Yr 9 science Final Exam

Question 1

An element is?

Answer 1

A element is atoms that all have the same number of protons in their nucleus

Question 2

A compound is

Answer 2

A compound is a combination of different elements into a single unit

Give example -water h20 carbon dioxide CO2

Question 3

What is an Atom?

Answer 3

The smallest single unit of an element

Question 4

What is a proton

Answer 4

It’s a tiny particle that has a positive charged particle inside the nucleus

Question 5

Define electron

Answer 5

It’s a negative particle that revolves around the outside of the atoms nucleus

Question 6

A neutron is?

Answer 6

It’s a particle of matter that has no charge

Question 7

A nucleus of an atom contains what?

Answer 7

Protons and neutrons

Question 8

The charge of the nucleus is?

Answer 8

Positive

Because ?
The nucleus of an atom contains protons ( positive charge) and neutrons( no charge ) so the overall charge is positive .

Question 9

Most of the weight of an atom is where?

Answer 9

In the nucleus of the atom

Question 10

Metals are located where on the periodic table

Answer 10

Left side

Question 11

Non metals are located where on the periodic table

Answer 11

Right side

Question 12

Metalloids are located where on the periodic table ?

Answer 12

In between metals and non metals .

Question 13

Define Matter?

Answer 13

Matter is a substance it’s anything that takes up space .
eg:everything around you - people, food, cars etc
All the atoms and molecules around you

Question 14

The size of an atom is determined by what?

Answer 14

The orbit of electrons around the nucleus

Question 15

The atomic number of an atom explains how many protons are in a nucleus true or false

Answer 15

True

Question 16

The atomic mass of an atom is the total number of ?

Answer 16

Protons and neutrons in the nucleus of an atom

Question 17

The early Greek model of the atom was that matter was made of what

Answer 17

Small indivisible units that could not be seen and the smallest piece of matter

Question 18

Ernest Rutherford discovered that the nucleus of atoms was big compared to the size of atom
T or F

Answer 18

False

They were very small compared to the size of atom

Question 19

What is a alpha particle

Answer 19

It is a helium nucleus

Question 20

What does an alpha particle contain

Answer 20

Two protons and two neutrons
Why?
Because it has no electrons it has a charge of 2+

Question 21

What is a beta particle

Answer 21

It is a negatively charged particle

What is it commonly referred to ? A fast moving electron

Question 22

The periodic table lists atoms in order of increasing what?

Answer 22

Atomic number

Question 23

Where on the periodic table is The alkali group?

Answer 23

Group 1

Question 24

Where are the alkaline earths located in the periodic table

Answer 24

Located in group two

Question 25

The noble gases are group 8 in the periodic table. The outer electron shell of noble gases always contains

Answer 25

A gases B a full shell of electrons C a particle D single unit

Question 26

Do the number of electrons and protons in an atom stay the same

Answer 26

True | The negative charge cancels out the positive charge

Question 27

When the number of electrons and protons are not the same it is no longer an atom .. What is it?

Answer 27

An ion

Question 28

Gases are located where on the periodic table

Answer 28

The right side . | The gases in group 8 are known as what? The noble gases

Question 29

How many electrons do the elements in group 1 have?

Answer 29

One electron in the outermost shell

Question 30

Do the elements in group four of the periodic table have four electrons in the outermost shell t or f

Answer 30

True

Question 31

When magnesium is burned in air what new chemical is formed

Answer 31

Magnesium oxide

Question 32

When acid is added to magnesium what gas is produced

Answer 32

Hydrogen What is the test for this gas called ? The pop test , because when hydrogen is captured in a test tube it causes a lit match to pop.

Question 33

When acid is added to calcium carbonate what gas is produced

Answer 33

Carbon dioxide

Question 34

When you add ice to a chemical reaction what happens

Answer 34

It makes the reaction go slower

Question 35

List five ways to increase the speed of a chemical reaction

Answer 35

Heating , pressure, surface area, type of reactants, concentration of reactants

Question 36

The cloud model of an atom is best explained as what?

Answer 36

A small nucleus around which the electrons circulate but there position is unknown

Question 37

Tell ME the difference between a molecule and a compound

Answer 37

A molecule is formed when 2 or more atoms join together chemically A compound is a molecule that has 2 different elements So all compounds are molecules but not all molecules are compounds

Question 38

A neutralisation reaction occurs when what are combined

Answer 38

Equal amount of acid and base

Question 39

Burning a chemical in the presence of oxygen is called a what reaction

Answer 39

A combustion reaction

Question 40

Isotopes of an element are different because of what

Answer 40

Because they have different numbers of protons

Question 41

Why is ionising radiation dangerous

Answer 41

Because it can cause damage to human cells and can result in cancer

Question 42

Radioactivity is the emission of two particles what are the particles

Answer 42

Beta particles and alpha particles Or Gamma waves from an atom

Question 43

The half life of a radioactive element is the time it takes for the radioactivity of the atoms to

Answer 43

A split B half C decay D dance

Question 44

How many number of atoms in a molecule of glucose

Answer 44

24 | 6 carbon, 12 hydrogen, 6 oxygen

Question 45

Neutral solutions have a ph equal to

Answer 45

7

Question 46

Acidic solutions have a ph level of less than

Answer 46

A 4 B7 answer C 8 D 2

Question 47

What solution has a ph level of more than 7

Answer 47

A basic solution

Question 48

A inventor called Mendeleev invented what

Answer 48

The periodic table

Question 49

List 3 common acids

Answer 49

Sulphuric acid, nitric acid, hydrochloric acid

Question 50

List a common base

Answer 50

Sodium hydroxide also known as caustic soda

Question 51

A Geiger counter is used to detect what

Answer 51

Radiation

Question 52

Carbon dating can only be used on what type of materials

Answer 52

On materials that were once living