Week 2 quiz

A chemist performs five trials to measure the boiling point of a liquid. The accepted boiling point is 78.5°C. The data collected is: 79.8°C, 79.7°C, 79.9°C, 79.8°C, 79.8°C. What can best be concluded about these measurements?

• The results are accurate but not precise

• The results are precise but not accurate

• The results are both accurate and precise

• The results are neither accurate nor precise

Two students are measuring the density of a liquid. Student A gets values of 1.02, 1.04, 1.03 g/mL, while Student B gets values of 0.89, 1.17, and 1.12 g/mL. The accepted value is 1.03 g/mL. Which statement is correct?

• Student A shows high accuracy and high precision

• Student A shows high precision but low accuracy

• Student B shows high precision but low accuracy

• Student B shows high accuracy but low precision

In an experiment, a group of students shoots arrows at a target. Most arrows land far from the center but are clustered together in one corner of the target. What does this indicate about the group’s performance?

• High accuracy, low precision

• Low accuracy, high precision

• High accuracy, high precision

• Low accuracy, low precision

An engineer is designing a tank to hold a precise amount of fuel. If they can only measure one variable with high accuracy, which is most critical to minimize error in the final fuel calculation?

• The density of the fuel

• The height of the tank

• The volume of the tank

• The surface area of the tank

A biology student is tasked with identifying an unknown metal cube by calculating its density. Which measurement is the most important to be both accurate and precise in order to identify the metal correctly?

• Mass of the cube

• Length of one side of the cube

• Volume of the cube

• Temperature of the room