Y9 chemistry quiz on air and water

what is potable water?

• pure water

• water that is safe to drink

• sea water

• water

ways of making water potable are (tick all that are correct):

• add chlorine

• add ozone

• treat with UV light

• filtration

The pie chart shows the composition of the Earth's atmosphere TODAY. What gas does the blue portion represent?

• carbon dioxide

• oxygen

• nitrogen

• ammonia

The pie chart shows the composition of the Earth's atmosphere TODAY. What gas does the orange portion represent?

• oxygen

• carbon dioxide

• nitrogen

• ammonia

Which factors caused a reduction in the amount of carbon dioxide in the earth's early atmosphere? Tick all that are correct

• photosynthesis

• dissolving in the oceans

• respiration

• volcanic eruptions

What led to the increasing levels of oxygen gas in the early atmosphere?

• breakdown of sedimentary rocks

• volcanic eruptions

• respiration

• photosynthesis by algae and plants

What chemical reaction occurs in living cells that uses oxygen and releases carbon dioxide, in other words the complete reverse of photosynthesis?

• respiration

• oxidation

• thermal decomposition

• transpiration

read all the options before chosing! Which statement best describes air?

• a mixture

• a mixture of substances

• a mixture of elements

• a mixture of elements and compounds

What type of reaction happens when limestone gets heated up?

• neutralisation

• thermal decomposition

• oxidation

• combustion

an element is...

• made up of different types of atoms mixed together

• made of 2 or more of the same atoms chemically combined

• made of only one type of atom

• made of 2 or more different atoms chemically combined