Question 1

The images above show a liquid in a graduated cylinder and a diagram of the same liquid. What is the correct way to read the volume of the liquid in the cylinder?

Accepted Answer

Read the volume at the lowest point of the meniscus.

Question 2

Which property of water causes the curved surface (meniscus) observed in the first image?

Accepted Answer

Adhesion between water molecules and glass

Question 3

If the liquid in the cylinder is water and the meniscus is concave, what does this indicate about the interaction between the liquid and the container?

Accepted Answer

The adhesive forces between water and glass are stronger than the cohesive forces between water molecules.

Question 4

A student measures the volume of a liquid in a graduated cylinder and records the value at the top of the meniscus. What type of error has the student made?

Accepted Answer

Systematic error due to incorrect reading technique

Question 5

Why is it important to read the meniscus at eye level when measuring the volume of a liquid?

Accepted Answer

To avoid parallax error and obtain an accurate measurement

Question 6

If a student consistently reads the meniscus from above eye level, what will be the effect on the measured volume?

Accepted Answer

The measured volume will be too low.

Question 7

Which of the following best describes the meniscus formed by mercury in a glass container?

Accepted Answer

Convex due to strong cohesion between mercury atoms

Question 8

A student needs to measure 25.0 mL of water using a graduated cylinder. Which of the following steps should they follow for the most accurate measurement?

Accepted Answer

Read the bottom of the meniscus at eye level

Question 9

Which of the following statements about the meniscus is FALSE?

Accepted Answer

The meniscus is always concave for all liquids.

Question 10

In a laboratory experiment, a student observes a blue liquid forming a concave meniscus in a glass tube. What can be inferred about the liquid?

Accepted Answer

The liquid has stronger adhesive forces to glass than cohesive forces within itself.

Chemistry and Measurements: Unit Conversions, Density, and Concentration

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