Q: Convert $$7.6 nm to cm. $$Use dimensional analysis and scientific notation.

$$7.6 \times 10$$^{-7}$$\ \mathrm{cm}$$

Q: How many microseconds are in $$0.005$$ seconds?

$$5 \times 10^3$\ microseconds$

Question 1

Which of the following numbers has exactly three significant figures?

Accepted Answer

$$0.00450$$

Question 2

How many significant figures are in the measurement $$0.07090 g$$?

Accepted Answer

$$4$$

Question 3

A student measures the mass of a sample as $$15.85 g $$and its volume as $$6.01 cm$^3. $$What is the density of the sample, reported with the correct number of significant figures?

Accepted Answer

$$2.64\ \mathrm{g/cm^3$}$$

Question 4

Which of the following is an exact number?

Accepted Answer

$$100$$\ pennies\ in\ a\ dollar$

Question 5

Convert $$7.6 nm to cm. $$Use dimensional analysis and scientific notation.

Accepted Answer

$$7.6 	imes 10$$^{-7}$$\ \mathrm{cm}$$

Question 6

A patient is prescribed $$50 mg of a $$drug per day. Each tablet contains $$25 mg. $$How many tablets should the patient take per day?

Accepted Answer

$$2$$

Question 7

Which of the following best describes the arrangement and movement of particles in a liquid?

Accepted Answer

Particles are close together but can move past each other; shape is not fixed, volume is fixed.

Question 8

Convert $$405$$ minutes to hours and seconds.

Accepted Answer

$$6.75$$\ hours\ and\ 24,300\ seconds$

Question 9

Which of the following is the correct formula for converting Fahrenheit to Celsius?

Accepted Answer

$$C = \frac{F - 32}{1.8}$$

Question 10

A sample has a density of $$0.785 g/cm$^3$$ and a mass of $$500$$ grams. What is its volume?

Accepted Answer

$$637\ \mathrm{cm^3$}$$

Question 11

Which of the following is the correct scientific notation for $$613,000$$?

Accepted Answer

$$6.13 	imes 10^5$

Question 12

How many microseconds are in $$0.005$$ seconds?

Accepted Answer

$$5 	imes 10^3$\ microseconds$

Question 13

Which of the following statements about significant figures is TRUE?

Accepted Answer

Trailing zeros after a decimal point are always significant.

Question 14

A calorimeter experiment shows that $$150 J of $$energy is required to raise the temperature of $$1 g of $$water by $$T$$ degrees Celsius. What is $$T$$?

Accepted Answer

$$35.9\ ^\circ\mathrm{C}$$

Question 15

Which of the following is the correct conversion factor for $$1$$ inch to centimeters?

Accepted Answer

$$1\ \mathrm{in} = 2.54\ \mathrm{cm}$$

Question 16

What is absolute zero on the Celsius scale?

Accepted Answer

$$-273.15\ ^\circ\mathrm{C}$$

Question 17

A solution contains $$4.5 mL of $$phenol. If the concentration is $$20.0 mg $$per $$7.5 mL$$, how many mg of phenol are present?

Accepted Answer

$$12\ \mathrm{mg}$$

Question 18

Which of the following best describes kinetic energy?

Accepted Answer

Energy of motion

Question 19

Which of the following is the correct method for rounding $$207.514 to $$three significant figures?

Accepted Answer

$$208$$

Chemistry Basics: Matter, Measurement, and Significant Figures

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