Chemical and Physical Changes

You know a chemical change has happened if-

• the state of matter changes.

• there is a color change.

• there is a decrease in mass.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

During a chemical reaction, ______ is never created or destroyed.

• color

• particles

• mass/matter

Tags

NGSS.MS-PS1-5

Three different mixtures are created by combining two liquids. Which mixture indicates that a new substance has been formed.

• Mixture 1: The combined liquids have a greater mass than either of the starting liquids.

• Mixture 2: The mixture of the two liquids takes the shape of the container they are in.

• Mixture 3: The mixture turns a bright yellow when the two liquids are combined.

Tags

NGSS.MS-PS1-2

A solid that forms from a solution during a chemical reaction is called a (n):

• formula

• precipitate

Which list correctly identifies physical properties of matter?

• state of matter, ability to burn, ability to tarnish, color

• magnetic, density, malleability, melting point

Which of the following is an example of a physical change?

• burning a pencil

• water evaporating

Which of the following is NOT a sign that a chemical reaction has taken place?

• Gas bubbles form when baking soda and vinegar react.

• A blue liquid and a green liquid combine and there is no change in temperature.

Tags

NGSS.MS-PS1-2

Which of the following would indicate a new substance has been formed?

• Bubbling and fizzing occur.

• Powder dissolves in an unknown liquid.

Tags

NGSS.MS-PS1-2

Define a physical change.

• A characteristic that can only be observed when atoms rearrange.

• A change to a substance that occurs without forming a new substance.

This can be released during a chemical change:

• reaction

• energy

Tags

NGSS.MS-PS1-4