Elements and Compounds Science in Action video Quiz

What was the main argument about in the introduction?

• The ingredients of a cake

• The best type of metal

• The purity of different drinks

• The best way to launch a boat

What are elements described as in the video?

• A type of drink

• The building blocks of everything

• A type of metal

• A type of compound

What happens when elements combine chemically?

• They form a compound

• They remain the same

• They become a mixture

• They disappear

What is the compound formed by sodium and chlorine?

• Sodium oxide

• Chlorine dioxide

• Sodium chloride

• Sodium carbonate

What is the most precious metal mentioned in the video?

• Gold

• Iron

• Copper

• Lead

How is pure gold separated from other minerals?

• By crushing the rock and using a shaking table

• By boiling the rock

• By using magnets

• By dissolving the rock in water

What is lead oxide?

• A compound of lead and oxygen

• A type of water

• A pure metal

• A type of gold

What is required to separate lead from oxygen in lead oxide?

• Electricity

• Heat and carbon

• Magnets

• Water and salt

What are the two gases released during the electrolysis of water?

• Hydrogen and oxygen

• Carbon dioxide and oxygen

• Nitrogen and hydrogen

• Helium and oxygen

Why is there twice as much hydrogen as oxygen in water?

• Because water is made of two hydrogen particles for every one oxygen particle

• Because hydrogen is lighter

• Because oxygen evaporates faster

• Because hydrogen is more reactive