Matter (10q)

Matter that is composed of two or more different elements chemically combined in a fixed proportion is classified as

• a compound

• an isotope

• a mixture

• a solution

Which substance can be decomposed by chemical means?

• water

• oxygen

• phosphorus

• sillicon

Which substance represents a compound?

• C(s)

• Co(s)

• CO(g)

• O₂(g)

A sample of unknown composition was tested in a laboratory. The sample could not be decomposed by physical or chemical means. On the basis of these results, the laboratory reported that the unknown sample was most likely

• a compound

• an element

• a mixture

• a solution

• an element

• a compound

• a homogenous mixture

• a heterogeneous mixture

• 
• 
• 
• 

Which process represents a chemical change?

• melting of ice

• corrosion of copper

• evaporation of water

• crystallization of sugar

• atomic change

• physical change

• chemical change

• nuclear change

The laboratory process of distillation does not involve

• changing a liquid to vapor

• changing a vapor to liquid

• liquids with different boiling points

• liquids with the same boiling points

If a student pours a mixture of sand and salt water through a filter paper into a beaker, what will be found in the beaker after filtering?

• salt, only

• sand, only

• salt and water

• salt and sand