Let's React: Exam revision

Question 1

What is the atomic number?

Answer 1

The number of protons in the nucleus of an atom.

Question 2

What is a proton?

Answer 2

A subatomic particle that has a positive charge and that is found in the nucleus of an atom.

Question 3

What is a neutron?

Answer 3

A subatomic particle that has no charge and that is found in the nucleus of an atom.

Question 4

What is an electron?

Answer 4

A subatomic particle that has a negative charge.

Question 5

What is mass number?

Answer 5

The total number of protons and neutrons in a nucleus of an atom.

Question 6

How many neutrons are in a sodium-23 atom?

Answer 6

12

Question 7

How can the number of neutrons in the nucleus of an atom be calculated?

Answer 7

Mass number - atomic number.

Question 8

How many neutrons are in a chlorine-37 atom?

Answer 8

20

Question 9

What is the electron configuration of a phosphorus atom?

Answer 9

2, 8, 5

Question 10

What is the electron configuration of a calcium atom?

Answer 10

2, 8, 8, 2

Question 11

What is a cation?

Answer 11

Formed when a metal atom loses valence electrons.

Question 12

What is an anion?

Answer 12

An ion with a negative charge.

Question 13

What happens to energy when an electron moves from a higher energy level to a lower energy level?

Answer 13

Energy is emitted.

Question 14

What is the charge on an oxide ion?

Answer 14

2-

Question 15

What is the charge on an aluminium ion?

Answer 15

3+

Question 16

What is the charge on a nitride ion?

Answer 16

3-

Question 17

What is the charge on a magnesium ion?

Answer 17

2+

Question 18

How many electrons are in a sodium ion?

Answer 18

10

Question 19

How many electrons are in a chloride ion?

Answer 19

18

Question 20

What is the formula for sodium hydroxide?

Answer 20

NaOH

Question 21

What is the formula for sodium carbonate?

Answer 21

Na2CO3

Question 22

What is the formula for silver sulfate?

Answer 22

Ag2SO4

Question 23

What is the formula for iron(III) nitride?

Answer 23

FeN

Question 24

How many grams of hydrogen are required to react with 100 g of nitrogen to produce 121 g of ammonia?

Answer 24

21

Question 25

How many grams of water are produced when 16 g of methane reacts with 64 g of oxygen to produce 44 g of carbon dioxide and water?

Answer 25

36

Question 26

What are some evidence of a chemical reaction?

Answer 26

Colour change, bubbles, heat produced.

Question 27

What are coefficients used for in chemistry?

Answer 27

Used to balance chemical equations.

Question 28

What does reaction rate measure?

Answer 28

How quickly reactants are turned into products.

Question 29

What does collision theory state about energy?

Answer 29

For a reaction to occur, particles must collide with the correct orientation and with enough energy.

Question 30

What is a catalyst?

Answer 30

Used to speed up a chemical reaction but is not used up in the reaction.

Question 31

How can reaction rate be increased by increasing surface area?

Answer 31

Crushing a solid is an example.

Question 32

What can increase the reaction rate along with concentration and surface area?

Answer 32

Temperature.

Question 33

What is the atomic number of a sodium atom with 11 protons and 12 neutrons?

Answer 33

11

Question 34

What is the mass number of a sodium atom with 11 protons and 12 neutrons?

Answer 34

23

Question 35

What is the electron configuration of a sodium atom with 11 protons and 12 neutrons?

Answer 35

2, 8, 1

Question 36

What is the charge on the ion formed by sodium?

Answer 36

1+