Having a hard time with these questions. Will provide a thumbs up if solve corre

Question

Having a hard time with these questions. Will provide a thumbs up if solve correctly. For some questions I wasnt able to provide an image, so ignore that question.

1.Definite shape is a characteristic of which state of matter?

a. gaseous

b.solid

c.liquid

d.More than one response is correct.

2.Consider a substance as represented by the following models. The temperature of the substance is decreased to a very low value.

A

B

C

Which of the following models would best represent this substance at the lowered temperature?

A.A

B.B

C.C

3.Convert 856 torr to atmospheres.

a.1.13 atm

b.58.2 atm

c.0.0856 atm

d.0.888 atm

e.651 atm

4.Convert 0.725 atm to mm Hg.

a.551 mm Hg

b.486 mm Hg

c.1.05×103 mm Hg

d.73.5 mm Hg

5.A balloon containing 7.2 L air at 29.0 °C is placed in a freezer at -11.0 °C. What is the new volume of the balloon?

a.6.2 L

b.8.3 L

c.6.8 L

d.2.7 L

e. -19 L

6..Which of the following statements concerning gas pressure is/are correct?

(1) Gas pressure arises from collisions of gas molecules with the walls of the container holding the gas.
(2) Increasing the number of gas molecules within a container increases the number of collisions with the walls of the container, thereby increasing the gas pressure.
(3) As the temperature of a gas increases, gas molecules exert more force on the walls of their container.

a.2 only

b.1 and 2

c.2 and 3

d.1, 2, and 3

e.1 only

Acetylene burns in oxygen to give CO2 and H2O according to the equation below.

2 C2H2(g) + 5 O2 (g)      4 CO2(g) + 2 H2O(g)

7.What volume of oxygen will react completely with 29 L C2H2 ?

a.73 L

b.12 L

c.150 L

d.29 L

e.58 L

8.What is the pressure exerted by 1.96 g Xe gas at 24.0 °C in a 270-mL flask?

a.1.35 atm

b.177 atm

c.0.109 atm

d.14.3 atm

e.1.35×10-3 atm

9. A mixture of H2 and Ne is placed in a 2.00-L flask at 25 °C. The partial pressure of the H2 is 1.6 atm, and the partial pressure of the Ne is 2.5 atm. What is the mole fraction of H2?

A.0.64

B.0.20

C.0.060

D.0.61

E.0.39

10.Dry air is 78.08% nitrogen, 20.95% oxygen and 0.93% argon with the 0.04% being other gases. If the atmospheric pressure is 760.0 torr, what is the partial pressure of nitrogen in dry air?

A.78.08 torr

B.166.6 torr

C.593.4 torr

D.760.0 torr

11.Which of the following is a postulate of the kinetic-molecular theory of gases?
(1) The distance between gas molecules is large in comparison to their size.
(2) At a given temperature, all gases have the same average velocity.
(3) Gas molecules are in constant, random motion.

a.1 and 3

b.1 and 2

c.3 only

d.1 only

e.2 and 3

12.Which of these statements is not true of the kinetic molecular theory?

a.The kinetic energy of gas particles is proportional to the absolute temperature.

b. Gases are mostly empty space.

c.Gas particles are moving randomly at various speeds.

e.Gas particles have a significant degree of attraction.

13.Which of the following is an exothermic process?

a.Sublimation

b.Melting

c.Evaporation

d.Condensation

14.The direct change from the solid state to the vapor state is called _____.

a.evaporation

b.sublimation

c.boiling

d.fusion

15.Hydrogen bonding interactions occur in samples of which of the following substances?

a.H2S

b.H2O2

c.H2

d.CH3F

e.All of the Above

16.Which molecule below does not have intermolecular hydrogen bonding?

a.HF

b.CH2Cl2

c.NH3

d.CH3OH

17.Arrange the following molecules, H2S, F2, and CH3OH, in order of increasing strength of intermolecular forces.

a.H2S, F2, CH3OH

b.CH3OH, H2S, F2

c.CH3OH, F2, H2S

d.H2S, CH3OH, F2

e. F2, H2S, CH3OH

18. species below has the strongest intermolecular forces?

I2

F2

Br2

Cl2

19.Which of the following molecules will have the highest boiling point?

Br2

CO2

Ar

H2

O2

20.Based on their molecular structure, which of the following molecules would have the highest boiling point?

CO

CH4

CH2F2

CH3OH

CH3CH2OH

A

B

C

Explanation / Answer

1.     Definite shape is the characteristic of solids only. Liquids and gases do not have a definite shape

2.     Image not provided

3.     1 torr = 0.0013 atm

Thus, 856 torr = 856 * 0.0013 atm = 1.1128 atm = 1.13 atm (Rounded off to three significant fig.)

Thus answer is a.1.13 atm

4.     1 atm = 760 mmHg

Thus 0.725 atm = 0.725 * 760 mmHg = 551 mmHg

Answer is a.551 mmHg

5.     We have:

V1/T1 = V2/T2

V1=7.2 L ; T1 = 29 + 273 = 302 K

V2 = (x)      ; T2 = -11 + 273 = 262 K

Thus, 7.2 / 302 = (x) / 262

(x) = 7.2 / 302 * 262 = 6.2 L

Thus the answer is a. 6.2 L

6.     According to the Kinetic theory of gases , all of three statements are correct .

Answer is d

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