Practise atmosphere questions by recalling gas percentages, calculating oxygen volume and explaining combustion or carbon dioxide evidence.
This question is about gases.
The table gives information about five gases.
Use information from the table to answer these questions.
Each gas may be used once, more than once or not at all.
Give the name of the gas that is about 79% of the atmosphere by volume.
Give the name of the gas that is not normally found in the atmosphere.
Give the name of the gas that affects global warming.
A student uses the reaction between iron and oxygen to find the percentage of oxygen in air.
The diagram shows the apparatus the student uses.
State why the iron powder needs to be wet.
State the colour of the compound formed in the reaction between iron and oxygen.
Explain the advantage of using iron powder rather than pieces of iron.
The syringe in the diagram shows the reading at the end of the experiment.
Complete table 1 to show the readings on the syringe.
Give both values to the nearest 1 cm3.
table 1
The student repeats the experiment and obtains a different set of results.
Table 2 shows these results.
Use the results from table 2 to calculate the percentage by volume of oxygen in the air.
percentage by volume of oxygen in air = ................................ %
Table 2
This is a question about metals and their compounds.
Magnesium is a metal that burns in air.
State one observation made during the combustion of magnesium metal.