Question 1

Which of the following best describes the concept of a meniscus as seen in laboratory glassware?

Accepted Answer

The curved surface of a liquid in a container, caused by surface tension and adhesion.

Question 2

When measuring the volume of a liquid in a graduated cylinder, where should you read the measurement?

Accepted Answer

At the bottom of the meniscus.

Question 3

Which electron configuration represents an atom with atomic number 7?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^3$$

Question 4

A student is asked to draw the electron configuration for oxygen. Which of the following is correct?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^4$$

Question 5

Which of the following best explains why the meniscus forms in a glass graduated cylinder?

Accepted Answer

Adhesion between the liquid and glass causes the liquid to climb the walls, while cohesion pulls the liquid down, forming a curve.

Question 6

If a graduated cylinder shows a meniscus at 47.6 mL, what is the correct way to record the volume?

Accepted Answer

47.6 mL

Question 7

Which principle is illustrated by the arrangement of electrons in the boxes shown in the orbital diagrams?

Accepted Answer

Hund's Rule

Question 8

A student fills a graduated cylinder with water and observes the meniscus. What property of water is primarily responsible for the meniscus being concave?

Accepted Answer

Adhesion to the glass is stronger than cohesion between water molecules.

Question 9

Which of the following is the correct electron configuration for carbon?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^2$$

Question 10

Which of the following statements about electron orbitals is correct?

Accepted Answer

Each orbital can hold a maximum of two electrons with opposite spins.

Question 11

A student incorrectly reads the volume of a liquid in a graduated cylinder from above the meniscus. What is the likely result?

Accepted Answer

The recorded volume will be higher than the actual volume.

Question 12

Which of the following electron configurations is NOT possible for a neutral atom?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^7$$

Question 13

Which rule states that electrons fill orbitals singly before pairing up?

Accepted Answer

Hund's Rule

Question 14

If an atom has the electron configuration $$1s^2$$\ $$2s^2$$\ $$2p^5$$, what is its atomic number?

Accepted Answer

9

Question 15

Which of the following best describes the Pauli Exclusion Principle?

Accepted Answer

No two electrons in the same atom can have the same set of four quantum numbers.

Question 16

A graduated cylinder contains a liquid with a meniscus at 66.8 mL. If a student adds 10.0 mL of another liquid, what should the new reading be?

Accepted Answer

76.8 mL

Question 17

Which of the following is the correct electron configuration for neon?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$

Question 18

Which of the following is a consequence of reading the meniscus incorrectly in a medical laboratory setting?

Accepted Answer

Incorrect dosage of medication may be administered.

Question 19

Which of the following orbital diagrams correctly represents the electron configuration for nitrogen?

Accepted Answer

Three unpaired electrons in the $$2p$$ orbitals.

Question 20

A student is asked to explain why the meniscus is important in volumetric measurements. Which explanation is correct?

Accepted Answer

It ensures accurate measurement by accounting for the liquid's surface curvature.

Selected Concepts in Introduction to Chemistry: Measurement and Atomic Structure

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