AQA GCSE Chemical Analysis quiz FT

What is chemical analysis?

• Identifying unknown substances
• Analytical chemistry
• Identifying known substances
• Chemical experiments

In chemistry what is a "pure" substance?

• No additives
• A mixture
• Made of one element/compound only
• A formulation

How can pure substances be distinguished from impure ones?

• Melting/boiling points
• Colour
• Smell
• Temperature

Describe the melting and boiling points of pure substances

• Range of temperature
• Fixed
• Different temperature
• One very specific temperature

Describe the melting and boiling points of impure substances

• Fixed
• Range of temperature
• Different temperature
• One very specific temperature

What is a formulation?

• Milk

• Mixture designed as a useful product

• Calculation

• A random mixture

which one of these is a way to separate a mixture?

• Oxidation

• Displacement

• Chromotography

• Combustion

In paper chromatography, what is the mobile phase?

• Pencil line
• Paper
• Ink
• Solvent e.g. water

How can chromatography show pure or impure substances?

• Impure = no dots
• Pure = many dots
• Impure = single dot
• Pure = single dot

In chromatography, why is a pencil used to draw the line?

• It’s insoluble
• It's soluble
• It's sharper
• Neutral colour