chemistry, science

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Why is oxygen reduced in the reaction of hydrogen with oxygen to make water?

  1. Oxygen pulls electrons toward itself.
  2. Oxygen pushes electrons toward the hydrogens.
  3. Oxygen absorbs a proton.

Which term describes the following process? 2Fe(s) + O2(g) + 2H2O(l) → 2Fe(OH)2(s)

4Fe(OH)2(s) + O2(g) +2H2O(l) → 4Fe(OH)3(s)

  1. salt hydrolysis
  2. electrolysis
  3. corrosion

The half-reaction method is particularly useful for balancing redox equations.

  1. true
  2. false

A spontaneous reaction causes current to flow in an electrolytic cell.

  1. true
  2. false

Which of the following chemical equations represents an oxidation-reduction reaction?

  1. Mg(OH)2 + 2HCl → MgCl2 + 2H2O
  2. BiCl2 + Na2SO4 → 2NaCl + BiSO4
  3. CH4+2O2→CO2+2H2O

Identify the products formed in the net reaction of the electrolysis of water.

  1. liquid hydrogen and oxygen gas
  2. liquid oxygen and hydrogen gas
  3. hydrogen gas and oxygen gas

The gas produced at the cathode in the electrolysis of brine is _________.

  1. chlorine
  2. oxygen
  3. hydrogen

____ 8.

____ 9.

____ 10.

____ 11.

____ 12.

____ 13.

____ 14.

____ 15.

____ 16.

H is oxidized and Cl is reduced in this reaction. 2ClO- +H2 +2e- →2Cl- +2OH-

  1. true
  2. false

In which of the following species is the oxidation number of sulfur less than 6?

  1. SO3
  2. NaSO4
  3. SO2

A proton is transferred between a conjugate acid-base pair.

  1. true
  2. false

A Lewis base is a substance that can _________.

  1. accept a pair of electrons
  2. donate a pair of electrons
  3. donate a hydrogen ion

Which combination of acid and salt in aqueous solution would form a buffer?

  1. carbonic acid and sodium carbonate
  2. hydrochloric acid and potassium chloride
  3. sulfuric acid and calcium sulfate

Which type of solution is one with a pH of 7?

  1. acidic
  2. basic
  3. neutral

The formula of the ammonium ion is written as _________.

a.

b. c.

H3O+ H+

NH4+

A highly active metal is most easily oxidized.

  1. true
  2. false

When an acid reacts with a base, what compounds are formed?

  1. a salt and water
  2. water only
  3. a salt only
 
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