Question 1

Which of the following best describes a hypothesis in the scientific method?

Accepted Answer

A testable explanation for an observation

Question 2

A student measures the mass of a tablet as 545 mg and the mass of aspirin in the tablet as 325 mg. What is the percent of aspirin in the tablet? Use the formula $$	ext{Percent} = \frac{	ext{part}}{	ext{whole}} 	imes 100.$$

Accepted Answer

$$59.6\%$$

Question 3

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

Accepted Answer

Melting ice to form liquid water

Question 4

Convert $$0.000016 to $$scientific notation.

Accepted Answer

$$1.6 	imes 10$$^{-5}$$

Question 5

Which of the following is a compound?

Accepted Answer

NaCl

Question 6

A sample of gas has a volume of $$2.0\ 	ext{L} at a $$pressure of $$1.0\ 	ext{atm}. $$What will the volume be if the pressure is increased to $$4.0\ 	ext{atm}$$, assuming temperature is constant? Use $$P_1V_1 = P_2V_2.$$

Accepted Answer

$$0.5\ 	ext{L}$$

Question 7

Which of the following is an exact number?

Accepted Answer

1 meter = 100 centimeters

Question 8

What is the density of a liquid if $$25.0\ 	ext{g}$$ occupies a volume of $$20.0\ 	ext{mL}$$? Use $$D = \frac{m}{V}.$$

Accepted Answer

$$1.25\ 	ext{g/mL}$$

Question 9

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes have the same number of protons but different numbers of neutrons

Question 10

A food contains 10 g of fat, 5 g of protein, and 20 g of carbohydrate. What is the total energy content in kilocalories (kcal)? (Fat: 9 kcal/g, Protein: 4 kcal/g, Carbohydrate: 4 kcal/g)

Accepted Answer

$$146\ 	ext{kcal}$$

Question 11

Which of the following is a heterogeneous mixture?

Accepted Answer

Salad

Question 12

What is the correct chemical symbol for potassium?

Accepted Answer

K

Question 13

Which group on the periodic table contains the noble gases?

Accepted Answer

Group 8A (18)

Question 14

A sample of water is heated from $$20.0\ ^\circ	ext{C} to$$ $$85.0\ ^\circ	ext{C}. If $$the mass of water is $$50.0\ 	ext{g}$$ and the specific heat is $$4.18\ 	ext{J/g}^\circ	ext{C}$$, how much heat is absorbed? Use $$q = m 	imes SH 	imes \Delta T.$$

Accepted Answer

$$13,585\ 	ext{J}$$

Question 15

Which of the following is a property of metals?

Accepted Answer

Good conductor of electricity

Question 16

What is the atomic number of an atom with 19 protons, 20 neutrons, and 19 electrons?

Accepted Answer

19

Question 17

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

Accepted Answer

$$K = ^\circ	ext{C} + 273$$

Question 18

Which of the following is a chemical property?

Accepted Answer

Ability to rust

Question 19

A block of metal has a mass of $$200\ 	ext{g}$$ and a volume of $$50.0\ 	ext{cm}^3. $$What is its density?

Accepted Answer

$$4.0\ 	ext{g/cm}^3$$

General Chemistry Study Notes: Foundations, Measurements, Matter, and Atoms

Study Guide - Practice Questions

Study Guide - Flashcards