Year 8 Chemistry: Material Changes

Which of the following would be considered a physical change?

• Cutting paper

• pH test

• Burning marshmellow

• Roasting a Turkey

Is water melting a physical or chemical change?

• Physical
• Chemical

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

In a chemical change, new substances are formed, for example

• burning of wood

• heating glass and bending it

• boil water

• melting an ice cube

iron + sulfur -----> iron sulfide

from that word equation, the reactant(s) is/are ....

• iron

• sulfur

• iron and sulfur

• iron sulfide

when something burns, it reacts with the .... in the air

• CO₂

• CO

• O₂

• C

When magnesium reacts with hydrochloric acid, a gas is given off. The gas is .......

• Oxygen

• Hydrogen

• Carbon dioxide

• Carbon monoxide

When the hydrogen pops, it is reacting with oxygen to form .....

• water

• gas

• ash

• pop

zinc +sulfuric acid ---> ....... + hydrogen

• zincate

• zinc acid

• zinc sulfate

• sulfate

Copper carbonate + hydrochloric acid --->

• Copper chloride + water + carbon dioxide

• Copper chloride

• water

• carbon dioxide

What happens in a chemical reaction?

• Atoms form new combinations

• Atoms do not form new combinations