Term 1 Chemistry

Question 1

What is the order of electron shells?

Answer 1

2,8,8,8

Question 2

Why are Group 1 elements so reactive with group 7?

Answer 2

Group 1 elements have a single electron on their outer shell and Group 7 elements are missing one electron on their outer shell.

Question 3

Reactivity in Group 1 _______ as you go down

Answer 3

Increases

Question 4

Reactivity in Group 7 _______ as you go down

Answer 4

Decreases

Question 5

What are the relative charges of Protons, Neutrons and Electrons

Answer 5

Proton: +1
Neutron: 0/Neutral
Electron: -1

Question 6

What is the relative mass of a Proton, Neutron and Electron

Answer 6

Proton: 1
Neutron: 1
Electron: Almost 0

Question 7

Where are the Protons, Neutrons and Electrons found in the atom

Answer 7

Proton: Nucleus
Neutron: Nucleus
Electron: Energy levels

Question 8

What are Isotopes

Answer 8

Atoms of the same element which have the same number of protons but a different number of neutrons

Question 9

What is relative atomic mass

Answer 9

The average mass of an element compared to a standard mass

Question 10

Which is the mass number?

Answer 10

The larger number (usually at the top.) Take away the atomic number and you’ll get the number of neutrons

Question 11

Which is the atomic number?

Answer 11

The smaller number (usually at the bottom or below the element symbol.) The atomic number is equal to the number of protons AND electrons

Question 12

Describe the plum pudding model of the atom

Answer 12

The plum pudding model is a model of the atom that says there is a large positive charge around the atom inside of which there are negative charges (we’d call these electrons.)

Question 13

Describe the atomic model of the atom

Answer 13

The atomic model is the model that we use today. It has a nucleus made of neutrons and protons surrounded by orbital electrons in electron shells

Question 14

Will and atom have an overall charge?

Answer 14

No!!!!!! The electrons and protons are balanced so 10 electrons (negatively charged) plus 10 protons (positively charged) will equal an overall charge of 0

Question 15

Name 4 ways to separate mixtures

Answer 15

Crystallisation, Distillation, Chromatography and Evaporation

Question 16

What is crystallisation?

Answer 16

Crystallisation uses the natural evaporation of liquids to increase the saturation of a mixture until the point of crystallisation when solids begin to form

Question 17

What is filtration

Answer 17

A solution containing an insoluble solid is poured over a fine mesh (filter paper) that catches the solid particles and let’s the solvent pass through

Question 18

What is chromatography

Answer 18

Paper Chromatography is used when separating coloured mixtures. A dot of the mixture is placed on chromatography paper in the middle of the strip. The end of the paper is placed into a solvent that is drawn up the paper and dissolves the different substances differently meaning some get pulled up faster than others.