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WorksheetsS2 chemical reactions
Total questions: 15
Worksheet time: 8mins
Which of the following is not a sign of a chemical reaction?
colour change
dissolving
bubbles/ gas being produced
precipitate being formed
Which of the following will always happen in a chemical reaction?
new substance is formed
colour change
gas produced
increased surface area
Which of the following is an example of a chemical reaction?
melting an ice cube
dissolving sugar in water
mixing pancake batter
baking a cake
Which of the following is an example of a physical change?
chocolate melting
iron nails rusting
mixing vinegar and baking soda
copper sulphate and iron filings
Which of the following would not speed up a chemical reaction?
increasing the surface area
increasing the temperature
diluting the acid
adding a catalyst
Which of the following would speed up a chemical reaction?
adding more acid
adding water
using powdered marble instead of chunks
adding ice
Hydrogen peroxide gets broken down by catalase into oxygen and water. Name the product(s) of this reaction
hydrogen peroxide
catalase
oxygen
oxygen and water
starch is broken down by amylase into maltose. name the reactant(s) of this reaction.
amylase
maltose
starch
sugar
Combustion is a reaction of any substance with which element?
Carbon dioxide
oxygen
hydrogen
helium
Which substance dissolved in rain to produce acid rain?
sulphur dioxide
carbon dioxide
hydrogen
carbon
Which of the following is an effect of acid rain
rusting fences
leaves falling off trees in winter
pH of lochs and rivers changing
plant life thriving
Combustion is the technical term for which reaction?
burning
melting
freezing
condensing
Where are enzymes found?
In all living cells
catalytic converters
acid rain clouds
In non-living cells
Why are enzymes known as biological catalysts?
The slow down chemical reactions inside living cells
They stop chemical reactions taking place
They speed up chemical reactions
They speed up chemical reactions inside living cells
Why does using powered magnesium make a reaction with hydrochloric acid happen faster?
increases the concentration of acid
decreases the surface area
increases the surface area
decreases the temperature
