CHM103

Category: CHM103

ATTENTION:

Kindly note that you will be presented with 50 questions randomized from the NOUN question bank. Make sure to take the quiz multiple times so you can get familiar with the questions and answers, as new questions are randomized in each attempt.

Good luck!

CHM103

1 / 50

1. A sample of oxygen occupies 47.2 liters under a pressure of 1240 torr at 25 $^{o}C$. What volume would it occupy at 25$^{o}C$ if the pressure were decreased to 730 torr?

A. 27.8 L

B. 32.3 L

C. 47.8 L

D. 29.3 L

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2. What is the average speed (actually the root-mean square speed) of a neon atom at 27 C?

A. 183 m/s

B. 610 m/s

C. 19.3 m/s

D. 3.34 m/s

3 / 50

A gas that obeys all the gas laws is called an ______

4 / 50

 A plot showing the variation of volume with temperature at constant pressure is called __________

5 / 50

The mathematical equation for Boyle's law can be written as ___________

6 / 50

Apparatus that arc basically used for determining the melting points of substances are called ____________

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7. The Henry's law constant for helium gas in water at 30 °C is 0.00037 M/atm. When the partial pressure of helium above a sample of water is 0.650 atm, the concentration of helium in the water is __________ M.

A. 0.000241

B. 0.00176

C. 1.3

D. 0.000569

8 / 50

 The gas law that explain the effusion of gas is ____________

9 / 50

The rate at which gases diffuse is inversely proportional to the Square root of their ____________

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10. The vapor pressure of pure ethanol at 60 °C is 0.459 atm. Raoult's Law predicts that a solution prepared by dissolving 10.0 mmol naphthalene (nonvolatile) in 90.0 mmol ethanol will have a vapour pressure of __________ atm.

A. 0.79

B. 0.0918

C. 0.413

D. 0.498

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11.

Constituents in a solution can be separated by applying the principle of ___________

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12. Which of the following is not a colligative property?

A. Boiling point elevation

B. Vapour pressure lowering

C. Increase in latent heat

D. Freezing point depression

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13.

At high temperature and low pressure, gases tend to undergo phenomena that is called  ___________

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14.

 At constant temperature, the gas law that is most suitable is called _____ law

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15. An ideal gas differs from a real gas in that the molecules of an ideal gas __________.

A. have a molecular weight of zero

B. have no attraction for one another

C. have an average molecular mass

D. have no kinetic energy

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16. Which measurement describes the pressure of a gas?

A. 2.5 L

B. 1.2 g/L

C. 725 mm Hg

D. 315 K

17 / 50

17. Which of the followings will not diffract X-rays?

A. Liquid

B. Solid

C. Gas

D. Crystal

18 / 50

18.

The volume occupied by 1 mole of oxygen gas at s.t.p. is ________ dm3

19 / 50

19.

The mathematical equation for Charles law can be written as ________

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20.

Gas molecules confined to a container are in a state of ____________ motion

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21.

A solution is prepared by dissolving calcium chloride in water and diluting to 500.0 mL. If this solution contains 44 ppm chloride ions, the concentration of
calcium ions is __________ ppm.

A. 44

B. 22

C. 11

D. 88

22 / 50

22. In fractional distillation, a mixture of liquids is separated based on their _______

A. chemical composition

B. solubility

C. density

D. boiling points

23 / 50

23.

The equation of ideal gas can be expressed as ______

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24.

-______is a state of matter that does not have a definite shape nor volume

25 / 50

25.

Physical Chemistry is concern with two major aspects, namely ability to change and _____

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26.

The individual pressure of a gas in a mixture of gases is called ______

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27. A liquid will "wet" a surface if: ______

A. the liquid has a lesser density than the surface

B. the forces between the molecules and the surface are greater than the forces between the molecules of the liquid

C. the forces between the liquid molecules are weak

D. the liquid has a low vapor pressure

28 / 50

28. Which of the following statements is false?

A. Molecules of CH4(g) at high pressures and low temperatures have no attractive forces between each other.

B. Molecules of an ideal gas are assumed to have no significant volume.

C. The properties of N2(g) will deviate more from ideality at -100oC than at 100oC.

D. Van der Waal's equation corrects for the nonideality of real gases.

29 / 50

29.

The Beckman thermometer IS used in the Beckman's apparatus for determining __________ of a substance

30 / 50

30. According to the kinetic theory of gases, a gas can be compressed much more than a liquid or solid because _________

A. the particles of a gas are very far apart.

B. a gas is composed of very small particles.

C. gas particles do not attract or repel one another.

D. gas particles move rapidly.

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31. Which of the followings is not a characteristic of an ideal solution?

A. It must be colourless

B. There is no volume change on mixing

C. There is no enthalpy change on mixing

D. It must obey Raoult’s law

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32.

Modern approach to chemistry deals with equilibrium properties, ability to change and ______

33 / 50

33. A mixture of iron filings and copper filings could best be separated by _________

A. distillation

B. sieving

C. adding water, then filtering

D. magnetic separation

34 / 50

34.

In a gas. the molecules on the average are separated by large ______ distances

35 / 50

35.

_________ of a gas is proportional to the mean kinetic energy of the molecules in a gas

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36. The concentration of KBr in a solution prepared by dissolving 2.21 g of KBr in 897 g of water is __________ molal.

A. 2.46

B. 0.0167

C. 0.0207

D. 0.0186

37 / 50

37. Distillation can be used to separate ________

A. a solid from a solid

B. a soluble solid from a solution

C. an insoluble solid from a solution

D. a liquid from a solution

38 / 50

38. Which of these alkanes is expected to have the highest viscosity?

A. Heptane

B. Octane

C. Nonane

D. Decane

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39.

At relatively low pressure, there are no ___________ forces between gas molecules

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40.

International system of unit or system international can be written as an acronym _______________

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41.

A skillful process of identifying. substituting and using correct apparatus appropriately in the laboratory is called _____

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42.

At low temperature and high pressure, gases  tend to __________

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43.

The temperature, above which a substances can exist only in gaseous state is called _________

44 / 50

44.

Numerical value of the universal gas constant is ____ J/K/mol

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45. Ethanol dissolved in water would be an example of ___________

A. a suspension between two liquids

B. ethanol and water do not form a solution

C. a solution between a solid and liquid

D. a solution between two miscible liquids

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46.

The process of separating a pure substance from a solution is called _______

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47.

Temperature, length, time and mass are examples of ________

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48.

Meter, kelvin, second and kilogram are  examples of _______

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49.

At constant pressure, properties of gases that undergo changes are _______

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50.

________ is an instrument that can be used to measure the strength of an acid or a base

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