Chemical Reactions Flashcards
1
Q
When a chemical reaction occurs a what is formed
A
New substance
2
Q
This is what to reverse
A
Difficult to reverse
3
Q
Sings of a chemical reaction
A
Colour change, gas being given off, heat, light, sound, energy, temperature,physical changes
4
Q
Physical changes are what to reverse
A
Easy to reverse
5
Q
A new substance is
A
Not formed
6
Q
An element
A
Can not be broken down
Defined by their atomic number
7
Q
Periodic table
A
Over 100 elements
2 groups
Metals and non metals
8
Q
Atomic number
A
Number of protons
Atom is neutral
Atomic number is equal to number of electrons
9
Q
Mass number
A
Number of protons plus the number of neutrons
