Fuels, Atoms + Water Hardness

Question 1

advantages of hard water

Answer 1

good for brewing and tanning

healthy bones and teeth

Question 2

disadvantages of hard water

Answer 2

wastes soap and produces scum

damages water pipes and limescale gets on glasses and cutlery

Question 3

fuel

Answer 3

substance that burns in oxygen to produce heat

Question 4

fossil fuel

Answer 4

fuels that were formed from the remains of plants and animals that lived millions of years ago

Question 5

give two examples of fossil fuels

Answer 5

peat
oil
coal
natural gas

Question 6

hydrocarbons

Answer 6

compounds made of hydrogen and carbon

Question 7

which greenhouse gases cause the earth to warm-up

Answer 7

carbon dioxide

methane

Question 8

two types of acid rain

Answer 8

sulfuric acid

nitric acid

Question 9

what are the dangers of acid rain

Answer 9

poison fish
damages trees
attacks limestone buildings and statues

Question 10

atom

Answer 10

the smallest part of an element which still has the properties of that element

Question 11

atomic number

Answer 11

number of protons

is the smaller of the two numbers with an element in the periodic table

Question 12

mass number

Answer 12

number of protons and neutrons in an atom

Question 13

isotope

Answer 13

atom with the same atomic number but different mass number

Question 14

hard water

Answer 14

does not easily form a lather of soap

Question 15

how could hardness be removed

Answer 15

ion-exchange resin
distillation
boiling