Elements, Compounds and Mixtures

Question 1

Define

Elements

Answer 1

A pure substance that cannot be split up into two or more simpler substances by chemical processes or electricity

Question 2

What are some physical properties of metals?

Answer 2

1. Shiny
2. Solids at r.t.p.
3. Malleable
4. Sonorous
5. Ductile (can be drawn into wires)
6. High melting points and boiling points
7. Good conductors of heat
8. Good conductors of electricity in all states

Question 3

What are some physical properties of non-metals?

Answer 3

1. Dull appearance if solid
2. Low melting points and boiling points
3. Brittle if solid
4. Poor conductors of heat
5. Poor conductors of electricity

Question 4

Define

Atom

Answer 4

Smallest particles of an element that have chemical properties of the element

Question 5

Define

Compounds

Answer 5

A pure substance that is made up of two or more elements chemically combined in a fixed ratio

Question 6

What are some characteristics of a compound?

Answer 6

1. Physical and chemical properties of compounds are very different from the constituent elements
2. Always in a fixed mass ratio
3. Heat or light is taken in or given out during the formation of a compound

Question 7

How can compounds be broken down

Answer 7

Using heat, light or electricity

Question 8

Define

Mixtures

Answer 8

Mixtures are formed when two or more substances are added together without chemical bonds being formed

Question 9

What are some characteristics of mixtures?

Answer 9

1. Components can be seperated by physical means
2. Chemical properties are the same as the components
3. Little to no energy change when a mixture is formed
4. Mixture can have components of any proportion