Q: Which of the following best describes the relationship between mass, volume, and density?

$$\text{Density} = \dfrac{\text{mass}}{\text{volume}}$$

Question 1

Which of the following statements best explains why an object with a mass of 1 kg on Earth also has a mass of 1 kg on the Moon, but weighs less on the Moon?

Accepted Answer

Mass is an intrinsic property of matter and does not change with location, while weight depends on the gravitational field strength.

Question 2

Order the following metric prefixes from smallest to largest: nano-, milli-, centi-, kilo-.

Accepted Answer

nano- \u003c milli- \u003c centi- \u003c kilo-

Question 3

Which temperature scale does NOT use degrees and starts at absolute zero?

Accepted Answer

Kelvin

Question 4

Convert 409 K to degrees Celsius using the correct formula.

Accepted Answer

$$136^\circ C$$

Question 5

A piece of zinc with a mass of 12.14 g is submerged in 46.3 cm$$^3 of $$water. The water level increases to 48.0 cm$$^3. $$What is the density of zinc?

Accepted Answer

$$7.14\ \mathrm{g/cm^3$}$$

Question 6

Which of the following best describes the difference between precision and accuracy?

Accepted Answer

Precision is how close measurements are to each other; accuracy is how close measurements are to the true value.

Question 7

Which measuring device would provide the most precise measurement of a liquid's volume?

Accepted Answer

Buret

Question 8

Using the rules of significant figures, calculate $$4.0021 - 0.179.$$

Accepted Answer

3.82

Question 9

A species with 12 protons and 10 electrons is:

Accepted Answer

$$\mathrm{Mg}^{2+}$$

Question 10

How many protons, neutrons, and electrons are in $$^{79}_{35}\mathrm{Br}$$?

Accepted Answer

35 protons, 44 neutrons, 35 electrons

Question 11

Which of the following best describes an isotope?

Accepted Answer

Atoms of the same element with different numbers of neutrons

Question 12

What is the average atomic mass of boron if it has two isotopes: $$^{10}\mathrm{B} (19.91$$%, 10.0129 amu) and $$^{11}\mathrm{B} (80.09$$%, 11.0093 amu)?

Accepted Answer

$$10.81\ \mathrm{amu}$$

Question 13

Which of the following is an example of a compound?

Accepted Answer

Sodium chloride ($$\mathrm{NaCl})$$

Question 14

How many molecules are in 1 mole of water ($$\mathrm{H}_2\mathrm{O}$$)?

Accepted Answer

$$6.022 	imes 10$$^{23}$$

Question 15

Which of the following best describes the relationship between mass, volume, and density?

Accepted Answer

$$	ext{Density} = \dfrac{	ext{mass}}{	ext{volume}}$$

Question 16

Which of the following is an exact number?

Accepted Answer

The number of centimeters in a meter

Question 17

A student measures the mass of water four times and gets values very close to each other, but all are higher than the true value. This is an example of:

Accepted Answer

Low accuracy, high precision

Question 18

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

Accepted Answer

$$^\circ F = \dfrac{9}{5} ^\circ C + 32$$

Question 19

Which of the following best describes a cation?

Accepted Answer

An ion with more protons than electrons

Step-by-Step Guidance for Key Introductory Chemistry Questions

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