Q: Which of the following is the correct relationship between mass, volume, and density?

$$\text{Density} = \dfrac{\text{Mass}}{\text{Volume}}$$

Question 1

Which of the following best describes a scientific law?

Accepted Answer

A brief statement that summarizes past observations and predicts future ones.

Question 2

A student mixes sand and salt in a beaker. Which of the following best describes the resulting material?

Accepted Answer

A heterogeneous mixture

Question 3

Which of the following is a chemical property?

Accepted Answer

Flammability

Question 4

Which separation technique would be most appropriate to separate a mixture of salt dissolved in water?

Accepted Answer

Distillation

Question 5

A sample of an unknown metal has a mass of $$13.5\ \mathrm{g}$$ and a volume of $$5.0\ \mathrm{cm}^3. $$What is its density?

Accepted Answer

$$2.7\ \mathrm{g/cm}^3$$

Question 6

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes of an element have the same number of protons but different numbers of neutrons.

Question 7

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

Accepted Answer

$$K = C + 273.15$$

Question 8

A neutral atom of magnesium has an atomic number of 12 and a mass number of 24. How many neutrons does it contain?

Accepted Answer

12

Question 9

Which of the following best explains why metals are good conductors of electricity?

Accepted Answer

They have loosely bound electrons that can move freely.

Question 10

Which of the following is a derived SI unit?

Accepted Answer

Liter (L)

Question 11

A student wants to convert $$25\ \mathrm{cm}^3 to $$milliliters. What is the correct answer?

Accepted Answer

$$25\ \mathrm{mL}$$

Question 12

Which of the following statements about the Rutherford gold foil experiment is correct?

Accepted Answer

It demonstrated that most of the atom is empty space.

Question 13

Which group on the periodic table tends to gain one electron to form a $$1^-$$ ion?

Accepted Answer

Halogens (Group 7A)

Question 14

A sample contains $$3.0\ \mathrm{g} of a $$substance with a density of $$0.60\ \mathrm{g/mL}. $$What is its volume?

Accepted Answer

$$5.0\ \mathrm{mL}$$

Question 15

Which of the following is NOT a physical property?

Accepted Answer

Corrosiveness

Question 16

Which of the following best describes a compound?

Accepted Answer

A substance composed of two or more elements in fixed, definite proportions.

Question 17

Which of the following is the correct relationship between mass, volume, and density?

Accepted Answer

$$	ext{Density} = \dfrac{	ext{Mass}}{	ext{Volume}}$$

Question 18

A main-group metal forms an ion with the same number of electrons as the nearest noble gas by:

Accepted Answer

Losing electrons to form a cation

Question 19

Which of the following is the correct definition of an atomic number?

Accepted Answer

The number of protons in the nucleus of an atom

Question 20

A student measures a length as $$12.30\ \mathrm{cm}$$ and another as $$0.56\ \mathrm{cm}. $$What is the correct sum, reported with the proper number of significant figures?

Accepted Answer

$$12.9\ \mathrm{cm}$$

Foundations of Chemistry: Matter, Measurement, and Atomic Structure

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