Chemistry Test Review

What is the difference between observation and inference in scientific methods?

• Observation is subjective; inference is objective.

• Observation is based on perceptions; inference is based on senses.

• Observation is objective; inference is subjective.

• Observation is based on opinions; inference is based on facts.

What type of data is based on qualities rather than quantities?

• Quantitative data

• Qualitative data

• Numerical data

• Statistical data

Which of the following best describes accuracy in measurements?

• The degree to which measurements agree with one another

• The degree to which the experimental result agrees with the accepted value

• The consistency of multiple measurements

• The ability to repeat measurements

What does precision in measurements refer to?

• How close the measurement is to the truth

• How specific and consistent measurements are with each other

• The degree to which the result agrees with the accepted value

• The ability to measure without error

What is the formula for calculating percentage error?

• (experimental value + accepted value) / accepted value x 100

• (experimental value - accepted value) / accepted value x 100

• (accepted value - experimental value) / experimental value x 100

• (accepted value + experimental value) / experimental value x 100

If the experimental value is 2.10 g/mL and the accepted value is 2.17 g/mL, what is the percentage error?

• 3.23%

• 2.10%

• 2.17%

• 4.00%

How do you calculate the average of a set of values?

• Multiply the values together

• Subtract the smallest value from the largest

• Sum of the values divided by the number of values

• Add the values and multiply by the number of values

What is the SI unit for measuring length?

• kilogram

• meter

• second

• mole

What is the scientific notation for 1 mole of something?

• 6.02 x 10^20

• 6.02 x 10^21

• 6.02 x 10^22

• 6.02 x 10^23

What is the unit of temperature in the metric system?

• Kelvin (K)

• Celsius (°C)

• Fahrenheit (°F)

• Rankine (°R)