Houston Community College System
Chemistry 1405
Ascorbic Acid or Vitamin-C
TEST # 1
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CHEM 1405
Spring 2015
Test # 1
Name: ______________________________
Answer the Following Questions.
1. According to rounding rules for addition, 27.1 + 34.538 + 37.68 is equal to:
A) 99.318
B) 99.3
C) 99.31
D) 99
2. According to rounding rules for multiplication, 4.556 * 3.36 is equal to:
A) 15.30816
B) 15.3
C) 15.31
D) 15.30
3. The number of significant digits (figures) in 0.0201 L and 1.0050 g are respectively:
A) 3 and 5
B) 3 and 4
C) 2 and 5
D) 2 and 4
4. Which equipment is best suited for measuring 53 mL of water?
A) 10 mL pipet
B) 100 mL graduated cylinder
C) 250 mL beaker
D) 125 mL Erlenmeyer flask
5. What is the term for the amount of substance measured by a laboratory balance?
A) length
B) mass
C) volume
D) weight
6. The correct term for a change of state from solid to gas is:
A) melting
B) sublimation
C) condensation
D) deposition
7. One gram of carbon contains 50,200,000,000,000,000,000,000 atoms. Express this number of
carbon atoms in scientific notation.
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A) 5.02 × 10
22
B) 5.02 × 10
23
21
C) 5.02 × 10
D) 50.2 × 10
C) Kelvin unit (K)
D) Second (s)
8. Which of the following is the basic unit of temperature?
A) grams (g)
B) Liter (L)
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9. What is the symbol for the metric unit micrometer?
A) cm
B) dm
D) μm
C) km
10. What is the name corresponding to the metric symbol mL?
A) megaliter
B) metroliter
C) microliter
D) milliliter
11. According to the metric system, 1 ________ = 1,000 g.
A) Gg
B) Mg
D) μg
C) kg
12. Which of the following is a representative element?
A) B
B) Be
C) Br
D) all of the above
13. Which fourth period transition element has the highest atomic number?
A) Ca
B) Cd
C) Kr
D) Zn
14. A patient with heat stroke has a temperature of 103 0F. What does this read on a Celsius
thermometer?
A) 41 0C
B) 39 0C
C) 38.2 0C
D) 37.2 0C
15. Calculate the number of hours in 13.5 weeks. (round your final answer to 3 sig.figs)
A) 2268 hr
B) 324 hr
C) 2270 hr
D) 463 hr
16. A wood block is 7.25 cm X 1.50 cm X 12.48 cm. What is the volume of the block?
A) 21.23 cm3
B) 13572 cm3
C) 136 cm3
D) 1.36 cm3
17. A plastic bottle contains 3.100 ml of a liquid. The total mass of the bottle and the liquid together is
6.300 g. The mass of the empty bottle is 4.240 g. what is the density of the liquid?
A) 0.665g/ml
B) 1.368 g/ml
C) 1.505 g/ml
D) 2.032 g/ml
18. Stainless steel is composed of iron, manganese, chromium, and nickel. If a 2.00g sample was
analyzed and found to contain 2.75% manganese, what is the mass of manganese in the sample?
A) 1.37 g
B) 0.0550 g
C) 0.750 g
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D)None of these
19. A 50.0 g sample of solid aluminum releases 420.0 calories when cooled from 100.0°C to
60.0°C. What is the specific heat of the metal?
A) 0.168 cal/(g°C)
B) 0.210 cal/(g°C)
C) 0.840 cal/(g°C)
D) 4.76 cal/(g°C)
20. Which of the following laws states that the total mass and energy before a chemical reaction is
equal to the total mass and energy after the reaction?
A) law of conservation of energy
C) law of conservation of mass and energy
B) law of conservation of mass
D) law of definite composition
21. Which of the following describes a substance in the gaseous physical state?
A) The substance has a variable shape.
B) The substance has a variable volume.
C) The substance compresses significantly.
D) all of the above
22. Which is a chemical property?
A) Specific heat = 0.108 cal / (g °C)
B) Is a good conductor of electricity
C) Density = 7.87 g/mL
D) Reacts wtih oxygen to form ferric oxide
23. Which of the following elements is a non-metal?
A) Se
B) B
C) Ar
D) Sr
24. Which of the following chemical elements corresponds to the symbol As?
A) Argon
B) Sulfur
C) Arsenic
D) Strontium
25. CO2 is classified as which of the following?
A) Binary ionic
B) Ternary ionic
C) Binary molecular
D) Ternary molecular
26. Ammonium sulfate, (NH4)2SO4, is used in fertilizer to supply nitrogen to the soil. What is the total
number of atoms in the chemical formula?
A) 13
B) 14
C) 15
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D) 20
27. What is the subatomic particle having a negligible mass and a negative charge?
A) electron
B) neutron
C) proton
D) quark
28. What is the term for the minimum amount of energy to remove an electron from a neutral atom in
the gaseous state?
A) atomic energy
B) electron energy
C) ionization energy
D) nuclear energy
29. How many neutrons are in the nucleus of an atom of 118
50 Sn ?
A) 50
B) 68
C) 118
D) 168
30. Which atom or ion is paired up with an incorrect number of protons, neutrons, and electrons?
A) Na+: 11 p+, 12 n, 10 e–
B) Mg: 11 p+, 12 n, 11 e–
C) F-: 9 p+, 10 n, 10 e–
D) Mg2+: 12 p+, 10 n, 10 e–
31. Each of the following elements is paired with its number of valence electrons. Which of these
answers is incorrect: for Mg, Rn, Cl, and Si respectively:
A) Mg, 2
B) Cl, 5
C) Fr, 1
D) Ar, 8
32. What is the formula of aluminum nitrate?
A) Al(NO3)2
B) Al3NO3
C) Al2(NO3)3
D) Al(NO3)3
33. What is the chemical formula for the manganese(II) ion?
A) Mg2+
B) Mn2+
C) Mg3+
D) Mn3+
34. Which of the following ions is named correctly?
A) N3–: nitride
B) Ca2+: caltrate
C) SO42–: sulfate
D) Fe3+: iron (II) ion
35. What is the name of the compound Cl2O5?
A) dichlorine tetroxide
B) pentoxygen dichloride
C) dichlorine pentoxide
D) dichlorine pentaoxygen
36. What is the systematic name for CrO42-?
A) chromide ion
B) chromite ion
C) chromate ion
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D) chromium ion
37. Which of the following ionic compounds is named incorrectly:
A) CaCl2: calcium chloride
B) Na2SO4: sodium sulfate
C) Fe2(CO3)3: iron (II) carbonate
D) Al2O3: aluminum oxide
38. Which of the following compounds is named incorrectly?
A) HBr, hydrogen bromide
B) N2O, dinitrogen oxide
C) C3O2, dicarbon trioxide
D) N2O5, dinitrogen pentoxide
39. Consider the four elements Na, P, F and Ne. Choose the correct set of answers to the following
questions: Which has the smallest size (radius)? Which is a metal? Which is a halogen?
A) P, Na, F
B) Ne, P, Ne
C) Ne, Na, F
D) F, Na, P
40. Name the following compounds as acids. Which pair is incorrect?
A) HF, hydrofluoric B) HNO3, nitrous acid C) H3PO4, phosphoric acid
D) H2SO4, sulfuric acid
41. Considering the maximum number of electrons that a sublevel can hold, which answer is
incorrect?
A) 5f, 14
B) 6p, 6
C) 3s, 3
D) 4d, 10
42. Which is the correct electron configuration of a neutral phosphorus atom (P)?
A) 1s2 2s2 2p6 3s2 3p3
B) 1s2 2s2 2p3 3s2 3p6
C) 1s1 2s1 2p8 3s2 3p3
D) 1s2 2s2 2p6 3s2 3d10 3p3
43. What is the electron configuration for a titanium (II) ion, Ti2+ ?
A) [Ar]
B) [Ar] 4s2
C) [Ar] 4s0 3d2
D) [Ar] 4s2 3d2
44. Predict the charge of the ion of the following elements based on its position in the periodic table.
Which answer is incorrect:
A) a. Ba  Ba2+
B)b. Li  Li+
C)c. Cl  Cl+
D)d. N  N3-
45. Predict the density for rhodium, Rh, given the density of cobalt, Co, (8.89 g/cm3) and iridium, Ir,
(22.65 g/cm3).
A) 2.01 g/cm3
B) 6.88 g/cm3
C) 13.76 g/cm3
D) 15.77 g/cm3
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