Q: A student needs to convert 3.30 cm to miles. Which of the following conversion factors is NOT necessary for this calculation?

$$1 \text{ h} = 3600 \text{ s}$$

Q: Which of the following best describes the mole in chemistry?

A mole is $$6.02 \times 10$$^{23}$$ of a particular object, such as atoms or molecules.

Q: Which of the following is the correct scientific notation for 2,399,400,100 seconds rounded to 3 significant figures?

$$2.40 \times 10$$^{9}$$ \text{ s}$

Question 1

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

Accepted Answer

Precision refers to how close repeated measurements are to each other, while accuracy refers to how close a measurement is to the true value.

Question 2

A scientist measures the mass of a sample five times and gets the following values: 5.12 g, 5.13 g, 5.11 g, 5.12 g, and 5.13 g. The actual mass is 5.50 g. Which statement is correct?

Accepted Answer

The measurements are precise but not accurate.

Question 3

Convert 0.000300490 meters to scientific notation with 2 significant figures.

Accepted Answer

$$3.0 	imes 10$$^{-4}$$ m

Question 4

Which of the following is an example of a systematic error?

Accepted Answer

A scientist does not zero the balance before measuring mass, resulting in all measurements being off by 0.126 g.

Question 5

Which SI base unit is correctly matched with its quantity?

Accepted Answer

Ampere – Electric current

Question 6

How many significant figures are in the measurement 0.0101010 J?

Accepted Answer

6

Question 7

A student needs to convert 3.30 cm to miles. Which of the following conversion factors is NOT necessary for this calculation?

Accepted Answer

$$1 	ext{ h} = 3600 	ext{ s}$$

Question 8

Which prefix represents a factor of $$10^{-9}$$?

Accepted Answer

nano-

Question 9

A measurement is recorded as 900 V. How many significant figures does this value have?

Accepted Answer

1

Question 10

Which of the following best describes the mole in chemistry?

Accepted Answer

A mole is $$6.02 	imes 10$$^{23}$$ of a particular object, such as atoms or molecules.

Question 11

Which of the following numbers is considered an exact number and does NOT affect significant figures in calculations?

Accepted Answer

1 dozen = 12

Question 12

A student adds 12.11 g, 0.034 g, and 1.3 g. What is the sum, rounded to the correct number of decimal places?

Accepted Answer

$$13.4 g$$

Question 13

Which of the following is the correct scientific notation for 2,399,400,100 seconds rounded to 3 significant figures?

Accepted Answer

$$2.40 	imes 10$$^{9}$$ 	ext{ s}$

Question 14

A sample has a mass of 453.592 g and a volume of 1.00 mL. What is its density in $$	ext{g/cm}^3$$?

Accepted Answer

$$453.6 	ext{ g/cm}^3$$

Question 15

Which of the following is NOT a base SI unit?

Accepted Answer

Liter (L)

Question 16

A student multiplies 0.288 m$$^2 by 8000 m$^3. $$How many significant figures should the answer have?

Accepted Answer

1

Question 17

Which of the following best describes random error?

Accepted Answer

Statistical fluctuations in measured data due to limitations of the measurement device.

Question 18

Which of the following is the correct order of magnitude for the diameter of a human red blood cell, based on the scale of the universe?

Accepted Answer

$$10^{-6}$$ 	ext{ m}$

Question 19

Which of the following is the correct SI prefix for one trillionth ($$10^{-12}$$)?

Accepted Answer

pico-

Measurement and Problem Solving in Chemistry

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