chemistry, science
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Why is oxygen reduced in the reaction of hydrogen with oxygen to make water?
Oxygen pulls electrons toward itself.
Oxygen pushes electrons toward the hydrogens.
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)
salt hydrolysis
electrolysis
corrosion
The half-reaction method is particularly useful for balancing redox equations.
true
false
A spontaneous reaction causes current to flow in an electrolytic cell.
true
false
Which of the following chemical equations represents an oxidation-reduction reaction?
Mg(OH)2 + 2HCl → MgCl2 + 2H2O
BiCl2 + Na2SO4 → 2NaCl + BiSO4
CH4+2O2→CO2+2H2O
Identify the products formed in the net reaction of the electrolysis of water.
liquid hydrogen and oxygen gas
liquid oxygen and hydrogen gas
hydrogen gas and oxygen gas
The gas produced at the cathode in the electrolysis of brine is _________.
chlorine
oxygen
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-
true
false
In which of the following species is the oxidation number of sulfur less than 6?
SO3
NaSO4
SO2
A proton is transferred between a conjugate acid-base pair.
true
false
A Lewis base is a substance that can _________.
accept a pair of electrons
donate a pair of electrons
donate a hydrogen ion
Which combination of acid and salt in aqueous solution would form a buffer?
carbonic acid and sodium carbonate
hydrochloric acid and potassium chloride
sulfuric acid and calcium sulfate
Which type of solution is one with a pH of 7?
acidic
basic
neutral
The formula of the ammonium ion is written as _________.
a.
b. c.
H3O+ H+
NH4+
A highly active metal is most easily oxidized.
true
false
When an acid reacts with a base, what compounds are formed?
a salt and water
water only
a salt only
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