Answers to true/false formative pretest on
solutions
Answers to true/false formative pretest on
solutions
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1. |
T |
Solutions are homogeneous mixtures. |
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2. |
F |
A solvent like water can dissolve an unlimited amount of solute. |
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3. |
F |
Temperature increases usually decrease the solubility of a substance in water. |
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4. |
F |
A hydrate is a substance that does not dissolve in water. |
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5. |
F |
There is no such thing as a "supersaturated" solution. |
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6. |
F |
Gases do not dissolve in water or other liquids. |
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7. |
T |
When the pressure of a gas over a liquid is raised, the gas solubility increases |
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8. |
T |
The concentration unit of Molarity is the same as moles solute per liter of solution. |
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9. |
T |
A 2 Molar solution results when 2 moles of solute are dissolved in enough water to make 1 liter of solution. |
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10. |
T |
Miscible materials are substances that are mutually soluble, like H2O and CH3CH2OH. |
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11. |
T |
A unsaturated solution can dissolve more solute. |
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12. |
T |
If 20 mL of water and 20 mL of 3 M NaOH are mixed, the new concentration is 1.5 M NaOH |
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13. |
F |
Water will dissolve all ionic compounds. |
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14. |
T |
Organic compounds like C12H26 have London forces keeping molecules in the liquid. |
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15. |
T |
Water is a polar molecule and is a good solvent for ionic and polar solutes. |
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16. |
T |
Nonpolar substances do not dissolve well in water. |
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17. |
T |
Gas solubility in water decreases when the temperature goes up. |
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18. |
T |
Adding 9 mL of water to 1 mL of 4.0 Molar HCl will cut the concentration by a factor of ten to 0.40 M HCl. |
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19. |
T |
The concentration of a solution after dilution is always reduced by a factor equal to the initial volume of solution divided by the final volume, Voriginal/ Vfinal. |
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20. |
T |
Ionic substances dissolve to form electrically conducting solutions. |
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