Extra questions - C5

Question 1

how many cm cubed in dm cubed

Answer 1

0.001

Question 2

What is the meaning of the term precipitation reaction

Answer 2

insoluble solid being formed

Question 3

How can magnesium hydroxide be separated from calcium chloride solution

Answer 3

filtration

Question 4

Method that can be used to change calcium chloride solution into solid calcium chloride

Answer 4

crystallisation

Question 5

Complete equation

Ca -> Ca 2+ +

Answer 5

2e-

Question 6

Why can the formation of calcium ions from calcium atoms be described as oxidation

Answer 6

electrons are lost

Question 7

The reaction between sodium and titanium chloride is a redox reaction. Write a half equation to show that sodium is oxidised in this reaction

Answer 7

Na -> Na+ + e-

Question 8

Describe how sodium metal conducts electricity

Answer 8

delocalised electrons carry electrical charge through metal

Question 9

Explain how sodium chloride can conduct electricity

Answer 9

When molten because ions are free to move.

Question 10

Plan an investigation to find the order of reactivity of three metals
Use temp change when each metal reacts with hydrochloric acid

Answer 10

• measure volume of h acid
• measure initial temperature with thermometer of h acid
• add 3g of each metal
• stir
• measure highest temp reached of solution after 2 minutes
• repeat for each metal
• use results to arrange metals in order of reactivity - most reactive metal has largest temperature change