Answers Chemistry PretestQuestion 6

6

lesson pretestMultiple Choice

Pretest

Question 6 • Chemistry

Which formula equation shows a reversible reaction?

Answer

A

CaCO sub 3 rightarrow CaO plus CO sub 2

B

NH sub 4 Cl s left right arrow NH sub 3 times g plus HCl times g

C

2 cap h sub 2 cap o sub 2 aq Pt set over right arrow 2 cap h sub 2 cap o l plus cap o sub 2 times g

D

2 Na plus cap f sub 2 rightarrow 2 NaF

Explanation

A reversible reaction is shown with a pair of arrows pointing in opposite directions (⇌), meaning the reaction can proceed both forward and backward. Choice A, NH₄Cl(s) ⇌ NH₃(g) + HCl(g), uses that symbol. The other choices show a one-way reaction arrow.

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