Lecture 2 Flashcards Preview

Chemistry 1110 > Lecture 2 > Flashcards

Flashcards in Lecture 2 Deck (10)
Loading flashcards...
1

produces a number and describes a property in terms of how much

quantitative

2

made using only the senses and is expressed using words rather than numbers

qualitative

3

tells the amount of the quantity measured

number

4

tells the type of quantity measured

unit

5

the measure of how closely individual measurements agree with each other

precision

6

how close the individual measurement are to the true value

accuracy

7

______ ________ don't have uncertanties

exact numbers

8

4 steps to dimensional analysis

1. identify the known and desired quantities
2. write down known quantity - leave some working space by drawing a horizontal line - and set known quantity equal to units of the desired quantity
3. determine the conversion factor for the equation
4. carry out the necessary arithmetic to solve the problem

(known amt.) x conversion factor (desired units/known units) = desired units

9

ratio that shows how one unit of measure is related to another unit of measure

conversion factor (ex. 1 hr = 60 min)

1hr/1hr = 60min/1hr........or 60min/1hr

10

3 rules for zeroes being significant figures

1. sandwiched between numbers (109)
2. trailing zeroes in decimal place (0.03400)
3. trailing zeroes with decimal point following (180 or 1.80)