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Total questions: 12
Worksheet time: 9mins
In a chemical change, new substances are formed, for example
heating glass and bending it
melting an ice
burning of wood
boil water
iron + sulfur --> iron sulfide
from that word equation, the reactant(s) is/are ....
iron
iron and sulfur
sulfur
iron sulfide
when something burns, it reacts with the .... in the air
CO2
CO
C
O2
What happens in a chemical reaction?
Atoms form new combinations
Atoms do not form new combinations
In detecting chemical reactions, there are few clues we can look, except ...
A colour change
Heat is produced
A gas is given off
No new substances
. ........ is formed when iron reacts with oxygen in the air
iroxy
rust
crumble
substances
sodium carbonate + hydrochloric acid → sodium chloride + water + carbon dioxide
Which product contains the element hydrogen?
hydrochoric acid
water
carbon dioxide
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