Topic 1 - The basics

Which word best describes this picture?

• Element

• Compound

• Mixture

• Pure substance

Which description best describes this picture?

• Compounds

• Mixtures

• Molecules

• Atoms

When atoms gain or lose electrons the form?

• elements

• mixtures

• cations

• ions

In chemistry what is a mole?

• 6.02 x 10²³

• a furry creature

• an unfortunately large freckle

• 12

If I have half a mol of water molecules how many do I have?

• 6.02 x 10²³ molecules

• 6.02 x 10¹¹ molecules

• 6.02 x 10¹² molecules

• 3.01 x 10²³ molecules

If I have two mol of oxygen atoms how many atoms do I have?

• 16

• 1.20 x 10²⁴

• 6.02 x 10²³

• 3.01 x 10²³

What is the (rounded) molar mass of NH₃?

• 17 g mol^-1

• 12 g mol^-1

• 20 g mol^-1

• 29 g mol^-1

What is the (rounded) molar mass of ethanoic acid, CH₃COOOH?

• 60 g mol^-1

• 20 g mol^-1

• 64 g mol^-1

• 224 g mol^-1

The correct formula for sodium sulfate is?

• NaSO₄

• Na₂SO₄

• SOSO₄

• Na₂S

The correct formula for potasium sulfide is?

• KS

• K₂S

• KS₂

• SK