronger acid than cap h cap c l
Question 12
A)In an experiment involving a balloon, a scientist notices that the gas particles within the balloon begin to move faster, resulting in the balloon expanding. Which statement best describes the experiment?(1 point)
Responses

The scientist is investigating Charles's law which shows that temperature and volume are directly proportional.
The scientist is investigating Charles's law which shows that temperature and volume are directly proportional.

The scientist is investigating Boyle's law, which shows that pressure and volume are inversely proportional.
The scientist is investigating Boyle's law, which shows that pressure and volume are inversely proportional.

The scientist is investigating Boyle's law, which shows that pressure and volume are directly proportional.
The scientist is investigating Boyle's law, which shows that pressure and volume are directly proportional.

The scientist is investigating Charles's law, which shows that temperature and volume are inversely proportional.
The scientist is investigating Charles's law, which shows that temperature and volume are inversely proportional.
Question 13
A)
Use the periodic table to answer the question.



How is an atom of the Potassium (K) likely to act during a chemical reaction?

(1 point)
Responses

It will likely be unreactive.
It will likely be unreactive.

It will likely gain electrons.
It will likely gain electrons.

It will likely share electrons.
It will likely share electrons.

It will likely lose electrons.
It will likely lose electrons.
Question 14
A)
Under certain conditions, water can be separated into oxygen and hydrogen gases according to the equation: 2H2O → 2H2 + O2
.

In a lab, 96g of hydrogen gas and 404g of oxygen gas were collected. Student A says that the starting amount of water cannot be determined, but Student B says that the water must have been 500g. Who is correct?

(1 point)
Responses

Neither are correct. It was 2000g because the equation shows 2H2O
.
Neither are correct. It was 2000g because the equation shows 2 cap h sub 2 cap o.

Neither are correct. It would have been 1112g, because there are 2 H2
and 1 O2
.
Neither are correct. It would have been 1112g, because there are 2 H2
and 1 O2
.

Student B, because the law of conservation of matter.
Student B, because the law of conservation of matter.

Student A, because the water was not measured to start with.
Student A, because the water was not measured to start with.
Question 15
A)Molecules that are made up of two of the same atom have nonpolar covalent bonds. Which statement best explains this property?(1 point)
Responses

The atoms have the same number of valence electrons.
The atoms have the same number of valence electrons.

No electrons are shared between the atoms.
No electrons are shared between the atoms.

One of the atoms transfers electrons to the other atom.
One of the atoms transfers electrons to the other atom.

The atoms have the same electronegativity.

Answer 1

Here are the answers to your questions:

Question 1 A) No, it is not possible because they have different extensive properties.

Question 2 A) homogeneous mixture.

Question 3 A) Due to the repulsion between electrons, valence electrons will be arranged as far apart from each other as possible.

Question 4 A) Neutral atoms of lead must have 82 protons. Ions must have 82 protons, as well.

Question 5 A) Elements are made of atoms, so understanding atoms provided information about elements, which led to the organization of the periodic table.

Question 6 A) A covalent bond would form because the electron would be shared so both hydrogens have a full, stable shell.

Question 7 A) Na and Cl.

Question 8 A) Polar sugar molecules dissolve in water, which is polar.

Question 9 A) High temperatures mean that sodium and chlorine ions will be moving faster, increasing the odds that they will collide and combine. This reduces solubility. (This response is incorrect; increasing temperature typically increases solubility, so it seems the best correct choice is not accurately represented.)

Question 10 A) It donates protons and only partially dissociates in water.

Question 11 A) HF is a stronger acid than HCl.

Question 12 A) The scientist is investigating Charles's law which shows that temperature and volume are directly proportional.

Question 13 A) It will likely lose electrons.

Question 14 A) Student B, because the law of conservation of matter. (The correct starting amount of water can be determined by adding the mass of gases produced, so it totals 500g accurately according to the law.)

Question 15 A) The atoms have the same electronegativity.

If you have any further questions or need additional explanations on any of these topics, feel free to ask!