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Question 1

ions

Answer 1

an atom or group of atoms that have a positive or negative charge which are formed by the loss or gain of an atom.

Question 2

Acid and metal reactions produce

Answer 2

Hydrogen gas and a salt

Question 3

4 types of chemical reactions that can take place

Answer 3

1) Acid + Metal > Hydrogen gas + Salt
2) Acid + hydroxide base>Water + Salt
3) Acid + carbonate base > Water + Salt + Carbon Dioxide
4) Acid + hydrogen carbonate > Water + Salt + Carbon Dioxide

Question 4

acid + metal carbonate reaction equation

Answer 4

Acid + Metal Carbonate >Salt + Carbon Dioxide + Hydrogen

Question 5

Combustion reaction chemical equation

Answer 5

Fuel+Oxygen>carbon dioxide+water

Question 6

Combustion

Answer 6

a reaction in which a substance reacts with oxygen gas, releasing energy in the form of light and heat

Question 7

Complete combustion

Answer 7

when all the oxygen in reactions are used up

Question 8

Why are fuels combustion reactions

Answer 8

they have enough oxygen to make carbon dioxide.

Question 9

combustion reaction equation

Answer 9

fuel + oxygen 🡪 carbon dioxide + water

Question 10

Incomplete combustion

Answer 10

When the air supply is limited, carbon monoxide can be produced instead of
carbon dioxide.

Question 10

Incomplete combustion equation

Answer 10

Fuel + limited oxygen 🡪 carbon monoxide+carbon+water

Question 11

How is carbon released in an incomplete combustion reaction

Answer 11

as a soot(black powder)

Question 11

hydrocarbon

Answer 11

type of compound that combust extremely well.

Question 12

hydrocarbon examples

Answer 12

Coal, petrol, natural gas

Question 13

how are exothermic reactions related to combustion reactions

Answer 13

both reactions release heat

Question 14

why do some fires produce smoke

Answer 14

when there is an incomplete combustion(not enough oxygen to burn the fuel completely)

Question 15

example of complete combustion

Answer 15

Burning candle wax

Question 16

example of an incomplete combustion

Answer 16

burning paper

Question 17

corrosive

Answer 17

ability for a substance to destroy materials every material it comes in contact with,

Question 18

concentration

Answer 18

measure of the amount pf hydrogen ions in an acid or hydroxide ions in a base

Question 19

why is respiration an exothermic reaction

Answer 19

the process of glucose being broken down results in a release of energy.

Question 20

how to be certain 100% that a chemical reaction has taken place

Answer 20

a new substance has appeared

Question 21

when does a chemcialr eaction take place

Answer 21

when the bonds between atoms are broken and new bonds are formed.

Question 22

Some chemical reactions require the supply of energy to get them started. Identify two forms of energy that can be the sources of this energy.

Answer 22

heat or light

Question 22

NaCl

Answer 22

sodim chloride

Question 23

KF

Answer 23

potassium flurorine

Question 24

BeO

Answer 24

Beryllium oxide

Question 25

Q4. Is respiration an endothermic or exothermic reaction, why?

Answer 25

the process of glucose being broken down results in a release of energy.

Question 26

Q4. Is respiration an endothermic or exothermic reaction, why?

Answer 26

the process of glucose being broken down results in a release of energy.

Question 27

MgI 2

Answer 27

Magnesium Iodide

Question 28

FeN

Answer 28

Iron Nitride

Question 29

FeN

Answer 29

Iron Nitride

Question 30

AlP

Answer 30

Aluminium Phosphide

Question 31

Explain what colour red litmus paper changes in the presence of acids, bases and neutral substances.

Answer 31

red litmus paper turns blue in the presence of a base, red in acids and red in neutral substances

Question 32

Give three everyday examples of neutralisation reactions.

Answer 32

indigestion, soil treatment and treatment of ant and bee bites

Question 33

chemical formula for Lithium floride

Answer 33

LiF

Question 34

chemical formula formagnieusm chlride

Answer 34

MgCl

Question 35

respiration equation

Answer 35

oxygen+glucos>carbon dioxide + water

Question 36

respiration equation

Answer 36

oxygen+glucos>carbon dioxide + water

Question 37

what colourdoes red litmus paper turn in the presence of acids, base and neutral substacnes

Answer 37

turns blue in the presence of a base, red in acids and red n neutral substances

Question 38

what colourdoes blue litmus paper turn in the presence of acids, base and neutral substacnes

Answer 38

turns red in the presence of a base, blue n acids and blue in neutral substances

Question 39

what elemtn has electorn configration of 2, 8,1

Answer 39

sodium

Question 40

what has the electron configration of 2,1

Answer 40

lithium

Question 41

what has the elctron configuration of 2,8,8,2

Answer 41

calcium

Question 42

how does antigen and antibody compelx work

Answer 42

molecule that is formed by the bonding of multiple antigens to antibodies

Question 43

where are B and T cells produced

Answer 43

bone marrow and in the thymus

Question 44

what number and charge is sodium,lithium and calcium likely to form

Answer 44

sodium-1 positive cation lithium-1 positive cation calcium- 2 positive cations

Question 44

when is a cation formed and an anion

Answer 44

cation formed when an atom loses an electron anion formed when an electron is added toatom

Question 45

state whether the reaction between sodium hydrogen carbonate and ethanoic is an exo or endothermic reaction and why.

Answer 45

endothermicreaction because there is a temperature decrease. In thischemical change, heat was absorbed which meant the surrounding cooler.