Chemical Changes
22 minutes ago
mgalotto
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12 QuestionsShow answers
  • Question 1
    120 seconds
    Q.

    Bubbles and fizzing can be seen instantly when baking soda is mixed with vinegar. The bubbles are evidence of which of the following?

    answer choices

    A gas is formed when baking soda and vinegar are mixed.

    Baking soda dissolves in vinegar when they are mixed.

    Vinegar turns into alcohol when it is mixed with baking soda.

    A precipitate is formed when baking soda and vinegar are mixed.

  • Question 2
    120 seconds
    Q.

    A granular substance is added to a liquid. Which of the following would provide evidence to suggest a chemical change has taken place?

    answer choices

    The liquid gives off heat.

    The granules dissolve completely.

    The volume of the liquid increases.

    The granules seem to get smaller.

  • Question 3
    120 seconds
    Q.

    When two substances are mixed, they might form a new substance. Which of the following would indicate that a new substance has been formed?

    answer choices

    The temperature of the mixture decreases.

    The volume of the mixture increases.

    The mass of the mixture increases.

    One of the substances dissolves.

  • Question 4
    120 seconds
    Q.

    A student mixes two clear liquids together. After a few minutes, a white powder can be seen settling on the bottom of the test tube. Which of the following is a conclusion that the student can draw based on these observations? The two clear liquids -

    answer choices

    have combined to produce a new substance.

    were pure substances before they were mixed.

    are toxic and should be handled with extreme caution.

    have been stored too long and are no longer good.

  • Question 5
    120 seconds
    Q.

    Which of the following characteristics is shared by all chemical reactions?

    answer choices

    Produce a precipitate

    Show a color change

    Release heat energy

    Form new substances

  • Question 6
    120 seconds
    Q.

    A student added white crystals to a clear liquid. The crystals dissolved in the liquid. After a few seconds, the liquid became quite warm and then turned bright red in color. The first indication that a chemical change was taking place could be observed when -

    answer choices

    the crystals were added to the liquid.

    the crystals dissolved in the liquid.

    the temperature of the liquid increased.

    the color of the mixture changed.

  • Question 7
    120 seconds
    Q.

    All of the following are evidence of a chemical change EXCEPT -

    answer choices

    change in state of matter.

    formation of a gas.

    color change.

    precipitate forms.

  • Question 8
    120 seconds
    Q.

    If we have any substance, it can be concluded that a chemical change has happened if -

    answer choices

    there is a color change.

    the state of matter changes.

    there is a decrease in mass.

    the matter is stirred thoroughly.

  • Question 9
    120 seconds
    Q.

    Which of the following situations provides evidence that a chemical change has taken place?

    answer choices

    Water, when boiled, evaporates and turns into vapor.

    Sugar, when added to iced tea, dissolves into the liquid.

    Two liquids are mixed, and a solid substance forms.

    A piece of paper is cut into many small pieces.

  • Question 10
    120 seconds
    Q.

    Which of the following would indicate the formation of a new substance?

    answer choices

    A liquid turns to a solid

    A sample of metal melts

    Bubbles and fizzing occur

    A solid dissolves in a liquid

  • Question 11
    120 seconds
    Q.

    Four substances were mixed with a clear liquid. The observations are recorded in the following table. Based on the observations, for which mixture is there best evidence that a new substance was formed?

    answer choices

    Substance 1

    Substance 2

    Substance 3

    Substance 4

  • Question 12
    120 seconds
    Q.

    A student notices that sugar, when heated over a flame, turns black. How does the student know that a new substance is being formed?

    answer choices

    A temperature of the sugar increases.

    The color of the sugar changes to black.

    Sugar began to melt within the test tube.

    Sugar started as white crystals.

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