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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