Chpt 1 Ideal Gas Behavior Flashcards
1
Q
QUESTION
A
OPTION 1
2
Q
- (Which gas law relates volume and temperature at constant pressure? A. Boyle’s Law B. Charles’ Law C. Avogadro’s Law D. Dalton’s Law)
A
Answer: B. Charles’ Law
3
Q
- (At standard temperature and pressure (STP), the volume of one mole of gas is: A. 24.0 dm³ B. 22.4 dm³ C. 20.0 dm³ D. 18.0 dm³)
A
Answer: B. 22.4 dm³
4
Q
- (What is the molar volume of a gas at STP? A. 8.314 dm³ B. 22.4 dm³ C. 100 dm³ D. 1.0 dm³)
A
Answer: B. 22.4 dm³
5
Q
- (The universal gas constant (R) in SI units is: A. 0.0821 L·atm·mol⁻¹·K⁻¹ B. 8.314 J·mol⁻¹·K⁻¹ C. 22.4 J·mol⁻¹·K⁻¹ D. 100.3 J·mol⁻¹·K⁻¹)
A
Answer: B. 8.314 J·mol⁻¹·K⁻¹
6
Q
- (The equation is known as: A. Boyle’s Law B. Ideal Gas Equation C. Dalton’s Law D. Graham’s Law)
A
Answer: B. Ideal Gas Equation
7
Q
- (Avogadro’s principle states that: A. Pressure is directly proportional to temperature. B. Equal volumes of gases contain equal moles under the same conditions. C. Volume is inversely proportional to pressure. D. Density is constant for all gases.)
A
Answer: B. Equal volumes of gases contain equal moles under the same conditions.
8
Q
- (What is the density formula derived from the ideal gas law? A. B. C. D.)
A
Answer: (Specify correct formula here)
9
Q
- (Which law explains the behavior of gas mixtures? A. Dalton’s Law B. Graham’s Law C. Charles’ Law D. Boyle’s Law)
A
Answer: A. Dalton’s Law
10
Q
- (The total pressure of a gas mixture is equal to: A. The average of individual pressures B. Pressure of the heaviest gas C. The sum of partial pressures of component gases D. Atmospheric pressure)
A
Answer: C. The sum of partial pressures of component gases
11
Q
- (What is the molecular weight of a gas if 1.5 g vaporizes at 100°C in a 500 cm³ container under 2 atm? A. 22.4 g·mol⁻¹ B. 45.88 g·mol⁻¹ C. 50 g·mol⁻¹ D. 60 g·mol⁻¹)
A
Answer: B. 45.88 g·mol⁻¹
12
Q
Here’s the continuation with the same format:
A
13
Q
- (Graham’s Law of Diffusion states that the rate of diffusion is inversely proportional to: A. Square root of molar mass B. Absolute temperature C. Gas volume D. Gas pressure)
A
Answer: A. Square root of molar mass
14
Q
- (What is the molecular weight of methane if it diffuses 2 times faster than sulfur dioxide? A. 16 g·mol⁻¹ B. 32 g·mol⁻¹ C. 64 g·mol⁻¹ D. 45 g·mol⁻¹)
A
Answer: A. 16 g·mol⁻¹
15
Q
- (Under STP, what is the relationship between molar volume and density? A. Inversely proportional B. Directly proportional C. Constant D. Exponential)
A
Answer: A. Inversely proportional
16
Q
- (Dalton’s Law is applicable when: A. Gases mix without chemical reaction. B. Gases react chemically. C. One gas is compressed. D. Pressure is low.)
A
Answer: A. Gases mix without chemical reaction.
17
Q
- (If a gas at 27°C and 640 mmHg is heated to 48°C, what happens to its pressure? A. It increases to 689 mmHg. B. It remains 640 mmHg. C. It decreases. D. It doubles.)
A
Answer: A. It increases to 689 mmHg.
18
Q
- (The molecular weight of a gas is determined using: A. Ideal Gas Law B. Dalton’s Law C. Graham’s Law D. Boyle’s Law)
A
Answer: A. Ideal Gas Law
19
Q
- (A gas is considered ideal when: A. It follows all gas laws under all conditions. B. It behaves like a real gas. C. It condenses easily. D. It deviates at low temperatures.)
A
Answer: A. It follows all gas laws under all conditions.
20
Q
- (What is the partial pressure of oxygen in air containing 21% oxygen at 746 mmHg? A. 156.66 mmHg B. 200 mmHg C. 300 mmHg D. 746 mmHg)
A
Answer: A. 156.66 mmHg
21
Q
- (What is the main limitation of Dalton’s Law? A. It applies only to ideal mixtures. B. It does not account for gas reactions. C. It cannot determine pressure. D. It requires a vacuum.)
A
Answer: B. It does not account for gas reactions.
22
Q
- (The average molecular weight of dry air composed of 21% O₂, 78% N₂, and 1% argon is: A. 28.84 g·mol⁻¹ B. 29.00 g·mol⁻¹ C. 22.4 g·mol⁻¹ D. 32 g·mol⁻¹)
A
Answer: A. 28.84 g·mol⁻¹
23
Q
- (If a gas weighs 2.5 g·dm⁻³ at 371 K and 740 mmHg, its molar mass is: A. 78 g·mol⁻¹ B. 50 g·mol⁻¹ C. 32 g·mol⁻¹ D. 16 g·mol⁻¹)
A
Answer: A. 78 g·mol⁻¹
24
Q
- (The relationship explains: A. Gay-Lussac’s Law B. Boyle’s Law C. Dalton’s Law D. Charles’ Law)
A
Answer: A. Gay-Lussac’s Law
25
Q
- (In a mixture of gases, the mole fraction is: A. Ratio of moles of a gas to total moles in the mixture B. Ratio of moles to volume C. Total moles D. Ratio of pressure to temperature)
A
Answer: A. Ratio of moles of a gas to total moles in the mixture
26
Q
- (Which state of matter has a fixed shape and volume? A. Liquid B. Gas C. Solid D. Plasma)
A
Answer: C. Solid
27
Q
- (What is the process called when gas molecules spread uniformly through an enclosed space? A. Compression B. Expansion C. Diffusion D. Sublimation)
A
Answer: C. Diffusion
28
Q
- (What property makes gases highly compressible compared to liquids and solids? A. High molecular density B. Strong intermolecular forces C. Large intermolecular spaces D. Fixed volume)
A
Answer: C. Large intermolecular spaces
29
Q
- (Which law relates the pressure and volume of a gas at constant temperature? A. Charles’ Law B. Gay-Lussac’s Law C. Boyle’s Law D. Dalton’s Law)
A
Answer: C. Boyle’s Law
30
Q
- (According to Boyle’s Law, if the pressure on a gas is doubled, what happens to its volume? A. Doubled B. Remains the same C. Halved D. Tripled)
A
Answer: C. Halved
31
Q
- (In Boyle’s Law, what kind of graph is obtained when plotting volume (V) against pressure (P)? A. Straight line B. Rectangular hyperbola C. Parabola D. Exponential curve)
A
Answer: B. Rectangular hyperbola
32
Q
- (Which device is used to measure the pressure of a gas? A. Barometer B. Thermometer C. Manometer D. Hydrometer)
A
Answer: C. Manometer
33
Q
- (What is the mathematical expression of Boyle’s Law? A. B. C. D. )
A
Answer: A.
34
Q
- (What does the term “isotherm” refer to in gas behavior studies? A. Constant pressure B. Constant volume C. Constant mass D. Constant temperature)
A
Answer: D. Constant temperature
35
Q
- (Which property of gases makes them diffuse faster than liquids? A. Higher density B. Lower compressibility C. High fluidity D. Negligible intermolecular forces)
A
Answer: D. Negligible intermolecular forces
36
Q
- (What is the value of the constant in Charles’ Law for volume expansion? A. B. C. D. )
A
Answer: A.
37
Q
- (What is the temperature at absolute zero in the Kelvin scale? A. -273 K B. 0 K C. 273 K D. 100 K)
A
Answer: B. 0 K
38
Q
- (In Charles’ Law, if the temperature of a gas is doubled, what happens to its volume? A. Halved B. Remains constant C. Doubled D. Tripled)
A
Answer: C. Doubled
39
Q
- (What is the unit of pressure equivalent to 760 mm Hg? A. 1 Torr B. 1 atm C. 100 Pa D. 1 bar)
A
Answer: B. 1 atm
40
Q
- (What temperature scale has its zero point at absolute zero? A. Celsius B. Fahrenheit C. Kelvin D. Rankine)
A
Answer: C. Kelvin
41
Q
- (In a gas law experiment, what happens to gas volume when external pressure is reduced? A. Decreases B. Remains the same C. Increases D. Vanishes)
A
Answer: C. Increases
42
Q
- (Which of the following gases has a strong odor and green color? A. Oxygen B. Chlorine C. Helium D. Hydrogen)
A
Answer: B. Chlorine
43
Q
- (What is the main cause of deviations from ideal gas behavior at high pressure? A. Decreased density B. Increased intermolecular forces C. Decreased molecular speed D. Increased compressibility)
A
Answer: B. Increased intermolecular forces
44
Q
- (What is the mathematical formula for calculating the pressure of a gas using mercury height? A. B. C. D. )
A
Answer: A.
45
Q
- (According to Charles’ Law, the graph of volume vs. temperature at constant pressure is: A. A hyperbola B. A parabola C. A curve D. A straight line)
A
Answer: D. A straight line
46
Q
- (What device was used in Boyle’s original experiment? A. Bourdon gauge B. U-tube manometer C. Piston-cylinder D. Pressure gauge)
A
Answer: B. U-tube manometer
47
Q
- (What is the correct relationship for Charles’ Law in absolute temperature? A. B. C. D. )
A
Answer: A.
48
Q
- (Which term describes the ability of gases to flow like liquids? A. Compressibility B. Expansion C. Fluidity D. Diffusion)
A
Answer: C. Fluidity
49
Q
- (If a gas has a pressure of 760 mm Hg and the height of mercury is 10 mm, what is its pressure in Pascals? A. B. C. D. )
A
Answer: A.
50
Q
- (What gas law involves a constant fraction of volume increase per degree rise in temperature? A. Boyle’s Law B. Charles’ Law C. Graham’s Law D. Dalton’s Law)
A
Answer: B. Charles’ Law
