chemistry - ANSWER study of matter & changes which occur in matter
matter - ANSWER anything that occupies space and has mass is made up of
atoms & molecules
element - ANSWER cannot be broken down into simpler substances; basic
material
compound - ANSWER combination of elements which form a new substance
Standard Notation - ANSWER a value is written with one non zero digit to he
left of the decimal point and all other digits to the right coefficient. this number
is multiplied by 10 raised to the appropriate power exponent. Has to be greater
than 1 but less than 10
Ex. 3500--> 3.5 x 10^3
measurement - ANSWER the size, extent, or amount of something, usually in
terms of a unit applied to something observable
ex. 2 parts (number + unit): 26.5 kg
unit - ANSWER a specific quantity of measurement which is adopted as
standard of measurement
measured numbers - ANSWER numbers obtained in some manner through an
act of measurement--> include uncertainty & significant figures
, significant figure (sig. fig.) - ANSWER a digit that is either reliably known or
closely estimated
ex. i have 2 cats, theres 18,000 students at JMU
exact numbers - ANSWER numbers obtained by counting or defined equality.
These are not measured, have infinite sig figs, and has no uncertainty
uncertainty - ANSWER degree of certainty in a measurement
Ex. 18,270 is more certain than 18,000
uncertainty - ANSWER degree of reproducibility in a series of measurements
ex. measuring the temp. outside multiple times
accuracy - ANSWER how close a measurement is to the true value
-it is best to take several readings and take an average the accuracy is based then
on average of the measurement
conversion factor - ANSWER relationship between two equal quantities written
as a fraction
-are equal to their reciprocals since both equal 1 (numerator = denominator)
ex. 1 min= 60 s
dimensional analysis - ANSWER conversion of a measurement in one unit into
another by the use of conversion factors
ex. given unit x conversion factor(s)= desired unit
density - ANSWER the ratio of a substance's mass to its volume
can be used to identify a substance since it is an intensive property since it is
constant for the same substance
matter - ANSWER anything that occupies space and has mass is made up of
atoms & molecules
element - ANSWER cannot be broken down into simpler substances; basic
material
compound - ANSWER combination of elements which form a new substance
Standard Notation - ANSWER a value is written with one non zero digit to he
left of the decimal point and all other digits to the right coefficient. this number
is multiplied by 10 raised to the appropriate power exponent. Has to be greater
than 1 but less than 10
Ex. 3500--> 3.5 x 10^3
measurement - ANSWER the size, extent, or amount of something, usually in
terms of a unit applied to something observable
ex. 2 parts (number + unit): 26.5 kg
unit - ANSWER a specific quantity of measurement which is adopted as
standard of measurement
measured numbers - ANSWER numbers obtained in some manner through an
act of measurement--> include uncertainty & significant figures
, significant figure (sig. fig.) - ANSWER a digit that is either reliably known or
closely estimated
ex. i have 2 cats, theres 18,000 students at JMU
exact numbers - ANSWER numbers obtained by counting or defined equality.
These are not measured, have infinite sig figs, and has no uncertainty
uncertainty - ANSWER degree of certainty in a measurement
Ex. 18,270 is more certain than 18,000
uncertainty - ANSWER degree of reproducibility in a series of measurements
ex. measuring the temp. outside multiple times
accuracy - ANSWER how close a measurement is to the true value
-it is best to take several readings and take an average the accuracy is based then
on average of the measurement
conversion factor - ANSWER relationship between two equal quantities written
as a fraction
-are equal to their reciprocals since both equal 1 (numerator = denominator)
ex. 1 min= 60 s
dimensional analysis - ANSWER conversion of a measurement in one unit into
another by the use of conversion factors
ex. given unit x conversion factor(s)= desired unit
density - ANSWER the ratio of a substance's mass to its volume
can be used to identify a substance since it is an intensive property since it is
constant for the same substance
