Q: Which of the following is the correct formula for percent error?

$$\frac{\text{Accepted} - \text{Measured}}{\text{Accepted}} \times 100$$

Question 1

Which of the following statements best describes the difference between an observation and an inference in the scientific method?

Accepted Answer

An observation is information gathered by the senses, while an inference is an assumption based on observations and prior knowledge.

Question 2

A student measures the length of a table as $$1.37 \pm 0.05 m. $$What does the $$\pm 0.05 m $$represent?

Accepted Answer

The uncertainty of the measurement

Question 3

Which of the following is the correct definition of a control group in an experiment?

Accepted Answer

The group that is used as a reference to compare to the experimental group and does not receive the experimental treatment.

Question 4

A scientist is testing the effect of temperature on the rate at which a chemical reaction occurs. Which is the independent variable?

Accepted Answer

The temperature at which the reaction is performed

Question 5

Which of the following best describes a hypothesis?

Accepted Answer

A prediction or explanation of a phenomenon that is testable and based on observations

Question 6

Which of the following numbers has 4 significant figures?

Accepted Answer

$$2.060$$

Question 7

When adding $$3.5670$$, $$100.34$$, and $$233.1$$, what is the correct answer with the proper number of significant digits?

Accepted Answer

$$337.0$$

Question 8

A measurement is recorded as $$4.8 	imes 10^2$ with two significant figures. Which of the following is a correct way to express this value with the same number of significant figures?

Accepted Answer

$$480$$

Question 9

Which of the following is the correct formula for percent error?

Accepted Answer

$$\frac{	ext{Accepted} - 	ext{Measured}}{	ext{Accepted}} 	imes 100$$

Question 10

A student measures the mass of an object five times and gets values that are very close to each other but far from the accepted value. Which of the following best describes the measurements?

Accepted Answer

Precise but not accurate

Question 11

Which of the following is the correct SI prefix and symbol for $$10^{-6}$$?

Accepted Answer

micro, \mu

Question 12

Convert $$128.5$$ feet to inches. (1 foot = 12 inches)

Accepted Answer

$$1,542$$ inches

Question 13

A woman has been alive for $$26.5$$ years. How many hours is this? (Assume 1 year = 365 days)

Accepted Answer

$$232,000$$ hours

Question 14

Which of the following best describes a systematic error?

Accepted Answer

An error caused by a poorly calibrated instrument or human error, affecting accuracy

Question 15

Which of the following is the correct formula for standard deviation of a set of $$N$$ measurements $$x_i$$ with mean $$\overline{x}$$?

Accepted Answer

$$\sigma = \sqrt{\frac{1}{N} \sum_{i=1}^{N} (x_i - \overline{x})^2$}$$

Question 16

Which of the following is NOT a base SI unit?

Accepted Answer

liter

Question 17

Which of the following best describes the purpose of scientific notation?

Accepted Answer

To represent very large and very small numbers using powers of ten and the correct number of significant digits

Question 18

In the number $$1,342,365.1427$$, which digit is in the hundredths place?

Accepted Answer

2

Question 19

Which of the following is the correct order of steps in the scientific method as described in the study materials?

Accepted Answer

Observation, Research, Hypothesis, Experiment, Conclusion, Report

Question 20

A student wants to convert $$0.00000574$$ meters to scientific notation. What is the correct answer?

Accepted Answer

$$5.74 	imes 10$$^{-6}$$ meters

Foundations of Scientific Measurement and the Scientific Method in Chemistry

Study Guide - Practice Questions

Study Guide - Flashcards