Y11 Mock Exam Review January 2023

What observations do you often see in chemical reactions? (more than one correct answer)

• Bubbles

• Colour Change

• Temperature change

• Gas

How do you remove an insoluble solid from a liquid?

• Filtration

• Distillation

• Chromatography

• Evaporation

If the pH during a reaction reaches pH7, what type of reaction is this?

• Decomposition

• Neutralisation

• Displacement

• Endothermic

What is the ratio of hydrogen : oxygen atoms in a molecule of water?

• 1:2

• 1:1

• 2:1

• 4:1

What is the uncertainty of these values?

6, 9, 10, 11

(calculate the range first)

• +-1

• +-2

• +-3

• +-4

This substance will fully ionise in water...what does this describe?

• weak acid

• strong acid

• weak alkali

An acid has a pH of 4. If you increase the concentration of hydrogen ions by a factor of 100, what will the new value for pH be?

• 6

• 5

• 2

• 3

What method is used to extract aluminium from its ore?

• Displacement

• Electrolysis

What is missing?

4Na + TiCl₄ --> Ti + 4____

• NaCl

• NaCl₄

• TiCl₄

• Na₄Cl

Sodium chloride is able to conduct electricity when molten or dissolved because...

• there are delocalised electrons

• the ions are free to move