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CHEMICAL REACTIONS
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Which chemical reaction can SALT SPEED UP? a. OXIDATION b. FERMENTATION c. COMBUSTION
a. OXIDATION
Which chemical reaction is also known as BURNING? a. OXIDATION b. FERMENTATION c. COMBUSTION
c. COMBUSTION
Which chemical reaction produces LIGHT AND HEAT? a. OXIDATION b. FERMENTATION c. COMBUSTION
c. COMBUSTION
Which chemical reaction is used in order to PRESERVE FOOD? a. OXIDATION b. FERMENTATION c. COMBUSTION
b. FERMENTATION
When we use fermentation to make yoghurt and cheese, do we use FUNGI or BACTERIA?
BACTERIA.
When we use fermentation to make bread or wine, do we use FUNGI or BACTERIA?
FUNGI.
Think about FERMENTATION and complete the sentence: "FUNGI produce a_______ and carbon dioxide. BACTERIA produce l_____ a_____ and carbon dioxide".
1. alcohol/ 2. lactic acid
Complete the sentence: "FERMENTATION is a chemical reaction which involves m____________ which transform s___________ into organic substances".
1. microorgamisms/ 2. sugars
"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).
Oxygen is the new product formed by fermentation. TRUE OR FALSE?
FALSE. Carbon Dioxide is the new product formed by fermentation.
Which chemical reaction DOES NOT NEED OXYGEN to occur? a. Oxidation b. Fermentation c. Combustion
b. FERMENTATION
Complete this sentence: "Both, m_______ and f________ can oxidise producing different results. The product is r_______ ".
1. metals/ 2. food/ 3. rust
"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.
"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).
"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).
"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).
"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).
"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).
Can you tell me an example of fuel?
Wood/gas/oil
What components are needed for combustion to take place? (three)
Oxygen, energy, fuel.
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.
New products are always formed from a chemical reaction. TRUE OR FALSE?
TRUE.
The original substances of a chemical reaction are called products. TRUE OR FALSE?
FALSE. They are called reactants.
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