Particles - The Particle Model

Question 1

How are liquid particles arranged?

Answer 1

Liquid particles mostly touch and continually move in a random arrangement and are loosely packed together

Question 2

How are gas particles arranged?

Answer 2

The particles in a gas are widely spaced and are randomly arranged

Question 3

How are solid particles arranged?

Answer 3

Particles in a solid are arranged in a regular way and fixed position.

Question 4

How do you find the ratio?

Answer 4

Distance between atoms/diameter of atoms

Question 5

Limitations of a particle model:

Answer 5

1. The movement of the particles
2. The forces between the particles
3. The size and space between the particles

Question 6

What is physical change?

Answer 6

A physical change involves a change in physical properties, and no new products are formed and is easily reversible.

Question 7

What is a chemical change?

Answer 7

A chemical change is when a substance combines with another to form a new substance. It is irreversible and a produces one or more new products.

Question 8

Signs of a chemical reaction:

Answer 8

1. Temperature change
2. Colour change
3. Formation of a precipitate
4. Gas production
5. Odour given out
6. Change in PH

Question 9

What is the diameter of the nucleus of the atoms?

Answer 9

2 × 10 ^-15 m

Question 10

What is the diameter of the atoms?

Answer 10

1 × 10 ^-10 m

Question 11

What is an element?

Answer 11

It is a substance made up of only one type of atom

Question 12

What is an atom?

Answer 12

The smallest part of an element that can exist

Question 13

What are neutrons, protons and electrons known as?

Answer 13

Subatomic particles