|
|
|
1.
|
A chemical theory that has been known for a long time becomes a law.
|
|
|
2.
|
How many significant figures are there in the number 0.0006428?
|
|
|
3.
|
The density of gasoline is 0.7025 g/mL at 20°C. When gasoline is added to
water:
A) | It will float on top. | B) | It will sink to the bottom. | C) | It will mix so, you
can't see it. | D) | The mixture will improve the running of the
motor. | E) | None of these things will happen. |
|
|
|
The density of a liquid is determined by successively weighing 25, 50, 75, 100,
and 125 mL of the liquid in a 250-mL beaker.
|
|
|
4.
|
If volume of liquid is plotted along the horizontal axis, and total mass of
beaker plus liquid is plotted on the vertical axis:
A) | The x, or horizontal, intercept is the negative value of the weight of the
beaker. | B) | The y, or vertical, intercept is the weight of the empty
beaker. | C) | The slope of the line is 1.0. | D) | The line will pass through the
origin. | E) | The slope of the line is independent of the identity of the
liquid. |
|
|
|
5.
|
The boiling of water is a
A) | physical change because the water merely disappears | B) | physical change
because the gaseous water is chemically the same as the liquid | C) | chemical change
because heat is needed for the process to occur | D) | chemical change because a gas (steam) is given
off | E) | chemical and physical damage |
|
|
|
6.
|
Color changes always indicate a chemical change.
|
|
|
7.
|
How many significant figures are in 0.00110
|
|
|
8.
|
A wavelength of red light is measured at 655 nm. What is this measurement
in cm?
A) | 6.55 cm | C) | 6.55 x 10-5 cm | B) | 0.00655
cm | D) | 6.55 x 10-7
cm |
|
|
|
9.
|
Many classic experiments have given us indirect evidence of the nature of the
atom. Which of the experiments listed below did not give the results described?
A) | The Rutherford experiment proved the Thomson "plum-pudding" model of the
atom to be essentially correct. | B) | The Rutherford experiment was useful in
determining the nuclear charge on the atom. | C) | Millikan's oil-drop experiment showed that
the charge on any particle was a simple multiple of the charge on the electron. | D) | The electric
discharge tube proved that electrons have a negative charge. | E) | All of the above
experiments gave the results described. |
|
|
|
10.
|
Which one of the following statements about atomic structure is false?
A) | An atom is mostly empty space. | B) | Almost all of the mass of the atom is
concentrated in the nucleus. | C) | The protons and neutrons in the nucleus are
very tightly packed. | D) | The number of protons and neutrons is always
the same in the neutral atom. | E) | All of the above statements (A-D) are
true. |
|
|
|
11.
|
Which of the following atomic symbols is incorrect?
|
|
|
12.
|
Which among the following represent a set of isotopes? Atomic nuclei
containing: | I. | 20 protons and 20 neutrons | | II. | 21 protons and 19 neutrons | | III. | 22
neutrons and 18 protons | | IV. | 20 protons and 22 neutrons | | V. | | 21 protons
and 20 neutrons | | | | |
A) | I, II, III | B) | III, IV | C) | I,
V | D) | I, IV and II, V | E) | No isotopes are
indicated. |
|
|
|
13.
|
The number of neutrons in an atom is the same for all neutral atoms of that
element.
|
|
|
14.
|
The number of electrons in an atom is the same for all neutral atoms of that
element.
|
|
|
15.
|
Which of the following are incorrectly paired?
A) | K, alkali metal | B) | Ba, alkaline earth metal | C) | O,
halogen | D) | Ne, noble gas | E) | Ni, transition
metal |
|
|
|
16.
|
Which of the following are incorrectly paired?
A) | Sr, alkaline earth metal | B) | Ta, transition metal | C) | F,
halogen | D) | H, noble gas | E) | Ru, transition
metal |
|
|
|
17.
|
All of the following are characteristics of nonmetals except:
A) | poor conductors of electricity | B) | often bond to each other by forming covalent
bonds | C) | tend to form negative ions in chemical reactions with metals | D) | appear in the upper
left-hand corner of the periodic table | E) | do not have a shiny (lustrous)
appearance |
|
|
|
18.
|
Which of the following is incorrectly named?
A) | Pb(NO3)2, lead(II) nitrate | B) | NH4ClO4, ammonium perchlorate | C) | PO43–, phosphate ion | D) | Mg(OH)2,
magnesium hydroxide | E) | NO3–, nitrite
ion |
|
|
|
Write the formula for:
|
|
|
19.
|
phosphorus trichloride
|
|
|
20.
|
Which of these statements is a consequence (follows from) the Law of Multiple
Proportions?
A) | All samples of chlorine contain 35Cl and 37Cl in the same
(definite) ratio. | B) | The mass of oxygen that is combined with a
fixed mass of nitrogen in each of the binary nitrogen oxides can be expressed as a ratio of small
whole numbers. | C) | The atomic masses of all of the elements in the periodic table have fixed
values. | D) | The % lead by mass in the compound galena is the same for all pure samples obtained
from any source. | E) | None of these is correct |
|
|
|
21.
|
How many protons, neutrons and electrons, in that order are present in the anion
formed by one atom of 79Se?
A) | 34, 34, 45 | D) | 34, 45, 36 | B) | 34, 45, 34 | E) | 36, 45, 36 | C) | 32, 45,
34 |
|
|
|
22.
|
Which statement is INCORRECT?
A) | An atom of 60Zn has an equal number of protons and
neutrons | B) | An atom of 50Mn has an equal number of electrons and
neutrons | C) | An atom of 18O has an equal number of protons and
neutrons | D) | An atom of 41K has an equal number of protons and
electrons | E) | An atom of 238U contains 146 neutrons. |
|
|
|
23.
|
Which compound contains the highest percent by mass of hydrogen?
A) | HCl | B) | H2O | C) | H2SO4 | D) | H2S | E) | HF |
|
|
|
24.
|
Oxides of copper include CuO and Cu2O. You heat 1.51 g of one of
these copper oxides in the absence of air and obtain 1.21 g of Cu.
True or false: You must have
had CuO.
|
|
|
25.
|
The molecular formula always represents the total number of atoms of each
element present in a compound.
|
|
|
26.
|
The limiting reactant in a reaction
A) | has the lowest coefficient in a balanced equation | B) | is the reactant for
which you have the fewest number of moles | C) | has the lowest ratio of moles
available/coefficient in the balanced equation | D) | has the lowest ratio of coefficient in the
balanced equation/moles available | E) | none of these |
|
|
|
27.
|
SO2 reacts with H2S as
follows:
2H2S + SO2 ® 3S + 2H2O
When 7.50
g of H2S reacts with 12.75 g of SO2, which statement applies?
A) | 6.38 g of sulfur are formed. | B) | 10.6 g of sulfur are
formed. | C) | 0.0216 moles of H2S remain. | D) | 1.13 g of H2S
remain. | E) | SO2 is the limiting reagent. |
|
|
|
28.
|
The reactant with the highest molar mass is always the limiting reactant.
|
|
|
29.
|
Polar molecules have an unequal distribution of charge within the
molecule.
|
|
|
30.
|
All of the following are weak acids except
A) | HCNO | B) | HBr | C) | HF | D) | HNO2 | E) | HCN |
|
|
|
31.
|
Which of the following is paired incorrectly?
A) | H2SO4 – strong acid | B) | HNO3
– weak acid | C) | Ba(OH)2 – strong
base | D) | HCl – strong acid | E) | NH3 – weak
base |
|
|
|
32.
|
A 38.1-g sample of SrCl2 is dissolved in 112.5 mL of solution.
Calculate the molarity of this solution.
A) | 27.0 M | B) | 2.14 M | C) | 53.7
M | D) | 0.339 M | E) | none of these |
|
|
|
33.
|
What mass of solute is contained in 256 mL of a 0.838 M
ammonium chloride solution?
A) | 11.5 g | B) | 175 g | C) | 16.3
g | D) | 215 g | E) | 3.27 g |
|
|
|
34.
|
The concentration of a salt water solution that sits in an open beaker decreases
over time.
|
|
|
35.
|
You have equal masses of different solutes dissolved in equal volumes of
solution. Which of the solutes would make the solution having the highest molar concentration?
A) | NaOH | B) | KCl | C) | KOH | D) | LiOH | E) | all the
same |
|
|
|
36.
|
Aqueous solutions of potassium sulfate and ammonium nitrate are mixed together.
Which statement is correct?
A) | Both KNO3 and NH4SO4 precipitate from
solution. | B) | A gas is released. | C) | NH4SO4 will precipitate
from solution. | D) | KNO3 will precipitate from solution. | E) | No reaction will
occur. |
|
|
|
37.
|
The filtrate is the solid formed when two solutions are mixed.
|
|
|
38.
|
When solutions of strontium chloride and sodium sulfate react, which of the
following is a spectator ion?
A) | strontium ion | B) | chloride ion | C) | sodium
ion | D) | sulfate ion | E) | two of these |
|
|
|
39.
|
The net ionic equation for the reaction of aluminum sulfate and sodium hydroxide
contains which of the following species?
A) | 3Al3+(aq) | B) | OH–(aq) | C) | 3OH–(aq) | D) | 2Al3+(aq) | E) | 2Al(OH)3(s) |
|
|
|
40.
|
When solutions of carbonic acid and potassium hydroxide react, which of the
following are NOT present in the complete ionic equation?
A) | hydrogen ion | B) | carbonate ion | C) | potassium
ion | D) | hydroxide ion | E) | water |
|
|
|
41.
|
Which of the following reactions does not involve
oxidation-reduction?
A) | CH4 + 3O2 ® 2H2O +
CO2 | B) | Zn + 2HCl ® ZnCl2 +
H2 | C) | 2Na + 2H2O ® 2NaOH +
H2 | D) | MnO2 + 4HCl ® Cl2 +
2H2O + MnCl2 | E) | All are oxidation-reduction
reactions. |
|
|
|
42.
|
Which of the following statements is(are) true? Oxidation and
reduction
A) | cannot occur independently of each other | B) | accompany all
chemical changes | C) | describe the loss and gain of electron(s), respectively | D) | result in a change
in the oxidation states of the species involved | E) | A, C, and D |
|
|
|
Selecting from the following reagents, indicate which reagents would be mixed to
give the compounds described. | | CuSO4(aq) | | Fe2(CO3)3(s) | NH3(aq) | | | CuCO3(s) | | FeCl3(aq) | Na2SO4(aq) | | | Cr(OH)3(s) | | | H2SO4(aq) | | | | | | | | |
|
|
|
43.
|
FeCl3(aq) + Na2SO4(aq)
|
|
|
44.
|
Complete the following reaction in aqueous solution and select the spectator
ions, Fe(NO3)2 + (NH4)2CO3 ®
A) | Fe2+(aq), NO3-(aq) | B) | NH4+(aq), NO3-(aq) | C) | NH4+(aq), CO32-(aq) | D) | Fe2+(aq),
NH4+(aq), NO3-(aq),
CO32-(aq) | E) | Fe2+(aq),
CO32-(aq) |
|
|
|
45.
|
Identify the precipitate(s) formed (if any) in the following reaction in aqueous
solution, Fe(NO3)2 + (NH4)2CO3 ®
A) | Fe2(CO3)3 | B) | FeCO3(s) | C) | (NH4)2CO3(s) | D) | NH4NO3(s) | E) | No precipitate will be
observed |
|