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Unit 2 Test Review

Unit 2 Test Review. When an iron nail is ground into powder what happens to it’s mass?. It stays the same . The volume of a gas is doubled while the temperature is held constant. How does the gas pressure change?. It is reduced by one half. . A sample of gas occupies 17 mL at

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Unit 2 Test Review

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  1. Unit 2 Test Review

  2. When an iron nail is ground into powder what happens to it’s mass? It stays the same

  3. The volume of a gas is doubled while the temperature is held constant. How does the gas pressure change? It is reduced by one half.

  4. A sample of gas occupies 17 mL at –112o C What volume does the sample occupy at 70o C? 17 mL X 343 K 161 K = 36 mL

  5. What would happen to the pressure with the following change? • The temperature is increased. Pressure increases

  6. What would happen to the pressure with the following change? The volume of the container is increased. Pressure decreases

  7. What would happen to the pressure with the following change? • More of the gas is added to the container. Pressure increases

  8. What would happen to the pressure with the following change? • The average kinetic energy of the gas in increased. Pressure increases

  9. What method would you use to determine the average kinetic energy of the molecules of water in a glass.? measure the water’s temperature

  10. Describe the movement of ideal gases according to the kinetic theory Motion is constant, random, and rapid

  11. 20-kg sample of a substance as it is cooled at a constant rate During which intervals on the graph is the average kinetic energy of the molecules in the sample decreasing? A, C and E

  12. How can you be CERTAIN that a chemical change has taken place? Check the composition of the sample before and after the change.

  13. What distinguishes a substance from a mixture? Mixtures can be separated physically, while compounds cannot

  14. Standard conditions when working with gases are defined as ____. 0o C and 101.3 kPa

  15. What causes gas pressure in a container such as a helium balloon? The collisions of fast-moving gas particles on the walls of the container

  16. How are average kinetic energy of the particles and temperature of a substance related? Kinetic energy is directly proportional to the temperature of the substance Temperature is a measure of the average kinetic energy of the particles of a substance

  17. Explain equilibrium vapor pressure. In a closed container the rate of evaporation will equal the rate of condensation

  18. As the temperature of the gas in a balloon decreases, what happens to each of the following? volume pressure kinetic energy decreases decreases decreases

  19. Which state of matter is characterized by having an indefinite shape, but a definite volume? liquid

  20. Which state of matter is most dense? solids

  21. Which state of matter have the strongest intermolecular attractions solids

  22. Which state of matter has the most space between their particles gas

  23. Which state of matter expands when heated and is easy to compress? gas

  24. Describe an ideal gas Small particles with no volumes or intermolecular attractions

  25. Classify the following:. table salt air nitrogen gold substance /compound mixture / homogenous substance / element substance / element

  26. Classify the following:. substance /compound mixture / homogenous mixture / heterogenous substance / element water stainless steel noodle soup oxygen

  27. Identify the following as a homogeneous mixture or heterogenous mixture? milk oil and vinegar air vinegar in water homogenous heterogenous homogenous homogenous

  28. Identify the following as a homogeneous mixture or heterogenous mixture? salt water beef stew sand and water soil homogenous heterogenous heterogenous heterogenous

  29. Identify the following as a chemical property or physical property color hardness ability to react freezing point physical physical chemical physical

  30. Identify the following as a chemical property or physical property mass density ability to rust melting point physical physical chemical physical

  31. Identify the following as a physical or chemical change corrosion melting food rotting explosion chemical physical chemical chemical

  32. Identify the following as a physical or chemical change toasted bread evaporating sea water dissolving sugar in water chemical physical physical

  33. Identify the following as a physical or chemical change gasoline burns gasoline boils oxygen is added to gasoline chemical physical physical

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