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 conversion factor to change feet to inches?

$$ \frac{12 \text{ inches}}{1 \text{ foot}} $$

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 mass of a sample five times and gets values that are very close to each other, but all are far from the accepted value. Which term best describes these measurements?

Accepted Answer

Precise but not accurate

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

In an experiment to test the effect of room temperature on how many hours people sleep, which is the independent variable?

Accepted Answer

The room temperature

Question 5

Which of the following is NOT a source of systematic error?

Accepted Answer

Natural fluctuations in measurement

Question 6

How many significant figures are in the measurement 0.0300 m?

Accepted Answer

3

Question 7

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

Accepted Answer

$$ 351.0 $$

Question 8

Which SI prefix corresponds to $$ 10$$^{-6}$$ $$?

Accepted Answer

micro-

Question 9

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

Accepted Answer

The uncertainty in the measurement

Question 10

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 11

Which of the following is the correct scientific notation for the number 0.000000574?

Accepted Answer

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

Question 12

A woman has been alive for 26.5 years. How many hours is this? (Use $$ 365 $$ days/year and $$ 24 $$ hours/day)

Accepted Answer

$$ 232,000 $$ hours

Question 13

Which of the following statements about the control group in an experiment is correct?

Accepted Answer

It is used as a reference to compare the experimental group.

Question 14

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

Accepted Answer

$$ \frac{12 	ext{ inches}}{1 	ext{ foot}} $$

Question 15

When multiplying $$ 23.478  by$$ $$ 2.056 $$, how many significant figures should the answer have?

Accepted Answer

4

Question 16

Which of the following is true about zeros in significant figures?

Accepted Answer

Trailing zeros in a decimal number are significant.

Question 17

Which of the following is the correct order of magnitude for the prefix 'kilo-'?

Accepted Answer

$$ 10^3$ $$

Question 18

Which of the following best describes a hypothesis in scientific inquiry?

Accepted Answer

A prediction or explanation that is testable and based on observations.

Question 19

Which of the following is NOT a base SI unit?

Accepted Answer

Gram

Foundations of Scientific Measurement and the Scientific Method in Chemistry

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