Lesson Worksheet: Compounds and Mixtures Chemistry • 7th Grade
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 true for mixtures?
- APure elements cannot form mixtures.
- BMixtures consist of particles of different substances mixed—but not reacted—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.
Q4:
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.
Q5:
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:
Fill in the blank: Calcium and chlorine combine to form calcium chloride, which is .
- Aa mixture
- Ba metal
- Ca compound
- Da solvent
- Ean element
Q8:
Which of the following words describes the resulting liquid when sodium chloride is dissolved in water?
- ACompound
- BSolvent
- CSolute
- DSolution
- EDissolution
Q9:
Which of the following words describes the role of water when sodium chloride is dissolved in it?
- AMixture
- BSolution
- CSolvent
- DSolute
- EDissolution
Q10:
Which of the following words describes the role of sodium chloride when it is dissolved in water?
- ASolution
- BDissolution
- CSolute
- DSolvent
- EMixture
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