7ALP - Understanding Matter and Its Properties (level 7&8)

What is a pure substance?

• A mixture of different elements and compounds

• A substance made of only one type of particle

• A substance that can be separated by physical means

• A substance with a non-uniform composition

Which of the following is an example of a homogeneous mixture?

• Sand and water

• Oil and water

• Salt dissolved in water

• Iron filings and sulphur

Which separation technique would you use to separate sand from water?

• Filtration

• Distillation

• Chromatography

• Crystallisation

What is the main difference between an element and a compound?

• Elements are made of different types of atoms, compounds are not

• Compounds can be broken down into simpler substances, elements cannot

• Elements can be separated by physical means, compounds cannot

• Compounds have a uniform composition, elements do not

Which of the following is a representation of a molecule?

• All of the above

What does the particle model of matter describe?

• The chemical properties of substances

• The arrangement and motion of particles in a substance

• The colour and texture of substances

• The ability of substances to conduct electricity

Which of the following is a characteristic of a heterogeneous mixture?

• Uniform composition throughout

• Can be separated by magnetic separation

• Non-uniform composition

• Cannot be separated by physical means

What is the symbol for the element Oxygen?

• O

• Ox

• Oy

• Om

Which technique is used to separate a soluble solid from a liquid?

• Filtration

• Evaporation

• Magnetic separation

• Decantation

What is the chemical formula for table salt?