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

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

Question 1

Which of the following statements best describes an element?

Accepted Answer

An element is a substance that cannot be separated into simpler substances by chemical means.

Question 2

A sample of matter is found to have a uniform composition throughout and cannot be separated into simpler substances by physical means. Which classification best fits this sample?

Accepted Answer

Compound

Question 3

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

Accepted Answer

The melting point of ice is $0^	ext{o}C$.

Question 4

Which of the following is an intensive property?

Accepted Answer

Density

Question 5

A student measures the mass of a cube of ice as $7.36$ g and its sides as $2.0$ cm each. What is the density of the ice cube?

Accepted Answer

$0.92$ g/cm$^3$

Question 6

Which of the following best describes a heterogeneous mixture?

Accepted Answer

A mixture in which the substances remain distinct and can be easily identified.

Question 7

Convert $39^	ext{o}C$ to Fahrenheit.

Accepted Answer

$102^	ext{o}F$

Question 8

Which of the following numbers has three significant figures?

Accepted Answer

$1.30 	imes 10^2$

Question 9

A scientist adds $102.50$ mL and $0.231$ mL. What is the correct answer, reported to the proper number of significant figures?

Accepted Answer

$102.73$ mL

Question 10

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

Accepted Answer

$\frac{2.54 	ext{ cm}}{1 	ext{ in}}$

Question 11

A container with a volume of $9.85 	imes 10^2$ cm$^3$ is filled with a gas. The mass of the container and gas is $126.5$ g, and the mass of the empty container is $124.6$ g. What is the density of the gas?

Accepted Answer

$1.9 	imes 10^{-3}$ g/cm$^3$

Question 12

Which of the following statements about accuracy and precision is correct?

Accepted Answer

Accuracy refers to how close a measurement is to the true value, while precision refers to how close multiple measurements are to each other.

Question 13

Which of the following is an example of a chemical property?

Accepted Answer

Hydrogen gas burns in oxygen to form water.

Question 14

Which SI base unit is used to measure temperature?

Accepted Answer

Kelvin

Question 15

A patient’s blood volume is $5.2$ L. What is this volume in cubic meters ($m^3$)?

Accepted Answer

$5.2 	imes 10^{-3}$ $m^3$

Question 16

Which of the following is true about significant figures in multiplication and division?

Accepted Answer

The answer should have as many significant figures as the number with the fewest significant figures.

Question 17

Which of the following is a correct statement about extensive and intensive properties?

Accepted Answer

Extensive properties depend on the amount of matter, while intensive properties do not.

Question 18

A nutrition label states that a food contains $2,400$ mg of sodium. What is this mass in pounds ($lb$), given $1 lb = 453.6$ g?

Accepted Answer

$0.0053$ lb

Question 19

Which of the following is the correct formula to convert Celsius to Kelvin?

Accepted Answer

$K = ^	ext{o}C + 273.15$

Chapter 1: Chemistry—The Central Science (Study Notes)

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