Chapter 1/2
Which of the following is an example of a physical change?
A) grinding coffee beans
B) baking a cake
C) converting water to hydrogen and oxygen
D) digesting a cheeseburger
E) burning coal
A) grinding coffee beans
Which one of the following compounds contains an ion with a 3+ charge?
A) KCl
B) Na2O
C) FeCl3
D) CuCl
E) MgCl2
C) FeCl3
Draw the best Lewis structure for OCl2.
Cl-O-Cl (and full valence electrons)
A solution is prepared by dissolving 18.0 g of NaBr in 142.0 g of water. What is the mass/mass percent (m/m) of NaBr in the solution?
A) 11.25%
B) 12.68%
C) 88.75%
D) 10.52%
E) 18.00%
A) 11.25%
18/(18 + 142) x 100
Which of the following is the strongest acid?
A) H3PO4
B) NH4+
C) NaOH
D) H2CO3
E) HCl
E) HCl
Which is a strong base?
NaOH
Written in scientific notation, 0.000 000 33 is
A) 3.3 × 107.
B) 3.3 × 10-7.
C) 3.3 × 10-8.
D) 3.3 × 108.
E) 3.3.
B) 3.3 × 10-7.
Consider an isotope of sodium with a mass number of 25. The number of neutrons in this isotope of sodium is
A) 11.
B) 14.
C) 16.
D) 25.
E) 32.
B) 14.
How many electrons if it has a +1 charge?
10
Ionic bonding is expected in which of these compounds?
A) Cl2
B) H2
C) OF2
D) HF
E) KF
E) KF
At constant temperature, a sample of helium at 760. torr in a closed container was compressed from 5.00 L to 3.00 L, with no change in amount of gas or temperature. What was the new pressure exerted by the helium on its container?
A) 800. torr
B) 2280 torr
C) 15.0 torr
D) 3820 torr
E) 1270 torr
E) 1270 torr
(V1 P1)/V2
(5.00 L x 760 torr)/3.00 L
SO3 breaks down in a 2 L container at 600°C to form SO2 and O2. At equilibrium, it is found that [SO3] = 0.671 M, [SO2] = 12.2 M, and [O2] = 6.95 × 10-4 M. What is the chemical equilibrium constant (Kc) for this reaction?
2 SO3(g) ⇄ 2 SO2(g) + O2(g)
A) 0.230
B) 0.013
C) 79.14
D) 4.353
E) 0.019
A) 0.230
Kc = (6.95 x 10-4 (12.2)2)/ (0.671)2
What is the conversion factor for the relationship between millimeters and centimeters?
A) 1 mm/1 cm
B) 10 mm/1 cm
C) 1 cm/1 mm
D) 100 mm/1 cm
E) 10 cm/1 mm
B) 10 mm/1 cm
What is the abbreviated electron configuration for nickel (atomic number 28)?
A) [He]2s22p3
B) [Ar]4s23d8
C) [Kr]4s23d8
D) [Ar]4s24p4
E) [Ar]3d8
B) [Ar]4s23d8
The reaction of methane with oxygen to produce carbon dioxide and water is an example of which class of reaction?
CH4(g) + 2O2(g) → CO2(g) + 2H2O(g)
A) single replacement
B) double replacement
C) combination
D) combustion
E) endothermic
D) combustion
According to Boyle's Law, the pressure of a gas increases as the volume decreases because
A) the gas particles get bigger.
B) the kinetic energy of the gas particles increases.
C) the temperature of the gas increases.
D) the gas particles strike the walls of the container with more force.
E) the gas particles strike the walls of the container more often.
E) the gas particles strike the walls of the container more often.
In the following gas phase reaction, what is the effect of adding more NO2 to the starting reaction mixture?
2NO2(g) ⇌ N2O4(g)
A) It would make the reaction more endothermic.
B) It would make the reaction more exothermic.
C) It would slow the reaction down.
D) It would decrease the final quantity of products.
E) It would increase the final quantity of products.
E) It would increase the final quantity of products.
How many liters of soft drink are there in 5.25 qt?
A) 4950 L
B) 55.7 L
C) 4.96 L
D) 5.57 L
E) 5.0 L
C) 4.96 L
5.25 qt (1 gal/4 qt) (3.785 L/1 gal)
The ionization energy of atoms
A) decreases going across a period.
B) decreases going down within a group.
C) increases going down within a group.
D) does not change going down within a group.
B) decreases going down within a group.
ionization energy: Energy required to remove an electron from a neutral atom
How many grams of NO are required to produce 145 g of N2 in the following reaction?
4NH3(g) + 6NO(g) → 5N2(g) + 6H2O(l)
A) 186 g
B) 155 g
C) 125 g
D) 129 g
E) 145 g
A) 186 g
145 g N2 (1 mol N2/28 g N2) (6 mol NO/5 mol N2) (30 g NO/1 mol NO)
When KCl dissolves in water,
A) the Cl- ions are attracted to dissolved K+ ions.
B) the Cl- ions are attracted to the partially negative oxygen atoms of the water molecule.
C) the K+ ions are attracted to Cl- ions on the KCl crystal.
D) the K+ ions are attracted to the partially negative oxygen atoms of the water molecule.
E) the K+ ions are attracted to the partially positive hydrogen atoms of the water molecule.
D) the K+ ions are attracted to the partially negative oxygen atoms of the water molecule.
The name of Al(OH)3 is
A) aluminum trihydroxide.
B) monoaluminum trihydroxide.
C) aluminum hydroxide.
D) aluminum(III) hydroxide.
E) aluminum oxygen hydride.
C) aluminum hydroxide.