C1) The Particulate Nature of Matter Flashcards
1
Q
describe particles in a solid [1]
A
- particles only vibrate around fixed positions.
- regular structure.
2
Q
describe particles in a liquid [1]
A
- particles can move around each other.
- collide often.
3
Q
describe particles in a gas [1]
A
- particles move freely and at random in all directions.
- collide less often than in a liquid.
4
Q
explain what happens to temp. during melting [1]
A
- temp stays constant.
- energy is used to weaken the intermolecular forces and change the substance from a solid to a liquid.
5
Q
explain what happens to temp. during boiling [1]
A
- temp stays constant.
- energy is used to weaken the intermolecular forces & change the substance from a liquid to a gas.
6
Q
describe an atom [1]
A
smallest part of an element.
7
Q
describe a molecule [1]
A
a group of atoms covalently bonded together (eg. O2/H20)
8
Q
describe an ion [1]
A
a charged particle (eg. Na+)
9
Q
describe diffusion [1]
A
the process by which different substances mix as a result of the random motion of their particles.
10
Q
explain the factors that affect diffusion [1]
A
- higher temp = faster rate of diffusion.
- ## greater molecular mass = slower rate of diffusion.
