Science Lesson 3: Physical and Chemical Changes

1. Physical changes: _________.

• always create new substances

• cannot be reversed

• change the chemical composition of matter

• begins and ends with the same kind of matter

Tags

NGSS.MS-PS1-4

The best definition of a chemical change/chemical reaction is...

• change that can be easily reversed

• change that does not involve any new substance formation

• change that produces new matter with different properties from the original matter

• change that only alters the shape or size of matter

Tags

NGSS.MS-PS1-2

3. Law of Conservation of Mass: _________.

• states that matter is neither created nor destroyed during a physical change or chemical reaction

• states that energy is always lost during a chemical reaction

• states that mass can be created from nothing in a chemical reaction

• states that only energy is conserved, not mass

Tags

NGSS.MS-PS1-5

The properties of a piece of paper _________ if it is flat or folded into a different shape.

• do not change

• change completely

• become invisible

• turn into metal

What chemical change happens after baking soda and vinegar react?

• no visible change occurs.

• water and salt remain. Carbon dioxide bubbles are released.

• only water is formed with no bubbles.

• the mixture turns into a solid crystal.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

One of the five signs of chemical change is change in color. What is an example?

• water boils to steam

• ice melts to water

• blue dye in water

• metal changes to rust

Tags

NGSS.MS-PS1-2

Which one is NOT one of the five signs of chemical change

• change in odor

• change in color

• paper folding

• temperature change

Burning wood is an example of what sign of chemical change?

• temperature change

• formation of a solid

• formation of gas

• change in color

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

Which is one of the five signs of chemical change?

• water freezing

• Sugar dissolving in water

• formation of gas

  (fizzy antacids)

• dissolving salt

Tags

NGSS.MS-PS1-2

One of the five signs of chemical change is formation of a solid. An example of this is what?

• ice mellting

• salt dissolving

• water boiling

• soap scum

Tags

NGSS.MS-PS1-2