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Thread: Science please help!

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    Science please help!

    1. Which of the following would likely form a heterogeneous mixture? (Points : 3)
    sand and water
    sugar and water
    baking soda and water
    salt and water


    2. Because the mud in muddy water eventually settles out, the muddy water is a __________. (Points : 3)
    colloid
    solution
    suspension


    3. Refer to the following illustration to answer Question 3.


    In the illustration, which solute will dissolve first?

    (Points : 3)
    The solute in Tank B will dissolve first.
    The solute in Tanks A and B will dissolve at equal rates.
    The solute in Tank A will dissolve first.


    4. In the Solubility lab, what did you change the temperature of? (Points : 3)
    solute
    entire solution
    solvent


    5. If solid material settles out of a mixture over time, the unknown mixture is likely a __________. (Points : 3)
    solution
    suspension
    colloid
    homogenous


    6. What does the rate of solution measure? (Points : 3)
    how fast a substance precipitates
    how much of a substance dissolves
    how fast a substance dissolves
    how much of a substance precipitates


    7. Separating out solute from a solvent through evaporation is a __________ process. (Points : 3)
    nuclear
    physical
    chemical


    8. In the Mixtures lab, you waited to see if the liquid would form lumpy or fluffy masses, which would indicate it was a __________. (Points : 3)
    homogenous mixture
    solution
    suspension
    colloid


    9. __________ is known as the universal solvent because it dissolves more solutes than any other solvent. (Points : 3)
    Hydrochloric acid

    Salt

    Vinegar

    Water



    10. What is solubility? (Points : 3)
    Solubility is how much solid only will dissolve in liquid only.

    Solubility is how much solute will precipitate out of solvent.

    Solubility is how much solute will dissolve in solvent.

    Solubility is how much solvent will dissolve in solute.



    11. Opening a soda bottle illustrates how a decrease in pressure will __________ the amount of gas that can be dissolved in water. (Points : 3)
    not change
    decrease
    increase


    12. Which of the following does not affect the rate of solubility? (Points : 3)
    temperature
    pressure
    weight
    surface area


    13. Refer to the following illustration to answer Question 13.



    Which type of mixture could this illustration represent?

    (Points : 3)
    not enough information to tell
    homogenous mixture
    heterogeneous mixture


    14. Refer to the following illustration to answer Question 14.



    Which type of mixture could this illustration represent?

    (Points : 3)
    heterogeneous mixture
    not enough information to tell
    homogeneous mixture


    15. You can increase the rate solute dissolves in solvent by __________. (Points : 3)
    using more particles of solute
    using larger particles of solute
    crushing particles of solute
    lowering the temperature of the solvent

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    1 - sand and water
    2- suspension
    5 - suspension
    6-how fast a substance dissolves
    9-water
    10-Solubility is how much solute will dissolve in solvent.
    12-temperature
    15- crushing particles of solute

    here are some of the answers i found, hope it helps

  3. #3

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    1. Sand and water

    2. Suspension

    3. Don't know (no picture)

    4. Don't know (no lab)

    5. Suspension

    6. How fast a substance dissolves

    7. Physical

    8. Colloid

    9. Water

    10. Solubility is how much solute will dissolve in solvent.

    11. Decrease

    12. Weight

    13. Don't know (no picture)

    14. Don't know (no picture)

    15. Crushing particles of solute

    ---

    You should probably at least attempt it to learn something, rather than paste your graded assignment for answers from others, next time.

  4. The Following User Says Thank You to Mod For This Useful Post:

    minecraftmac123 (04-16-2013)

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    1. Sand and Water. The rest form homogenous solutions or colloids.

    2. Suspension. Solutions have particles that are so small that they don't settle. Colloids have bigger particles, but don't settle due to Brownian Motion.

    3. Need the picture in order to answer.

    4. Refer to lab.

    5. Suspension. Refer to #2.

    6. How fast a substance dissolves.

    7. Physical. Solutions are still types of mixtures and therefore did not undergo a chemical reaction. Evaporation is only needed because the solute molecules are so small that they go through filter paper.

    8. Colloid.

    9. Water, even though technically the term is incorrect because universal refers to dissolving EVERY type of solute.

    10. Solubility is how much solute will dissolve in solvent.

    11. Decrease

    12. Weight. If temperature is increased, more solute can be added. If there is a lot of pressure, for example soda, then the solute (in this case, CO2 gas) will stay dissolved, and the rate of solubility is also affected by the surface area of the solute molecules.

    13. Refer to the following illustration to answer Question 13.

    14. Refer to the following illustration to answer Question 14.

    15. Crushing particles of solute. If you crush the solute, then there is more surface area, and therefore increase the rate solute dissolves.

    Hope this helps!

  6. The Following User Says Thank You to aznboy1997 For This Useful Post:

    minecraftmac123 (04-16-2013)

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