atomic structure and the periodic table

Question 1

what does soluble mean?

Answer 1

it can be dissolved in water

Question 2

what is a solvent?

Answer 2

a solution able to absorb another

Question 3

what does abundance mean?

Answer 3

a lot of

Question 4

what is the purpose of filtration?

Answer 4

to separate an insoluble solid from a solution

Question 5

what is the purpose of distillation?

Answer 5

to separate a solvent from a solution

Question 6

what is the purpose of fractional distillation?

Answer 6

to separate substances with varying boiling points

Question 7

what is the purpose of crystallisation?

Answer 7

to separate a soluble solid from a solution

Question 8

what is the purpose of chromatography?

Answer 8

to separate soluble coloured compounds

Question 9

what was the plum pudding model and who devised it?

Answer 9

j. j thompson - it was a mode of the atom
- the mass and positive charge was evenly distributed
- with negative charge embedded like plums in a plum pudding

Question 10

what was the nuclear model and who devised it?

Answer 10

rutherford - it was a model of the atom

• the mass and charge was concentrated in a very small, dense nucleus in the centre
• most of the atom was empty space

Question 11

how did the results of the gold foil experiment dictate the nuclear model?

Answer 11

most of the alpha particles went straight through - most of the atom is mostly empty space

some of the particles were deflected at large angles - the mass is concentrated in the centre in a positively charged nucleus ( because positive charges repel )

very few came straight back - the mass is concentrated in a very small space in the centre of the atom ( because the chance of hitting it was very small )

Question 12

what is the relative mass of an electron?

Answer 12

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