CC

Question 1

What is precipitation

Answer 1

Process in which an insoluble solid is formed when two solutions are mixed

Question 2

What are two chemical reactions involving oxidation

Answer 2

rusting and respiration

Question 3

What does rusting involve

Answer 3

The oxidation of iron when left exposed to the atmosphere, forming iron (III) oxide (Fe2O3) or rust

Question 4

What does respiration involve

Answer 4

The oxidation of food substances, like glucose, to release energy for cellular activities

Question 5

Does oxidation require heating &/ oxygen

Answer 5

No; Yes

Question 6

What is combustion

Answer 6

The burning of substances (such as fuels) in oxygen.

Question 7

What is released during combustion

Answer 7

Energy

Question 8

What is a real-life example of decomposition by light

Answer 8

Camera films are coated with silver bromide which breaks down into silver + bromine

Question 9

What is a real-life example of decomposition by heat

Answer 9

glucose ->carbon + water +black solid

Question 10

What does copper(II)carbonate become after thermal decomposition

Answer 10

green solid -> copper(II)oxide (black solid) + CO2

Question 11

How is electrolysis used in real life

Answer 11

water -> hydrogen + oxygen to collect hydrogen fuel