Unit Two Review

In the Balloon Lab experiment, what happens when the baking soda falls into the vinegar?

• The mixture remains unchanged.

• A chemical reaction occurs, producing carbon dioxide gas.

• The vinegar evaporates quickly.

• The baking soda dissolves without any reaction.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What causes the balloon to inflate in the experiment shown in the image?

• Chemical reaction producing gas

• Increase in temperature

• Decrease in pressure

• Addition of water

Tags

NGSS.MS-PS1-2

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The temperature before the experiment was 20° C, and after it was 15°C. What is the best explanation for this change in temperature of the reactants?

• An endothermic reaction occurred

• The liquid was starting to freeze

• An exothermic reaction occurred

• The room became colder

Tags

NGSS.MS-PS1-4

Students recorded their observations from the reaction. Select the three observations that would indicate a chemical change.

• the bottle felt colder after the baking soda was added

• the balloon inflated

• the baking soda and vinegar bubbled and fizzed

• the baking soda and vinegar became a mixture

• the vinegar boiled

Tags

NGSS.MS-PS1-2

A compound is:

• a single element

• a mixture of elements

• a substance formed when two or more chemical elements are chemically bonded together

• a type of molecule that contains only one type of atom

Tags

NGSS.MS-PS1-1

Fill in the blank: A compound can only be broken down into its individual components through a ________.

• chemical reaction

• physical change

• mechanical process

• simple mixture

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is the main difference between a compound and a mixture?

• Compounds are chemically combined, mixtures are not.

• Compounds can be separated by physical means, mixtures cannot.

• Compounds have variable composition, mixtures have fixed composition.

• Compounds are always homogeneous, mixtures are always heterogeneous.

Which process can separate a salt and water mixture?

• Electrolysis

• Evaporation

• Filtration

• Combustion

Select all the following that are compounds.

• Salt

• Saltwater

• Water

• Chex Mix

• Hydrogen

Tags

NGSS.MS-PS1-1