Mr. Burkholder

soburkho@smsd.org

Ch 1 A PowerPoint Notes

Geico.ring_ding.mp3

Mass/ Matter is anything that has mass

and takes up space. Wrong!!!

Tell your chemistry teacher he was wrong.

Mass: resistance to change in motion from

a force. Which is harder to move: me or

the wall? Therefore which has more mass?

Qualitative measurements-

descriptive nonnumeric form. Opinion or survey

example:

How hot is it in here?

Quantitative measurements- definite form, numbers

Can be measured with a device like a meter stick. ex: How hot is it?

Accuracy- closeness of a measurement to the actual value,

correctness, or truth.

How long are these pencils?

Precision- How close the measurements are to each other.

Repeatability. or

12.5cm is more precise then 12cm

Is significant figures about accuracy or precision?

Add: significant figures to precision WOD?

Precision- How close the measurements are to each other

or

12.5cm is more precise then 12cm(Similar to # of decimal places)

Which is more precise?

A.) 3B.) 3.14C.) 3.14159265

Precision- How close the measurements are to each other.For a GROUP of numbers, the

smaller the range, the more precise.• Which is more precise?

• A.) 3, 4, 5

• B.) 3.14, 6.27, 9.14

• C.) 3.14159265, 6.276584, 9.14159265

Precision- How close the measurements are to each other.For a GROUP of numbers, the

smaller the range, the more precise.• Which is more precise?

• A.) 3, 4, 5

Ans Range = 5-3 = 2 (Closest Grouping)• B.) 3.14, 6.27, 9.14 Range = 9.14-3.14 = 6• C.) 3.14159265, 6.276584, 9.14159265

Range = 6

Explain accuracy and precision for each of the three targets?

Scientific notation: The first number must always have the correct number

of sig figs.

  0.0001 = 1 x 10-4

0.00045 = 4.5 x 10-4 5.4 = 5.4 x 100 0.000000001= 1 x 10-9 45000000 = 4.5 x 107

How many significant figures?