Wk 2 - Categories of substances and separation techniques

Which is an example of a homogenous mixture?

• Molten sodium metal

• Cloudy apple juice

• Carbon dioxide gas

• Salt water

Which is an example of an elemental substance?

• Molten sodium metal

• Cloudy apple juice

• Carbon dioxide gas

• Salt water

Which is an example of an heterogeneous mixture?

• Molten sodium metal

• Cloudy apple juice

• Carbon dioxide gas

• Salt water

Which is an example of a pure compound substance?

• Molten sodium metal

• Cloudy apple juice

• Carbon dioxide gas

• Salt water

How would you separate a salt water mixture into its components?

• Crystallisation

• Distillation

• Filtration

• Decantation

How would you separate a sand and water mixture into its components (multiple answers)?

• Crystallisation

• Distillation

• Filtration

• Decantation

What property of a substance do the separation techniques of filtration and decantation rely on?

• Boiling point

• Solubility

• Conductivity

• Melting point

Which of the following about the solubility of substances is true (multiple answers)?

• Solutions that are saturated with a solid solute will form crystals when cooled.

• All ionic substances are soluble in water.

• Solubility increases as temperature increases.

• White solutes dissolve to form coloured solutions.

What do a metal and non-metal element chemically bond together to form?

• Pure substance

• Covalently bonded molecule

• Ionic substance

• Element

What do two non-metal elements chemically bond together to form?

• Pure substance

• Covalently bonded molecule

• Ionic substance

• Element