CHEM 1360 EXAM 3
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- what is not a property of acids?
- feels slippery on the skin
- what is not a property of a base?
- react with salts to form acids
- in general, when water solutions of an acid and base are mixed...
- a salt and water are formed
- a common substance that contains lactic acid is...
- yogurt
- lemons taste sour due to?
- citric acid
- CH3COOH
- vinegar
- H3BO3
- mild antiseptic
- HCl
- stomach acid
- H2SO4
- battery acid
- NaOH
- drain cleaner
- when dissolved in water, an acid usually forms?
- H+ ions and anions
- arrhenius acid
- produces H+ in water
- arrhenius base
- produces OH- in water
- bronsted acid
- H+ ion donor
- bronsted base
- H+ ion acceptor
- selenic acid, H2SeO4, is an extremely corrosive acid that when heated is capable of dissolving gold. it is very soluble in water. the anhydride of selenic acid is?
- SeO3
- zinc hydroxide, Zn(OH)2, is used as an absorbent in surgical dressings. the anhydride of zinc hydroxide is?
- ZnO
- Ca(OH)2
- strong base
- HCN
- weak acid
- HF
- weak acid
- HNO3
- strong acid
- H3PO4
- weak acid
- KOH
- strong base
- NH3
- weak base
- acetic acid reacts with water to form?
- CH3COO- + H3O+
- ammonia reacts with water to form?
- NH4+ + OH-
- when acids and bases are mixed?
- they neutralize each other
- what amount in moles of hydrochloric acid is needed to neutralize 1.5 mol of sodium hydroxide?
- 1.5 mol
- what amount in moles of hydrochloric acid is needed to neutralize 2.4 mol of calcium hydroxide?
- 4.8 mol
- what amount in moles of sodium hydroxide is needed to neutralize 1.5 mol of phosphoric acid?
- 4.5 mol
- the hydrogen ion concentration, [H+], of a 0.0010 M HNO3 solution is?
- 1.0 X 10^-3 M
- what is the pH of a solution that has a hydrogen ion concentration of 1.0 X 10^-11 M?
- 11
- pool water with a pH of 8 has a hydrogen ion concentration of?
- 1.0 X 10^-8 M
- the pH of pure water is?
- 7
- which of the following is a reasonable pH for 0.15 M HCl?
- 0.82
- which of the following is a reasonable pH for 0.15 M NaOH?
- 13.18
- physiological pH (7.4) is the average pH of blood. what is a reasonable hydrogen ion concentration of solution at physiological pH?
- 4 X 10^-8
- what is a conjugate acid-base pair?
- HCN and CN-
- what is not paired with its bronsted-lowry conjugate base or conjugate acid?
- NH3/H3O+
- a buffer solution is made from formic acid (HCOOH) and sodium formate (HCOONa). added acid will react with?
- HCOO-
- what can be combined to make a buffer?
- C6H5COOH and C6H5COONa
- what is a precursor to acid rain?
- sulfur dioxide
- what is a possible pH of acid rain?
- 4.2
- what is a common antacid ingredient?
- CaCO3
- when a person with excess stomach acid takes an antacid, the pH of the person's stomach changes?
- from a low value to a value nearer 7
- the leading chemical product of U.S. industry is?
- sulfuric acid
- the acid used in the automobile storage battery is?
- sulfuric acid
- the base often used in soap making is?
- NaOH
- what is not an example of how we view oxidation?
- electrons gained
- what (partial) equation represents an oxidation of nitrogen?
- NO2 -> N2O5
- when MnO4- reacts to form Mn^2+, the manganese in MnO4- is?
- reduced; it loses oxygen
- what partial equation represents a reduction of molybdenum?
- MoO2 + 4 H2 -> Mo + 2 H2O
- in the reaction, 3 Cl2 + 2 Al -> 2 AlCl3, the Cl2 is?
- reduced only
- in the equation, Mg -> Mg^2+ + 2e-, the magnesium?
- loses electrons and is oxidized
- when an element is oxidized, its oxidation number?
- increases as electrons are lost
- a reducing agent?
- loses electrons
- which substances is the oxidizing agent in the following reaction? Cu(s) + 2 Ag+(aq)-> Cu^2+(aq) + 2Ag(s)
- Ag+
- in the following reaction, the reducing agent is? Al(s) + Cr^3+(aq) -> Al^3+(aq) + Cr(s)
- Al(s)
- what is the oxidizing agent in the following reaction? Zn(s) + 2Tl+(aq) -> Zn^2+(aq) + 2Tl(s)
- Tl+(aq)
- what is the reducing agent in the following equation? 12H+(aq) + 2IO3-(aq) + 10Fe^2+(aq) -> 10 Fe^3+(aq) + I2(s) + 6 H2O(l)
- Fe^2+(aq)
- in the electrochemical cell with the reaction described by the following equation, the negative electrode is? Zn(s) + Cu^2+(aq) -> Zn^2+(aq) + Cu(s)
- Zn(s)
- in a dry cell, the anode is ____ and the cathode is ____?
- Zn, C
- in an electrochemical cell composed of two half-cells, ions flow from one half-cell to another by means of?
- a porous partition
- for the following reaction, the oxidation half-equation is: Mg + CuO -> MgO + Cu
- Mg -> Mg^2+ + 2 e-
- in the lead storage battery, the product of both the cathode and anode reactions is?
- PbSO4
- the fluid in the chamber of a lead-acid battery is?
- sulfuric acid
-
the overall electricity-producing reaction in the H2/O2 feul cell is?
2 H2(g) + O2(g) -> 2 H2O(g)
the reaction at the cathode is? - O2(g) + 4 H+ + 4 e- -> 2 H2O
- what type of reaction is the corrosion of iron?
- reduction-oxidation
- corrosion of aluminum is not as big a problem as corrosion of iron because aluminum?
- forms an oxide layer that is firmly stuck to the surface
- silver tarnish is mainly?
- Ag2S
- in a typical explosive reaction, which of the following usually occurs?
- liquids or solids are converted to gases
- black powder is a mixture of charcoal (carbon), potassium nitrate, and sulfur. the oxidizing agent in black powder is?
- potassium nitrate
- when CH4 is burned in plentiful air, the products are?
- CO2 + H2O
- when sulfur burns in plentiful air, the product is?
- SO2
- what is a common oxidizing agent?
- H2O2
- what else is a common oxidizing agent?
- Cl2
- the main active ingredient in common household bleach, often called "chlorine bleach" is?
- NaOCl
- bleach for hair usually contains?
- hydrogen peroxide
- many disinfectants are?
- oxidizing agents
- what is a common reducing agent?
- H2
- what else is a common reducing agent?
- C
- all the following metals are acceptable catalysts for reactions involving hydrogen gas except?
- aluminum
- a catalyst changes the rate of a chemical reaction by?
- lowering the activation energy?
- by number of atoms, what is the rank of hydrogen in abundance in the accessible portion of Earth?
- third
- hydrogen gas can be produced by reacting an active metal such as zinc with?
- an acid
- although helium is twice as dense as hydrogen gas, modern blimps are filled with helium rather than hydrogen gas because hydrogen is?
- highly flammable
- the main process by which animals obtain energy from food is?
- oxidation of glucose
- the only natural process that produces O2 is?
- photosynthesis