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WorksheetsCHEMICAL REACTIONS
Total questions: 10
Worksheet time: 5mins
Has a chemical reaction taken place in this photo?
Yes. Oxidation. A new product (rush) has been formed.
Yes. Fermentation. A new product has been formed.
No. Melting is a change of state but no new products have been formed.
Has a chemical reaction taken place in this photo?
Yes. Oxidation. A new product (rush) has been formed.
Yes. Fermentation. A new product has been formed.
No. Melting is a change of state but no new products have been formed.
Has a chemical reaction taken place in this photo?
Yes. Oxidation. A new product (rush) has been formed.
Yes. Fermentation. A new product has been formed.
No. Melting is a change of state but no new products have been formed.
Which one is a rapid chemical combination of a substance with oxygen?
Oxidation
Fermentation
Combustion
The reddish-brown substance that appears when oxidation takes place is called...
oxygen
rust
iron
Fermentation...
occurs when there is no oxygen and involves microorganisms which transform sugars into organic substances.
is a chemical reaction where a substance changes because oxygen is added.
Oxidation...
occurs when there is no oxygen and involves microorganisms which transform sugars into organic substances.
is a chemical reaction where a substance changes because oxygen is added.
Some clues to know if a chemical reaction has taken place are...
energy change, colour change, change of state.
energy change, colour change, gas formation and change of state.
energy change, colour change, gas formation and precipitate formation.
Look at the photo. This very common sign of a chemical reaction is called...
colour change
precipitate formation
gas formation
Chemical reactions only happen in laboratories.
TRUE
FALSE (they also happen in nature)
