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CHEM 1360: TEST 4
Which of the following is not a property of acids?
A. Feel slippery on the skin
B. React with Zn to form hydrogen gas
C. Taste sour
D. Turn litmus red
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Feel slippery on the skin
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Which of the following is not a property of bases?
A. Feel slippery on the skin
B. React with salts to form acids
C. Taste bitter
D. Turn litmus blue
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React with salts to form acids
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In general when an acid and base are mixed _____
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A salt and water are formed
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A common substance that contains lactic acid is?
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Yogurt
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The sour taste of grapefruit is due to ____?
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Citric acid
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1. Ch3COOH A. Battery Acid
2. H3BO3 B. Soap Making
3. HCL C. Antiseptic eyewash
4. H2SO4 D. Remove boiler scale
5. NaOH E. Vinegar
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Ch3COOH = Vinegar
H3BO3 = Antiseptic eyewash
HCL = Remove boiler scale
H2SO4 = Battery acid
NaOH = Soap making
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What equation best represents what happens when hydrogen bromide dissolves in water?
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HBr(g) + H20 --> Br- (aq) + H3O+ (aq)
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1. Arrhenius acid
2. Arrhenius base
3. Bronsted acid
4. Bronsted base
A. Proton acceptor
B. Proton donor
C. Produces H+ in water
D. Produces OH- in water
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Arrhenius acid = Produces H+ in water
Arrhenius base = produces OH- in water
Bronsted acid = proton donor
Bronsted base = proton acceptor
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The anhydride of selenic acid H2SeO4 is ____
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SeO3 |
The anhydride of zinc hydroxide Zn(OH)2 is ___
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ZnO
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Classify the following as a either a strong acid, strong base, weak acid, or a weak base: Ca(OH)2, HCN, HF, HNO3, H3PO4, KOH, NH3.
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CaOh2 = Strong Base
HCN = Weak acid
HF = Weak acid
HNO3 = Strong acid
H3PO4 = weak acid
KOH = Strong base
NH3 = Weak base
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Acetic acid reacts with water to form ____
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Ch3COO- + H3O-
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Ammonia reacts with water to form ____
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NH4+ + OH-
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When equal amounts of acids and bases are mixed _____
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they neutralize each other
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What amount of moles in hydrochloric (HCL) acid is needed to neutralize 1.5 mol of sodium?
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1.5 mol
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What amount of moles in HCL hydrochloric acid is needed to neutralize 2.4 mol of calcium hydroxide?
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4.8 mol
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What amount of moles in sodium hydroxide is needed to neutralize 1.5 mol of phosphoric acid?
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4.5 mol
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The hydrogen ion concentration H+ of a .00100 M HNO3 solution is?
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1.0 X 10-3 M
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What is the pH of a solution that has a hydrogen ion concentration of 1.0 X 10-11 M?
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11
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Swimming pool water with a pH of 8 has a hydrogen ion concentration of?
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1.0 X 10-8 M
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The pH of pure water is ___
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7
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What is a reasonable pH for .15M HCl?
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82 |
What is a reasonable pH for .15 M NaOH?
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13.18
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Avg physiological pH of blood is 7.4; Which of the following is a reasonable hydrogen ion concentration of a solution at physiological pH?
A. -7.4 M
B .6 M
C. 6 X 10-7 M
D. 1 X 10-8 M
E. 4 X 10-8
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Avg physiological pH of blood is 7.4; Which of the following is a reasonable hydrogen ion concentration of a solution at physiological pH?
A. -7.4 M
B .6 M
C. 6 X 10-7 M
D. 1 X 10-8 M
E. 4 X 10-8
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Which of the following pairs is a conjugate acid-base pair?
CH3COOH and OH-
HCN and CN-
HCN and OH-
HCl and OH-
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HCN and CN-
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What is not a conjugate acid base pair?
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NH3 and H3O+
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A buffer solution is made from formic acid (HCOOH) and sodium formate (HCOONa). Added acid will react with ______
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HCOO-
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What pair of elements form a buffer?
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C6H5COOH and C6H5COONa
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Which of the following is a common ingredient in antacids; CaCo3
Ca(OH)2
HCl
KOH
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Which of the following is a common ingredient in antacids; CaCo3
Ca(OH)2
HCl
KOH
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When a person with excess stomach acid takes an antacid, the pH of the person's stomach changes from what to what?
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From a low value to a value nearer 7
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The leading chemical product of U.S industry is?
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Sulfuric acid
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The acid used in car batteries is?
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Sulfuric acid
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The base often used in making soap is?
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NaOH
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Which of the following is not one of the ways we can view oxidation?
A. Electrons gained
B. Electrons Lost
C. Hydrogen atoms lost
D. Oxygen atoms gained
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Electrons gained
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What partial equation represents an oxidation of nitrogen?
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NO2 >>> N2O5
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When CrO4- reacts to form Cr3+, the chromium is CrO4- is?
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Reduced; it loses oxygen
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Which partial equation best represents a reduction of molybdenum?
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MoO2 + 4 H2 >>> Mo4+ + 2 H2O
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According to the partial equation 3Cl2 + 2 Al >>> 2 AlCl3 : Cl2 Represents what?
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Reduced only
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According to the following partial equation, Manganese; Mn >>> Mn2+ + 2 e- _____
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Loses electrons and is oxidized
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When an element is oxidized, its oxidation number?
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Increases as electrons are lost
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A reducing agent _____
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Loses electrons
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Which substance is the oxidizing agent in Cu(s) + 2 Ag+(aq) >>> Cu2+ (aq) + 2Ag(s)?
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Ag+
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In the equation Al(s) + Cr3+(aq) >> Al3+(aq) + Cr(s)?
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Al(s)
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What is the oxidizing agent in the following reaction;
Zn(s) + 2Ti+ (aq) >> Zn2 (aq) + 2 Ti(s)?
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Ti+(aq)
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What is a common reducing agent?
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Fe2+(aq)
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|
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O2(g) + 4H+ + 2 e _
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|
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Sulfuric acid
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|
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PbSO4
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In Zn(s) + Cu2+ (aq) >>> Zn2+ (aq) + Cu(s) ; the negative electrode is?
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Zn(s)
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In one kind of electrochemical cell, the anode is _____ and the cathode is _____ZN
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Zn, C
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In an electrochemical cell composed of two half-cells, ions flow from one half-cell to another through?
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A porous particition
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The oxidation half-reaction of
Mg + CuO >>>MgO + Cu is?
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Mg >>>Mg2+ + 2 e_
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What type of reaction is the corrosion of iron?
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Oxidation-reduction
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Corrosion of aluminum is not as big a problem as corrosion of iron because aluminum _____
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Forms an oxide layer that adheres to the metal's surface.
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Silver tarnish is mainly
A. AgCl
B. Ag2O
C. Ag2S
D. Fe2O3
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Ag2S
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In an explosive reaction, which usually occurs?
A. Gases are converted from one form to another
B. Liquids or solids are converted to aqueous solutions
C. Liquids or solids are converted to gases
D. Nitrogen nuclei are split
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Liquids or solids are converted to gases
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The oxidizing agent in black powder is?
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Potassium nitrate
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When Ch4 is burned in plentiful air, the products are?
A. C + H2
B. Ch2 + H2O
C. CO2 + H2
D. CO2 + H2O
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CO2 + H2O
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When sulfur burns in plentiful air, the product is?
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SO2
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Which of the following is a common oxidizing agent?
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H2O2
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The main active ingredient in common household bleach or chlorine bleach is _______
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NaOCl
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Bleach for hair usually contains _____
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Hydrogen peroxide
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Many disinfectants are ____
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Oxidizing agents
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Which of the following is a common reducing agent?
A. Cl2
B F2
C. H2
D. I2
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H2
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Which of the following is a common reducing agent?
A. C
B. Cl2
C. F2
D. I2
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C
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All of the following metals used as catalysts for reactions involving hydrogen gas except?
A. Aluminum
B. Nickel
C. Palladium
D. Platinum
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Aluminum |
A catalyst changes the rate of a chemical reaction by ____
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lowering the activation energy
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By number of atoms, what is the rank of hydrogen in abundance in the accessible portion of earth?
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Third
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Hydrogen gas can be produced by reacting an active metal such as zinc with ______
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An acid
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Modern blimps are filled with helium because hydrogen is _____
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Highly flammable
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The main process by which animals obtain energy from food is ____
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Cellular respiration
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The only natural process that produces O2 is?
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Photosynthesis.
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