Chemistry Week One Quiz Answers

1. Classify the following as either a chemical or physical change:

The burning of a substance is a chemical change.

The crushing of a rock is a physical change.

Dissolving sugar in water is physical change


 The rusting of Iron is chemical change.


2. Classify the following as to whether or not they are pure substances or mixtures:

Milk is a mixture.

Table salt is actually a mixture. 

Sugar is typically a pure substance.

Steel is a homogeneous mixture of iron and carbon.


3. A cup of black coffee is considered to be __?__ and a/an __?__ substance:

 Homogeneous. Impure


4. The boiling of water is considered to be a __?__ change and the temperature at which water boils is considered to be a __?__ property:

 Physical.Physical