Question 1

Which of the following is an example of a heterogeneous mixture?

Accepted Answer

Sand and iron filings

Question 2

Which of the following changes is a chemical change?

Accepted Answer

Burning wood

Question 3

A sample of an element has an atomic number of 17 and a mass number of 37. How many neutrons does it contain?

Accepted Answer

$$37 - 17 = 20$$ neutrons

Question 4

Which of the following statements about metals is CORRECT?

Accepted Answer

Metals tend to lose electrons to form positive ions.

Question 5

What is the correct name for the compound $$\mathrm{N_2O_5}$$?

Accepted Answer

Dinitrogen pentoxide

Question 6

Which of the following molecules has a trigonal pyramidal shape according to VSEPR theory?

Accepted Answer

$$\mathrm{NH_3$}$$

Question 7

Balance the following equation: $$\mathrm{C_3H_8} + \mathrm{O_2$} \rightarrow \mathrm{CO_2$} + \mathrm{H_2O}$$

Accepted Answer

$$\mathrm{C_3H_8} + 5\mathrm{O_2$} \rightarrow 3\mathrm{CO_2$} + 4\mathrm{H_2O}$$

Question 8

Which of the following is a double replacement reaction?

Accepted Answer

$$\mathrm{$$AgNO_3$$} + \mathrm{NaCl} \rightarrow \mathrm{AgCl} + \mathrm{$$NaNO_3$$}$$

Question 9

Calculate the molar mass of $$\mathrm{Ca(OH)_2}.$$

Accepted Answer

$$74.10\ \mathrm{g/mol}$$

Question 10

A reaction has the following balanced equation: $$2\mathrm{Al} + 3\mathrm{Cl_2$} \rightarrow 2\mathrm{$$AlCl_3$$}. $$How many moles of $$\mathrm{Cl_2$}$$ are needed to react with 4 moles of $$\mathrm{Al}$$?

Accepted Answer

6 moles

Question 11

Which of the following is the correct formula for Boyle’s Law?

Accepted Answer

$$P_1V_1 = P_2V_2$$

Question 12

A gas has a pressure of 2.0 atm. What is this pressure in mmHg? (1 atm = 760 mmHg)

Accepted Answer

1520 mmHg

Question 13

What is the molarity of a solution prepared by dissolving 10.0 g of NaCl (molar mass = 58.44 g/mol) in enough water to make 0.500 L of solution?

Accepted Answer

$$0.342\ \mathrm{M}$$

Question 14

Which of the following is a characteristic of a strong acid?

Accepted Answer

It completely ionizes in water.

Question 15

Which of the following is the conjugate base of $$\mathrm{$$HCO_3$$^-}$$?

Accepted Answer

$$\mathrm{CO_3$^{2-}}$$

Question 16

If the $$[\mathrm{H_3O^+}] of a $$solution is $$1.0 	imes 10$$^{-4}$$\ \mathrm{M}$$, what is the pH?

Accepted Answer

4.00

Question 17

Which of the following best describes a buffer solution?

Accepted Answer

A solution that resists changes in pH when small amounts of acid or base are added.

Question 18

According to Le Chatelier’s principle, what will happen to the equilibrium position if more reactant is added to a system at equilibrium?

Accepted Answer

The equilibrium will shift to the right (toward products).

Question 19

Which of the following equations represents the dissociation of water?

Accepted Answer

$$2\mathrm{H_2O}(l) \rightleftharpoons \mathrm{H_3O^+}(aq) + \mathrm{OH^-}(aq)$$

Question 20

A patient’s blood pH drops from 7.40 to 7.10. Which of the following best describes this change?

Accepted Answer

The blood has become more acidic, which can be dangerous to health.

CHM101 Final Exam Review: Key Concepts and Study Guide

Guida di studio - Domande di pratica

Study guide - Flashcard