Physical and Chemical Changes

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

Which of the following examples provides evidence of a PHYSICAL change?

• Wood is burned and releases ash and smoke

• Iron rusts over time

• When mixed, baking soda and vinegar form gas bubbles

• Boiling water bubbles when heated

Tags

NGSS.MS-PS1-4

Which of the following options provides evidence of a CHEMICAL change?

• Wood is burned releasing ash and smoke

• Rocks separate when soil is sifted

• Boiling water bubbles when heated

• Salt dissolves in water

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

Water is boiling on a stove, producing steam. What conclusion can you make about the change that is occurring?

• Boiling water bubbles indicate a chemical change

• Steam indicates a state of matter change

• Heat indicates a chemical change

• The clear color indicates a chemical change

Tags

NGSS.MS-PS1-4

Which observations prove a chemical change occurred

• Dissolving and expected color change

• Mixing and dissolving

• State of matter change and boiling water bubbles

• Unexpected color change and temperature change

Tags

NGSS.MS-PS1-2

Which word matches the definition "two liquids make a solid"

• pre-color

• precipitation

• precipitate

• pretest

Tags

NGSS.MS-PS1-2

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

Which of the following is true?

• A physical change produces a new substance

• A chemical change does not produce a new substance

• A physical change can produce a precipitate

• A chemical change can produce a precipitate

Tags

NGSS.MS-PS1-2

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