Question 1

Which of the following statements best describes a physical change?

Accepted Answer

A substance changes its state from solid to liquid.

Question 2

Which of the following is a correct balanced equation for the combustion of methane ($$CH_4) in $$oxygen?

Accepted Answer

$$CH_4 + 2O_2$$ \rightarrow $$CO_2 + 2H_2O$

Question 3

A student mixes 0.50 mol of aluminum chloride ($$AlCl_3) $$with excess sodium chloride ($$NaCl). $$How many moles of sodium chloride are needed to produce 1.0 mol of aluminum chloride according to the reaction: $$AlCl_3 + 3$$NaCl \rightarrow $$AlCl_3 + 3$$NaCl$$?

Accepted Answer

3.0 mol

Question 4

Which of the following ions has the formula $$SO_3$$^{2-}$$?

Accepted Answer

Sulfite

Question 5

What is the molarity of a solution made by dissolving 18.0 g of glucose ($$C_6H_{12}O_6$, molar mass = 180.16 g/mol) in enough water to make 0.250 L of solution?

Accepted Answer

$$0.10\ 	ext{M}$$

Question 6

Which of the following is a double replacement reaction?

Accepted Answer

$$AB + CD \rightarrow AD + CB$$

Question 7

Which of the following statements about the kinetic molecular theory of gases is FALSE?

Accepted Answer

Attractive forces between gas molecules are significant under all conditions.

Question 8

A sample of gas occupies 2.0 L at 1.0 atm and 300 K. What will be its volume at 2.0 atm and 300 K?

Accepted Answer

1.0 L

Question 9

Which of the following is the correct Lewis structure for ammonia ($$NH_3$$)?

Accepted Answer

A nitrogen atom with three single bonds to hydrogen atoms and one lone pair.

Question 10

Which of the following best explains why water can self-ionize to form $$H^+$$ and $$OH^-$$ ions?

Accepted Answer

Water molecules collide and transfer a proton from one molecule to another.

Question 11

Which of the following is the correct formula for copper(II) nitrate?

Accepted Answer

$$Cu(NO_3$)_2$$

Question 12

Which of the following statements about oxidation and reduction is correct?

Accepted Answer

Oxidation is the loss of electrons.

Question 13

Which of the following is the correct resonance structure for the carbonate ion ($$CO_3$$^{2-}$$)?

Accepted Answer

Three structures with one double bond and two single bonds, with the double bond rotating among the three oxygen atoms.

Question 14

A solution is prepared by dissolving 5.0 g of $$NaCl in $$enough water to make 500 mL of solution. What is the molarity of the solution? ($$NaCl$$ molar mass = 58.44 g/mol)

Accepted Answer

$$0.17\ 	ext{M}$$

Question 15

Which of the following best describes a synthesis reaction?

Accepted Answer

$$A + B \rightarrow AB$$

Question 16

Which of the following is the correct formula for ammonium sulfite?

Accepted Answer

$$(NH_4$)_2SO_3$$

Question 17

Which of the following statements about periodic trends is correct?

Accepted Answer

Ionization energy decreases down a group.

Question 18

A reaction has $$\Delta G \u003c 0. $$What does this indicate about the reaction?

Accepted Answer

The reaction is spontaneous.

Question 19

Which of the following is the correct formula and charge for the dichromate ion?

Accepted Answer

$$Cr_2O_7$$^{2-}$$

General Chemistry I: Comprehensive Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard