Free Printable Percent Error in Chemistry

1.

Which student had the MOST ACCURATE results?

a)

Ash

b)

Casey

c)

Blake

2.

In science, a percent error of _______ or less is considered accurate

a)

10%

b)

100%

c)

5%

d)

50%

3.

What is the formula for calculating percent error in chemistry?

a)

$\frac{\text{Experimental Value} - \text{Theoretical Value}}{\text{Theoretical Value}} \times 100$

b)

$\frac{\text{Theoretical Value} - \text{Experimental Value}}{\text{Theoretical Value}} \times 100$

c)

$\frac{\text{Experimental Value} + \text{Theoretical Value}}{2} \times 100$

d)

$\frac{\text{Theoretical Value} + \text{Experimental Value}}{2} \times 100$

4.

If the experimental value is 50 and the theoretical value is 55, what is the percent error?

a)

9.09%

b)

10%

c)

5%

d)

11%

5.

Which of the following best describes percent error?

a)

A measure of how accurate a measurement is compared to the accepted value

b)

A measure of the precision of a measurement

c)

A measure of the reliability of a measurement

d)

A measure of the consistency of a measurement

6.

In an experiment, the theoretical yield of a reaction is 20 grams, but the actual yield is 18 grams. What is the percent error?

a)

10%

b)

5%

c)

15%

d)

20%

7.

Why is percent error important in scientific experiments?

a)

It helps to determine the accuracy of experimental results

b)

It helps to determine the precision of measurements

c)

It helps to determine the reliability of instruments

d)

It helps to determine the consistency of data

8.

A student measures the boiling point of water to be 102°C. If the accepted boiling point is 100°C, what is the percent error?

a)

2%

b)

1%

c)

3%

d)

4%

9.

Which of the following scenarios would result in a negative percent error?

a)

The experimental value is less than the theoretical value

b)

The experimental value is greater than the theoretical value

c)

The experimental value is equal to the theoretical value

d)

The experimental value is twice the theoretical value

10.

If a percent error is calculated to be 0%, what does this indicate about the experimental value?

a)

It is exactly equal to the theoretical value

b)

It is greater than the theoretical value

c)

It is less than the theoretical value

d)

It is not related to the theoretical value

11.

In a chemistry lab, a student finds the density of a liquid to be 0.8 g/mL, while the accepted density is 0.85 g/mL. What is the percent error?

a)

5.88%

b)

6%

c)

4.88%

d)

7%

12.

What does a high percent error indicate about an experiment?

a)

There may be significant errors in the experimental procedure

b)

The experiment was conducted with high precision

c)

The theoretical value is incorrect

d)

The experimental value is very close to the theoretical value

13.

If the percent error of an experiment is 5%, what can be inferred about the experimental value?

a)

It is slightly different from the theoretical value

b)

It is exactly the same as the theoretical value

c)

It is significantly different from the theoretical value

d)

It is not related to the theoretical value

14.

A chemist measures the concentration of a solution to be 0.95 M, while the accepted concentration is 1.00 M. What is the percent error?

a)

5%

b)

4%

c)

6%

d)

3%

15.

In which of the following cases would you expect a percent error of zero?

a)

When the experimental value matches the theoretical value exactly

b)

When the experimental value is greater than the theoretical value

c)

When the experimental value is less than the theoretical value

d)

When the experimental value is unrelated to the theoretical value

Percent Error in Chemistry

Total questions: 15

Worksheet time: 15mins

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