chemical reactions

Question 1

what is corrosion?

Answer 1

corrosion is the gradual destruction of materials by chemical reactions with gases in the environment

Question 2

what is galvanised iron?

Answer 2

galvanised iron is where you coat iron/stainless steel with paint or plastic to prevent rusting

Question 3

what is combustion?

Answer 3

a chemical process in which a substance reacts rapidly with oxygen and gives off heat

Question 4

cellular respiration equation

Answer 4

glucose + oxygen -> carbon dioxide + water

Question 4

exothermic

Answer 4

releases heat, causing the temperature of the immediate surroundings to rise

Question 5

endothermic

Answer 5

absorbs heat and cools the surroundings

Question 6

what is matter?

Answer 6

matter is any substance that had mass and takes up space

Question 7

what is matter made of?

Answer 7

atoms

Question 8

left side of an equations

Answer 8

reactants

Question 9

right side of an equations

Answer 9

products

Question 10

What is the Law of Conservation of Mass?

Answer 10

The atoms of the starting materials (reactants) are rearranged in a chemical reaction to form new, different substances (products).
All of the original atoms are still present.

Question 11

How is mass conserved?

Answer 11

More than one atom/molecule of each reactant/product can be involved in a reaction.

Question 12

Why balance chemical equations?

Answer 12

We write balanced chemical equations to show that mass is conserved.

Question 13

What are decomposition reactions?

Answer 13

In decomposition reactions one single compound breaks down into two or more simpler chemicals.

Question 14

combustion reactions fall into the pattern….

Answer 14

fuel + O2 → CO2 + H2O

Question 15

What are fuels?

Answer 15

Fuels are substances that release a lot of Energy (Heat) when combusted

Question 16

Combustion of Hydrocarbons equation

Answer 16

Hydrocarbon + oxygen → carbon dioxide + water + energy

Question 17

general equation for incomplete combustion is:

Answer 17

hydrocarbon + oxygen → carbon monoxide + carbon + water

Question 18

Incomplete combustion occurs when…

Answer 18

the supply of air or oxygen is poor. Water is still produced, but carbon monoxide and carbon are produced instead of carbon dioxide.

Question 19

How are respiration and combustion similar?

Answer 19

Respiration and combustion are superficially similar - the reactants and products are the same, and both are exothermic.

Question 20

is respiration or combustion faster?

Answer 20

COMBUSTIONNNN!!!!

Question 21

Why is energy released or absorbed?

Answer 21

Energy is stored in the chemical bonds of the reactants and products - chemical potential energy.

Question 22

how are materials produced using chemistry?

Answer 22

Many substances and materials are made using a series of chemical reactions