Chemical Analysis

A substance is ​ __________  if it is made up of a single element or compound.

In chromatography, the stationary phase is normally

• The solvent

• The paper

• The ink

• The beaker

A formulation is a designed mixture with a specific 'recipe' of components and ratios.

Which of these are examples of formulations?

• Fuel, such as E10 petrol

• Medicine such as aspirin

• Alloy such as brass

• Fertiliser such as rose food

• Cleaning agent such as Dettol

In chromatography, the mobile phase is normally:

• 
  The solvent

• The paper

• The ink

• The beaker

In chromatography, the component that will move furthest is the one that is ​ (a)_________   in the mobile phase.

The definition of R_f value in chromatography is;

• Distance moved by solvent / distance moved by substance

• 
  Distance moved by substance / distance moved by solvent

In a flame test, the colours of five metal ions is:

• Li - red

  Na - yellow

  K - lilac

  Ca - orange-red

  Cu - blue-green

• 
  Li - orange

  Na - yellow

  K - lilac

  Ca - orange-red

  Cu - bright green

• Li - red

  Na - blue

  K - lilac

  Ca - dark red

  Cu - blue-green

To test for Hydrogen gas, we use:

• 
  a lighted splint, it will cause a squeak or pop

• damp red litmus paper, it will turn blue

• lime water, it will turn cloudy

• a glowing splint, it will relight

• 
  damp litmus paper, it will be bleached (turn white)

To test for Oxygen gas, we use:

• a lighted splint, it will cause a squeak or pop

• 
  damp red litmus paper, it will turn blue

• lime water, it will turn cloudy

• 
  a glowing splint, it will relight

• 
  damp litmus paper, it will be bleached (turn white)

To test for Carbon dioxide gas, we use:

• 
  a lighted splint, it will cause a squeak or pop

• damp red litmus paper, it will turn blue

• lime water, it will turn cloudy

• 
  a glowing splint, it will relight

• 
  damp litmus paper, it will be bleached (turn white)