CHEMISTRY I- CHAPTER 2

Question 1

What is a base unit

Answer 1

a defined unit in a system of measurent that is based on an object or event

Question 2

What is the base unit of time

Answer 2

second

Question 3

second = ?

Answer 3

defined at the frequency of the radiaton of celsium -133

Question 4

base unit of lenght

Answer 4

meter

Question 5

meter = ?

Answer 5

the distance the light travles in a vacuum in 1/299,792, 458 of a second

Question 6

base unit of mass

Answer 6

kilogram

Question 7

kilogram= ?

Answer 7

the cilinder of Pt and Ir kept in France

Question 8

base unit of temperature

Answer 8

kelvin

Question 9

kelvin

Answer 9

0 K where all the particles were all their lowest possible energy state

Question 10

why kelvin does not have the °

Answer 10

because it is an absolute value number, it cant be negative

Question 11

Fahrenheit

Answer 11

(°C * 9/5) + 32

Question 12

Celsius

Answer 12

(°F - 32) * 5/9

Question 13

Kelvin

Answer 13

C + 273.15

Question 14

what is a derived unit

Answer 14

a unit that is defined by a combination of base units.

Question 15

volume

Answer 15

the space ocuppied by an object

Question 16

liter

Answer 16

equal to one cubic decimeter (dm3) . 1L = 1dm3

Question 17

density

Answer 17

physical property of matter used to identity element.

mass divided by volume

Question 18

scientific notation

Answer 18

used to express really big or small numbers ( 1 * 10 a la a)

Question 19

dimensional analysis

Answer 19

system aproach to problem solving that uses conversion factors to move, or convert, from one unit to another.

Question 20

conversion factors

Answer 20

a ratio of equivalent values having different units

Question 21

accuracy

Answer 21

how close a measured value is to an accepted value

Question 22

precision

Answer 22

how close a series of measurents are to one another

Question 23

error

Answer 23

the difference between an experimental value and an accepted value

Question 24

percent error

Answer 24

expreses error as a precentage of the accepted value

Question 25

significant figures

Answer 25

reported digits, include all know digits plus one estimated digit

Question 26

2 things a conversion factors should accomplish

Answer 26

1. it must cancel one unit and introduce a new one.
2. all the units except the desire unit must cancel