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Flashcards in Possible Questions Deck (18)
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1

Who put forward the word 'atom' to describe the indivisible particles that make up matter?

Democritus

2

What was Democritus' contribution to chemistry?

He put forward the name 'atom' to describe the indivisible particles that make up matter

3

Who was the first to put forward an atomic theory?

John Dalton

4

What was John Dalton's contribution to chemistry?

He put forward his atomic theory which states;

All matter is made up of very small particles called atoms
All atoms are indivisible. They cannot be broken down into simpler particles

5

Who discovered cathode rays?

William Crookes

6

What was William Crookes' contribution to chemistry?

He discovered cathode rays

7

Who discovered the electron?

J.J Thompson (using Crookes' research)

8

What was J.J Thompson's contribution to chemistry?
(3)

He discovered the electron

He calculated the ratio of the charge of the electron to its mass = charge/mass

Put forward the plum pudding model of the atom

9

Who calculated the ratio of the charge of the electron to its mass?

J.J Thompson

10

Who determined the size of the charge on the electron?

Robert Millikan

11

What was Robert Millikan's contribution to chemistry?
(2)

He determined the size of the charge on the electron

He calculated the mass of the electron

12

Who calculated the mass of the electron?

Robert Millikan

13

Who put forward the plum pudding model of the atom?

J.J Thompson

14

Who discovered the nucleus?

Ernest Rutherford

15

What was Ernest Rutherford's contribution to chemistry?
(2)

He discovered the nucleus

He discovered the proton

16

Who discovered the proton?

Ernest Rutherford

17

Who discovered the neutron?

James Chadwick

18

What was James Chadwick's contribution to chemistry?

He discovered the neutron