Chemistry 1 11-20 Flashcards
1
Q
- If something has gained electrons, what
charge will it have?
A
negative
2
Q
- How can you calculate the number of
neutrons in an atom?
A
Mass number-atomic number
3
Q
- Describe Dalton’s atomic theory
A
He described atoms as tiny particles which
make up matter, which cannot be split.
4
Q
- Describe Thomson’s atomic theory
A
In his plum-pudding model, he described
atoms as spheres of positive charge with
electrons dotted around inside
5
Q
- Describe Rutherford’s atomic theory
A
He suggested that the atom has a
positively charged nucleus with electrons
orbiting around.
6
Q
- What did Bohr do?
A
He realised that electrons occupy fixed
energy levels around the nucleus.
7
Q
- What do we call the change of state
that occurs when a solid changes to a liquid?
A
Melting
8
Q
- What do we call the change of state
that occurs when a liquid changes to a
solid?
A
Freezing
9
Q
- What do we call the change of state
that occurs when a liquid changes to a
gas?
A
Evaporation/ boiling
9
Q
- What do we call the change of state
that occurs when a gas changes to a
liquid?
A
condensation
