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

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

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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