CHEMICAL REACTIONS

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.

Tags

NGSS.MS-PS1-2

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)