Understanding Mixtures and Chemical Reactions

Which options are signs of a chemical reaction?

• Production of light or heat

• change in color

• change in state of matter

• change in temperature

Tags

NGSS.MS-PS1-2

A mixture is a combination of two or more substances.

• True
• False

Lemonade is an example of a mixture because

• the ingredients are combined without making a new substance

• a new substance is formed

When heat is applied to a mixture, what is the only substance that can be separated?

• sugar

• water

• flour

• all of the above

During a chemical reaction, if the mass changes that means it was in an...

• open system

• closed system

Tags

NGSS.MS-PS1-5

The law of conservation of mass states that...

• mass will never be destroyed or created

• mass can be destroyed

• mass can be created

• if there is a reaction that mass will change

Tags

NGSS.MS-PS1-5

In a closed system the mass should...

• change a little

• stay the same

• change a lot

Tags

NGSS.MS-PS1-5

Ripping a piece of paper is a

• chemical reaction

• physical reaction

Elephants toothpaste is a

• chemical reaction

• physical reaction

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

C12H2 --> CH14

Based on the formula above

• the molecules stayed the same

• the atoms were destroyed

• the molecules broke apart and formed a new substance

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5