Definitions
What does accuracy refer to in laboratory measurements?
How close you are to the true or correct answer
Accuracy means close to the ______ value.
True or correct
This is how long something is. We measure it in mm or cm.
Length
Digits you can read directly from the instrument are called these digits.
Certain digits
The smallest unit of matter.
Atom
What term refers to REPEATED measurements (answer is repeated or has a lot of numbers)
Precision
Precision means repeated results are close to ______.
each other.
This is how heavy something is. We measure it in grams.
Mass
The one digit you guess between marks is called the ______ digit.
Estimated digit / guess
A pure substance made of only one type of atom.
element
What is the percent error definition?
How close you are to the true answer
If your values are close together but far from accepted, your data is ______ but not ______.
precise but not accurate
This tool measures length.
ruler
Certain digits + one estimated digit together are called _______.
Significant Figures
Two or more different atoms chemically bonded together.
compound
What is the biggest difference between accuracy and precision?
Accuracy - CORRECT
precision - close to each other (repeated)
If your values are close to accepted but spread out, your data is ______ but not ______.
accurate but not precise.
This tool measures mass.
Scale
If a ruler only shows whole centimeters, you should NOT record this.
What is a decimal like 22.37 cm (extra digits)?
Two or more substances mixed together but NOT chemically bonded.
What is a mixture?
What term describes the variability of measurements due to unpredictable factors, resulting in fluctuations around an average value?
Error
Your group measured the mass twice and got 1.81 g and 1.82 g. What does that show?
What is precision? (results are consistent)
To find volume of candy corn, we used this method: water level goes up after the candy is added (What did we do? )
Subtract the values ! (water displacement)
True or False: You always record one estimated digit even if you are not 100% sure.
True
Candy corn has sugar, wax, and dyes mixed together. Is candy corn an element, compound, or mixture?
MIXTURE