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Subject Test Chemistry

Question 3 of 17

Each of the questions or incomplete statements below is followed by five suggested answers or completions. Select the one that is best in each case.

$text ... Cu end text to the power of 2 plus end exponent left parenthesis a q right parenthesis plus text end text... invisible times text I end text to the power of minus left parenthesis a q right parenthesis rightwards arrow text end text... invisible times text CuI end text left parenthesis s right parenthesis plus... invisible times text I end text subscript 2 left parenthesis s right parenthesis$

When the equation above is balanced and all coefficients are reduced to lowest whole-number terms, the coefficient for $I^{-} (a q)$ is

Select an Answer

$1$

Correct Answer:

No

$2$

Correct Answer:

No

$3$

Correct Answer:

No

$4$

Correct Answer:

Yes

$5$

Correct Answer:

No

View Correct Answer

This question pertains to the balancing of chemical equations. To answer this question correctly, you need to recognize that both mass and charge must be conserved in any chemical equation. With this in mind, the chemical equation is correctly written as

$2 Cu^{2 +} (a q) + 4 I^{-} (a q) \to 2 CuI (s) + I_{2} (s)$

The coefficient for $I^{-} (a q)$ is $4$ .

Question Difficulty:

easy

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Subject Test Chemistry

Question 3 of 17

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