Let’s see how much you’ve picked up with these experiments and the reading – answer as best as you can. (No peeking at the answers until you’re done!) Just relax and see what jumps to mind when you read the question. You can also print these out and jot down your answers in your science notebook.


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Molecules Exercises


  1. What does endothermic mean? (a) the study of bugs (b) when a chemical reaction gives off heat (c) when a chemical reaction absorbs heat (d) the study of chemical reactions
  2. Why does red cabbage work to indicate acid or bases?
  3. Where can you find acetic acid in your house right now?
  4. Turmeric needs to be mixed with what before it can be used as an indicator? (a) hydrogen peroxide (b) rubbing alcohol (c) acetic acid (d) cold water
  5. When the red cabbage indicator is added to acetic acid, it turns (a) pink (b) blue (c) green (d) purple (e) yellow
  6. What happens when you heat up your cobalt chloride painting?
  7. In the electrolysis experiment, which gas gives you the “POP!” ? (a) hydrogen (b) oxygen (c) nitrogen (d) sulfur hexafluoride
  8. If you splash chemicals in your eyes, what is the first thing you should do? (a) put on your safety goggles (b) scream (c) rinse with running water, like from the sink or hose (d) call poison control
  9. If your dog accidentally eats your chemicals, what should you do? (a) lock him up (b) take him to the vet (c) call poison control (d) palpate his abdomen
  10. Which of these are chemical changes? (a) setting a wad of paper on fire (b) chewing gum (c) eating raisins (d) initializing a cold pack
  11. Which of these are physical changes? (a) light sticks (b) splashing in a puddle (c) drinking water (d) making slime

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Comments

4 Responses to “‘Molecules’ Exercises”

  1. e act of drinking water (putting it in your mouth, not digesting it. 🙂 It’s technically both, when you look at the big picture.

  2. Liliana Vitor says:

    My son and I just finished the section on Molecules and don’t understand the answer to number 11 in the Exercise. How is drinking water a physical change?

  3. Courtney Barton says:

    Why do we not have access to the Molecule exercises? We started with Unit 1, and I thought we’d have access to those exercises.

  4. Danielle Elizalde says:

    ok