did an oxidation-reduction reaction occur in the reaction between copper sulfate and sodium sulfide?
cuso₄ + na₂s → cus + na₂so₄
a. this is a redox reaction because copper gained electrons.
b. this is a redox reaction because sodium lost electrons.
c. this is a redox reaction because sulfur gained electrons.
d. this is not a redox reaction because no electrons were transferred.
e. this is not a redox reaction because oxygen did not gain electrons.

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# Brief Explanations:
To determine if a redox reaction occurred, we check the oxidation states of each element.
- For $ \text{CuSO}_4 $: $ \text{Cu} $ is $ +2 $, $ \text{S} $ (in $ \text{SO}_4^{2-} $) is $ +6 $, $ \text{O} $ is $ -2 $.
- For $ \text{Na}_2\text{S} $: $ \text{Na} $ is $ +1 $, $ \text{S} $ is $ -2 $.
- For $ \text{CuS} $: $ \text{Cu} $ is $ +2 $, $ \text{S} $ is $ -2 $.
- For $ \text{Na}_2\text{SO}_4 $: $ \text{Na} $ is $ +1 $, $ \text{S} $ (in $ \text{SO}_4^{2-} $) is $ +6 $, $ \text{O} $ is $ -2 $.

No element changes its oxidation state (Cu: $ +2 \to +2 $, S: $ -2 $ (in $ \text{Na}_2\text{S} $) and $ +6 $ (in $ \text{SO}_4^{2-} $) remain, Na: $ +1 \to +1 $, O: $ -2 \to -2 $). Thus, no electrons are transferred, so it is not a redox reaction.

# Answer:
D. This is not a redox reaction because no electrons were transferred.

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