C2 - The Periodic Table

Question 1

What is a compound?

Answer 1

Two or more elements which are chemically bonded.

Question 2

What is a mixture?

Answer 2

Two or more substances which are 𝗡𝗢𝗧 chemically bonded.

Question 3

List the methods of separating mixtures

Answer 3

Filtration, Evaporation, Distillation, Fractional distillation, Crystallisation, Chromatography. As these do not include chemical reactions and no new substances are made.

Question 4

List the names of scientists who helped develop the model of the atom (in chronological order)

Answer 4

John Dalton, J.J. Thomson, Ernest Rutherford, Niels Bohr, James Chadwick

Question 5

What did John Dalton do?

Answer 5

Developed the Solid Sphere Model: Atoms are indivisible, indestructible particles, each element having its own kind of atom.

Question 6

What did J.J Thomson do?

Answer 6

Proposed the Plum Pudding Model: Atoms are composed of negatively charged electrons embedded in a positively charged sphere.

Question 7

What did Ernest Rutherford do?

Answer 7

Developed the Nuclear Model: Discovered the nucleus, a dense positive center, with electrons orbiting around it.

Question 8

What did Niels Bohr do?

Answer 8

Proposed the Bohr Model: Electrons orbit the nucleus in fixed energy levels or shells.

Question 9

What did James Chadwick do?

Answer 9

Discovered the neutron, completing the understanding of the atomic nucleus as containing both protons and neutrons.