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Chemical Reactions

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  • 1. Multiple Choice
    2 minutes
    1 pt

    Maria and Carla were hiking when Maria tripped, fell, and sprained her ankle. Carla took out the first-aid kit and unwrapped a cold pack. Carla popped a vial that was inside the cold pack. The pack began to get icy cold and Carla applied the pack to Maria's ankle.What kind of reaction occurred in the cold pack? What evidence supports your answer?

    A)It is a physical change as evidenced by a drop in temperature.

    B)It is a chemical change because two different chemicals are mixed together.

    C)It is a chemical change because heat energy is absorbed and the pack gets colder.

    D)It is a physical change because the substance in the vial dissolved in the pack's liquid.

  • 2. Multiple Choice
    2 minutes
    1 pt
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    Your teacher burns a piece of steel wool in class, demonstrating the chemical property, flammability. You are curious to see what other things can demonstrate chemical properties. Which of these does NOT demonstrate a chemical change?

    A)Burning sugar demonstrates a chemical change.

    B)The rusting of steel wool demonstrates a chemical change.

    C)Making soap by allowing fat to react with sodium hydroxide demonstrates a chemical change.

    D)Measuring the freezing point of different concentrations of salt water demonstrates a chemical change.

  • 3. Multiple Choice
    2 minutes
    1 pt

    A scoop of baking soda is added to a beaker containing vinegar. The baking soda disappears and bubbles are observed. This is an example of a _____________ change.

    A)chemical

    B)ionic

    C)phase

    D)physical

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