Question

A)
Use the chemical equation to answer the question.
2Na + Cl
→ ?NaCl
In the reaction, sodium and chlorine combine to produce sodium chloride. In an instance when eightsodium chloride molecules are produced, how many diatomic chlorine molecules went into the reaction?
(1 point)
2
eight
two
four
one
A)
Which of the following chemical equations supports the claim that mass is conserved during achemical reaction?
(1 point)
K
+
→
2
KCl
Cl
2
2
+
→
2
O
H
2
O
2
H
2
+
→
HCl
H
2
Cl
2
+
2
→
2
N
2
H
2
NH
3

Answer 1

1) four
Reason: 2 Na + Cl2 → 2 NaCl shows 1 Cl2 produces 2 NaCl, so 8 NaCl require 8/2 = 4 Cl2.

2) 2 K + Cl2 → 2 KCl
Reason: this equation is balanced (same number of each atom on both sides), which supports conservation of mass.