WEEK04A

Question 1

usually written as a number with an appropriate unit.

Answer 1

measured quantity

Question 2

how many fundamental units do we have

Answer 2

7

Question 3

enumerate the base quantities

Answer 3

length
mass
time
electrical current
temperature
amt of substance
luminous intensity

Question 4

unit symbol for length

Answer 4

m, meter

Question 5

unit symbol for mass

Answer 5

kg, kilogram

Question 6

unit symbol for time

Answer 6

s, seconds

Question 7

unit symbol for electrical current

Answer 7

A, ampere

Question 8

unit symbol for temperature

Answer 8

K, kelvin

Question 9

unit symbol for amt of substance

Answer 9

mol, mole

Question 10

unit symbol for luminous intensity

Answer 10

cd, candela

Question 11

properties of density

Answer 11

intensive property
usually decreases with temp
si unit: kg/m3

Question 12

formula for density

Answer 12

d=m/v

Question 13

formula for mass

Answer 13

m=dv

Question 14

formula for volume

Answer 14

v=m/d

Question 15

what is temperature

Answer 15

Average kinetic energy of particles in an object/system

Question 16

f to c formula

Answer 16

Tc=(Tf-32)5/9

Question 17

c to f formula

Answer 17

Tf=9/5Tc+32

Question 18

c to k formula

Answer 18

Tk=Tc+273.15

Question 19

melting point of sulfur

Answer 19

113 degrees celsius

Question 20

normal body temp

Answer 20

37 degrees temp

Question 21

boiling point of mercury

Answer 21

357 degrees celsius

Question 22

what temperature is celsius and fahrenheit equal

Answer 22

-40 degrees celsius and fahrenheit

Question 23

result of metal expansion

Answer 23

density decrease

Question 24

density decrease is the result of

Answer 24

metal expansion

Question 25

an increase in what, causes the density to decrease

Answer 25

volume

Question 26

does the mass change when a metal is heated

Answer 26

no, the mass will never change but can increase in volume

Question 27

the procedure we use to convert between units and in solving some chemistry problems

Answer 27

Dimensional analysis or the factor-label method

Question 28

To apply dimensional analysis we use the relationship:

Answer 28

GIVEN QUANTITY x CONVERSION FACTOR = DESIRED QUANTITY

Question 29

what is accuracy

Answer 29

refers to the closeness of a measured value to the standard value or the true value of the measurement

Question 30

what is precision

Answer 30

refers to the closeness of two or more measurements to each other

Question 31

exact numbers obtained from definitions or by counting numbers of objects can be considered to have

Answer 31

an infinite number of significant digits. These numbers cannot be used in determining the least number of significant digits.

Question 33

1in=

Answer 33

2.54cm 25.4mm

Question 34

1ft=

Answer 34

12in

Question 35

1cm=

Answer 35

10mm