1021_1st Exam_1021023
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
1)An ion has 7 protons, 8 neutrons, and 10 electrons. The symbol for the ion is ________.
A) 18O- B) 18O+ C) 15N3+ D) 15N3- E) 15Ne3+
Answer: D
2) How many significant figures are in 4500000. mL?
A) 6 B) 3 C) 5 D) 4 E) 7
Answer: E
3) The compound, ClO , is named
A) chlorine monoxide. B) chlorine (II) oxide.
C) hypochlorite. D) chlorite.
Answer: A
4) The atomic number of an atom of 15O is ________.
A) 23 B) 9 C) 7 D) 8 E) 15
Answer: D
5) A person weighs 77.1 kg. What is his weight in pounds?
A) 35.0 pounds B) 154 pounds C) 30.8 pounds D) 170 pounds E) 193 pounds Answer: D
6) Ammonia is an example of
A) a compound. B) a heterogeneous mixture.
C) an element. D) a homogeneous mixture.
Answer: A
7) What decimal power does the abbreviation µ represent?
A) 1 × 10-12 B) 1 × 10-6 C) 1 × 10-15 D) 1 × 10-3 E) 1 × 10-9
Answer: B
8) Which of the following are examples of a chemical change?
A) copper building materials develop a green patina over time B) a match burns
C) rubbing alcohol evaporates
D) Both A and B are examples of chemical change.
E) All of the above are examples of chemical change.
Answer: D
9)Give the mass percent of oxygen in C14H19NO2.
A) 13.72% B) 8.21% C) 6.00% D) 72.07%
Answer: A
10) Which of the following are examples of intensive properties?
A) mass B) density C) volume
D) None of the above are examples of intensive properties.
E) All of the above are examples of intensive properties.
Answer: B
11) How many moles of PI3 contain 2.55 × 1024 iodine atoms?
A)4.23 moles PI3 B)1.41 moles PI3 C)12.7 moles PI3 D)2.82 moles PI3 E)7.87 moles PI3 Answer: B
12) Identify an anion.
A) An atom that has lost an electron. B) An atom that has lost a neutron.
C) An atom that has gained a proton. D) An atom that has gained an electron.
Answer: D
13) Which of the following elements is a metalloid?
A) C B) Sb C) Br D) Co E) Xe
Answer: B
14)How many atoms of oxygen are in 2.50 moles of CO2?
A) 4.52 x 1024 atoms B) 7.53 x 1023 atoms C) 5.02 x 1023 atoms D) 1.51 x 1024 atoms E) 3.01 x 1024 atoms Answer: E
15) A blueberry scone is an example of
A) an element. B) a heterogeneous mixture.
C) a homogeneous mixture. D) a compound.
Answer: B
16) How many moles are in 2.16 x 1024 atoms of gold?
A) 3.59 moles B) 6.08 moles C) 0.359 moles D) 35.9 moles E) 1.79 moles Answer: A
17) Convert 3 µm to meters.
A) 3 × 10-9 m B) 3 × 10-3 m C) 3 × 10-6 m D) 3 × 106 m
Answer: C
18) Identify the compound with covalent bonds.
A) Li B) NaCl C)CH4 D) Ar E) KBr
Answer: C
19) Which of the following is a molecular compound?
A)SrCl2 B) LiCN C) LiOH D)P4O10 E) ZnS
Answer: D
20) An atom of 131Xe contains ________ protons.
A) 54 B) 185 C) 131 D) 77 E) 123
Answer: A
21) How many significant figures are in 5.206 x 104 m?
A) 8 B) 5 C) 7 D) 4 E) 3
Answer: D
22) What symbol is used to represent the factor 10-1 ?
A) M B) d C) µ D) m
Answer: B
23) What is the empirical formula for C8H16O4 ?
A) CHO B)C2H4O C)C2H5O D)CHO2 E)CH2O
Answer: B
24) Which of the following elements is classified as a semimetal?
A) germanium B) iodine C) uranium D) calcium
Answer: A
25) Which of the following elements is a halogen?
A) F B) O C) Ag D) Ar E) Sb
Answer: A
26) Identify the compound with ionic bonds.
A)O2 B) CO C)H2O D) NaBr E) Ar
Answer: D
27) Which of the following contains the MOST atoms? You shouldn't need to do a calculation here.
A) 10.0 g Ar B) 10.0 g Ba C) 10.0 g Rb D) 10.0 g Mg E) 10.0 g Li Answer: E
28) Which of the following exists as a diatomic molecule?
A) argon B) magnesium C) carbon D) nitrogen E) phosphorus
Answer: D
29) Gasoline is an example of
A) a homogeneous mixture. B) an element.
C) a compound. D) a heterogeneous mixture.
Answer: A
30) How many significant figures are there in the answer for the following problem?
57.5 + 0.9933 + 32 = ?
A) one B) two C) three D) four
Answer: B
31) Which of the following contains BOTH ionic and covalent bonds?
A)MgSO4 B)CaI2 C)SF6 D) COS
E) None of the above contain both ionic and covalent bonds.
Answer: A
32) Determine the mass of an object that has a volume of 88.6 mL and a density of 9.77 g/mL.
A) 866 g B) 98.37 g C) 78.8 g D) 0.110 g E) 9.07 g
Answer: A
33) Identify the crystalline solid.
A) plastic B) glass C) water D) bleach E) table salt
Answer: E
34) Which one of the following elements is a poor conductor of heat and electricity?
A) iron B) lead C) copper D) selenium
Answer: D
35)Write a possible molecular formula for C4H4O.
A) C24H24O6 B)C12H12O2 C)C8H8O D)C2H2O
Answer: A
36) What mass (in kg) does 5.01 moles of iron have?
A) 0.632 kg B) 0.122 kg C) 0.820 kg D) 0.352 kg E) 0.280 kg
Answer: E
37) Isotopes differ in the number of A) gamma particles.
B) electrons.
C) protons and electrons.
D) protons.
E) neutrons.
Answer: E
38) What mass (in g) does 3.99 moles of Kr have?
A) 211 g B) 476 g C) 144 g D) 240 g E) 334 g
Answer: E
39) Cesium belongs to the ________ group of the periodic table.
A) alkaline earth metal B) noble gas
C) alkali metal D) halogen
Answer: C
40) How many protons are in titanium?
A) 25 B) 25.9 C) 26 D) 47.9 E) 22
Answer: E
