Review for Quiz #4

Chewing food to break it down into smaller particles represents a _________ change, but the changing of starch into sugars by enzymes in the digestive system represents a ___________change.

• chemical, physical

• physical, chemical

• physical, physical

• chemical, chemical

Which of the following is not a chemical change?

• rusting

• boiling

• rotting

• burning

Jack has a rock. The rock has a mass of 14g and a volume of 2cm³. What is the density of the rock?

• 7 mL
• 7 g/cm³
• 28 g/cm³
• 1/7 g/cm³

One cup of water is left outside for two days. When it was checked, there was only half a cup left. What happened?

• evaporation; chemical change

• condensation; physical change

• evaporation; physical change

• condensation; chemical change

In each investigation scientists combined 2 liquids under a vent hood & recorded their observations. In which investigation is a chemical change least likely?

• 1
• 2
• 3
• 4

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is a sign that a chemical reaction has occurred?

• change in shape
• melting
• formation of a gas
• dissolving

Tags

NGSS.MS-PS1-2

Is "sugar dissolves in water" a chemical or physical change?

• Chemical change
• Physical change

Tags

NGSS.MS-PS1-2

How is a gas defined?

• Indefinite shape, indefinite volume
• Definite shape, definite volume
• Found in stars
• Definite volume, indefinite shape

Particles (molecules) in a ______________________ have more energy than the other states of matter.

• gas
• solid
• liquid

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

The state of matter that has no definite size or shape is

• solid

• liquid

• gas