Chapter 5 Multiple choice questions

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. Simplify (without using a calculator) the following fraction by cancelling: $\frac{32}{480}$.

$\frac{1}{448}$ correct incorrect

$\frac{4}{120}$ correct incorrect

15 correct incorrect

$\frac{1}{15}$ correct incorrect

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. Without using a calculator, convert the fraction $\frac{8}{15}$ to 3 decimal places.

1.875 correct incorrect

0.533 correct incorrect

5.333 correct incorrect

0.413 correct incorrect

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. Without using a calculator, determine the value of the following expression: $\frac{7}{9}\times \frac{3}{42}$. (Give the answer as a single fraction and simplify as much as possible.)

$\frac{1}{18}$ correct incorrect

$\frac{2}{9}$ correct incorrect

$\frac{107}{17}$ correct incorrect

$\frac{10}{51}$ correct incorrect

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. Without using a calculator, determine the value of the following expression: $\frac{36}{4}\times \frac{15}{54}\times \frac{14}{18}$. (Give the answer as a single fraction and simplify as much as possible.)

$\frac{65}{76}$ correct incorrect

$\frac{35}{18}$ correct incorrect

$\frac{756}{388}$ correct incorrect

$\frac{35}{3}$ correct incorrect

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. Without using a calculator, determine the value of $\frac{3}{4}+\frac{4}{18}$. (Give the answer as a single fraction and simplify as much as possible.)

$\frac{7}{22}$ correct incorrect

$\frac{1}{6}$ correct incorrect

$\frac{7}{6}$ correct incorrect

$\frac{35}{36}$ correct incorrect

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. Without using a calculator, determine the value of $\frac{7}{9}+\frac{4}{5}+\frac{2}{3}$. (Give the answer as a single fraction and simplify as much as possible.)

$\frac{13}{17}$ correct incorrect

$\frac{101}{45}$ correct incorrect

$\frac{56}{135}$ correct incorrect

$\frac{742}{953}$ correct incorrect

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. Without using a calculator, determine the value of $\frac{7}{24}-\frac{3}{4}$. (Give the answer as a single fraction and simplify as much as possible.)

$\frac{4}{20}$ correct incorrect

$\frac{7}{32}$ correct incorrect

$\frac{-11}{24}$ correct incorrect

$\frac{-11}{6}$ correct incorrect

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. Without using a calculator, determine the value of the following expression: $\frac{25}{64}÷\frac{15}{8}$. (Give the answer as a single fraction and simplify as much as possible.)

$\frac{375}{512}$ correct incorrect

$\frac{5}{24}$ correct incorrect

$\frac{3}{8}$ correct incorrect

$\frac{10}{64}$ correct incorrect

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. Determine the value of the following expression: $\frac{36p{r}^2}{9q^2}÷\frac{4r^3}{3p{q}^2}$. (Give the answer as a single fraction and simplify as much as possible.)

$\frac{3p^2}{r}$ correct incorrect

$\frac{16r^5}{3q^5}$ correct incorrect

$\frac{10r^5}{3q^2}$ correct incorrect

$\frac{r}{3p^2}$ correct incorrect

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. The enthalpy of a reaction is measured as 300 kJ mol^-1 based on a series of experiments in an undergraduate chemistry lab. The literature value is 325 kJ mol^-1. What is the percentage error in the measured value?

0.08% correct incorrect

0.77% correct incorrect

92.31% correct incorrect

7.69% correct incorrect