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?

  • ASolutions cannot be pure substances.
  • BA pure substance consists of only one type of molecule or unit.
  • CAll pure substances contain only one type of atom.
  • DExamples of pure substances include distilled water, nitrogen gas, and sodium chloride.
  • EPure substances are homogeneous.

Q2:

Which of the following is true for a homogeneous mixture?

  • AA homogeneous mixture is one where nothing is reacting.
  • BThe components of a homogeneous mixture are unevenly distributed.
  • CThe components of a homogeneous mixture are all evenly distributed.
  • DA homogeneous mixture can never be unmixed.
  • EAll the components of a homogeneous mixture are in the same phase.

Q3:

Which of the following is not a compound?

  • AMagnesium oxide
  • BCarbon dioxide
  • CHydrogen chloride
  • DOxygen
  • EWater

Q4:

Which of the following is true for mixtures?

  • APure elements cannot form mixtures.
  • BMixtures consist of particles of different substances mixedβ€”but not reactedβ€”together.
  • CA mixture is always formed when two substances react together.
  • DMixtures cannot be separated into their components.
  • EMixtures can only be made by mixing pure substances together.

Q5:

Which one of the following is true for compounds?

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

Q6:

Which 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 are evenly distributed.
  • CThe components of a heterogeneous mixture are unevenly distributed.
  • DA heterogeneous mixture is one that can be unmixed.
  • EThe components of a heterogeneous mixture exist in a range of phases.

Q7:

Which of the following best describes a compound?

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

Q8:

Fill in the blank: Calcium and chlorine combine to form calcium chloride, which is .

  • Aa mixture
  • Ba metal
  • Ca compound
  • Da solvent
  • Ean element

Q9:

Which of the following words describes the role of sodium chloride when it is dissolved in water?

  • ASolution
  • BDissolution
  • CSolute
  • DSolvent
  • EMixture

Q10:

Which of the following words describes the role of water when sodium chloride is dissolved in it?

  • AMixture
  • BSolution
  • CSolvent
  • DSolute
  • EDissolution

Q11:

Which of the following words describes the resulting liquid when sodium chloride is dissolved in water?

  • ACompound
  • BSolvent
  • CSolute
  • DSolution
  • EDissolution

Q12:

Which of the following statements correctly explains this reaction pathway? 2K+I2KI2KI()2()()()sgsaq

  • ATwo elements react to form a compound that is dissolved in water to form an aqueous solution.
  • BTwo elements react to form a compound that is dissolved in water to form a liquid.
  • CTwo elements react to form a mixture that is dissolved in water to form a liquid.
  • DTwo molecules react to form a compound that is dissolved in water to form an aqueous solution.
  • ETwo elements react to form a gas that is dissolved in water to form an aqueous solution.

Q13:

Which word describes a solution in which it is not possible to dissolve any more of a solid into a fixed quantity of water at a set temperature?

  • ASupersaturated
  • BUnsaturated
  • CSaturated
  • DHomogenous
  • EHeterogenous

Q14:

Which of the following describes liquid water combined with ice cubes in a beaker, as in the diagram?

  • AHomogeneous mixture
  • BHeterogenous suspension
  • CHomogeneous liquid
  • DHeterogeneous mixture
  • EHomogeneous solution

Q15:

In reaction equations, different notations are used to indicate different states of matter.

What is used to denote a solid?

  • A(𝑠)
  • B(π‘Žπ‘ž)
  • C(𝑔)
  • D(𝑙)

What is used to denote a liquid?

  • A(π‘Žπ‘ž)
  • B(𝑔)
  • C(𝑠)
  • D(𝑙)

What is used to denote a gas?

  • A(𝑙)
  • B(π‘Žπ‘ž)
  • C(𝑠)
  • D(𝑔)

What is used to denote a substance dissolved in water?

  • A(𝑠)
  • B(𝑔)
  • C(𝑙)
  • D(π‘Žπ‘ž)

Q16:

What is an aqueous solution?

  • APure water
  • BA 1 M solution
  • CA weak solution
  • DA solute, or solutes, dissolved in water
  • EWater dissolved in another solvent

Q17:

Which of the following is formed when a tea bag is placed in hot water?

Glass of Tea with Bag isolated
  • AHomogenous mixture
  • BHeterogeneous mixture
  • CHomogenous solution
  • DHomogenous liquid

Q18:

Fill in the blank: A combination of vinegar and oil is an example of a .

Balsamic vinegar and olive oil
  • AColloid
  • BMixture
  • CCompound
  • DSolvent
  • ESolution

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