2.2.1a - Matter - 4

Question 1

Matter is used to describe ….

Answer 1

everything, which occupies space and has mass

Question 2

Liquids have a definite _____ but no regular _____

Answer 2

volume

shape

Question 3

It is possible to change the ‘state of matter’ of most substances by changing the ______ or _____

Answer 3

temperature or pressure

Question 4

In general, the point at which a liquid-to-gas or a gas-to-liquid change takes place, depends mainly on ______

Answer 4

temperatures

Question 5

An atom is the _____ _____ ______ of an _____ which retains the properties of that ______

Answer 5

smallest possible particle

element

element

Question 6

Every uncharged atom has the same number of ______ as _____

Answer 6

protons

electrons

Question 7

The number of _____ in an atom defines which element it is

Answer 7

protons

Question 8

Almost all of an atom’s mass is concentrated in the _____

Answer 8

nucleus

Question 9

If all the atoms in a molecule are the same, then the substance is an ______. If some are different, then the substance is a _____

Answer 9

element

compound

Molecules 02 or H20

Element vs compound

Question 10

There is a direct relationship between the temperature of a substance and the motion energy of its molecules. Temperature then is in fact a measure of this _____ _____

Answer 10

molecular activity

Question 11

Consider what happens when a solid melts. As heat is applied, the molecules vibrate _____ and ______, and they tend to break away from the rigid structure they were held in. When a solid is heated enough, its molecules develop so much ______ that the rigid, solid structure breaks down and the solid melts to a liquid

Answer 11

more

more

vibration

Question 12

A mixture is simply a mingled mass of two or more substances where each substance …..

Answer 12

retains its own individual characteristics

eg salt and pepper

Question 13

compounds have fixed ______ of _____

Answer 13

ratios of elements

water is always h20

Question 14

What are the three states of matter

Answer 14

solid

liquid

gas

Question 15

Gases have no definite shape or volume because

Answer 15

Gas particles are free and have no bonds between them

Question 16

The atoms in a solid …. about their position

Answer 16

are fixed by strong bonds

Question 17

Which is the lightest known element?

Answer 17

Hydrogen

One proton, one electron

no neutron

Question 18

Name the three sub-atomic particles

Answer 18

electron

neutron

proton

Question 19

Which sub atomic particle defines the element?

Answer 19

proton

Question 20

which is the lightest sub-atomic particle?

Answer 20

electron