Share Chemical reactions
Save to Folder
What is a Chemical Reaction?
It is a process where atoms or molecules (Reactants) change or rearrange their links to form a new substance (product).
Name the 3 chemical reaction we have seen:
Combustion, oxidation and fermentation.
What is oxidation?
It is a chemical reaction where a substance change because oxygen is added.
How can we know that a chemical reaction is taking place?
Energy change, colour change, gas formation and precipitation formation.
I mix to white liquids and I get a solid at the bottom, how can I know that a chemical reaction is happening??
Because there is a precipitation formation
I mix to clear liquids and I get a blue solution, how can I know that a chemical reaction is happening??
Because there is a colour change.
I mix two liquids and I move them getting a solid at the bottom that is hot, how can I know that a chemical reaction is happening??
Because there is a precipitation formation and an energy change.
I mix two substances and I get some foam and it smells like chocolate, how can I know that a chemical reaction is happening??
Because there is a gas formation.
What are the three elements needed in combustion?
Oxygen, fuel and thermal energy or heat.
What are the products that I can get after fermentation?
Carbon dioxide, alcohol and lastic acid.
What is an endothermal reaction?
It is a reaction where the products are colder than the surrounded and absorbs heat.
What is an exothermal reaction?
It is a reaction where the products are hotter than the surrounded and release heat.
The original substances of a chemical reaction are called products. TRUE OR FALSE
FALSE
The atoms in the new product of a chemical reaction are not chemically linked. TRUE OR FALSE
FALSE
We cannot use simple separation methods, like distillation, to separate the products of a chemical reaction. TRUE OR FALSE
TRUE
Microorganisms, oxygen and thermal energy can cause chemical reactions to take place. TRUE OR FALSE
TRUE
