Grade 8 8G Review

Metals and non-metals can be differentiated by their .....

• physical properties

• acidity

• boiling points

• mass

Which qualities are associated with metals?

• Good conductor of heat

• Brittle

• Flexible

• Shiny

The burning of wax in this image is a....

• chemical change

• physical change

• chemical reaction

• physical reaction

Answer explanation

A chemical change has occurred when a new substance has formed. Chemical changes occur during chemical reactions.

Most metals will react with...

• Oxygen

• Copper

• Halogens

• Iron

"Speed of reaction" refers to...

• How long a reaction takes to finish

• The rate of reaction

• The amount of seconds for half of the reaction finish

• How fast a reaction will move forward (proceed)

Which feature(s) describe catalysts?

• Change the rate of reaction

• Must be a metal

• Are used up in the reaction

• Are required for a reaction to occur

Corrosion is the reaction of ________ with metal and occurs ________

• oxygen; on the surface only

• Water; on the surface only

• Oxygen; anywhere on the metal

• Water; anywhere on the metal

Which option(s) correctly describes corrosion and rusting

• Corrosion describes any metal that reacts with oxygen, Rusting is the corrosion of iron specifically

• Corrosion describes any metal that reacts with oxygen, rusting is the corrosion of transition metals specifically

• Corrosion occurs only in non-metals, rusting occurs in metals

• Corrosion happens first and then rusting happens on top of the corrosion

Corrosion will only occur if there is _____ in the air

• oxygen

• nitrogen

• water

• argon

What equations are shown in this image?

• word equation

• symbol equation

• chemistry equation

• oxygen equation