chem unit 3

Why is a liter considered a derived unit?

A liter is three-dimensional and a combination of length units

An example that is precise but not accurate if the accepted value is 18.4

12.2, 12.3, 12.1

How many liters are in a container that 34 cm by 45cm by 12 cm

18 liters

298 Kelvin is equal to ________ degrees celsius

25

45 degrees C is equal to ________ kelvins

318

What is the number value of a mole?

6.02x10^23

What is the difference between a derived unit and a base unit?

A derived unit is a combination of base units and is multi-dimensional

Compare the mole to another common unit that is used to measure the amount of a substance. Why are they similar?

A dozen because both are used to count the amount of a substance while representing an exact number.

What does Kelvin measure and what is it based on?

Kelvin measures temperature and it is based on absolute

Select the proper definition(s) of both accuracy and precision.

Precision is also the level of uncertainty in a number or measurement Accuracy is how close a measurement is to the accepted value Precision is how close the measurements are to each other

What is an "SI" unit of measurement?

The International System of Units is the modern form of the metric system. It is the only system of measurement with an official status in nearly every country in the world.

If you report 7.42 grams in your lab and the accepted value is 7.55 grams, what is the error and percent error of the lab results.

error = .13 g percent error = 1.7%