Q: A weather forecaster predicts the temperature will reach 31 °C. What is this temperature in Kelvin?

$$K = 31 + 273.15 = 304.15\ \text{K}$$

Q: Convert $$5.0 \times 10^1$\ \text{cm}^3 to $$liters.

$$5.0 \times 10$$^{-2}$$\ \text{L}$$

Q: Which of the following is the correct relationship for converting Celsius to Fahrenheit?

$$^\circ\text{F} = \frac{9}{5}(^\circ\text{C}) + 32$$

Question 1

Which of the following best describes a compound?

Accepted Answer

A pure substance composed of two or more different kinds of atoms chemically combined in fixed proportions.

Question 2

Which separation technique would be most appropriate to separate a mixture of sand and salt water?

Accepted Answer

Filtration

Question 3

A student measures the mass of a sample as 4.00 g and another as 4.0 g. What is the difference in the uncertainty of these measurements?

Accepted Answer

4.00 g has uncertainty in the second decimal place, while 4.0 g has uncertainty in the first decimal place.

Question 4

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

Accepted Answer

Density

Question 5

A weather forecaster predicts the temperature will reach 31 °C. What is this temperature in Kelvin?

Accepted Answer

$$K = 31 + 273.15 = 304.15\ 	ext{K}$$

Question 6

Which of the following is a chemical change?

Accepted Answer

Rusting of iron

Question 7

A cube of gold has a length of 2.00 cm on each side. If the density of gold is $$19.32\ 	ext{g/cm}^3$$, what is the mass of the cube?

Accepted Answer

$$155\ 	ext{g}$$

Question 8

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

Accepted Answer

Mole (mol)

Question 9

Convert $$5.0 	imes 10^1$\ 	ext{cm}^3 to $$liters.

Accepted Answer

$$5.0 	imes 10$$^{-2}$$\ 	ext{L}$$

Question 10

Which of the following statements about mixtures is correct?

Accepted Answer

Homogeneous mixtures have uniform composition throughout.

Question 11

A patient has a temperature of $$38.5\ ^\circ	ext{C}. $$What is the temperature in degrees Fahrenheit?

Accepted Answer

$$101.3\ ^\circ	ext{F}$$

Question 12

Which of the following is the smallest quantity?

Accepted Answer

1 pg

Question 13

Which of the following is a physical property?

Accepted Answer

Boiling point

Question 14

A sample of copper has a mass of $$374.5\ 	ext{g}$$ and a volume of $$41.8\ 	ext{cm}^3. $$What is its density?

Accepted Answer

$$8.96\ 	ext{g/cm}^3$$

Question 15

Which of the following is an example of a heterogeneous mixture?

Accepted Answer

Granite rock

Question 16

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

Accepted Answer

$$^\circ	ext{F} = \frac{9}{5}(^\circ	ext{C}) + 32$$

Question 17

Which of the following is a derived SI unit?

Accepted Answer

Joule (J)

Question 18

A student needs $$15.0\ 	ext{g} of $$ethanol for an experiment. If the density of ethanol is $$0.789\ 	ext{g/mL}$$, how many milliliters of ethanol are needed?

Accepted Answer

$$19.0\ 	ext{mL}$$

Question 19

Which of the following is true about the Law of Constant Composition?

Accepted Answer

The relative number of atoms of each element in a compound is always the same.

Chapter 1: Introduction to Matter, Measurement, and Chemical Foundations

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