Science

8th

grade

Image

Chemistry Practice

12
plays

19 questions

Show Answers
See Preview
  • 1. Multiple Choice
    30 seconds
    1 pt

    Two different liquids are poured together in an open container. Bubbles begin to form. After the bubbling stops, it is determined that the total weight of the two liquids is less than before they were poured together. Which best describes this observation?

    Some of the atoms during the reaction escaped into the air.

    Some of the atoms during the reaction were destroyed.

    Some of the atoms during the reaction became heavier.

    Some of the atoms during the reaction changed to a different kind of atom.

  • 2. Multiple Choice
    30 seconds
    1 pt

    H2CO3 → H2O + CO2 How does the reaction support the Law of Conservation of Mass?

    Several molecules of water are produced.

    The mass of carbon atoms is reduced during the reaction

    The mass of the atoms in the reactant equals the mass of the atoms in the products.

    The mass of hydrogen atoms is the only thing that remains the same before and after the reaction.

  • 3. Multiple Choice
    30 seconds
    1 pt

    Which is classified as an element?

    carbon dioxide

    iron

    vinegar

    water

  • Answer choices
    Tags
    Answer choices
    Tags

    Explore all questions with a free account

    Already have an account?