Q: A laboratory measurement reads $19.05\ \mathrm{mm}$. Convert this value to meters and express your answer in scientific notation with the correct number of significant figures.

$1.905 \times 10^{-2}\ \mathrm{m}$

Q: Which of the following is the correct relationship between meters and nanometers?

$1\ \mathrm{m} = 1 \times 10^{9}\ \mathrm{nm}$

Q: Which of the following is the correct scientific notation for $111.05\ \mathrm{mL}$?

$1.1105 \times 10^{2}\ \mathrm{mL}$

Q: Which of the following is the correct conversion from $19.05\ \mathrm{mm}$ to nanometers ($\mathrm{nm}$)?

$1.905 \times 10^{7}\ \mathrm{nm}$

Question 1

Which of the following is the correct SI base unit and symbol for the amount of substance?

Accepted Answer

Mole, symbol $\mathrm{mol}$

Question 2

A laboratory measurement reads $19.05\ \mathrm{mm}$. Convert this value to meters and express your answer in scientific notation with the correct number of significant figures.

Accepted Answer

$1.905 	imes 10^{-2}\ \mathrm{m}$

Question 3

Which of the following correctly expresses $0.000032$ in scientific notation?

Accepted Answer

$3.2 	imes 10^{-5}$

Question 4

A student measures the mass of a sample three times and records $10.49\ \mathrm{g}$, $9.78\ \mathrm{g}$, and $10.03\ \mathrm{g}$. The average is $10.1\ \mathrm{g}$ with a standard deviation of $0.3\ \mathrm{g}$. What does the standard deviation tell you about these measurements?

Accepted Answer

The spread of the values, which reflects the precision of the measurements.

Question 5

Which of the following is the correct relationship between meters and nanometers?

Accepted Answer

$1\ \mathrm{m} = 1 	imes 10^{9}\ \mathrm{nm}$

Question 6

A graduated cylinder contains a liquid with the meniscus at $21.24\ \mathrm{mL}$. Which digit in this measurement is considered uncertain?

Accepted Answer

The last digit (the 4 in $21.24$)

Question 7

Which of the following is the correct conversion factor for kilo- in the SI system?

Accepted Answer

$1\ \mathrm{km} = 10^3\ \mathrm{m}$

Question 8

A student records a temperature as $27.21\ ^\circ\mathrm{C}$. How many significant figures are in this measurement?

Accepted Answer

4

Question 9

Which of the following best describes accuracy in a set of measurements?

Accepted Answer

How close the measurements are to the true value.

Question 10

How many significant figures are in the measurement $0.0061\ \mathrm{mg}$?

Accepted Answer

2

Question 11

Which of the following is the correct scientific notation for $111.05\ \mathrm{mL}$?

Accepted Answer

$1.1105 	imes 10^{2}\ \mathrm{mL}$

Question 12

A measurement is reported as $0.000532\ \mathrm{mol}$. How many significant figures does this value have?

Accepted Answer

3

Question 13

Which of the following is the correct conversion from $19.05\ \mathrm{mm}$ to nanometers ($\mathrm{nm}$)?

Accepted Answer

$1.905 	imes 10^{7}\ \mathrm{nm}$

Question 14

Which of the following statements about significant figures is correct?

Accepted Answer

Leading zeros never count as significant figures.

Question 15

A student measures the length of an object as $27.21\ \mathrm{cm}$ and another as $27.128\ \mathrm{cm}$. Which measurement is more precise and why?

Accepted Answer

$27.128\ \mathrm{cm}$ is more precise because it has more decimal places.

Question 16

Which of the following is the correct relationship for converting $1\ \mathrm{L}$ to $\mathrm{cm}^3$?

Accepted Answer

$1\ \mathrm{L} = 1000\ \mathrm{cm}^3$

Question 17

A student records the mass of a sample as $0.0520\ \mathrm{g}$. How many significant figures are in this measurement?

Accepted Answer

3

Question 18

Which of the following is the correct prefix and symbol for $10^{-6}$?

Accepted Answer

Micro, $\mu$

Question 19

A student needs to convert $2.30 	imes 10^{-4}\ \mathrm{mol}$ to ordinary notation. What is the correct answer?

Accepted Answer

$0.000230\ \mathrm{mol}$

Question 20

Which of the following best describes precision in a set of measurements?

Accepted Answer

How close the measurements are to each other.

Measurement, SI Units, Scientific Notation, and Significant Figures in General Chemistry

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