2.50 \times $$10^3 (3 $$significant figures)

5.3 \times $$10^{-6}$$ \text{ meters}

Question 1

Which of the following numbers has the correct number of significant figures when written in scientific notation as $$2.50 	imes 10^3$?

Accepted Answer

2.50 	imes $$10^3 (3 $$significant figures)

Question 2

A student measures the mass of a sample as 0.073090 g. How many significant figures are in this measurement?

Accepted Answer

6

Question 3

Which of the following is NOT a base unit in the SI system?

Accepted Answer

Liter (L)

Question 4

Convert 4.7 feet to inches using dimensional analysis. (1 foot = 12 inches)

Accepted Answer

56.4 inches

Question 5

Which statement about uncertainty in measurements is correct?

Accepted Answer

Every measurement has some degree of uncertainty.

Question 6

A student records a temperature as 25.160°C. Which digit is considered the uncertain digit?

Accepted Answer

0

Question 7

Which of the following numbers has three significant figures?

Accepted Answer

205

Question 8

When multiplying and dividing measured values, how do you determine the number of significant figures in the answer?

Accepted Answer

Use the measurement with the least significant figures.

Question 9

Express 0.0000053 meters in scientific notation.

Accepted Answer

5.3 	imes $$10^{-6}$$ 	ext{ meters}

Question 10

Which metric prefix represents $$10^{-3}$$?

Accepted Answer

milli

Question 11

A sample of water has a mass of 10.0 g and a volume of 10.0 mL. What is its density?

Accepted Answer

1.00 	ext{ g/mL}

Question 12

Which of the following is a derived unit in the SI system?

Accepted Answer

Cubic meter $$(m^3)$$

Question 13

If you subtract 204.2 from 1.322, how many decimal places should your answer have?

Accepted Answer

One decimal place

Question 14

Which of the following conversion factors is correct for converting inches to centimeters?

Accepted Answer

1 	ext{ in} = 2.54 	ext{ cm}

Question 15

A student wants to convert 8.75 days to minutes. How many minutes are in 8.75 days? (1 day = 24 hours, 1 hour = 60 minutes)

Accepted Answer

12,600 minutes

Question 16

Which of the following is true about zeros in significant figures?

Accepted Answer

Zeros at the end of a number with a decimal point are significant.

Question 17

Which of the following is the correct scientific notation for 1,000,000,000?

Accepted Answer

1.0 	imes $$10^9$$

Question 18

A student multiplies 6.022 	imes $$10^{23} by 6.6260755$$ 	imes $$10^{-34}. $$How many significant figures should the answer have?

Accepted Answer

3

Question 19

Which of the following best describes dimensional analysis?

Accepted Answer

A method for converting units using conversion factors.

Question 20

If the density of water at 4.0°C is 1.0000 g/mL, what is the mass of 250 mL of water at this temperature?

Accepted Answer

250 g

Measurement, Scientific Notation, and Uncertainty in Chemistry

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