Chemical Reactions Flashcards
1
Q
Chemical reaction
A
A change which acreages a new substance by arranging atoms
2
Q
Reversible
A
Able tor turn back to original state
3
Q
Catalyst
A
A substance that quickens the chemical reaction without being used up
4
Q
Physical change
A
- a reversible change in which substances are not made but change state
- e.g melting or dissolving
5
Q
Precipitate
A
- a solid that is produced by two liquids reacting together
- usually falls to the bottom of test tube
6
Q
All chemical reactions:
A
- transfer energy to/form surroundings
- create a new substance
- are difficult to reverse
7
Q
Chemical reaction indicators:
A
- fizzing = gas being produced
- change in colour
- odour
- temperature change
- sparks/flames
- precipitate has formed
8
Q
Uses of chemical reactions
A
- medicines = paracetamol
- fabrics = polyester
- building materials = cement
9
Q
Reactant
A
A starting substance in a chemical reaction
10
Q
Product
A
A substance that is made in a chemical reaction
11
Q
Word equation
A
A way of representing a chemical reaction
12
Q
Arrow
A
Reacts to make or give you
13
Q
Hazard
A
A possible source of danger
14
Q
Risk
A
The chance of damage or injury from a hazard
