Reaction Types, Acids & Redox

30 questions · Answers revealed below each question · Print this set

1.Which common household alkali dissolves grease as oven cleaner?
- A. Sodium bicarbonate
- B. Citric acid
- C. Sodium hydroxide
- D. Sodium chloride
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Sodium hydroxide
Did you know? Lye, sodium hydroxide, is the strong alkali in oven and drain cleaners.
2.What does an inhibitor do to a reaction?
- A. It heats it
- B. It balances it
- C. It slows or stops it
- D. It speeds it up
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It slows or stops it
Did you know? Inhibitors drag reaction rates down, as preservatives do to food spoilage.
3.What is the ratio of hydrogen to oxygen atoms in water, per its formula?
- A. Three to one
- B. One to two
- C. Two to one
- D. One to one
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Two to one
Did you know? H2O carries exactly two hydrogens for every oxygen.
4.What does a catalyst do to a reaction's speed?
- A. It slows it down
- B. It stops it
- C. It reverses it
- D. It speeds it up
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It speeds it up
Did you know? Catalysts speed reactions while emerging unchanged themselves.
5.Which gas relights a glowing splint?
- A. Hydrogen
- B. Oxygen
- C. Methane
- D. Carbon dioxide
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Oxygen
Did you know? A glowing splint bursts back into flame in oxygen.
6.Which acid and base combine to make common table salt?
- A. Acetic acid and lime
- B. Hydrochloric acid and sodium hydroxide
- C. Nitric acid and ammonia
- D. Sulfuric acid and potassium hydroxide
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Hydrochloric acid and sodium hydroxide
Did you know? Table salt is sodium chloride, the neutralization product of HCl and NaOH.
7.What name describes the speed of a chemical reaction?
- A. Reaction rate
- B. Equilibrium constant
- C. Free energy
- D. Molar mass
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Reaction rate
Did you know? Reaction rate measures product formed or reactant used per unit time.
8.What kind of reaction releases heat to its surroundings?
- A. Exothermic
- B. Reversible
- C. Isobaric
- D. Endothermic
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Exothermic
Did you know? Exothermic reactions warm their flask, burning fuels chief among them.
9.Which type of reaction burns a fuel in oxygen, releasing heat and light?
- A. Sublimation
- B. Combustion
- C. Neutralization
- D. Condensation
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Combustion
Did you know? Combustion pairs fuel with oxygen and sets energy free.
10.Which gas turns limewater cloudy?
- A. Oxygen
- B. Carbon dioxide
- C. Hydrogen
- D. Ammonia
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Carbon dioxide
Did you know? Carbon dioxide clouds limewater by forming insoluble calcium carbonate.
11.What is the term for a reaction that can run both forward and backward?
- A. Irreversible
- B. Spontaneous
- C. Reversible
- D. Catalytic
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Reversible
Did you know? Reversible reactions settle into equilibrium between the two directions.
12.What kind of reaction absorbs heat from its surroundings?
- A. Endothermic
- B. Exothermic
- C. Catalytic
- D. Redox
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Endothermic
Did you know? Endothermic reactions pull heat in, like dissolving some cold packs.
13.How many hydrogens appear in one molecule of ammonia, NH3?
- A. Two
- B. One
- C. Three
- D. Four
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Three
Did you know? NH3 is one nitrogen bonded to three hydrogens.
14.What is a reaction between an acid and a base called?
- A. Neutralization
- B. Fermentation
- C. Combustion
- D. Electrolysis
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Neutralization
Did you know? Acid plus base gives a neutralization reaction, usually water plus a salt.
15.What is the typical pH range of rain, slightly acidic from CO2?
- A. About 7.9
- B. About 9
- C. About 5.6
- D. About 3
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About 5.6
Did you know? Natural rain sits near pH 5.6, acidified by dissolved CO2.
16.Which unit of electric charge honors Faraday's electrolysis work?
- A. The ampere
- B. The volt
- C. The ohm
- D. The faraday
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The faraday
Did you know? One faraday is a mole of electrons.
17.Which fuel burns clean to only CO2 and water, tested in rocket engines?
- A. Methane
- B. Kerosene
- C. Hydrogen
- D. Propane
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Hydrogen
Did you know? Hydrogen burns to pure water vapor, no carbon at all.
18.What is the half-life of a radioactive substance?
- A. Time for half to decay
- B. Twice its decay time
- C. Half its mass in grams
- D. Half its shelf life
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Time for half to decay
Did you know? Half-life is the span in which half the atoms decay.
19.Which pH best fits milk?
- A. About 9, alkaline
- B. About 6.5, slightly acidic
- C. Exactly 7
- D. About 3, sour
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About 6.5, slightly acidic
Did you know? Fresh milk hovers just under neutral, near pH 6.5.
20.What is the minimum energy a collision needs for a reaction to occur?
- A. Bond energy
- B. Ionization energy
- C. Kinetic energy
- D. Activation energy
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Activation energy
Did you know? Activation energy is the hill reactants must climb before reacting.
21.Which metal coats steel cans in tin plating?
- A. Tin
- B. Zinc
- C. Nickel
- D. Chromium
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Tin
Did you know? Tin plating keeps food cans from rusting from within.
22.Which effect shows a light beam cutting through a colloid?
- A. Tyndall effect
- B. Compton effect
- C. Photoelectric effect
- D. Doppler effect
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Tyndall effect
Did you know? The Tyndall effect lights up colloidal paths, unlike true solutions.
23.Which pH indicator goes from clear to pink in alkali?
- A. Bromothymol blue
- B. Litmus
- C. Phenolphthalein
- D. Methyl orange
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Phenolphthalein
Did you know? Phenolphthalein blinks pink above pH 8.2.
24.Which process refines copper by electroplating from impure anodes?
- A. Leaching
- B. Smelting
- C. Flotation
- D. Electrorefining
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Electrorefining
Did you know? Electrorefining plates pure copper, dropping gold at the bottom.
25.Which radiation type is just a heavy helium nucleus?
- A. Beta
- B. Alpha
- C. Gamma
- D. X-ray
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Alpha
Did you know? Alpha particles are helium nuclei, stopped by paper.
26.Which antacid base neutralizes excess stomach acid?
- A. Ethanol
- B. Sodium chloride
- C. Magnesium or aluminum hydroxide
- D. Sulfuric acid
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Magnesium or aluminum hydroxide
Did you know? Antacid hydroxides mop up stomach acid into water and salts.
27.What state must reactant particles be in to react, per collision theory?
- A. Charged positive
- B. Perfectly still
- C. Dissolved in oil
- D. Colliding with enough energy
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Colliding with enough energy
Did you know? Collision theory: reaction needs contact plus sufficient energy.
28.What is a mixture with particles that never settle called?
- A. Suspension
- B. Compound
- C. Solution
- D. Colloid
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Colloid
Did you know? Colloids scatter light while their particles stay afloat, like fog and milk.
29.Which two pollutant gases make acid rain?
- A. Ozone and argon
- B. Ammonia and hydrogen
- C. Sulfur dioxide and nitrogen oxides
- D. Carbon dioxide and methane
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Sulfur dioxide and nitrogen oxides
Did you know? SO2 and NOx turn into sulfuric and nitric acids aloft.
30.Which process plates aluminum from its oxide with cryolite, invented 1886?
- A. The Downs process
- B. The Bayer process
- C. The Mond process
- D. The Hall-Héroult process
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The Hall-Héroult process
Did you know? Hall and Héroult cracked cheap aluminum in 1886.

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