Chemistry Chapter 1 Pre-Test

CHEMISTRY: Here’s some GREAT practice for the test – a Chapter 1 Pre-Test. Fill in your answers below. When you are finished, be sure and click Submit and check to see which ones you missed.

UPDATE: This is the new Thursday night homework (and you can also work ahead). Use it to study for the test! It’s due by 8:00 AM Friday morning. Let’s see what you know! 🙂

P.S. Click here for a link if that will work better for you!
Chemistry Chapter 1 Pre-Test

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9 thoughts on “Chemistry Chapter 1 Pre-Test

  1. Topic: A, Ask

    Q: How do you determine what chemicals we use to clean kill viruses but hurt our lungs?
    A: We can run tests like ex-rays and determine their exposure to certain chemicals within a certain time frame and see what the effects are.

  2. Q. When you place a paper cup under a flame it starts to burn in a second, but if you put water in the paper cup prior to placing it the flame the cup will not burn. Why is this so?
    A. When placed in the flame the cup doesn’t catch on fire because the heat is transfered to the cup, the cup transfers the heat to the water, and there is not enough heat to go back to the cup to burn.

  3. Q: If Neon is a Noble Gas, which means it is colorless, why are there so many colorful neon signs.
    A: Neon is naturally a red/ orange color. But when it is put in a white tube, it becomes classic red. In order to get other colors using Neon, a clear tube with a colored tint is used.

  4. Q: Why do copper compounds come in different color?
    A: Copper absorbs part of the spectrum. The blue color of copper sulfate is because of light energy exciting electrons and water interacting with copper ions. Heating copper sulfate makes it colorless. Copper creates a green flame because energy is exciting electrons and when energy is returned it only gives out green light.

  5. Q: Why do copper compounds come in different color?
    A: Copper absorbs part of the spectrum. The blue color of copper sulfate is because of light energy exciting electrons and water interacting with copper ions. Heating copper sulfate makes it colorless. Copper creates a green flame because energy is exciting electrons and when energy is returned it only gives out green light.

  6. Q: Why do copper compounds come in different color?
    A: Copper absorbs part of the spectrum. The blue color of copper sulfate is because of light energy exciting electrons and water interacting with copper ions. Heating copper sulfate makes it colorless. Copper creates a green flame because energy is exciting electrons and when energy is returned it only gives out green light.

  7. Q:what is used to separate solutions because of different parts move at different rates and therefore different distances than others?

    A: paper chromatography

  8. Q: Why does salt and sugar dissolve in water but sand doesn’t?

    A: The bond between the molecules of salt and sugar are weaker so they break down and form a homogeneous solution, but the bond between sand’s molecules is stronger therefore it makes a heterogeneous mixture.

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