Chemistry Practice Exam Quiz!

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  • 1/11 Questions
    Base your answer to this question on the diagram below: What type of substance is represented by Z? - ProProfs

    Base your answer to this question on the diagram below: What type of substance is represented by Z?

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About This Quiz


Are you a good chemistry student? Chemistry is the scientific discipline that is involved with elements and compounds, which are made of atoms, molecules, and ions. This learning branch encompasses their composition, structure, properties, behaviors, and the changes they endure during a reaction with other substances. Chemistry answers pertinent questions, such as how do molecules and atoms interact with each other? This extremely interesting quiz will give you good practice material to prepare for your exam.

Chemistry Practice Exam Quiz! - Quiz

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  • 2. 

    Which terms are used to identify pure substances?

    • An element and a mixture

    • An element and a compound

    • A solution and a mixture

    • A mixture and a compound

    Correct Answer
    A. An element and a compound
    Explanation
    Pure substances can be identified by two terms: an element and a compound. An element is a substance that consists of only one type of atom, such as oxygen or gold. A compound, on the other hand, is a substance made up of two or more different elements that are chemically bonded together, like water (H2O) or carbon dioxide (CO2). Both elements and compounds are considered pure substances because they have a fixed composition and distinct properties.

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  • 3. 
    Base your answer to this question on the diagram below: What type of mixture is represented by X? - ProProfs

    Base your answer to this question on the diagram below: What type of mixture is represented by X?

    Correct Answer
    heterogeneous
    heterogeneous mixture
    Explanation
    Based on the diagram, X is represented by a mixture that contains different substances that are not evenly distributed. This can be observed by the presence of distinct regions or phases within the mixture. Therefore, X can be classified as a heterogeneous mixture.

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  • 4. 

    Which process is a chemical change?

    • Melting of ice

    • Vaporization of water

    • Freezing of water

    • Decomposition of water

    Correct Answer
    A. Decomposition of water
    Explanation
    The process of decomposition of water is a chemical change because it involves the breaking down of water molecules into their constituent elements, hydrogen and oxygen. This reaction requires the input of energy and results in the formation of new substances with different properties than the original water molecules.

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  • 5. 

    Which of these contains only one substance?

    • Distilled water

    • Sugar water

    • Saltwater

    • Rain water

    Correct Answer
    A. Distilled water
    Explanation
    Distilled water contains only one substance, which is water. It is obtained by the process of distillation, where impurities and other substances are removed, leaving behind pure water. In contrast, sugar water, saltwater, and rainwater contain additional substances dissolved in the water.

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  • 6. 
    Which particle diagram represents a sample of one compound, only? - ProProfs

    Which particle diagram represents a sample of one compound, only?

    Correct Answer
    A.
    Explanation
    The correct answer cannot be determined without the particle diagrams.

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  • 7. 
    Which particle diagram represents a mixture of element X and element Z, only? - ProProfs

    Which particle diagram represents a mixture of element X and element Z, only?

    Correct Answer
    A.
    Explanation
    The correct answer cannot be determined without the particle diagrams provided in the question.

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  • 8. 
    Given the diagrams X, Y, and Z below: Which diagram or diagrams represent a mixture of elements A and B? - ProProfs

    Given the diagrams X, Y, and Z below: Which diagram or diagrams represent a mixture of elements A and B?

    • X, only

    • Z, only

    • X and Y

    • X and Z

    Correct Answer
    A. Z, only
    Explanation
    The diagram Z represents a mixture of elements A and B because it shows both elements A and B present together. Diagram X does not show element B, and diagram Y does not show element A. Therefore, only diagram Z is a representation of a mixture of elements A and B.

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  • 9. 
    Given the simple representations for atoms of two elements: Which particle diagram represents molecules of only one compound in the gaseous phase? - ProProfs

    Given the simple representations for atoms of two elements: Which particle diagram represents molecules of only one compound in the gaseous phase?

    Correct Answer
    A.
  • 10. 
    Samples A, B, and C contain molecules at STP. Explain, in terms of the composition, why sample A represents a pure substance. - ProProfs

    Samples A, B, and C contain molecules at STP. Explain, in terms of the composition, why sample A represents a pure substance.

    Correct Answer
    only one compound
    only one substance
    only one molecule
    one compound
    one substance
    one molecule
    only one kind
    one kind
    Explanation
    Sample A represents a pure substance because it contains only one compound, which means it consists of a single type of molecule. This indicates that all the particles in the sample are identical in composition and properties, making it a homogeneous substance.

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  • 11. 
    Samples A, B, and C contain molecules at STP. Explain why sample C could represent a mixture of fluorine and hydrogen chloride. - ProProfs

    Samples A, B, and C contain molecules at STP. Explain why sample C could represent a mixture of fluorine and hydrogen chloride.

    Correct Answer
    one element and one compound
    one element one compound
    one compound and one element
    one compound one element
    element and compound together
    element and compound
    two different substances
    different things
    two different things
    Explanation
    Sample C could represent a mixture of fluorine and hydrogen chloride because it contains both an element (fluorine) and a compound (hydrogen chloride). A mixture is a combination of two or more substances that are physically combined, and in this case, the presence of both an element and a compound suggests that there are two different substances present in the sample.

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  • Current Version
  • Mar 22, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Dec 05, 2011
    Quiz Created by
    Ionca
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