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Introduction to Chemistry
Formative pretest true false questions for Lesson 8 Gases, Liquids, and Solids
These questions are a quick overview of the topics in this lesson. You are not expected to know this material before hand. The questions are intended to help you focus on material in the lesson. After you have studied the lesson you should be able to answer these and even more complicated questions.
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1. |
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A solid is converted to the liquid at the melting point. |
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2. |
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Gas density is the same at all temperatures. |
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3. |
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The average kinetic energy of gas molecules depends on Kelvin temperature. |
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4. |
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Air pressure changes with altitude. |
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5. |
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The psi ratings in tires on equipment indicate the weight of gas inside. |
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6. |
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One atmosphere pressure is 14.7 psi at sea level. |
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7. |
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One atmosphere pressure equals 760 mm Hg. |
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8. |
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The volume of a gas increases with increased pressure if the temperature stays constant. |
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9. |
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Gas laws like Boyles' law and Charles' law can be used to predict numerical changes in gas properties. |
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10. |
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Equal volumes of gas contain equal numbers of gas particles. |
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11. |
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STP means pressure of 1 atmosphere and temperature of 273 Kelvin. |
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12. |
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The dipole-dipole forces exist only between polar molecules. |
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13. |
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All hydrogen containing molecules show hydrogen bonding. |
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14. |
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Hydrogen bonding exists when molecules have any of the following combinations. H-F, H-O, H-N. |
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15. |
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Strong interactions between molecules result in low melting points. |
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16. |
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All liquids have a vapor pressure. |
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17. |
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Vapor pressure is high above a volatile liquid. |
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18. |
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All solids have a definite crystal structure. |
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19. |
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Metallic solids can conduct electricity. |
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20. |
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People sweat so the evaporation of water can help regulate body temperature. |
Put your name on this page. Put your name and "34A" on your Scantron answer sheet. Choose the best answer for each multiple choice item and mark the appropriate box on the Scantron sheet. Work out each problem and show your set-ups . No credit will be assigned for an answer to a problem if set-ups are absent.
1. What is the number of mols of N2 in 600. grams of nitrogen?
How many grams and mols of H2, hydrogen, will react with this amount of nitrogen?
The reaction is shown below.
N2 + 2 H2 -----> N2H4
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2. What is the number of mols HF needed to completely react with 4.0 mol of Ca(OH)2
according to the reaction 2 HF + Ca(OH)2 ------> 2 H2O + CaF2 .
SHOW WORK
3. What is the definition of an excess reagent?
4. What is the balanced equation for the following reaction
____ Li + _____ P4 ------> _____ Li3P .
5. Which reactant is the limiting reagent, if 40. grams of O2 and 40. grams of C2H4 react
according to the following reaction? Show work.
C2H4 + O2 -----> CO2 + H2O
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