Chapter 5 Multiple-choice questions

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. The molar mass of carbon is 12 g mol^-1. How many moles are there in 3g of carbon?

0.25 mol correct incorrect

0.4 mol correct incorrect

4 mol correct incorrect

36 mol correct incorrect

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. The concentration of a solution is expressed as the number of moles in which of the following volumes?

1 μL correct incorrect

1 mL correct incorrect

1 L correct incorrect

1 dL correct incorrect

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. 25 mL is equivalent to how many litres (L)?

0.025 correct incorrect

0.25 correct incorrect

2.5 correct incorrect

0.0025 correct incorrect

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. How many moles of HCl are there in 10 mL of a solution with a concentration of 0.5 mol L^-1?

5 mol correct incorrect

0.5 mol correct incorrect

0.05 mol correct incorrect

1 mol correct incorrect

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. What is the concentration of a 500 mL solution containing 0.3 mol of glucose?

0.15 mol L^-1 correct incorrect

0.0006 mol L^-1 correct incorrect

1.67 mol L^-1 correct incorrect

0.6 mol L^-1 correct incorrect

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. What mass of glucose would you need (in g) to have 0.8 mol, given that the molar mass of glucose is 180 g mol^-1?

144 g correct incorrect

0.0044 g correct incorrect

225 g correct incorrect

1.44 g correct incorrect

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. The wavelength of electromagnetic radiation is represented by which of the following symbols?

ε correct incorrect

γ correct incorrect

Δ correct incorrect

λ correct incorrect

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. The distance travelled by light as it passes through a cuvette is called which of the following?

The focal length correct incorrect

The sample width correct incorrect

The path length correct incorrect

The field length correct incorrect

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. The absorbance of a sample as measured by UV-visible spectrometry is inversely proportional to the concentration of the sample, such that, as the concentration increases, the absorbance decreases. True or false?

True correct incorrect

False correct incorrect

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. How much water must we add to a 10 mL sample of HCl with a concentration of 0.5 mol L^-1 to bring about a ten-fold dilution?

10 mL correct incorrect

100 mL correct incorrect

90 mL correct incorrect

990 mL correct incorrect

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. The molar mass of an element is equal to which of the following?

Avogadro's number correct incorrect

Atomic number correct incorrect

Mass number correct incorrect

Relative atomic mass correct incorrect

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. If we begin with 8 mL of a glucose solution with a concentration of 0.25 mol L^-1 and dilute it to a volume of 0.5 L, what is the concentration of the final, diluted solution?

250 mol L^-1 correct incorrect

4 mol L^-1 correct incorrect

0.004 mol L^-1 correct incorrect

0.0025 mol L^-1 correct incorrect

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. What mass of agar would we need in order to produce 500 mL of a 2.5% w/v solution?

1250 g correct incorrect

1.25 g correct incorrect

12.5 g correct incorrect

0.0125 g correct incorrect

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. When carrying out a 10-fold serial dilution, starting with a solution of concentration 5 mol L^-1, what would be the concentration of the solution after the third dilution step?

0.5 mol L^-1 correct incorrect

0.005 mol L^-1 correct incorrect

0.004 mol L^-1 correct incorrect

0.04 mol L^-1 correct incorrect

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. A titration reaction yields a colour change when 10.2 mL of a 0.5 M solution of nitric acid, HNO₃, is added to 20 mL of potassium hydroxide, KOH. What is the concentration of the potassium hydroxide solution? HNO₃ and KOH react as follows:
HNO₃ + KOH → KNO₃ + H₂O

0.0051 mol L^-1 correct incorrect

255 mol L^-1 correct incorrect

0.000225 mol L^-1 correct incorrect

0.225 mol L^-1 correct incorrect