Chemistry Terms
This is made up of two or more elements in a fixed proportion.
What is a compound.
This is the first step in using dimensional analysis.
What is determine what you are looking for.
0.00337902270
What is 9.
Calculate the mass of an object with a density of 2.78 g/ml and a volume of 48ml.
What is 130 grams.
A measurement is ____ if it yields a result that is very close to the true or accepted value
What is accurate
What two things are pure substances?
What are elements and compounds
These are equivalent values used to change units in dimensional analysis.
What is conversion factor.
This is the reason zeros are not significant in this value:
0.00048
What is the zeros are at the beginning of a number.
Find the volume in mL of 8.91 grams of water.
What is 8.91 mL.
A series of laboratory measurements of lead’s density are all close together, but are far away from lead’s actual density. This group of measurements is
What is precise
This is a type of change that does not alter a substance's chemical composition.
What is a physical change.
Convert 36 seconds to hours.
What is .01 hours.
(4.89 - 3.2) x 7.22 =
What is 12.
What is .076 g/cm3
What is the formula for percent error?
What is |Measured value - true value| / true value * 100
This is how we set up a conversion factor
What is units you have * (what you want/what you have)
Convert 400. miles to inches. (Remember sig figs)
(1 mi = 1609 m)
(1 m = 39.4 in)
What is 25,400,000 inches or 2.54 x 107
These are the types/type of measurements that require sig figs.
What is all measurements done in chemistry.
These are the two units of density.
What is g/mL and g/cm3
Jeff was directed to weigh a 500 g mass on the balance. After quickly measuring and not getting an accurate read, he reported the mass as 413 g. What is his percent error?
what is 17.4%
This is a system that can not hold in the entire mass of the reaction that occurs (think baking soda and vinegar)
What is an open system
Convert 50 miles to meters
80,467.2 meters
Rounding to two significant figures (based on the value "50 miles"), the final answer is:
8.0×10^4 m
7.90 x 10 46 contains this many sig figs.
What is three.
If the density of an object is 2.87 x 10-4 lbs/L, what is its density in g/mL? (1 kg = 2.2 lbs)
1.3×10−4 g/mL.
Mr. Sherman was assigned to determine the density of a sample of nickel metal. The actual density of the metal was 6.44 g/mL and she had a 1.32% error. What are the two possible values she measured for the density?
What is 6.53 g/mL or 6.35 g/mL