Q: Which formula represents the molarity ($$M) of a $$solution?

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

Q: A sample of water is heated from $$25^\circ C to$$ $$75^\circ C. If $$the mass of water is 100 g and the specific heat is $$4.18 \frac{J}{g \cdot ^\circ C}$$, how much heat is absorbed?

$$q = 100 \times 4.18 \times (75 - 25) = 20,900\ J$$

Question 1

Which of the following best describes a polar solvent?

Accepted Answer

A solvent with molecules that have an uneven distribution of charge, such as water.

Question 2

Which of the following is a strong electrolyte?

Accepted Answer

Sodium chloride ($$NaCl)$$

Question 3

Which equation correctly represents the neutralization reaction between hydrochloric acid and sodium hydroxide?

Accepted Answer

$$HCl + NaOH \rightarrow NaCl + H_2O$$

Question 4

Which of the following acids is triprotic?

Accepted Answer

Phosphoric acid ($$H_3PO_4)$$

Question 5

Why is sodium (Na) easily oxidized to $$Na^+$$?

Accepted Answer

Because sodium has a low ionization energy and readily loses one electron.

Question 6

Which process is an example of corrosion?

Accepted Answer

Iron reacting with oxygen and water to form rust.

Question 7

Which of the following best describes an oxidation reaction?

Accepted Answer

A reaction in which an atom loses electrons.

Question 8

Which formula represents the molarity ($$M) of a $$solution?

Accepted Answer

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

Question 9

Which of the following is a weak base?

Accepted Answer

Ammonia ($$NH_3)$$

Question 10

What is the product when an acid reacts with a metal hydroxide?

Accepted Answer

Salt and water

Question 11

Which equation represents the first law of thermodynamics?

Accepted Answer

$$\Delta E = q + w$$

Question 12

Which of the following is an example of a state function?

Accepted Answer

Enthalpy ($$H)$$

Question 13

A sample of water is heated from $$25^\circ C to$$ $$75^\circ C. If $$the mass of water is 100 g and the specific heat is $$4.18 \frac{J}{g \cdot ^\circ C}$$, how much heat is absorbed?

Accepted Answer

$$q = 100 	imes 4.18 	imes (75 - 25) = 20,900\ J$$

Question 14

Which hydrocarbon will have the highest caloric value per mole?

Accepted Answer

Octane ($$C_8H_{18})$$

Question 15

Which of the following statements about fossil fuels is correct?

Accepted Answer

Coal is primarily composed of carbon and is used for electricity generation.

Question 16

Which of the following reactions is an example of a precipitation reaction?

Accepted Answer

$$AgNO_3(aq) + $$NaCl(aq) \rightarrow AgCl(s) + $$NaNO_3(aq$$)$$

Question 17

Which of the following best describes an endothermic reaction?

Accepted Answer

A reaction that absorbs heat from the surroundings.

Question 18

Which of the following is a correct statement about strong acids?

Accepted Answer

They completely dissociate in water.

Question 19

Which of the following is the correct formula for calculating energy change in a chemical reaction?

Accepted Answer

$$\Delta E = E_{products} - E_{reactants}$$

Question 20

A solution is prepared by dissolving 5.0 moles of NaCl in enough water to make 2.0 L of solution. What is the molarity of the solution?

Accepted Answer

$$M = \frac{5.0}{2.0} = 2.5\ M$$

General Chemistry Exam 2 Review: Chapters 4, 5, and 6 Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard