Organic Chemistry Laboratory Quiz

Organic Chemistry Laboratory Quiz

12th Grade

13 Qs

quiz-placeholder

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Organic Chemistry Laboratory Quiz

Organic Chemistry Laboratory Quiz

Assessment

Quiz

others

12th Grade

Hard

Created by

Abdissa Gebisa

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13 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Why is suction filtration (vacuum) preferred to gravity filtration in recrystallization?

It reduces the risk of contamination

It allows for better separation of impurities

It is faster and more efficient

It prevents loss of product due to evaporation

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Explain the behavior of a small amount of benzoic acid remaining unmelted even at temperatures above 200oC during a melting point test.

The benzoic acid has a high molecular weight

The benzoic acid is a mixture of different compounds

The benzoic acid has a polymorphic structure

The impurities in the benzoic acid affect its melting point

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What are the purposes of boiling stones and seed crystals in the recrystallization of solids?

Boiling stones help maintain a constant temperature, while seed crystals initiate crystallization

Boiling stones reduce impurities, while seed crystals improve yield

Boiling stones prevent splattering, while seed crystals provide structural support

Boiling stones increase solubility, while seed crystals enhance purity

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Why can boiling chips not be reused in laboratory experiments?

They lose their effectiveness after one use

They degrade when exposed to high temperatures

They become contaminated with impurities

They may contain residual solvents

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

If 5.0 g of compound 'Y' were to be recrystallized from 75 ml acetone, what will be the maximum amount of 'Y' that will be recrystallized?

4.0 g

3.5 g

3.0 g

4.5 g

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the purpose of determining melting points?

To calculate density

To identify unknown compounds

To separate mixtures

To measure volume

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Why could the rate of heating influence the melting point?

To increase pressure

To slow down the experiment

To speed up the experiment

To avoid decomposition

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