Chapter 4 Multiple choice questions

. Simplify the expression: C₂H₄ + NH + CO + CH₃ + OH.

3C + 4H + N + 2O

4C + 9H + N + 2O

C + H + N + O

4C + 7H + N + O

. Simplify the expression: 3k - 4m + 7n - 5k - 2n + 6k - 8m + 5.

4k - 12m + 10n

4k - 12m + 5n + 5

2kmn

3k - 4m + 7n + 5

. Rearrange the equation 3m + 5n + 3 = 10n + 2m, to obtain m on its own.

m = 15n + 3

m = 7n - 3

m = n - 3

m = 5n - 3

. Rearrange the equation 10p - 4q + 8r - 5 = 4q + 9r - 5p to obtain r on its own.

r = 15p - 5

r = 5p - 8q + 5

r = 15p - 8q - 5

r = 8q - 15p + 5

. Simplify the following expression as much as possible:

y = \frac{7 s}{35 s^{3}}

.

y = \frac{1}{5 s^{2}}

y = \frac{1}{5 s}

y = \frac{5 s^{2}}{s}

y = 5 s^{2}

. Simplify the following expression as much as possible:

x = \frac{48 p^{2} q^{4} r}{6 p q r}

.

x = 8 p q^{3}

x = 64

x = \frac{8 p^{2} q^{4} r}{p q r}

x = \frac{24 p q^{3} r}{3}

. Rearrange the following equation to make y the subject: 3x - 5z = 6 - 8y.

y = (3x - 5z) ÷ (6 - 8)

y = (3x - 5z - 6) ÷ 8

y = (6 - 3x + 5z) × 8

y = (6 - 3x + 5z) ÷ 8

. A chemist generates the following rate expression

y = \frac{5 k_{2}}{10 k_{2}^{2}}

.
Simplify it by cancelling.

y = \frac{2}{k_{2}^{}}

y = \frac{k_{2}}{2 k_{2}^{2}}

y = \frac{1}{2 k_{2}^{}}

y = \frac{5}{10 k_{2}^{}}

. Collect like terms to obtain the empirical formula of naphthalene: C + C + 2C + 3C + C + CH + CH + 2H + H + 2H + H.

C₁₀H₈

C₉H₉

C₈H₈

C₈H₁₀

. Simplify the following expression 2y⁴ = 6y³ and hence find a value of y.

y = ⅓

y = 3

2y = 6

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