Unit 6 Test

Grace is holding a rock in her hand. The rock has a definite volume and a definite shape. What state of matter is the rock?

• solid

• liquid

• gas

• plasma

Daniel is heating a pot of water on the stove. The amount of energy needed to change the water from a liquid to a gas is the heat of __________.

• evaporation

• fusion

• vaporization

• condensation

Emma and Oliver are making a salad by combining lettuce, tomatoes, and cucumbers. The result is a(n) __________.

• chemical change

• element

• compound

• mixture

Priya is sitting in a park and enjoying the fresh air. The air that she breathes is an example of a(n) __________ solution.

• solid

• liquid

• gaseous

• plasma

As Grace heats a pot of water on the stove, the water molecules __________.

• are unaffected

• move more quickly

• move more slowly

• stop moving

David is building a small wooden model and has a piece of wood that measures 3 cm by 6 cm by 4 cm. The wood has a mass of 80 g. What is the density of the wood?

• 0.9 g/cm³

• 0.16 g/cm³

• 1.11 g/cm³

• 3.64 g/cm³

Lily is conducting a science experiment. She observes three examples of physical changes:

• sawing wood, crushing a can, and burning a marshmallow

• burning of gasoline, rotting an egg, and exploding fireworks

• freezing of water, evaporation of gasoline, and rusting of a nail

• boiling of water, blowing up a balloon, and melting a candle

Benjamin accidentally dropped a glass on the floor. Which of the following is evidence that a physical change has occurred?

• Broken glass

• Rust

• Bubbles

• Formation of a solid precipitate

Grace is conducting an experiment in her science class. She observes various characteristics of a substance. Which of the following is not a physical property?

• Color

• Odor

• State

• Reactivity with oxygen

Liam opened a bottle of perfume in a room, and soon the fragrance spread evenly throughout the room. This is because the particles in the perfume are a __________.

• solid

• liquid

• gas

• plasma