Properties and Classification of Matter

Water, table salt, sugar and rust are examples of?

• compounds

• elements

• mixtures

• solutions

Which of the ff. pure substances is correctly matched to its chemical symbol?

• carbon monoxide - CO₂

• iron - I

• silicon - S

• water - H₂O

Table salt is a compound with the chemical name sodium chloride. Which is its chemical symbol?

• CaCO₃

• NaCl

• NaBr

• Mg(OH)₂

Measuring the mass and volume of a piece of chalk is a way of investigating its ____________.

• physical and intensive properties

• physical and extensive properties

• chemical and extensive properties

• chemical and intensive properties

A scientist found that a sample of matter contains three types of atoms. The sample can be any of the following except ___________

• compound

• element

• mixture

• molecule

Which of the following describes a chemical property?

• An iron bar rusts.

• Ice melts when heated.

• The density of iron is 7.87 g/cm³.

• Aluminum is a silver-colored metal.

In identifying a pure substance, which may be its chemical property?

• Its mass is 26.87 g.

• It melts when heated.

• It burns in air.

• It is a good heat conductor.

Which of the following best completes the analogy? air : mixture; ____________:_______________

• atoms : element

• element : compound

• magnesium : element

• solvent : solution

What property do liquids and gases have in common?

• They can flow.

• They have a definite shape.

• They cannot be compressed.

• They have a definite volume.

In choosing a method for the separation of a mixture, what needs to be considered?

• The chemical properties of the substances involved.

• The physical properties of the substances involved.

• The amount of each substance present.

• The cost-effectiveness of the method to be chosen.