Q: Which of the following is a correct conversion factor for inches to centimeters?

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

Question 1

Which of the following best describes the difference between a compound and a homogeneous mixture?

Accepted Answer

A compound has a fixed composition and can only be separated into its elements by a chemical reaction, while a homogeneous mixture has variable composition and can be separated by physical means.

Question 2

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

Accepted Answer

$3.8$ mL

Question 3

Which of the following is an example of an intensive property?

Accepted Answer

Density

Question 4

A sample of gold is hammered into a thin sheet. Which type of property is being demonstrated?

Accepted Answer

Physical property

Question 5

Which of the following best illustrates the law of definite composition?

Accepted Answer

Water from any source always contains hydrogen and oxygen in a mass ratio of 1:8.

Question 6

A nugget has a mass of $163.0$ g and displaces water from $50.0$ mL to $58.5$ mL. What is its density in $g/cm^3$? Is it gold? (Density of gold = $19.2$ $g/cm^3$)

Accepted Answer

$8.5$ $g/cm^3$, not gold

Question 7

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

Accepted Answer

$T(K) = T(\degree C) + 273.15$

Question 8

Which of the following is a chemical change?

Accepted Answer

Burning a Cheeto in a campfire

Question 9

Which of the following statements about significant figures is correct?

Accepted Answer

Zeros between nonzero numbers are always significant.

Question 10

Which of the following is the empirical formula for hydrogen peroxide ($H_2O_2$)?

Accepted Answer

$HO$

Question 11

A student measures the mass of a penny five times and gets: $2.5270$, $2.5271$, $2.5272$, $2.5271$, $2.5271$ g. What does this indicate about the measurements?

Accepted Answer

They are precise but not necessarily accurate.

Question 12

Which of the following best describes the energy change during condensation?

Accepted Answer

Energy is released as a gas turns into a liquid.

Question 13

Which of the following is the correct SI base unit for temperature?

Accepted Answer

Kelvin

Question 14

Which of the following is a correct conversion factor for inches to centimeters?

Accepted Answer

$1 	ext{ in} = 2.54 	ext{ cm}$

Question 15

Which of the following best describes the difference between potential and kinetic energy?

Accepted Answer

Kinetic energy is the energy of motion, while potential energy is stored due to position or composition.

Question 16

A solution of vinegar is best classified as which of the following?

Accepted Answer

Homogeneous mixture

Question 17

Which of the following is the correct formula for kinetic energy?

Accepted Answer

$KE = \frac{1}{2}mu^2$

Question 18

A waist size of 34 inches is measured. Will a European medium (76-80 cm) fit? (1 in = 2.54 cm)

Accepted Answer

Yes, because 34 inches is about 86 cm.

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

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