How many moles of oxygen (O2) must be placed in a container with a volume of 50.0 liters to produce a pressure of 4.50 atm at standard temperature? (Points: 1)
32 mol
7.5 mol
10.0 mol
28.0 mol
2. A sample of gas measures 3.50 liters at 273 K. At what temperature will its volume become 4.50 liters, assuming pressure remains constant? (Points: 1)
212 K
173 K
351 K
cannot be determined
3. A 5.0 liter tank of oxygen gas is at a pressure of 3.0 atm. What volume will be available if the oxygen is used at the normal atmospheric pressure of 1.0 atm? (Points: 1)
.6 liters
15.0 liters
1.67 liters
cannot be determined
4. What would happen to the pressure of a sample of gas if it were moved from sea level to 6.0 km above sea level? (Points: 1)
the pressure would stay the same
the pressure would be halved
the pressure would be doubled
the pressure would be tripled
5. R, the gas constant in the ideal gas equation, has a numerical value of 0.0821, what are the units? (Points: 1)
atm-liter/mol-K
atm-m3/mol-K
Pa-m3/mol-K
Pa-liter/mol-K
6. The most useful unit for describing the amount of gas is the: (Points: 1)
liter
cubic meter
mole
atmosphere
7. The temperature scale that has absolute zero as its zero point is the: (Points: 1)
Celsius scale
Kelvin scale
Rankin scale
Fahrenheit scale
8. The characteristics/variables of gases needed to describe a gas completely include all of the following except: (Points: 1)
pressure
temperature
density
volume
9. The ability of gas to spread rapidly through other gases is explained by: (Points: 1)
frequent inelastic collisions of the particles
the high density of gases
the high temperature of gases
constant random motion of particles
10. Collisions of gas particles in which no energy of motion is lost are called: (Points: 1)
perfectly elastic
mostly elastic
both elastic and inelastic
inelastic
11. Raising the temperature of a gas in a fixed volume container will most likely change the: (Points: 1)
number of particles in the container
density of the gas in the container
pressure exerted by the gas in the container
size of the gas particles in the container
12. Which of the following is not a property of gases? (Points: 1)
Gases can be compressed into smaller spaces
Gases diffuse throughout other gases
Gases exert pressure on objects
Gases are weightless near the surface of the Earth
13. Represented by “R” used in the ideal gas equation: (Points: 1)
ion
electronegativity
cathode ray
gas constant
14. What is the density (g / L) of CO2 at 25oC, 1.8 atm ? (R=.0821 L atm / K mol)? (Points: 1)
12.5
3.2
5.9
.088
15. How much faster is He gas than CO2? (Points: 1)
3.3
5.5
11.3
15.4
16. Real gases exist at: (Points: 1)
high temperature, high pressure
low temperature, low pressure
low temperature, high pressure
absolute zero
17. Which of the following is not part of the kinetic molecular theory? (Points: 1)
The higher the pressure of a gas, the higher the speed.
The lower the temperature of a gas the lower the speed.
Attractions between gas molecules are negligible.
The energy between gas molecules collisions are conserved.
18. How many moles of an ideal gas exist at 2.0 atm, 195 L, 25 oC ? (R = .0821 L atm / K mol )? (Points: 1)
2.0
4.0
16.0
32.0
19. Convert 250. ml of a gas at 25 oC, and 845 mm Hg to STP. (Points: 1)
255 mL
355 mL
455 mL
555 mL
20. As the pressure of a gas increases at constant temperature, the volume: (Points: 1)
stays the same
increases
varies up and down
decreases
2007-11-29 13:34:48 · 3 answers · asked by whf 2 in Science & Mathematics ➔ Chemistry
Get working! You can not cheat on a test. Please give me your teacher's email so I can write him or her to let them know my answers if you want my answers to be given. You need to learn this material as it is relatively basic chemistry.
2007-11-29 13:42:53 · answer #1 · answered by Anonymous · 0⤊ 1⤋
Sorry, I already have my Ph.D.; I am through with exams.
It's one thing to help a struggling student to gain a better appreciation for the subject, but I wouldn't go so far as to help him get a high mark in a subject he doesn't know that much about. It makes for very incompetent chemists later on. Go do something else, something you're actually good at.
2007-11-29 13:42:01 · answer #2 · answered by Anonymous · 2⤊ 0⤋
Where I come from, a test, be it online, take=home, or in school, unless stated by the tester, is to be done by a student WITHOUT HELP. If you get such help, you are CHEATING!
That may be OK in your world, but not in mine.
2007-11-29 13:41:38 · answer #3 · answered by cattbarf 7 · 3⤊ 0⤋
its A
2015-04-15 10:39:18 · answer #4 · answered by Dean 1 · 0⤊ 0⤋