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 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.

No, it is not possible because they have different extensive properties.
No, it is not possible because they have different extensive properties.
Question 2
A)Melting gold with other metals makes 20-karat gold. Which term best describes 10-karat gold?(1 point)
Responses

compound
compound

homogeneous mixture
homogeneous mixture

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 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 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 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.
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 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.

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.
Question 5
A)How did the study of the atom contribute to our understanding of the periodic table of the elements?(1 point)
Responses

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.

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.

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.
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.

An ionic bond would form because both atoms are nonmetals.
An ionic bond would form because both atoms are nonmetals.

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.
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

K and Ca
K and Ca

Na and Cl
Na and Cl

C and O
C and O

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

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

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

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

It accepts protons and only partially dissociates in water.

Answer 1

Here are the answers to your questions:

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

Question 2: homogeneous mixture

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

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

Question 5: 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 covalent bond would form because the electron would be shared so both hydrogens have a full, stable shell.

Question 7: Na and Cl

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

Question 9: High temperatures mean that sodium and chlorine ions will be moving faster, increasing the odds that they will collide and combine. This reduces solubility.

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

Feel free to ask if you have more questions or need further explanations!