Counting Atoms & Chemical Reactions

Front

Which statement is not true? Options: A molecule of sorbitol contains three more oxygen atoms than a molecule of glutamine. A molecule of lactose contains twice as many atoms as a molecule of fructose does. A molecule of fructose contains four more atoms than a molecule of glutamine does. A molecule of lactose contains twice as many carbon atoms as a molecule of sorbitol does.

Back

A molecule of lactose contains twice as many atoms as a molecule of fructose does.

Tags

NGSS.MS-PS1-1

Front

Observation that provides evidence of a chemical reaction when removing tarnish from a silver ring using aluminum foil, hot water, and baking soda.

Back

The liquid solution changed color

Tags

NGSS.MS-PS1-2

Front

Hydrogen peroxide breaks down to form water and oxygen gas. Which observation is evidence that a chemical reaction has occurred? Options: The mass of the solution remains the same., Phase changes are observed., The color of the solution remains clear., The temperature of the solution increases.

Back

The temperature of the solution increases.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

Front

Students mixed two liquids in a beaker and listed their observations.

Based on these observations, which statement contains the best evidence that a chemical reaction occurred?

• There is a change in shape.
• There is a change in volume.
• The two liquids mix into a solution.
• The two liquids form a new substance.

Back

The two liquids form a new substance.

Tags

NGSS.MS-PS1-2

Front

Which substance listed in the chart is made up of the most atoms? Options: Carbonic acid, Nitric acid, Phosphoric acid, Sulfuric acid

Back

Phosphoric acid

Tags

NGSS.MS-PS1-1

Front

Which pair of elements has reactivity that is similar to chlorine, Cl? Options: Fluorine, F, and argon, Ar; Fluorine, F, and iodine, I; Sulfur, S, and bromine, Br; Sulfur, S, and argon, Ar

Back

Fluorine, F, and iodine, I

Front

Which statement best describes evidence that a chemical reaction occurs as a cake bakes?

Back

The cake rises as gas bubbles form in the baking cake

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

Which of these provides evidence that a chemical reaction occurs?

• A gas is present
• The total number of atoms remains unchanged.
• The state of matter remains the same.
• A brown gas is produced.

Back

A brown gas is produced.

Tags

NGSS.MS-PS1-2

Front

What evidence supports the inference that a chemical reaction occurred?

Back

A dark solid formed on the zinc metal.

Tags

NGSS.MS-PS1-2

Front

Which substance went through a chemical reaction? Options: water, aluminum, wax, paper.

Back

paper

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5