Homework answers / question archive / CEM1EA1 — TUTORIAL 1 Multiple Choice 1) Which statement about the scientific method is TRUE? A) The scientific method emphasizes reason as the way to understand the world

CEM1EA1 — TUTORIAL 1 Multiple Choice 1) Which statement about the scientific method is TRUE? A) The scientific method emphasizes reason as the way to understand the world

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CEM1EA1 — TUTORIAL 1

Multiple Choice

1) Which statement about the scientific method is TRUE?

A) The scientific method emphasizes reason as the way to understand the world.

B) The scientific method emphasizes observation and reason as the way to understand the world.

C) The scientific method emphasizes observation and experimentation as the way to understand the world.

D) The scientific method emphasizes scientific laws as the way to understand the world.

E) All of the above statements are false.

2) A sample of wood with a mass of 3.0 grams was burned in an open dish. The ashes weighed 1.2 grams. What happened to the rest of the wood?

A) The remaining mass was destroyed.

B) Nothing, the burned wood simply has a mass of 1.2 grams.

C) The remaining 1.8 grams was converted into gaseous compounds.

D) The remaining 1.8 grams was converted into heat.

E) none of the above

3) The correct scientific notation for the number 0.00050210 is:

A) 5.0210 x 10⁴                             B) 5.021 x 10^-4

C) 5.0210 x 10^-4                            D) 5.021 x 10⁴

E) none of the above

4) The distance between the two hydrogen atoms in a molecule of water is 0.000000000172 m. Express this distance in scientific notation.

A) 1.72 x 10^-9 m                                    B) 0.172 x 10^-10 m

C) 1.72 x 10^-10 m                                   D) 17.2 x 10⁹ m

E) 1.72 x 10¹⁰ m

5) Which of the following statements is NOT part of the rules for determining significant figures?

A) Zeroes to the left of the first non-zero number are not significant.

B) Zeroes between two numbers are significant.

C) Non-zero digits at the end of a number are not significant.

D) Trailing zeroes at the end of a number, but before an implied decimal point are ambiguous.

E) All of the above statements are part of the rules.

6) How many significant digits should be reported in the answer to the following calculation?

(4.3 - 3.7) x 12.3 =

A) 3                                              B) 2

C) 1                                              D) 4

E) none of the above

7) Determine the answer to the following equation with correct number of significant figures:

2.02 + 8.102 - 0.0297 = --------

A) 10.0923                                      B) 10.1

C) 10.09                                          D) 10.092

E) none of the above

8) The correct prefix for the multiplier 1,000,000 is:

A) micro                                 B) milli.

C) mega.                                D) nano.

E) none of the above

9) The correct multiplier for the prefix pico is:

A) 10^-9                      B) 10^-6

C) 10^-12                    D) 10^-3

E) none of the above

10) How many inches are in 25.8 cm?

A) 0.102 B) 28.3

C) 0.0984 D) 10.2

E) none of the above

11) The volume of a cylinder is p r²h, where r is the radius and h is the height. What is the derived Sl unit for the volume of a cylinder?

A) kg m/s³                                         B) Litre

C) cm³                                               D) m³

E) cubic inches

17) How many low dose 81 mg aspirin tablets can be made from 1.21 kg of aspirin?

A) 1.5 x 10⁴ tablets                               B) 1.5 x 10³ tablets

C) 1.5 x 10⁵ tablets                                D) 1.21 x 10³ tablets

E) 1.21 x 10⁴ tablets

18) A room has dimensions of 10.0 ft x 20.0 ft x 8.00 ft. Given that there are three feet in a yard, what is the volume of the room in yd³?

A) 59.3                                   B) 178

C) 1.60 x 10³                          D) 533

E) none of the above

19) A plastic block has dimensions of 2.2 cm x 3.0 cm x 1.5 cm and a mass of 12.4 grams. Will the block float in water and why?

A) No, because the density of the block is 1.3 g/mL which is greater than the density of water.

B) Yes, because the density of the block is 0.80 g/mL which is less than the density of water.

C) Yes, because the density of the block is 1.3 g/mL which is less than the density of water.

D) No, because the density of the block is 0.80 g/mL which is greater than the density of water.

E) none of the above

20) What is the density (g/mL) of an object that has a mass of 14.01 grams and, when placed into a graduated cylinder, causes the water level to rise from 25.2 mL to 33.6 mL?

A) 1.8                                                 B) 0.60

C) 1.7                                                  D) 2.4

E) none of the above

21) The distance from New York City to Washington, DC is approximately 235 miles. Identify the correct solution map to convert from miles to kilometers using the prefix multipliers and the given conversion factors: 1 mile = 5280 ft; 1 ft = 12 in; 1 in = 2.54 cm.

A) 235 mile x 1 ft/5280 mile x 12 in/1 ft x 1 in/2.54 cm x 10^-2 cm/1 m x 1km/10³ m

B) 235 mile x 5280 ft/1 mile x 1 ft/12 in x 2.54 in/1 ft x 1 m/10^-2 cm x 10³ km/ 1m

C) 235 mile x 5280 ft/1 mile x 12 in/1 ft x 2.54 cm/1 in x 10^-2 m/1 cm x 1km/10³ m

D) 235 mile x 12 in/1 ft x 1 in/2.54 cm x 10^-2 cm/1 m x 1 km/10³ m

E) 235 mile x 12 in/1 ft x 2.54 cm/1 in x 1 m/10^-2 cm x 10³ km/1 m

Long questions

Question 1

Tums is a popular remedy for acid indigestion. A typical Tums tablet contains calcium carbonate plus some inert substances. When ingested, it reacts with the gastric juice (hydrochloric acid) in the stomach to give off carbon dioxide gas. When a 1.328-g tablet reacted with 40.00 mL of hydrochloric acid (density: 1.140 g/mL), carbon dioxide gas was given off and the resulting solution weighed 46.699 g. Calculate the number of liters of carbon dioxide gas released if its density is 1.81 g/L.

Question 2

The concentration of carbon monoxide in an urban apartment is 48 ug/m³. What mass of carbon monoxide in grams 1s present in a room measuring 11.0 ft X 11.5 ft X 20 ft?

Equations    1 in. = 2.54 cm         1 km = 0.6214 mi         1 gal = 3.785L