Q: A cylindrical rod has a volume of $15.7\ \mathrm{cm}^3$ and a height of $5.00\ \mathrm{cm}$. What is the radius of the rod in cm? (Use $V = \pi r^2 h$)

$r = \sqrt{\frac{15.7}{\pi \times 5.00}} = 1.00\ \mathrm{cm}$

Question 1

Which of the following SI prefix multipliers corresponds to the prefix 'nano'?

Accepted Answer

$10^{-9}$

Question 2

A student measures the length of a metal rod using a ruler marked to the nearest 0.1 cm and records the value as 12.345 cm. What is wrong with this measurement?

Accepted Answer

The measurement has too many significant figures.

Question 3

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

Accepted Answer

The number of students in a classroom

Question 4

A cylindrical rod has a volume of $15.7\ \mathrm{cm}^3$ and a height of $5.00\ \mathrm{cm}$. What is the radius of the rod in cm? (Use $V = \pi r^2 h$)

Accepted Answer

$r = \sqrt{\frac{15.7}{\pi 	imes 5.00}} = 1.00\ \mathrm{cm}$

Question 5

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

Accepted Answer

Precision is how reproducible measurements are; accuracy is how close a measurement is to the true value.

Question 6

A student records the mass of a sample as 0.00450 g. How many significant figures does this measurement have?

Accepted Answer

3

Question 7

Convert $2.50\ \mathrm{kg/m}^3$ to $\mathrm{g/cm}^3$.

Accepted Answer

$0.00250\ \mathrm{g/cm}^3$

Question 8

A buret is used to dispense a solution. If the initial reading is 0.00 mL and the final reading is 18.28 mL, what volume was dispensed?

Accepted Answer

18.28 mL

Question 9

Which of the following calculations is rounded correctly according to significant figures? $12.33 	imes 2.1$

Accepted Answer

26

Question 10

A rock sample has a mass of 84.26 g and a volume of 9.4248 cm$^3$. What is its density, rounded to the correct number of significant figures?

Accepted Answer

$8.94\ \mathrm{g/cm}^3$

Question 11

Which of the following is an intensive property?

Accepted Answer

Density

Question 12

If the atmospheric CO$_2$ concentration increased from 317 ppm in 1960 to 389 ppm in 2010, what was the average rate of increase per year?

Accepted Answer

$1.4\ \mathrm{ppm/yr}$

Question 13

A solution has a density of $0.789\ \mathrm{g/mL}$. What volume (in mL) is needed to obtain $19.8\ \mathrm{g}$ of the solution?

Accepted Answer

$25.1\ \mathrm{mL}$

Question 14

Which of the following is a source of systematic error?

Accepted Answer

A balance that is not calibrated

Question 15

What is the correct conversion factor to convert $\mathrm{in}^2$ to $\mathrm{cm}^2$?

Accepted Answer

$1\ \mathrm{in}^2 = 6.4516\ \mathrm{cm}^2$

Question 16

A student adds $73.15$ and $23.4$. What is the correct answer, rounded according to significant figures?

Accepted Answer

$96.6$

Question 17

Which of the following best describes the data set: 10.03 g, 9.99 g, 10.03 g, 9.98 g, with a true value of 10.00 g?

Accepted Answer

Accurate and precise

Question 18

A stone slab has a density of $3.03 	imes 10^3\ \mathrm{kg/m}^3$. What is its density in $\mathrm{g/cm}^3$?

Accepted Answer

$3.03\ \mathrm{g/cm}^3$

Question 19

If the rate of atmospheric CO$_2$ increase remains constant at $1.4\ \mathrm{ppm/yr}$, what is the estimated CO$_2$ concentration in 2050, given it was $389\ \mathrm{ppm}$ in 2010?

Accepted Answer

$445\ \mathrm{ppm}$

Matter, Measurement, and Problem Solving: Foundations of General Chemistry

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