Mr. Burkholder Ch 1 A PowerPoint Notes

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Presentation transcript:

Mr. Burkholder Ch 1 A PowerPoint Notes

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.) 3 B.) 3.14 C.)

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.) , ,

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 = = 6 C.) , , 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.

= 1 x = 4.5 x = 5.4 x = 1 x = 4.5 x 10 7 How many significant figures?