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The original substances of a chemical reaction are called products. TRUE OR FALSE?
FALSE. They are called reactants.
New products are always formed from a chemical reaction. TRUE OR FALSE?
TRUE.
We can use simple separation methods, like distillation, to separate
the products of a chemical reaction. TRUE OR FALSE?
FALSE. The new product formed from a chemical reaction can only be separated again by another chemical reaction. Simple separation methods won't work.
What components are needed for combustion to take place? (three)
Oxygen, energy, fuel.
Can you tell me an example of fuel?
Wood/gas/oil
"Condensation forms on a glass on a hot day". HAS A CHEMICAL REACTION TAKEN PLACE?
NO, IT HASN'T. This is a change of state (from gas to liquid).
"Bubbles form when vinegar and baking soda are mixed together". HAS A CHEMICAL REACTION TAKEN PLACE?
YES, IT HAS. Some chemical reactions produce gas (GAS FORMATION).
"Ice cream melts in the sunshine". HAS A CHEMICAL REACTION TAKEN PLACE?
NO, IT HASN'T. This is a change of state (from solid to liquid).
"A glass jar feels warm after two cold substances are mixed together". HAS A CHEMICAL REACTION TAKEN PLACE?
YES, IT HAS. There has been an ENERGY CHANGE (thermal energy).
"A glow stick emits light when it is broken". HAS A CHEMICAL REACTION TAKEN PLACE?
YES, IT HAS. There has been an ENERGY CHANGE (light energy).
"When two liquids are mixed, a blue solid forms at the bottom". HAS A CHEMICAL REACTION TAKEN PLACE?
YES, IT HAS. PRECIPITATE FORMATION is a very common sign of a chemical reaction.
Complete this sentence:
"Both, m_______ and f________ can oxidise producing different results. The product is r_______ ".
1. metals/ 2. food/ 3. rust
Which chemical reaction DOES NOT NEED OXYGEN to occur?
a. Oxidation
b. Fermentation
c. Combustion
b. FERMENTATION
Oxygen is the new product formed by fermentation. TRUE OR FALSE?
FALSE. Carbon Dioxide is the new product formed by fermentation.
"This metal has gone rusty". Rusty is the adjective we use to say that something has got rust.
Can you define "RUST"?
"RUST" is a reddish-brown substance that appears when oxidation takes place (it easily breaks apart and makes the original object useless).
Complete the sentence:
"FERMENTATION is a chemical reaction which involves m____________ which transform s___________ into organic substances".
1. microorgamisms/ 2. sugars
