Chem 305 PSS
a numerical value and unit that express length, mass or volume.
measurement
When adding or subtracting a number the answer is limited by the measurement having the _____ uncertainty?
most
When determining significant figures read from left to right starting with the first ________?
non zero
the digits in a measurement that exceed the instrumental measurement.
nonsignificant digits
a positive or negative exponent of 10.
power of 10
the process of eliminating digits that are not significant.
rounding off
a method for expressing numbers by moving the decimal place after the first significant digit and indicating the number of decimal moves by power of 10.
scientific notation.
What are exact numbers in reference to significant figures?
they are NOT measurements. They are exacts 6 test tubes, 1 meter = 100 cm
Which term refers to the degree of inexactness in a measurement?
uncertainty
the degree of inexactness in an instrumental measurement.
uncertainty
When multiplying or dividing the answer is limited by the ________.
value with the fewest significant figures
The amount of space occupied by a solid, gas or liquid is its ______?
volume
Are all numbers in a measurement, except placeholders, significant?
Yes
Non significant figures are obtained with a _____.
calculator
a common metric unit of length.
centimeter, cm
How many sig figs in the following? 0.11 0.011 110
each has 2
A number written as a superscript indicating that a value is multiplied by itself is called an _______.
exponent
a number written as a superscript that indicates a value is multiplied by itself.
exponent
a common metric unit of mass.
gram, g
A measurement is obtained using an _______.
instrument
a device for recording or measurement such as length, mass, or volume
instrument
When determining significant figures read from _____ to _____?
left to right
The amount of matter an object has is its?
mass
the quantity of matter in an object.
mass
a common metric unit of volume
milliliter, ml
Are placeholders counted in significant figures?
no
The _______ in a measurement are those digits known with certainty, plus one digit that is estimated.
significant digits
the certain digits in a measurement plus one estimated digit.
significant digits
How many significant digits are in the exact number 155?
None, sig fig rules don't apply
