31 Questions with Answers - General Chemistry I | C 150 | Exams Chemistry

South Carolina State University

Department of Physical Sciences Name:……………………………………...

SGCH1, General Chemistry I, NH VERSION 1 Date…………………………..

1. If an airplane's speed is 850 mi/h, what is its speed in m/s?

a) 4.0 x 105 m/s b) 380 m/s c) 1360 m/s d) 40 m/s e) 528 m/s

2. Perform the indicated mathematical operations and express the answer in scientific notation rounded off to the proper number of

significant figures: (8.001 x 102 ) x (2.88 x 103 ö 2.4 x 10-„) =

a) 9.6 x 10-2 b) 9.601 x 10Š c) 9.60 x 10Š d) 9.6 x 102 e) 9.6 x 10Š

3. Which one of the following lists units of volume in increasing order, i.e., from smallest to largest?

a) milliliter < centiliter < liter < kiloliter < microliter b) centiliter < milliliter < liter < kiloliter < microliter

c) milliliter < centiliter < microliter < kiloliter < liter d) microliter < kiloliter < centiliter < liter < milliliter

e) microliter < milliliter < centiliter < liter < kiloliter

4. What is the specific gravity of nickel if 2.35 cm3 of nickel has the same mass as 20.9 mL of water at room temperature?

a) 49.2 b) 8.89 c) 2.14 d) 0.112 e) 19.7

5. A 10.0 kg piece of metal at 50.0°C is placed in 1000. g of water at 10.0øC in an insulated container. The metal and water come to

the same temperature at 30.6øC. What is the specific heat of metal? The specific heat of water is 4.18 J/gúøC.

a) 0.0216 J/gúøC b) 0.721 J/gúøC c) 0.444 J/gúøC d) 0.0686 J/gúøC e) 0.124 J/gúøC

6. Trying to identify a sample of a pure substance, a student makes the following observations:

I. It has a mass of 5400 g. II. It is 10. cm long, 10. cm wide, and its height is 20. cm.

III. It is a shiny solid at room temperature. IV. It dissolves in hydrochloric acid.

V. It melts at 660 °C. VI. It is a good conductor of electricity.

Which response includes all of these observations that, individually or in combination, would be helpful in identifying the

substance of which the sample is composed?

a) I, II, III, IV, V, and VI b) III and IV c) II, IV, V, and VI d) I, III, IV, and Ve) III, IV, and VI

7. What is the height in centimeters of a person who is 6 feet 10 inches tall?

a) 3.3 x 102 cm b) 5.3 x 10„ cm c) 2.1 x 10Á1 cm d) 2.0 x 104 cm e) 2.1 x 102 cm

8. Which response includes all of the following that involve chemical changes, and none that involve physical changes?

I. souring of milk II. melting of silver III. digestion of food IV. burning of coal V. condensation of steam

a) III, IV, and V b) I, II, and III c) I, III, and IV d) II and V e) IV and V

9. What is 16.7 cubic feet expressed in cubic centimeters?

a) 4.73 x 105 cm„ b) 0.159 cm„ c) 510 cm„ d) 1.55 x 104 cm„ e) 1.76 x 10„ cm„

10. What is the area in square millimeters of a rectangle that is 8.632 cm long and 26.41 mm wide?

a) 30.60 mm2 b) 22.80 mm2 c) 3.060 mm2 d) 2280 mm2 e) 0.3060 mm2

11. How many milliliters are there in 1.0 microliter?

a) 1.0 x 10-5 mL b) 1.0 x 10-„ mL c) 1.0 x 10-2 mL d) 1.0 x 10-1 mL e) 1.0 x 10-4 mL

12. The normal boiling point of radon is -95.8 °F. What is this temperature in kelvins?

a) 294 K b) 224 K c) 202 K d) 190 K e) 249 K

13. Which of the following is an extensive property of matter?

a) density b) specific gravity c) melting point d) weight e) color

14. Which of the following are sets of equivalent temperatures?

I. 77øF 25øC 278 K II. 86øF 30øC 303 K

III. 194øF 90øC 363 K IV. 68øF 22øC 251 K

a) III and IV b) I and III c) II and III d) I and II e) II and IV

15. Liquid propane boils at 231K. What is its boiling point in øC?

a) -231øC b) -42øC c) 315 øC d) 42øC e) 504øC

31 Questions with Answers - General Chemistry I | C 150, Exams of Chemistry

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South Carolina State University

Department of Physical Sciences Name:……………………………………...

SGCH1, General Chemistry I, NH VERSION 1 Date…………………………..

1. If an airplane's speed is 850 mi/h, what is its speed in m/s?

a) 4.0 x 10^5 m/s b) 380 m/s c) 1360 m/s d) 40 m/s e) 528 m/s

2. Perform the indicated mathematical operations and express the answer in scientific notation rounded off to the proper number of

significant figures: (8.001 x 10^2 ) x (2.88 x 10^3 ö 2.4 x 10-„) =

a) 9.6 x 10-2^ b) 9.601 x 10Š c) 9.60 x 10Š d) 9.6 x 10^2 e) 9.6 x 10Š

3. Which one of the following lists units of volume in increasing order, i.e., from smallest to largest?

a) milliliter < centiliter < liter < kiloliter < microliter b) centiliter < milliliter < liter < kiloliter < microliter

c) milliliter < centiliter < microliter < kiloliter < liter d) microliter < kiloliter < centiliter < liter < milliliter

e) microliter < milliliter < centiliter < liter < kiloliter

4. What is the specific gravity of nickel if 2.35 cm^3 of nickel has the same mass as 20.9 mL of water at room temperature?

a) 49.2 b) 8.89 c) 2.14 d) 0.112 e) 19.

5. A 10.0 kg piece of metal at 50.0°C is placed in 1000. g of water at 10.0øC in an insulated container. The metal and water come to

the same temperature at 30.6øC. What is the specific heat of metal? The specific heat of water is 4.18 J/gúøC.

a) 0.0216 J/gúøC b) 0.721 J/gúøC c) 0.444 J/gúøC d) 0.0686 J/gúøC e) 0.124 J/gúøC

6. Trying to identify a sample of a pure substance, a student makes the following observations:

I. It has a mass of 5400 g. II. It is 10. cm long, 10. cm wide, and its height is 20. cm.

III. It is a shiny solid at room temperature. IV. It dissolves in hydrochloric acid.

V. It melts at 660 °C. VI. It is a good conductor of electricity.

Which response includes all of these observations that, individually or in combination , would be helpful in identifying the

substance of which the sample is composed?

a) I, II, III, IV, V, and VI b) III and IV c) II, IV, V, and VI d) I, III, IV, and Ve) III, IV, and VI

7. What is the height in centimeters of a person who is 6 feet 10 inches tall?

a) 3.3 x 10^2 cm b) 5.3 x 10„ cm c) 2.1 x 10Á^1 cm d) 2.0 x 10^4 cm e) 2.1 x 10^2 cm

8. Which response includes all of the following that involve chemical changes, and none that involve physical changes?

I. souring of milk II. melting of silver III. digestion of food IV. burning of coal V. condensation of steam

a) III, IV, and V b) I, II, and III c) I, III, and IV d) II and V e) IV and V

9. What is 16.7 cubic feet expressed in cubic centimeters?

a) 4.73 x 10^5 cm„ b) 0.159 cm„ c) 510 cm„ d) 1.55 x 10^4 cm„ e) 1.76 x 10„ cm„

10. What is the area in square millimeters of a rectangle that is 8.632 cm long and 26.41 mm wide?

a) 30.60 mm^2 b) 22.80 mm^2 c) 3.060 mm^2 d) 2280 mm^2 e) 0.3060 mm^2

11. How many milliliters are there in 1.0 microliter?

a) 1.0 x 10-5^ mL b) 1.0 x 10-„^ mL c) 1.0 x 10-2^ mL d) 1.0 x 10-1^ mL e) 1.0 x 10-4^ mL

12. The normal boiling point of radon is -95.8 °F. What is this temperature in kelvins?

a) 294 K b) 224 K c) 202 K d) 190 K e) 249 K

13. Which of the following is an extensive property of matter?

a) density b) specific gravity c) melting point d) weight e) color

14. Which of the following are sets of equivalent temperatures?

I. 77øF 25øC 278 K II. 86øF 30øC 303 K

III. 194øF 90øC 363 K IV. 68øF 22øC 251 K

a) III and IV b) I and III c) II and III d) I and II e) II and IV

15. Liquid propane boils at 231K. What is its boiling point in øC?

a) -231øC b) -42øC c) 315 øC d) 42øC e) 504øC

16. The following statements describe some physical and chemical properties of sucrose (table sugar). Which response includes all

that describe chemical properties, and none that describe physical properties?

I. It is a colorless solid. II. It chars or blackens when heated gently.

III. Its density is 1.6 g/mL. IV. It ignites and burns with a yellow flame when heated strongly.

V. It is usually in the form of small crystals although it can occur as a powder.

a) another combination is the answer b) II, IV, and V c) II and IV d) I, III, and IV e) I and V

17. A cube of metal is 1.42 centimeters on an edge. Its mass is 16.3 grams. What is its density?

a) 4.86 g/cm„ b) 5.69 g/cm„ c) 4.30 g/cm„ d) 4.68 g/cm„ e) 6.14 g/cm„

18. Which of the following statements is incorrect?

b) Nuclear energy is an important kind of potential energy.

c) An object possesses potential energy because of its position or composition.

d) A body in motion possesses kinetic energy because of its motion.

e) Chemical reactions and physical changes that release energy to their surroundings are endothermic.

19. Assuming a magnesium atom is spherical, calculate its volume in nm„. The diameter of a magnesium atom is 3.20 š. The

volume of a sphere is V = (4/3)ãr„. 1š = 1 x10-^1 Œ m (Both of these relationships are exact.) ã = 3.

a) 5.57 x 10-„^ nm„ b) 5.57 x 10-24^ nm„ c) 2.34 x 10-22^ nm„ d) 5.57 x 10„ nm„ e) 1.71 x 10-2^ nm„

20. The freezing point of argon is –189°C. What is its freezing point on the absolute temperature scale?

a) 72 K b) 461 K c) -136 K d) 84 K e) 112 K

21. How many kilojoules are equivalent to 565 calories?

a) 2360 kJ b) 0.135 kJ c) 930 kJ d) 130 kJ e) 2.36 kJ

22. How many kilograms of lead are there in 749 pounds of lead?

a) 1650 kg b) 760 kg c) 340 kg d) 95.1 kge) 28.0 kg

23. Which of the following numbers has 4 significant figures?

a) 0.043090 b) 0.0431 c) 0.0430 d) 0.04309 e) 0.

24. What is the symbol for the element copper? a) Co b) Cu c) Cr d) Cm e) C

25. The sum 2.834 + 5.71520 + 2.12 + 178.1 + 250.2619 expressed to the proper number of significant figures is:

a) 439.0 b) 439.031 c) 439.0311 d) 439.03 e) 439

26. Express 39.34 square yards in square centimeters.

a) 17280 cm^2 b) 3.289 x 10^5 cm^2 c) 7.632 x 10^6 cm^2 d) 1.835 x 10^6 cm^2 e) 0.6417 cm^2

27. Perform the indicated mathematical operations and round off the answer to the proper number of significant figures:

(12.67 x 4.23) ö 23.42 = a) 2.29 b) 2.88 c) 2.2884 d) 2.288 e) 2.