Chapter 9 Test

Question

4 of 20 4 of 20 Items

Question
What are the coefficients that will balance the skeleton equation below?
__NaCl + __CaO -> __Na2O +__CaCl2
Responses

Reaction is Balanced
Reaction is Balanced

4, 2, 1, 2
4, 2, 1, 2

2, 1, 1, 1
2, 1, 1, 1

2, 2, 1, 1
2, 2, 1, 1

Answer 1

To balance the skeleton equation:

\[ __ \text{NaCl} + __ \text{CaO} \rightarrow __ \text{Na}_2\text{O} + __ \text{CaCl}_2 \]

we can assign coefficients to each compound:

1. Start with sodium (Na). There are 2 Na in \(\text{Na}_2\text{O}\), so we need 2 NaCl: \[ 2 \text{NaCl} \]

2. For calcium (Ca), there is 1 in \(\text{CaO}\) and 1 in \(\text{CaCl}_2\), so we need 1 \(\text{CaO}\): \[ 1 \text{CaO} \]

3. For chloride (Cl), there are 2 in \(\text{CaCl}_2\), and we already have 2 NaCl giving us 2 Cl.

4. For oxygen (O), there is 1 in \(\text{CaO}\) and 1 in \(\text{Na}_2\text{O}\), so we need 1 \(\text{Na}_2\text{O}\) to balance out: \[ 1 \text{Na}_2\text{O} \]

Now we can summarize the balanced equation: \[ 2 \text{NaCl} + 1 \text{CaO} \rightarrow 1 \text{Na}_2\text{O} + 1 \text{CaCl}_2 \]

Thus, the coefficients are: \[ 2, 1, 1, 1 \]

So the correct response is: 2, 1, 1, 1.