Question

21. Classify the following chemical reaction: 2Na₂O (s) <====> 4Na (l) + O₂ (g)

Choose all that apply.

a) synthesis reaction

b) decomposition reaction

c) combustion reaction

d) redox reaction

e) nonredox reaction

f) single-replacement reaction

Answer 1

Classify the following chemical reaction: 2Na₂O (s) <====> 4Na (l) + O₂ (g)

Choose all that apply.

a) synthesis reaction—--------correct answer.

4Na(S) + O2(G) → 2Na2O(S)

Synthesis reactions refer as put things together.

====================================================

b) decomposition reaction--------correct answer.

Decomposition reactions refer as "take things apart".

In this reaction , 2Na₂O (s) decomposed to 4Na (l) and O₂ (g)

====================================================

c) combustion reaction------- wrong answer

====================================================

d) redox reaction ------------ correct answer.

4Na(S) + O2(G) → 2Na2O(S)

Oxidation Reaction: Na → Na+ + e-.

Reduction Reaction: O2(g) + 4e-→ 2O2-2*Half Reactions.

Oxidizing Agent: one which is reduced like O2.

Reducing Agent: one which itself gets oxidized.

====================================================

e) nonredox reaction ----------wrong answer

there is Oxidation Reaction and Reduction Reaction

====================================================

f) single-replacement reaction---------- wrong answer

in the reaction , elements are substituted for another element in a compound

====================================================