Question 1

A sample of 0.50 mol of hydrogen reacts with 1.0 mol of oxygen to form water. What is the limiting reactant and how many grams of water are produced?

$$2H_2(g) + O_2$(g) \rightarrow 2H_2O(l)$$

Accepted Answer

Hydrogen; 9.0 g

Question 2

Which of the following is an example of an intensive property?

Accepted Answer

Density

Question 3

Which of the following orbital-filling diagrams violates Hund's rule?

Accepted Answer

A diagram with two electrons paired in one p orbital before all p orbitals are singly occupied

Question 4

A 5.0 g sample of a metal at 100.0 $$^{\circ}C is $$placed into 100.0 g of water at 25.0 $$^{\circ}C. If $$the final temperature of the water is 27.0 $$^{\circ}C$$, what is the specific heat capacity of the metal? (Assume no heat loss to surroundings. $$c_{water} = 4.18 \ \mathrm{J/g\cdot ^\circ C})$$

Accepted Answer

$$0.42 \ \mathrm{J/g\cdot ^\circ C}$$

Question 5

Which of the following molecules contains the most easily broken carbon-carbon bond?

Accepted Answer

$$CH_2=CH-CH$$=$$CH_2$$

Question 6

Which of the following best describes the shape and bond angles of $$BF_3$$ according to VSEPR theory?

Accepted Answer

Trigonal planar, 120$$^{\circ}$$

Question 7

A student measures the mass of a metal sample as 52.0 g and its volume as 13.0 mL. What is the density of the metal?

Accepted Answer

$$4.00 \ \mathrm{g/mL}$$

Question 8

Which of the following is the correct net ionic equation for the reaction between $$CaCl_2(aq$$)$$ and Na_2CO_3(aq$$)$$?

Accepted Answer

$$Ca^{2+}(aq$$) + $$CO_3$$^{2-}(aq) \rightarrow $$CaCO_3(s$$)$$

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

Consider the reaction: $$2KClO_3(s) \rightarrow 2KCl(s) + 3O_2(g). If 12.0 g of$$ $$KClO_3 is $$decomposed, how many grams of $$O_2$$ are produced? (Molar mass $$KClO_3 = 122.6$$ \ \mathrm{g/mol}$$)

Accepted Answer

4.71 g

Question 11

Which of the following best explains why ionic compounds tend to have high melting points?

Accepted Answer

Strong electrostatic forces between oppositely charged ions

Question 12

Which of the following is the correct electron configuration for $$Cr ($$chromium)?

Accepted Answer

$$[Ar] 4s^1$ 3d^5$

Question 13

Which of the following is a chemical change?

Accepted Answer

Rusting of iron

Question 14

Which of the following elements has the highest first ionization energy?

Accepted Answer

Neon

Question 15

A gas sample occupies 2.50 L at 1.00 atm and 25$$^{\circ}C. $$What will its volume be at 2.00 atm and 25$$^{\circ}C$$?

Accepted Answer

1.25 L

Question 16

Which of the following molecules is polar?

Accepted Answer

$$NH_3$$

Question 17

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

Accepted Answer

$$(NH_4$)_2SO_4$$

Question 18

Which of the following best describes the process of the photoelectric effect?

Accepted Answer

Electrons are ejected from a metal surface when light of sufficient frequency shines on it.

Question 19

Which of the following is the correct name for $$Al_2O_3$$?

Accepted Answer

Aluminum oxide

Question 20

Which of the following is the correct formula for carbon disulfide?

Accepted Answer

$$CS_2$$

General Chemistry Practice Exam Study Guide

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