Question 1

Reactivity is...

Accepted Answer

the ease with which a substance will react with another substance

Answer

the formation of new compounds

Answer

changing the physical state of a substance

Answer

doing an activity twice

Question 2

When water is heated to form steam this process is called...

Accepted Answer

evaporation

Answer

boiling

Answer

cooling

Answer

condensing

Question 3

When water is cooled to form ice this process is called...

Accepted Answer

freezing

Answer

evaporation

Answer

boiling

Answer

cooling

Question 4

Melting chocolate is a...

Accepted Answer

physical change

Answer

chemical change

Question 5

The rusting of iron is a...

Accepted Answer

chemical change

Answer

physical change

Question 6

A physical change is always...

Accepted Answer

easily reversible and involves the formation of no new substances

Answer

not easily reversible and involves the formation of no new substances

Answer

easily reversible and involves the formation of new substances

Answer

not easily reversible and involves the formation of new substances

Question 7

Chemical changes...

Accepted Answer

always  involve the formation of one or more new substances and are not easily reversed.

Answer

do not  involve the formation of new substances and are easily reversed.

Answer

always  involve the formation of one or more new substances and are easily reversed.

Answer

do not  involve the formation of new substances and are not easily reversed.

Question 8

Chemical changes usually involve at least one of the following...

Accepted Answer

a change in appearance, a detectable energy change, the production of a gas

Answer

a change in pH, a detectable energy change, the production of a gas

Answer

a change in appearance, a detectable energy change, the production of a liquid

Answer

a change in appearance, a detectable gas, the production of a flame

Question 9

When metals react with oxygen they form...

Accepted Answer

a metal oxide

Answer

a metal carbonate

Answer

a metal sulphate

Answer

a metal chloride

Question 10

Ionic compounds such as sodium chloride a formed by the attractive forces between...

Accepted Answer

positively charged metal ions and negatively charged non-metal ions

Answer

positively charged metal ions and positively charged non-metal ions

Answer

positively charged non-metal ions and negatively charged metal ions

Answer

negatively charged non-metal ions and negatively charged metal ions

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