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

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

Q: Which of the following is the correct scientific notation for $$0.000000574$$ meters?

$$5.74 \times 10$$^{-7}$$\text{ meters}$

Question 1

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

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 scientist measures the length of a table as $$1.37 \pm 0.05 cm. $$What does the $$\pm 0.05 cm $$represent?

Accepted Answer

The uncertainty in the measurement.

Question 3

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

Accepted Answer

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

Question 4

A student records the following measurements for the mass of a sample: 2.34 g, 2.35 g, 2.33 g, and 2.34 g. Which term best describes these measurements?

Accepted Answer

Precise but not necessarily accurate

Question 5

Which of the following is a correct statement about significant figures?

Accepted Answer

Zeros between non-zero digits are always significant.

Question 6

When adding $$3.5670$$, $$100.34$$, and $$247.1$$, what is the correct answer with the proper number of significant digits?

Accepted Answer

$$351.0$$

Question 7

Which of the following is the correct result for $$23.478 	imes 4.8$$ with the proper number of significant digits?

Accepted Answer

$$110$$

Question 8

A scientist wants to test the effect of room temperature on how many hours people sleep. Over a week, they set their thermostat to several varying temperatures and record the hours slept. Which is the independent variable?

Accepted Answer

The room temperature

Question 9

Which of the following prefixes represents $$10^{-3} in $$the SI system?

Accepted Answer

milli-

Question 10

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

Accepted Answer

$$1,542$$ inches

Question 11

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

Accepted Answer

$$232,000$$ hours

Question 12

Which of the following is the correct scientific notation for $$0.000000574$$ meters?

Accepted Answer

$$5.74 	imes 10$$^{-7}$$	ext{ meters}$

Question 13

Which of the following is the correct formula for standard deviation?

Accepted Answer

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

Question 14

Which of the following is a source of random error in a measurement?

Accepted Answer

Unavoidable, natural fluctuations in any measure

Question 15

Which of the following is NOT a base SI unit?

Accepted Answer

Liter

Question 16

Which of the following statements about the 'textbook' scientific method is correct?

Accepted Answer

The steps can be flexible and not always completed in order.

Question 17

In the context of scientific inquiry, which statement about a hypothesis is correct?

Accepted Answer

A hypothesis is a prediction or explanation that must be testable and falsifiable.

Question 18

Which of the following is the correct way to express the number $$1,342,365.1427 in $$scientific notation?

Accepted Answer

$$1.3423651427 	imes 10$$^{6}$$

Question 19

Which of the following is the correct conversion factor to change feet to inches?

Accepted Answer

$$1 	ext{ foot} = 12 	ext{ inches}$$

Foundations of Scientific Measurement and the Scientific Method in Chemistry

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