Topic 6 Chemical Reactions

Question 1

What are the products of a chemical reaction?

Answer 1

The results of a chemical reaction.

Question 2

What is a chemical bond?

Answer 2

The force of attraction between the ATOMS in a compound.

Note: these are not IMF!

Question 3

What is a chemical change?

Answer 3

A chemical change is the name for when the atoms in a compound are changed through a chemical reaction. These molecules will have new properties.

Question 4

How can you tell if a chemical reaction occurs?

Answer 4

There could be:
A colour change
Bubbles or fizzing
It feels hot or cold
A smell

Question 5

How can we represent a chemical reaction?

Answer 5

By using an equation.

Question 6

What symbols do we use the most in chemical reactions?

Answer 6

➕combined

➡️ chemical reaction

Question 7

What is a monatomic element?

Answer 7

An element, the atoms of which travel alone. Most elements are monatomic, except for the diatomic elements.

Question 8

What kinds of chemical equations can you get?

Answer 8

Word equations

Chemical equations

Question 9

What are the reactants in a chemical reaction?

Answer 9

The ‘ingredients’ in a chemical reaction.

Question 10

What is a word equation?

Answer 10

Use words:

Carbon+Oxygen➡️Carbon dioxide

Question 11

What is a chemical equation?

Answer 11

Use formulae:

C+O➡️CO

Question 11

What is the chemical equation for the neutralisation of stomach acid?

Answer 11

Hydrochloric acid+magnesium hydroxide➡️magnesium chloride+water

Question 12

What is the chemical equation for the burning of fuels?

Answer 12

Octane+oxygen➡️carbon dioxide and water

Question 14

What is the chemical equation for fermentation?

Answer 14

Sugar+yeast➡️alcohol+carbon dioxide

Question 16

What elements can be found in an octane?

Answer 16

Carbon and hydrogen

Question 17

What do we call the process of chemical reactions?

Answer 17

Bonding

Question 18

What happens during a chemical reaction?

Answer 18

The chemical bonds between the atoms break, and the atoms rearrange to form new bonds.

Question 19

What happens to elements in a chemical reaction?

Answer 19

They only rearrange, none of them disappear and no new elements will be in the products.

Question 20

What is the word equation for fireworks?

Answer 20

Sulfur+oxygen➡️sulfur dioxide

Question 21

What happens when you place an egg in white vinegar?

Answer 21

Bubbles will appear. If the egg is left the shell will completely disappear and there will be a slight colour change.

Question 22

What is the word equation for the egg and vinegar reaction?

Answer 22

Vinegar(acetic acid)+calcium carbonate➡️water+carbon dioxide+carbonic acid

Question 23

What are useful chemical reactions?

Answer 23

Fermentation
Neutralisation of stomach acid
Burning fuels

Question 24

Why is fermentation useful?

Answer 24

It makes beer

Question 25

Why is burning fuels useful?

Answer 25

We use the energy to power cars

Question 26

Why is the neutralisation of stomach acids useful?

Answer 26

It stops indigestion

Question 27

What is the word equation for rust?

Answer 27

Moisture | Iron+oxygen➡️➡️➡️➡️➡️➡️➡️➡️iron oxide

Question 28

What careers can be found in chemistry?

Answer 28

Mining, engineering and in development of materials.

Question 29

Where do we mine minerals from?

Answer 29

Rocks in the earth called ores

Question 30

How do we extract iron from ores?

Answer 30

We react rock that contains iron with carbon in a blast furnace at very high temperatures.

Question 31

What is the word equation for the extraction of iron from iron ore?

Answer 31

Iron oxide+carbon➡️carbon dioxide+iron

Question 32

What are chemical engineers involved in?

Answer 32

In developing products and in making and designing substances.

Question 33

What are plastics made out of?

Answer 33

Polymers

Question 34

How are plastics recycled?

Answer 34

Scientists use chemical reactions to recycle polymers.

Question 35

What are renewable bio fuels?

Answer 35

They are fuels that are made from organic materials.

Question 36

What are examples of bio fuels?

Answer 36

Ethanol and bio diesel

Question 37

How is ethanol made?

Answer 37

Yeast reacts with a sugar solution to make ethanol and carbon dioxide

Question 38

How is bio diesel made?

Answer 38

From soybeans and other natural oils

Question 39

What happens when a ballon filled with hydrogen is ignited in the presence of oxygen?

Answer 39

There is a loud pop, and an explosion/fire ball

Question 40

What is the word equation for water?

Answer 40

Hydrogen+oxygen➡Dihydrogen monoxide