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Chemistry Exam 1

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Chemistry practice test for Exam 1
Charlotte Wright
Quiz by Charlotte Wright, updated more than 1 year ago
Charlotte Wright
Created by Charlotte Wright about 9 years ago
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Question 1

Question
Which term best describes the following? There is only one correct answer. Diamond (consisting of only carbon) is ______(i)___________, the transparent gemstone sapphire (aluminum oxide with other trace minerals present) is _______(ii)______________ and sucrose (table sugar) is _______(iii)_________.
Answer
  • A) (i) an element; (ii) a solution; (iii) a compound
  • B) (i) a compound; (ii) a heterogenous mixture; (iii) a homogenous mixture
  • C) (i) a homogenous mixture; (ii) a heterogenous mixture; (iii) a compound
  • D) (i) an element; (ii) a compound; (iii) a compound
  • E) (i) a compound; (ii) a solution; (iii) a solution

Question 2

Question
Which of the following answers is written properly with regard to significant figures for the following calculation: (21.45-19.6) ----------------- 28.5
Answer
  • a) 0.06
  • b) 0.065
  • c) 0.0649
  • d) 0.06491
  • e) 0.0064912

Question 3

Question
Consider the following processes: (i) making Kool-Aid by dissolving Kool-Aid mix and sugar in water. (ii) carbonating water by pressurization with carbon dioxide (iii) corrosion of metal on your car (iv) burning your chemistry textbook (v) condensation of water vapor from your breath on a mirror Which of these processes are correctly referred to as a "physical change"?
Answer
  • a) (i), (iii) and (v)
  • b) (ii) and (iii)
  • c) (ii) and (iv)
  • d) (ii), (iii), (iv), and (v)
  • e) (i), (ii), and (v)

Question 4

Question
You have a piece of gold with a mass of 483.0 grams. You have a graduated cylinder containing 50.0 mL of water. You add the piece of gold to the graduated cylinder, it sinks to the bottom and the water level rises to read 75.0 mL. What is the density of the gold.
Answer
  • a) 19.3 g/cm^3
  • b) 6.44 g/cm^3
  • c) 1.45 x 10^2 g/cm^3
  • d) 161 g/cm^3
  • e) 7.78 x 10^4 g/cm^3

Question 5

Question
1.00 g/cm^3 equals ____________ kg/m^3.
Answer
  • a) 1.00 x 10^-1
  • b) 1.00 x 10^6
  • c) 1.00 x 10^1
  • d) 1.00 x 10^3
  • e) 1.00 x 10^-6

Question 6

Question
An elemental ion has 34 protons, 36 electrons, and 44 neutrons. What isotope is it?
Answer

Question 7

Question
The Rutherford experiment, in which thin gold foil was bombarded with alpha particles (helium nuclei) showed that:
Answer
  • a) The atom consists of protons, electrons, and neutrons.
  • b) The electron has a charge equal and opposite to that of the proton.
  • c) The space occupied by atoms is mostly empty space.
  • d) Electrons orbit the nucleus with defined motions.
  • e) All of the above.

Question 8

Question
Which of the following formulas are INCORRECTLY written?
Image:
bf352c67-210d-4d84-9c07-5f6922af2ff1.gif (image/gif)
Answer
  • a) (iii)
  • b) (iii), (v), (vii)
  • c) (iii), (v), (vi)
  • d) (iv), (v), (vi), (vii)
  • e) (iii), (v), (vi), (vii)

Question 9

Question
The best name for H2Se when it is classified as an acid is ______(i)_______; the best name for N2F4 is ________(ii)______; and the best name for Mg3As2 is ______(iii)__________.
Answer
  • a) (i) hydroselenic acid; (ii) dinitrogen tetraflouride; (iii) dimagnesium triarsenide
  • b) (i) hydroselenic acid; (ii) dinitrogen tetraflouride; (iii) magnesium arsenide
  • c) (i) selenic acid; (ii) dinitrogen tetraflouride; (iii) dimagnesium triarsenide
  • d) (i) selenic acid; (ii) dinitrogen tetraflouride; (iii) magnesium arsenide
  • e) (i) hydroselenic acid; (ii) nitrogen flouride; (iii) dimagnesium triarsenide

Question 10

Question
Which group of elements is most likely to gain two electrons to form a stable ion?
Answer
  • a) 1A
  • b) 2A
  • c) 5A
  • d) 6A
  • e) 7A

Question 11

Question
If perbromic acid has the formula HBrO4, what is the formula for bromous acid?
Answer
  • a) HBrO
  • b) HBrO2
  • c) HBrO3
  • d) HBr
  • e) H2BrO4

Question 12

Question
For the combustion of the hydrocarbon octane (C8H18) in air, what is the coefficient in front of O2 when the chemical equation for the reaction is properly balanced?
Answer
  • a) 12
  • b) 24
  • c) 25
  • d) 13
  • e) 16

Question 13

Question
Determine the formula weight for ammonium carbonate.
Answer
  • a) 138.05 amu
  • b) 86.99 amu
  • c) 78.05 amu
  • d) 96.09 amu
  • e) 156.10 amu

Question 14

Question
How many moles of glucose C6H12O6 are present in 100.0 grams of glucose?
Answer
  • a) 3.317 x 10^23 moles
  • b) 1.802 moles
  • c) 0.5551 moles
  • d) 1.802 x 10^4 moles
  • e) 3.015 x 10^-24 moles

Question 15

Question
How many total atoms are present in 0.150 moles of acetic acid, C2H4O2?
Answer
  • a) 7.23 x 10^23
  • b) 4.82 x 10^24
  • c) 1.13 x 10^22
  • d) 3.21 x 10^24
  • e) 9.03 x 10^22

Question 16

Question
Butyric acid is responsible for the rancid odor you smell when certain foods decompose. Butyric acid is composed of 54.53% C, 9.152%H and 36.32% O by mass. What is the empirical formula for butyric acid?
Answer
  • a) C5H9O2
  • b) C2H4O
  • c) C2H3O2
  • d) C4H9O4
  • e) C2H2O

Question 17

Question
Given the balanced chemical equation and chemical formulas for the combustion of butane: 2C4H10 + 13O2 --> 8CO2 + 10H2O
Answer
  • a) 1 mol C4H10 ------------------- 4 mol CO2
  • b) 2mol C4H10 ------------------ 13 mol O2
  • c) 13 mol O2 --------------- 8 mol CO2
  • d) 10 mol H2O ----------------- 13 mol CO2

Question 18

Question
Glucose is your body's preferred energy source. Your body burns glucose in a series of reactions that add together to give the net reaction for glucose combustion show below: C6H12O6 + 6O2 --> 6CO2 + 6H2O You expel CO2 produced from this process each time you breathe out. How many grams of CO2 will be produced from the complete metabolism (combustion) of 355 grams of glucose?
Answer
  • a) 86.7 g CO2
  • b) 520. g CO2
  • c) 14.5 g CO2
  • d) 8.72 x 10^3 g CO2
  • e) 242 g CO2

Question 19

Question
If 4.0 moles of Fe and 6.0 moles of O2 are used in the reaction 4Fe + 2O2 --> 2Fe2O3, then the limiting reactant is __________________ and the theoretical yield of Fe2O3 is ____________________ mol.
Answer
  • a) O2, 2.0 mol Fe2O3
  • b) O2, 4.0 mol Fe2O3
  • c) Fe, 4.0 mol Fe2O3
  • d) Fe, 2.0 mol Fe2O3

Question 20

Question
If you dissolve 0.30 moles of ammonium nitrate in 0.70 liters of solution, what is the total concentration, in moles/liter, of all of the ions present in solution?
Answer
  • a) 0.43 M ions
  • b) 0.86 M ions
  • c) 0.21 M ions
  • d) 0.42 M ions
  • e) 0.30 M ions

Question 21

Question
What are the spectator ion(s) for the reaction of the /insoluble salt/ "milk of magnesia", Mg(OH)2, with hydrochloric acid in your stomach.
Answer
  • a) Cl- only
  • b) Mg2+ and Cl-
  • c) Mg2+ only
  • d) H+ and OH-
  • e) H+ and Cl-

Question 22

Question
Consider the following compounds, all of which are soluble in water. Which if these compounds would you expect to behave as STRONG electrolyte(s) in solution?
Image:
d688cd0d-4757-4441-ae4f-50e6a257256c.gif (image/gif)
Answer
  • a) I and IV only
  • b) I, III, and IV only
  • c) II and IV only
  • d) II and V only
  • e) II, IV and V only

Question 23

Question
What mass of potassium chloride is needed to prepare 0.750 liters of a 0.250 M KCl solution?
Answer
  • a) 224 g
  • b) 398 g
  • c) 14.0 g
  • d) 0.0715 g
  • e) 18.6 g

Question 24

Question
Which class of reaction is the following reaction best described by? BaCl2(aq) + Na2SO4(aq) --> BaSO4(s) + 2NaCl(aq)
Answer
  • a) precipitation
  • b) oxidation/reduction
  • c) neutralization of acid and/or base
  • d) gas generation
  • e) more than one of the above are correct

Question 25

Question
You have 250.0 mL of 6.00 M NaOH which you dilute to a final volume of 1.75 liters by adding water. What is the new concentration of NaOH in the diluted solution?
Answer
  • a) 2.62 M
  • b) 0.857 M
  • c) 42.0 M
  • d) 1.50 M
  • e) 0.0417

Question 26

Question
Which of the following are correctly referred to as "extensive properties"? (i) mass of a substance (ii) mols of a substance (iii) density of a substance (iv) molarity of a substance (v) volume of a substance
Answer
  • a) (i) and (ii)
  • b) (iii) and (v)
  • c) (iii) and (iv)
  • d) (ii), (iii), (iv), and (v)
  • e) (i), (ii), and (v)

Question 27

Question
When the following calculation is performed properly, how many significant figures should be reported in the answer? (99.31 + 0.754) --------------------- 155.81
Answer
  • a) 1
  • b) 2
  • c) 3
  • d) 4
  • e) 5

Question 28

Question
Which of the following scientific observations supports the following statement: "Lime is not an element".
Answer
  • a) Lime and carbon dioxide are produced when limestone is heated.
  • b) Lime reacts with water, generating a large amount of heat.
  • c) When a pure metal of known composition is burned in oxygen, lime is produced as the only reaction product.
  • d) Lime has a melting point of 2572 degrees Celsius.
  • e) None of these statements support the statement that "Lime is not an element."

Question 29

Question
How many mL of mercury with a density of 13.6 g/mL will have the same mass as 50.0 mL of hexane with a density of 0.655 g/mL?
Answer
  • a) 445
  • b) 0.178
  • c) 2.41
  • d) 5.62
  • e) 0.415

Question 30

Question
1.0 kg/cm^3 equals _______________ ug/m^3
Answer
  • a) 1.0 x 10^11
  • b) 1.0 x 10^15
  • c) 1.0 x 10^12
  • d) 1.0 x 10^3
  • e) 1.0 x 10^-3

Question 31

Question
What is the correct formula for the species that has 44 protons, 56 neutrons and 42 electrons?
Answer

Question 32

Question
For neutral atoms which statement is CORRECT?
Answer
  • a) neutral atoms of different elements may have the same number of electrons
  • b) neutral atoms of different elements may have the same number of neutrons
  • c) neutral atoms of different elements may have the same number of protons
  • d) none of (a) to (c) is/are correct
  • e) all of (a) to (c) is/are correct

Question 33

Question
Which of the following formulas are INCORRECTLY written?
Image:
de4ea342-ab61-4097-8908-38e91324e8a9.gif (image/gif)
Answer
  • a) (iii), (v), (viii)
  • b) (ii), (v), (vii)
  • c) (ii), (iv), (vi)
  • d) (i), (ii), (iv), (v), (vii)
  • e) (iv), (v), (vi), (viii)

Question 34

Question
The best name for N2O4 is _____(i)________; the best name for Al2S3 is __________(ii)________; and the best name for NiCl2 is ______(iii)_________.
Answer
  • a) (i) dinitrogen tetraoxide; (ii) aluminum sulfide; (iii) nickel (II) chloride
  • b) (i) dinitrogen tetraoxide; (ii) dialuminum trisulfide; (iii) nickel dichloride
  • c) (i) nitrogen oxide; (ii) aluminum sulfide; (iii) nickel chloride
  • d) (i) nitrogen oxide; (ii) dialuminum trisulfide; (iii) nickel (II) dichloride
  • e) (i) dinitrogen tetraoxide; (ii) aluminum sulfide; (iii) nickel chloride

Question 35

Question
Which of the following should be the most similar in chemical property to strontium (Sr)?
Answer
  • a) Y
  • b) Xe
  • c) Rb
  • d) Ba
  • e) Sc

Question 36

Question
When named as an acid, H2CO3 is called:
Answer
  • a) dihydrogen carbonate
  • b) carbonic acid
  • c) carbonous acid
  • d) hydrocarbonous acid
  • e) dihydrocarbonous acid

Question 37

Question
For the combustion of the hydrocarbon hexane (C6H14) in air, what is the coefficient in front of H2O when the chemical equation for the reaction is properly balanced?
Answer
  • a) 6
  • b) 7
  • c) 12
  • d) 14
  • e) 4

Question 38

Question
Determine the formula weight for calcium nitrate.
Answer
  • a) 164.086 amu
  • b) 102.082 amu
  • c) 204.164 amu
  • d) 142.160 amu
  • e) 148.248 amu

Question 39

Question
How many moles of glycerol, C3H8O3, are present in 415 g of glycerol?
Answer
  • a) 4.51 mol
  • b) 0.222 mol
  • c) 3.82 x 10^4 mol
  • d) 2.62 x 10^-5 mol
  • e) 1.58 x 10^19 mol

Question 40

Question
Acetone, formula C3H6O is an organic compound found in some solvents, and is also produced by the body during starvation and in uncontrolled diabetes. How many hydrogen atoms are present in 50.0 grams of acetone?
Answer
  • a) 1.04 x 10^24
  • b) 8.64 x 10^22
  • c) 3.11 x 10^24
  • d) 5.18 x 10^23
  • e) 1.17 x 10^23

Question 41

Question
Mothballs are made of naphthalene, a C and H containing compound. The mass % of C in naphthalene is 93.71%, while the mass % of H is 6.29%. What is the empirical formula for naphthalene?
Answer
  • a) C14H
  • b) C8H16
  • c) CH
  • d) C5H4
  • e) C9H6

Question 42

Question
For the combustion of hydrogen and oxygen gases: 2H2 + O2 --> 2H2O How many moles of O2 are required to produce 7.0 moles of H2O?
Answer
  • a) 7.0
  • b) 3.5
  • c) 14.0
  • d) 2.0
  • e) 1.0

Question 43

Question
A simple way to prepare oxygen in the laboratory is by the decomposition of potassium chlorate, which occurs upon heating: 2KClO3(s) --> 3O2(g) + 2KCl(s) Assuming the reaction goes to completion, if 10.0 grams of KClO3 are decomposed according to the balanced chemical equations shown above, what mass of O2 will be produced?
Answer
  • a) 1.74 g O2
  • b) 3.92 g O2
  • c) 1.96 g O2
  • d) 0.870 g O2
  • e) 588 g O2

Question 44

Question
If 4.0 moles of Li and 2.0 moles of O2 are used in the reaction 4Li + O2 --> 2Li2O, then the limiting reactant is ________________ and the theoretical yield of Li2O is ___________________ mol.
Answer
  • a) O2, 4.0 mol Li2O
  • b) O2, 2.0 mol Li2O
  • c) Li, 2.0 mol Li2O
  • d) Li, 4.0 mol Li2O
  • e) neither reactant is limiting

Question 45

Question
If you dissolve 0.75 moles of ammonium nitrate in 0.50 liters of solution, what is the total concentration, in moles/liter, of all the ions present in the solution?
Answer
  • a) 0.375 M ions
  • b) 0.188 M ions
  • c) 0.75 M ions
  • d) 1.5 M ions
  • e) 3.0 M ions

Question 46

Question
Nitrate salts are soluble, as are salts that contain a group 1A (alkali metal) ion. Silver carbonate is an insoluble salt. What is/are the spectator ion(s) for the reaction that occurs when solutions of silver nitrate and sodium carbonate are mixed? from the list below.
Answer
  • a) Ag+ and NO3-
  • b) Na+ and NO3-
  • c) only Na+
  • d) Only NO3-
  • e) Na+ and C(O3)2-

Question 47

Question
Consider the following compounds, all of which are soluble in water: Which of these compounds would you expect to behave as a nonelectrolyte(s) in solution?
Image:
e8709a3e-940f-41b3-ab93-4d3b82dbf985.gif (image/gif)
Answer
  • a) II, IV, and V only
  • b) II and V only
  • c) I and III only
  • d) I, III and IV only
  • e) II only

Question 48

Question
What mass of potassium chloride is needed to prepare 0.750 liters of a 0.250M KCl solution?
Answer
  • a) 224 g
  • b) 398 g
  • c) 14.0 g
  • d) 0.0715 g
  • e) 18.6 g

Question 49

Question
Which class of reaction is the following reaction best described by? Ni(s) + 2HClO4(aq) --> H2(g) + Ni(ClO4)2 (aq)
Answer
  • a) precipitation
  • b) oxidation/reduction
  • c) neutralization of acid and/or base
  • d) gas generation
  • e) both b and d are correct

Question 50

Question
Dilute solutions of acids are commonly prepared by diluting the concentrated commercial stock solutions of HCl found in chemistry laboratories. The concentration of stock HCl is 12 M. What volume of 12 M HCl should be diluted to 0.50 L with water in order to have a 0.25 M solution of HCl?
Answer
  • a) 1.7 x 10^2 mL
  • b) 42 mL
  • c) 10. mL
  • d) 21 mL
  • e) 24 mL
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