Ch 1 Chemical Measurements

Question 1

methods of analysis (classical vs. instrumental)

Answer 1

classical: using wet chem (ex. amount of analyze)
instrumental: using instruments (ex. properties)

Question 2

sig fig rules (sums + differences)

Answer 2

keep the number of decimals of the
term that has the least decimals

Question 3

sig fig rules (multiply + divide)

Answer 3

keep the number of significant figures of
the term that has the least significant figures

Question 4

sig fig rules (logs)

Answer 4

keep as many digits to the right of the decimal as
there are significant figures in the original number

Question 5

sig fig rules (antilogs)

Answer 5

keep as many digits as there are digits to the
right of the decimal point in the original number

Question 6

formality (F)

Answer 6

Total moles solutes used to prepare a solution/L solution (like molarity before any reaction occurs)

Question 7

w/w ppm

Answer 7

g/10^6 g
micro g/g

Question 8

w/w ppb

Answer 8

g/10^9 g
nano g/g

Question 9

v/v ppm

Answer 9

mL/10^6 mL
mL/m^3

(m^3 = 1000L = 10^6mL)

Question 10

v/v ppb

Answer 10

mL/10^9 mL
micro L/m^3

Question 11

w/v %

Answer 11

g/100mL

Question 12

w/v ppm

Answer 12

g/10^6 mL
micro g/mL
mg/L

Question 13

w/v ppb

Answer 13

g/10^9 mL
nano g/mL
micro g/L