Lecture 4/30

Question 1

What is the equation for density?

Answer 1

density = mass / volume

Question 2

What is an intensive physical property?

Answer 2

independent of amount

Question 3

what is an extensive physical property?

Answer 3

dependant on amount

Question 4

What is accuracy?

Answer 4

closest to true value

Question 5

What is precision?

Answer 5

how repeatable the measurement is

Question 6

What are significant figures?

Answer 6

number of digits that must be reported to represent the accuracy of the measuring device.

Question 7

3 purposes of significant figures:

Answer 7

1.) Report our own measurements
2.) to recognize the number of sig. figs. in the measurements of others.
3.) Write scientific notation correctly

Question 8

What are 2 rules for graduated devices?

Answer 8

• determine the size of the smallest measurement
• estimate one value to the right

Question 9

What are the 4 rules of sig. figs.?

Answer 9

• every non-zero figure is significant
• embedded zeros are significant
• leading zeros are never significant
• trailing zeros are significant if an explicit decimal point is written.

Question 10

What is a meniscus?

Answer 10

curved surface of a liquid

Question 11

Where do you measure on the meniscus?

Answer 11

in the middle.

Question 12

What is a convex meniscus?

Answer 12

Meniscus that dips up

Question 13

For multiplication and division, how many sig figs will the product have?

Answer 13

same number of sig. figs. as the measurement with the fewest sig. figs.