C8 Chemical Analysis

What is chemical analysis?

• The process of establishing what chemicals are present in a substance

• A process that has had nothing added to it and is in its "natural" state

• An instrumental analysis tool for identifying metal ions

• The process of using small molecules (monomers) to make long chain molecules (polymers)

In everyday language what is a "pure" substance?

• A substance that has had nothing added to it and is in its "natural" state

• A substance made of a single element or compound

• A complex mixture designed as a useful product

• fuels, cleaning agents, paints, medicines, alloys, fertilisers and foods.

In chemistry what is a "pure" substance?

• A substance that has had nothing added to it and is in its "natural" state

• A substance made of a single element or compound

• A complex mixture designed as a useful product

• fuels, cleaning agents, paints, medicines, alloys, fertilisers and foods.

How can pure substances be distinguished from impure ones?

• By their melting/boiling points

• By their colour

• By their reaction with oxygen

• Whether they conduct or not

Describe the melting and boiling points of pure substances

• One very specific temperature

• They change state at a range of temperatures

Describe the melting and boiling points of impure substances

• One very specific temperature

• They change state at a range of temperatures

What is a formulation?

• A substance that has had nothing added to it and is in its "natural" state

• A substance made of a single element or compound

• A complex mixture designed as a useful product

• fuels, cleaning agents, paints, medicines, alloys, fertilisers and foods.

Which is NOT an example of a formulations

• fuels

• cleaning agents

• paints

• hydrogen gas

What is chromatography?

• A process to separate the constituents of a mixture

• A way to separate two liquids

• A process to separate solid from liquid

• A process which separates a soluble solid from a solvent

In paper chromatography, what is the stationary phase?

• The paper

• The solvent

• The mixture

• The chromatography jar