Please enter your email:

1.A metal reacts with dilute hydrochloric acid to produce a gas.What is used to identify this gas?


2.Why is carbon used in the purification of drinking water?


3.Which element will burn in oxygen to form an acidic oxide?


4.The flow chart shows how impure water can be treated to produce drinkable water


What is not removed from the water by this process?


5.Oxygen is formed when manganese (IV) oxide is added to hydrogen peroxide, H2O2

2H2O2 2H2O + O2    In this reaction, the manganese(IV) oxide acts as


6.Oxygen was prepared from hydrogen peroxide and collected as shown in the diagram. 2H2O2 2H2O + O2


The first few tubes of gas were rejected because the gas was contaminated by


7.The apparatus shown is used to measure the percentage by volume of oxygen in the air.



What is substance X?


8.Which gas is present in the light bulb?



9.Which gas can be removed from the exhaust gases of a petrol-powered car by its catalytic converter?


10. Air is a mixture of gases. Which gas is present in the largest amount?


Question 1 of 10