C1 atomic structure

Question 1

Atom

Answer 1

The smallest particle of an element

Question 2

Molecule

Answer 2

Two or more atoms chemically bonded together

Question 3

Element

Answer 3

A substance made up of only one type of atom

Question 4

Compound

Answer 4

Substance made from two or more elements chemically bonded together

Question 5

Mixture

Answer 5

Two or more substances mixed together, but do not react together. A mixture is not a pure substance.

Question 6

Isotope

Answer 6

Atoms of the same element but with different numbers of neutrons.

Question 7

The law of conservation of mass

Answer 7

During a reaction, the atoms in reactants are rearranged into different compounds. Therefore, mass is never gained or lost in a chemical reaction.

Question 8

Separating mixtures

Answer 8

• filtration
• crystallization
• simple distillation
• fractional distillation
• chromatography

Question 9

The history of the atom

Answer 9

• atoms used to be thought as tiny spheres that could not be split

Question 10

The history of the atom

Answer 10

• the discovery of the electron led to the plum pudding model of the atom, which suggested that the atom was a ball of positive charge with negative electrons embedded in it

Question 11

The history of the atom

Answer 11

Later experiments led to the discovery of protons and neutrons

Question 12

The structure of the atom

Answer 12

Subatomic particle, relative charge, relative mass

Proton, +1, 1
Neutron, 0 , 1
Electron, -1, almost 0