Year 9 Core Knowledge

Question 1

What are state symbols used for?

Answer 1

To show the physical state of reactants and products in a reaction.

Question 2

What is the state symbol for a solid?

Answer 2

(s)

Question 3

What is the state symbol for a liquid?

Answer 3

(l)

Question 4

What is the state symbol for a gas?

Answer 4

(g)

Question 5

What is the state symbol for an aqueous?

Answer 5

(aq)

Question 6

Aqueous

Answer 6

A substance dissolved in water.

Question 7

Polymer

Answer 7

A substance of high relative formula mass made up of small repeating units known as monomers.

Question 8

Nanoparticles

Answer 8

Nanoparticles are structures that are 1-00nm in size, of the order of a few hundred atoms.

Question 9

Isotopes

Answer 9

Forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei.

Question 10

Covalent bond

Answer 10

A bond formed between non-metal atoms by sharing the outer electrons

Question 11

Ionic bond

Answer 11

An ionic bond is a bond formed when metal atoms donate their outer shell electron(s) to the outer shell of non-metal atoms forming oppositely charged ions, which are attached by electrostatic forces.

Question 12

How many types of subatomic particles do atoms contain?

Answer 12

3

Question 13

What are the three subatomic particles in an atom?

Answer 13

Protons, neutrons and electrons

Question 14

Relative atomic mass

Answer 14

The number of protons and neutrons in the atom.

Question 15

Atomic number

Answer 15

How many protons there are in the atom.

Question 16

How many electrons can fit into the 1st shell?

Answer 16

2

Question 17

How many electrons can fit into the 2nd shell?

Answer 17

8

Question 18

How many electrons can fit into the 3rd shell?

Answer 18

8

Question 19

What is the purpose of balancing equations?

Answer 19

The purpose of balancing equations is to have the same number of each type of atom on both sides of the equation (an equal number of reactant and product atoms).