Which statement about molecules is true?

Molecules are formed by atoms bonding together.

Molecules are always composed of only one type of atom.

Molecules are the smallest unit of an element that keeps its chemical properties.

Molecules cannot be represented by chemical formulas.

What does the chemical formula H₂O represent?

a compound consisting of two hydrogen atoms and one oxygen atom

a mixture of hydrogen and oxygen

What happens to the atoms in a substance during a chemical change?

They are rearranged to form new molecules.

They remain in the same arrangement.

They move farther apart without changing structure.

Which statement best explains why a precipitate forms when two solutions are mixed? '

The solutions are both clear and colorless.

The 2 solutions combine to form a solid

Which statement about molecules is true?

Molecules are formed by atoms bonding together.

Molecules are always composed of only one type of atom.

Molecules are the smallest unit of an element that keeps its chemical properties.

Molecules cannot be represented by chemical formulas.

What does the subscript '3' in the chemical formula Al2O3 indicate?

There are 3 oxygen atoms in the molecule.

There are 3 aluminum atoms in the molecule.

There are 3 molecules of aluminum oxide.

There are 3 atoms of both aluminum and oxygen in the molecule.

In an aqueous solution, what is the role of the water?

It is the substance that dissolves the solute.

It is the substance that gets dissolved.

It is the substance that reacts with the solute.

It is the substance that precipitates out of the solution.

In an aqueous solution, what is the role of the water?

It is the substance that dissolves the solute.

It is the substance that gets dissolved.

It is the substance that reacts with the solute.

It is the substance that precipitates out of the solution.

What happens to the concentration of a solution if you add more solvent to it?

The concentration stays the same.

The solution becomes saturated.

Which model best shows the difference between a solution with a high concentration and a solution with a low concentration, including solute particles, solvent, and the amount of concentration in each solution?

A model where the high concentration solution has more solute particles in the same amount of solvent compared to the low concentration solution.

A model where both solutions have the same number of solute particles and solvent.

A model where the low concentration solution has more solute particles than the high concentration solution.

A model where neither solution contains any solute particles.

Which of the following correctly identifies how to dilute a solution?

Add more solvent to the solution.

Add more solute to the solution.

Boil the solution to evaporate some of the liquid.

Dump out as much of the solvent as possible.

Which of the following explains why granulated sugar will dissolve at a faster rate in water than a sugar cube?

Granulated sugar has more surface area.

Granulated sugar has less surface area.

Granulated sugar has less density.

Granulated sugar has more density.

Which of the following would likely slow down the dissolution rate of salt in water?

Decreasing the temperature of the water.

Stirring the solution continuously.

Grinding the salt into smaller pieces.

Shaking the solution vigorously.

Heating water will most cause which of the following to occur?

The solubility of the solute will increase.

The solubility of the solute will decrease.

The solubility of the solvent will decrease.

There will be no changes that occur.

Which of the following occurs when you stir a solution continuously?

The rate of dissolution increases.

The rate of dissolution decreases.

The rate of dissolution remains the same.

The solubility remains the same.

Which of the following could be a possible scenario for B?

Breaking a large chunk of salt into smaller pieces

Stirring sugar into a glass of water

Stirring sand into a glass of water

Which of the following could be a possible scenario for C?

Using cold water to dissolve a solute more slowly

Shaking sugar in a container of water

Grinding salt from a salt shaker

Which of the following could be a possible scenario for D?

Stirring a solute continuously in water

Breaking a large chunk of salt into smaller pieces

Using cold water to dissolve a solute more slowly

CBA 1 Review 25-26

Quiz

•

Science

•

7th Grade

•

Practice Problem

•

Hard

•

NGSS

MS-PS1-1, MS-PS1-2, MS-PS1-4

+2

Standards-aligned

HEATHER FRIEDMAN

FREE Resource

Tags

NGSS.MS-PS1-1

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How many elements are found in the chemical formula CO₂, _______

How many atoms are in the chemical formula O₂, _______

How many atoms are in the chemical formula C₁₂H₂₂O₁₁, _______

How many elements are in: C₁₂H₂₂O₁₁,

For the formula F₂, fill in the number of elements: _______

How many atoms are in H₂O₂

For the formula C₃H₈, fill in the number of atoms: _______

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Which statement about molecules is true?

What does the chemical formula H₂O represent?

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