Test Q&A

Question 1

What is an atom?

Answer 1

Tiny particles of matter that have a mass

Question 2

What is an element?

Answer 2

A substance made from atoms with the same number of protons

Question 3

What are the symbols for the following elements?
Sodium
Hydrogen
Lithium
Copper
Potassium
Argon
Calcium

Answer 3

Sodium - Na
Hydrogen - H
Lithium - Li
Copper - Cu
Potassium - K
Argon - Ar
Calcium - Ca

Question 4

What are the mass of protons, neutrons and electrons?

Answer 4

Protons - 1
Neutrons - 1
Electrons - 0.0005

Question 5

What are the charges of protons, neutrons and electrons?

Answer 5

Protons - positive
Neutrons - no charge
Electrons - Negative

Question 6

Why do atoms have no overall electric charge?

Answer 6

Number of (positive) protons is the same to the number of (negative) electrons.

Question 7

What does the atomic number tell you?

Answer 7

The number of protons in an atom.

Question 8

What does the mass number tell you?

Answer 8

The number of protons and neutrons in an atom.

Question 9

What is a period?

Answer 9

A row across the periodic table.

Question 10

Why do elements in the same group of the periodic table have similar properties?

Answer 10

They have the same number of electrons on their outer shell.

Question 11

What is the word and chemical equation for Calcium Carbonate?

Answer 11

Calcium Carbonate = Calcium Oxide + Carbon Dioxide

CaCO3 = CaO + CO2

Question 12

How many of each element is in Calcium Carbonate? (CaCO3)

Answer 12

1 Calcium
1 Carbon
3 Oxygens
(1 Calcium and Oxygen in Calcium Oxide, 1 Carbon and 2 Oxygens in Carbon Dioxide)

Question 13

Why does calcium chloride, an ionic compound, have a high melting point?

Answer 13

It has strong attractions between the ions

Question 14

Why is oxygen a gas at room temperature?

Answer 14

Forces between the molecules are weak

Question 15

What is a polymer?

Answer 15

Molecules made up of long chains of covalently bonded carbon atoms

Question 16

What is an ion?

Answer 16

A charged particle

Question 17

What type of bonding occurs between metals and non-metals?

Answer 17

Ionic bonding

Question 18

What type of bonding occurs between 2 non-metals?

Answer 18

Covalent bonding

Question 19

Where in the periodic table are the transition metals?

Answer 19

Middle section.

Question 20

What does malleable mean?

Answer 20

Can be bent into shape

Question 21

What properties of copper make it good for electrical wiring?

Answer 21

Very good conductor of electricity and not very reactive.

Question 22

What properties of copper make it good for plumbing?

Answer 22

Easily bent into shape and not very reactive.

Question 23

What is the relative mass of a neutron?

Answer 23

1

Question 24

What is an atoms mass number?

Answer 24

Number of protons and neutrons in an atom.

Question 25

What is an isotope?

Answer 25

A different form of an element with the same number of protons but a different number of neutrons

Question 26

What are fullerenes?

Answer 26

Molecules of carbon shaped like closed tubes or hollow balls.

Question 27

Describe the basic structure of graphite

Answer 27

3 covalent bonds, arranged in hexagons, no covalent bonds between layers, delocalised electrons

Question 28

Describe the basic structure of diamond

Answer 28

4 covalent bonds, strong covalent bonds, no free electrons

Question 29

Why are fullerenes good industrial catalysts?

Answer 29

Have a huge surface area

Question 30

What is chromatography used for?

Answer 30

A method to separate a mixture of soluble substances and to identify them

Question 31

Name 3 different sources of water that can be made portable

Answer 31

Surface water, ground water and waste water

Question 32

What is deionised water?

Answer 32

Has had the ions present in tap water (such as calcium and copper) removed

Question 33

What is the chemical definition of purity?

Answer 33

A substance made up of a single element or compound

Question 34

Describe how to carry out filtration

Answer 34

Used when the product is from an insoluble solid, using filter paper and a funnel you can separate the solid from a liquid. The liquid runs through and the solid is left behind in the filte paper.

Question 35

What separation technique should you use to separate a soluble solid from a solution?

Answer 35

Crystallisation

Question 36

What happens to the forces between the particles on a solid as you melt it?

Answer 36

Particles gain more energy, increases vibrations and weaken the forces

Question 37

What is the pH of a neutral substance?

Answer 37

7

Question 38

What is the pH value of an acid substance?

Answer 38

Anything from 1-6