Q: Which of the following is the correct scientific notation for the speed of light, 299,792,458 m/s, to six significant figures?

$2.99792 \times 10^8$ m $\cdot$ s$^{-1}$

Question 1

Which of the following best describes the difference between mass and weight?

Accepted Answer

Mass is the amount of matter in an object and is measured in kilograms, while weight is the force of gravity on an object and is measured in newtons.

Question 2

A pediatrician prescribes 75 mg of amoxicillin per kilogram of body mass per day for a child weighing 28 lbs. The drug is administered twice daily as a liquid containing 125 mg/mL. How many milliliters should be given per dose? (1 kg = 2.205 lbs)

Accepted Answer

3.8 mL

Question 3

Which of the following is a chemical property?

Accepted Answer

Ability to react with oxygen

Question 4

Convert 329.9 K to degrees Celsius using the correct formula.

Accepted Answer

$T_C = T_K - 273.15$

Question 5

Which of the following is an example of a physical change?

Accepted Answer

Melting of ice cubes

Question 6

A colorless liquid sample has a mass of 30.5 g and a volume of 35.1 mL. What is its density in $g \cdot mL^{-1}$?

Accepted Answer

0.87 $g \cdot mL^{-1}$

Question 7

Which of the following is the correct scientific notation for the speed of light, 299,792,458 m/s, to six significant figures?

Accepted Answer

$2.99792 	imes 10^8$ m $\cdot$ s$^{-1}$

Question 8

Which of the following is an intensive property?

Accepted Answer

Density

Question 9

A tennis ball of mass 58.0 g is served at 207.0 km/h. What is its kinetic energy in joules? ($KE = \frac{1}{2}mv^2$, 1 J = 1 kg·m$^2$/s$^2$)

Accepted Answer

95.9 J

Question 10

Which of the following statements about significant figures is correct?

Accepted Answer

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

Question 11

Which of the following is the correct conversion of 515 km to centimeters?

Accepted Answer

$5.15 	imes 10^7$ cm

Question 12

Which of the following is a sign of a chemical change?

Accepted Answer

Formation of a precipitate

Question 13

A square piece of aluminum foil, 22.86 cm on each side, weighs 2.568 g. If the density of aluminum is 2.70 g/mL, what is the thickness of the foil in millimeters?

Accepted Answer

$1.82 	imes 10^{-2}$ mm

Question 14

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

Accepted Answer

$T_K = T_C + 273.15$

Question 15

Which of the following is the correct answer for $8.940 	imes 10^{-5}$ in standard notation?

Accepted Answer

0.00008940

Question 16

Which of the following is the correct SI base unit for the amount of substance?

Accepted Answer

mole (mol)

Question 17

Which of the following is the correct conversion for 225 Mm to meters using scientific notation?

Accepted Answer

$2.25 	imes 10^8$ m

Question 18

Which of the following is a quantitative observation?

Accepted Answer

The mass of the sample is 5.0 g.

Question 19

Which of the following is the correct answer for the combined mass of a penny (2.5271 g) and 49 pennies (124.01 g), rounded to the correct number of significant figures?

Accepted Answer

126.54 g

Question 20

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

Accepted Answer

1 inch = 2.54 cm

Chapter 1: Matter, Measurement, and Problem Solving – General Chemistry Study Notes

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