Physical and Chemical Changes

A combustion reaction usually results in heat and ______.

• a. light

• b. an acid

• c. oxygen

• d. a base

Which is a chemical change?

• a. melting ice

• b. boiling water

• c. a candle burning

• d. frost forming inside a freezer

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A solid formed by the chemical reaction of some solutions is a ________.

• a. mixture

• b. reactant

• c. precipitate

• d. base

Tags

NGSS.MS-PS1-2

When reactants form products, a(n) ______ has occurred.

• a. base

• b. chemical reaction

• c. acid

• d. mixture

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following indicate that a chemical reaction has occurred?

• a. the formation of gas bubbles

• b. a change in color

• c. an odor

• d. all of these indicate that a chemical reaction has occurred.

Tags

NGSS.MS-PS1-2

A student mixes yellow powder with water. Which observation would prove a CHEMICAL change occurred?

• The powder DISSOLVED in the water

• The water turned the COLOR yellow

• The bag's TEMPERATURE changed

• The STATE OF MATTER changed

Tags

NGSS.MS-PS1-2

A white tablet is dropped into water. The water becomes cloudy and bubbles are produced. What type of change has occurred?

• Physical change

• Chemical change

• No change

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

When mixing milk and vinegar, a white, chunky, solid substance is formed. What has occurred?

• Physical change: state of matter

• Chemical change: precipitate

• Physical change: freezing

• Chemical change: rust

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

When iron is exposed to air over a long period of time, it forms rust. This is an example of what?

• A new substance forming

• Color change: no new substance

• Shape change: no new substance

• Burning: a new substance

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Students observed a piece of iron change from shiny to rusty. What caused this change?

• a chemical reaction

• a heat reaction

• a cold reaction

• a physical reaction

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5