Experimental Techniques & Chemical Analysis

During a reaction, the following changes take place.
1 The temperature rises.
2 A gas is given off.
Which apparatus is required to measure the rate of this reaction?

• balance and burette

• balance and gas syringe

• gas syringe and burette

• gas syringe and stopclock

Which piece of apparatus is used to measure variable quantities of liquid in a titration?

• 
• 
• 
• 

Which method separates a mixture of sugar and glass?

• dissolve, filter and evaporate

• distil and filter

• fractionally distil

• use chromatography

A student is investigating a coloured mixture using chromatography. Where should the student place the coloured mixture?

• in the solvent

• just above the pencil line

• just below the pencil line

• on the pencil line

The diagrams show liquids in a burette and a measuring cylinder. Which row shows the correct readings for the burette and the measuring cylinder?

• burette - 27.8

  measuring cylinder - 42

• burette - 27.8

  measuring cylinder - 44

• burette - 28.8

  measuring cylinder - 42

• burette - 28.8

  measuring cylinder - 44

The diagram shows how muddy water can be purified. Which process for purifying the muddy water is shown?

• crystallisation

• distillation

• filtration

• solvent extraction

A student is given a mixture of barium sulfate, copper(II) sulfate and water. The table shows information about barium sulfate and copper(II) sulfate. How does the student obtain copper(II) sulfate crystals from the mixture?

• crystallisation followed by distillation

• crystallisation followed by filtration

• distillation followed by crystallisation

• filtration followed by crystallisation

A student measures the time taken for 2.0 g of magnesium to dissolve in 50 cm³ of dilute sulfuric acid. Which apparatus is essential to complete the experiment?

1 stop-clock

2 measuring cylinder

3 thermometer

4 balance

• 1, 2 and 4

• 1 and 2 only

• 1 and 4 only

• 2, 3 and 4

Lead(II) iodide is insoluble in water. Lead(II) iodide is made by adding aqueous lead(II) nitrate to aqueous potassium iodide. Which pieces of apparatus are needed to obtain solid lead(II) iodide from 20 cm3 of aqueous lead(II) nitrate?

• 1, 2 and 4

• 1, 3 and 5

• 1, 4 and 5

• 2, 4 and 5

Which test is used to show that a sample of water is pure?

• Evaporate the water to see if any solids remain.

• Heat the water to check its boiling point.

• Test with anhydrous cobalt(II) chloride.

• Use universal indicator paper to check its pH.