Q: Which of the following is a correct expression for molarity ($$M$$)?

$$M = \frac{\text{moles of solute}}{\text{liters of solution}}$$

Question 1

Which of the following best describes the scientific method as used in chemistry?

Accepted Answer

A set of steps for making observations, forming hypotheses, conducting experiments, and drawing conclusions.

Question 2

A student measures the mass of a sample as 12.345 g. If the balance has a precision of 0.01 g, how many significant figures should the measurement have?

Accepted Answer

2

Question 3

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

Accepted Answer

Iron rusting in moist air.

Question 4

Which law states that mass is neither created nor destroyed in a chemical reaction?

Accepted Answer

Law of Conservation of Mass

Question 5

What is the molar mass of water ($$H_2O$$)?

Accepted Answer

$$18.02\ 	ext{g/mol}$$

Question 6

Which of the following best describes an isotope?

Accepted Answer

Atoms of the same element with different numbers of neutrons.

Question 7

A 50.0 g sample of water absorbs 420 J of heat. If the specific heat capacity of water is $$4.18\ 	ext{J/g} \cdot 	ext{K}$$, what is the temperature change ($$\Delta T) of $$the water?

Accepted Answer

$$2.01\ 	ext{K}$$

Question 8

Which equation represents the Ideal Gas Law?

Accepted Answer

$$PV = nRT$$

Question 9

Which of the following is a correct statement about acids and bases?

Accepted Answer

Acids increase the concentration of $$H_3O^+$$ ions in solution.

Question 10

What is the pH of a solution with $$[H^+] = 1 	imes 10$$^{-4}$$\ 	ext{M}$$?

Accepted Answer

pH = 4

Question 11

Which of the following best describes the difference between ionic and covalent bonding?

Accepted Answer

Ionic bonds involve the transfer of electrons, while covalent bonds involve the sharing of electrons.

Question 12

Which of the following is a correct expression for molarity ($$M$$)?

Accepted Answer

$$M = \frac{	ext{moles of solute}}{	ext{liters of solution}}$$

Question 13

A chemical reaction is at equilibrium. What will happen if more reactant is added to the system?

Accepted Answer

The equilibrium will shift toward the products.

Question 14

Which of the following is a correct statement about the Law of Definite Composition?

Accepted Answer

A chemical compound always contains the same elements in the same proportion by mass.

Question 15

Which of the following is a real-world example of a solution?

Accepted Answer

Saltwater in the ocean.

Question 16

A reaction yields 8.0 g of product, but the theoretical yield is 10.0 g. What is the percent yield?

Accepted Answer

$$80\%$$

Question 17

Which of the following best describes Le Chatelier’s Principle?

Accepted Answer

When a system at equilibrium is disturbed, it will shift to counteract the disturbance.

Question 18

Which of the following is a property of metals?

Accepted Answer

They are good conductors of electricity.

Question 19

Which equation is used to calculate the energy of a photon?

Accepted Answer

$$E = h
u$$

CHEM 150: Fundamental Principles of Chemistry – Syllabus and Course Structure

Guida di studio - Domande di pratica

Study guide - Flashcard