10 questions🇬🇧English
🔥 Combustion & Oxidation – Year 8
Chemistry · Year 8 (KS3) — the fire triangle, complete and incomplete combustion and metal oxides
Make it your own private quiz and change anything you like
Questions
The fire triangle shows the three things a fire needs. Which set is correct?
Heat, fuel and nitrogen
Water, fuel and oxygen
Heat, fuel and oxygen
Heat, fuel and carbon dioxide
20s
Which result shows that a gas is carbon dioxide?
It gives a squeaky pop with a lit splint
It bleaches damp litmus paper
It turns limewater milky
It relights a glowing splint
20s
What are the products when a fuel such as methane burns completely in plenty of oxygen?
Carbon monoxide and water
Carbon dioxide and hydrogen
Carbon dioxide and water
Carbon and oxygen
20s
A fire blanket is thrown over a burning pan. Which part of the fire triangle does it remove?
Carbon dioxide
Oxygen
Heat
Fuel
20s
When a fuel burns without enough oxygen, which toxic gas can be produced?
Nitrogen
Carbon dioxide
Carbon monoxide
Hydrogen
20s
Which word equation correctly shows magnesium burning in air?
magnesium + oxygen → magnesium dioxide
magnesium + carbon dioxide → magnesium oxide
magnesium + oxygen → magnesium oxide
magnesium + water → magnesium oxide
30s
Which of these changes is an oxidation reaction?
Ice melting into water
Salt dissolving in water
Water boiling in a kettle
Iron rusting in damp air
30s
A Bunsen burner with its air hole closed gives a yellow, sooty flame. Why?
Extra oxygen is mixing with the gas
Incomplete combustion is taking place
The gas is burning at a higher temperature
Complete combustion is taking place
30s
2.4 g of magnesium reacts completely with 1.6 g of oxygen. What mass of magnesium oxide forms?
2.4 g
0.8 g
4.0 g
3.2 g
30s
A candle burns on a balance and the reading goes down. What is the best explanation?
Some mass is destroyed when the wax burns
The wax is changed completely into heat energy
Oxygen leaves the wax as it burns
The products are gases that escape into the air
30s