CHEM Module 0 - Measurements

______________________ is a quantitative observation consisting of two parts, number and scalar

Measurement

Measurement is a quantitative observation consisting of two parts, ___________ and ______________

number
scalar

_________ and _______ is the unit and abbreviation for mass

kilogram
kg

__________ and _______ is the unit and abbreviation for length

meter
m

_________ and _________ is the unit and abbreviation for time

second
s

_________ and _________ is the unit and abbreviation for temperature

kelvin
K

__________ and __________ is the unit and abbreviation for electric current

ampere
A

__________ and __________ is the unit and abbreviation for amount of substance

mole
mol

A digit that must be estimated is called _____________

uncertain

A measurement always has some degree of ___________

uncertainty

Record the certain digits and the ________ uncertain digit

first

______________ is the agreement or nearness of a particular value with the accepted or true value

accuracy

_____________ is the degree of agreement among several measurements of the same quantity. It is the nearness of the values with each other

precision

For CONVEX meniscus, the volume is read ___________ the liquid curve

above

for CONCAVE meniscus, the volume is read at the ___________ of the liquid curve

bottom

What are the 5 rules for counting significant figures?
1.
2.
3.
4.
5.

1. Nonzero integers

2. Leading zeros

3. Captive zeros

4. Trailing zeros

5. Exact numbers

_________________ is the rule applied wherein these integers always count as significant figures

nonzero integers

__________________ is the rule applied wherein zeros that precede all the nonzero digits are not significant

leading zeros

__________________ is the rule applied wherein zeros between nonzero digits always count as significant figures

captive zeros

_________________ is the rule applied wherein zeros at the right end of the number are significant only if it contains a decimal point

trailing zeros

_______________ is the rule applied wherein these numbers do not influence the number of significant figures as the DO NOT involve measurements

exact numbers