Q: Which of the following is the correct relationship for converting Celsius to Fahrenheit?

$^\circ \mathrm{F} = (^\circ \mathrm{C} \times \dfrac{9}{5}) + 32$

Question 1

A NASA Mars mission failed because the spacecraft's trajectory corrections were entered in English units instead of metric units. If the on-board computer expected a force in newton-seconds (N·s), but ground engineers provided the value in pound-seconds (lb·s), what is the most likely consequence of this unit mismatch?

Accepted Answer

The spacecraft would receive an incorrect amount of force, potentially causing it to enter the atmosphere at the wrong altitude and disintegrate.

Question 2

Which of the following is the correct SI base unit for temperature?

Accepted Answer

kelvin (K)

Question 3

A student measures the mass of a sample as 0.04560 kg. How many significant figures are in this measurement?

Accepted Answer

5

Question 4

Which of the following statements best describes the difference between mass and weight?

Accepted Answer

Mass is the amount of matter in an object, while weight is the gravitational pull on that matter.

Question 5

Convert a temperature of $25 \, ^\circ \mathrm{C}$ to kelvin.

Accepted Answer

$298.15 \, \mathrm{K}$

Question 6

A cube has a side length of $4.00 \, \mathrm{cm}$. What is its volume in cubic centimeters?

Accepted Answer

$64.0 \, \mathrm{cm}^3$

Question 7

Which of the following is an example of an exact number?

Accepted Answer

The number of centimeters in a meter ($100$)

Question 8

A sample of copper has a mass of $89.6 \, \mathrm{g}$ and a volume of $10.0 \, \mathrm{cm}^3$. What is its density?

Accepted Answer

$8.96 \, \mathrm{g/cm}^3$

Question 9

Which of the following best describes the law of conservation of energy?

Accepted Answer

Energy can be transferred and transformed, but cannot be created or destroyed.

Question 10

A student wants to convert $2.50 \, \mathrm{yards}$ to centimeters. Which of the following conversion factors should be used in the calculation?

Accepted Answer

$1 \, \mathrm{yard} = 91.44 \, \mathrm{centimeters}$

Question 11

Which of the following measurements is reported with the correct number of significant figures if the measuring device has markings every $0.1$ unit?

Accepted Answer

$5.00$

Question 12

A student adds $12.11 \, \mathrm{g}$ and $0.034 \, \mathrm{g}$. What is the correct sum, reported with the proper number of significant figures?

Accepted Answer

$12.14 \, \mathrm{g}$

Question 13

Which of the following is an intensive property?

Accepted Answer

Density

Question 14

A chemical reaction absorbs $150 \, \mathrm{J}$ of energy from its surroundings. Which term best describes this process?

Accepted Answer

Endothermic

Question 15

Which of the following is the correct relationship for converting Celsius to Fahrenheit?

Accepted Answer

$^\circ \mathrm{F} = (^\circ \mathrm{C} 	imes \dfrac{9}{5}) + 32$

Question 16

A student records a measurement as $0.00340 \, \mathrm{m}$. How many significant figures does this value have?

Accepted Answer

3

Question 17

Which SI prefix corresponds to a factor of $10^{-9}$?

Accepted Answer

nano

Question 18

A sample of mercury has a mass of $135.0 \, \mathrm{g}$ and a density of $13.6 \, \mathrm{g/cm}^3$. What is its volume in $\mathrm{cm}^3$?

Accepted Answer

$10.0 \, \mathrm{cm}^3$

Question 19

Which of the following best describes the difference between precision and accuracy?

Accepted Answer

Precision refers to how reproducible measurements are, while accuracy refers to how close measurements are to the true value.

Units, Measurement, and Quantification in General Chemistry

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