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Chemistry

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I need someone to check these True or False questions for me please:

3. Dissolving salt in water is a physical change- F

14. Burning newspaper is a physical change- F

19. The liter is a measure of volume- T

20. The amount of heat and temperature of a substance are the same- F

21. Zero degrees is the freezing point of water on the Fahrenheit scale- F

23. Scientific laws can change- I was kind of stuck on this one because my text book says that "these laws can be reinterpreted" but the internet says they can't be so...F?

24. Mass is the measure of the earth's gravitational attraction- F

29. Rusting of iron is a chemical property- T

38. Scientists use the SI system of measure.- T

Thanks
-MC

  • Chemistry - ,

    3. Dissolving salt in water is a physical change- F
    It was Na ions and Cl ions in the solid form; it's Na ions and Cl ions in the dissolved form. physical change

    14. Burning newspaper is a physical change- F
    I suppose the ACT of burning a newspaper is a physical change but burning a newspaper produces CO2 and water so it is a chemical change.


    19. The liter is a measure of volume- T
    ok

    20. The amount of heat and temperature of a substance are the same- F
    ok

    21. Zero degrees is the freezing point of water on the Fahrenheit scale- F
    ok

    23. Scientific laws can change- I was kind of stuck on this one because my text book says that "these laws can be reinterpreted" but the internet says they can't be so...F?
    I suppose you could get into a heated argument on this. Certainly, if sufficient data presents itself, laws CAN be changed (reinterpreted is just a euphemism for "laws can be changed but we don't want to admit it" but many will argue that "theit law wasn't well founded so it really wasn't a valid law and we really aren't changing it." I think they can be changed in light of new and relevant data.


    24. Mass is the measure of the earth's gravitational attraction- F
    OK

    29. Rusting of iron is a chemical property- T
    OK

    38. Scientists use the SI system of measure.- T
    That's true, especially if we must; however, not all of us like all of them.

  • Chemistry - ,

    So #3 is T?

    Thanks a lot!
    -MC

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