River water is filtered then sterilised to make drinking water. Why is it filtered?

• kills bacteria
• removes solids
• removes dissolved salts
• adds chlorine
• removes germs

River water is filtered then sterilised to make drinking water. Why is it sterilised?

• kills bacteria
• removes solids
• removes dissolved salts
• adds chlorine
• removes germs

Why is distilling sea water to make drinking water expensive?

• uses a lot of chemicals
• it's slow
• needs expensive equipment
• takes lots of time
• takes a lot of energy

Give a difference between pure and potable water?

• Pure water is suitable for drinking
• Potable water contains dissolves solids & chlorine
• Pure water contains dissolved solids & chlorine
• Potable water is not safe to drink

The percentage by mass of dissoved solids in a 12g sample is 3.4%. What is the mass to 2sf?

• 0.40g
• 42g
• 0.41g
• 0.408g
• 42.3g

Give an advantage of recycling copper ore

• Increases greenhouse gases
• More jobs for miners
• Increases landfill
• Conserves copper ore
• Requires more energy

Which of these is a reason for using paper bags over plastic?

• Stronger
• Stretchier
• Renewable resource
• Non-recyclable
• Non-biodegradable

Which of these is a way of conserving limited resources?

• Reverse
• Release
• Reverse
• Reuse
• Repair

Which is a method of water treatment?

• Anaerobic digestion
• Cracking
• Electrolysis
• Phytomining
• Desalination

Which is not a reason why iron should be recycled?

• saves resources
• saves energy
• decreases waste
• decreases CO2 released
• quicker