Worksheet: Compounds and Mixtures

In this worksheet, we will practice defining and identifying compounds and mixtures and using these terms in the context of materials and physical processes.

Q1:

Which of the following is not true for a pure substance?

  • AA pure substance consists of only one type of molecule or unit.
  • BSolutions cannot be pure substances.
  • CPure substances are homogeneous.
  • DAll pure substances contain only one type of atom.
  • EExamples of pure substances include distilled water, nitrogen gas and sodium chloride.

Q2:

Which of the following is true for a homogeneous mixture?

  • AA homogeneous mixture is one where nothing is reacting.
  • BAll the components of a homogeneous mixture are in the same phase.
  • CA homogeneous mixture can never be un-mixed.
  • DThe components of a homogeneous mixture are all evenly distributed.
  • EThe components of a homogeneous mixture are unevenly distributed.

Q3:

Which of the following is not a compound?

  • ACarbon dioxide
  • BMagnesium oxide
  • CHydrogen chloride
  • DOxygen
  • EWater

Q4:

Which one of the following is true for mixtures?

  • AA mixture is always formed when two substances react together.
  • BMixtures can only be made by mixing pure substances together.
  • CPure elements cannot form mixtures.
  • DMixtures consist of particles of different substances mixed—but not reacted—together.
  • EMixtures cannot be separated into their components.

Q5:

Which one of the following is true for compounds?

  • AA compound is formed when different molecules share the same container.
  • BCompounds are made of only one type of atom.
  • CCompounds cannot be separated into their component elements.
  • DCompounds are composed of two or more types of atom bonded together in a fixed ratio.
  • ECompounds are formed when two atoms of the same element join together.

Q6:

Which one of the following is true for a heterogeneous mixture?

  • AA heterogeneous mixture is one in which two or more components are reacting together.
  • BThe components of a heterogeneous mixture exist in a range of phases.
  • CA heterogeneous mixture is one which can be un-mixed.
  • DThe components of a heterogeneous mixture are unevenly distributed.
  • EThe components of a heterogeneous mixture are evenly distributed.

Q7:

Which of the following best describes a compound?

  • AA single atom of an element
  • BAtoms chemically bonded together in a discrete unit
  • CA mixture of different elements
  • DA substance composed of two or more elements, chemically bonded together in a fixed ratio

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