Understanding Matter and Its Properties

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 combination of two or more substances

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

• Sand and water

• Oil and water

• Salt dissolved in water

• A salad

Which technique would you use to separate a mixture of sand and iron filings?

• Filtration

• Evaporation

• Magnetic separation

• Distillation

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 are made of only one type of atom, elements are not

Which of the following is a chemical formula?

• Water

• Salt

• Sugar

What is the particle model used for?

• To describe the colour of substances

• To model and explain the properties of matter

• To measure the temperature of substances

• To calculate the weight of substances

Which separation technique is best for obtaining pure water from saltwater?

• Filtration

• Decantation

• Distillation

• Crystallisation

What does a heterogeneous mixture look like?

• It has a uniform appearance throughout

• It has a non-uniform appearance with distinct parts

• It is always a liquid

• It is always a gas

Which of the following is an example of a compound?

• Helium (He)

What is the symbol for the element gold?

• Au

• Ag

• Gd

• Go