Save
Busy. Please wait.
or

show password
Forgot Password?

Don't have an account?  Sign up 
or

Username is available taken
show password

why


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.
We do not share your email address with others. It is only used to allow you to reset your password. For details read our Privacy Policy and Terms of Service.


Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
focusNode
Didn't know it?
click below
 
Knew it?
click below
Don't know
Remaining cards (0)
Know
0:00
share
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

Chemistry Test 3-1

measurements

QuestionAnswer
something that has magnitude, size, or amount quantity
size of a quantity determined by a measurement process and described by both a number and a unit magnitude
compare what is to be measured with a previously defined size units of measurement
the choice of unit depends on the quantity being measured
single measurement system agreed on by scientists all over the world SI system
some non-SI units are still used by __ chemists
objects or natural phenomena that are of constant value, easy to preserve, easy to reproduce and practical in size standards of measurement
standards are used to __ compare
basic quantities measured in arbitrary units established by international agreement fundamental quantites
used in measuring fundamental quantities SI base units
the distance between 2 points OR the path traveled by light in a vacuum during a time interval length
the amount of matter in a body mass
duration of an event OR vibrations of Cesium 133 time
degree of hotness or coldness of an object temperature
amount of substance mole
combinations of fundamental quantites so that combinations of units are produced derived units
how do you convert from C to Kelvin? add 273 to the C
used to figure out the # of atoms or molecules in a given amount of substance mole
number of units or fraction of a unit each line on the scale stands for calibration
what is the percent error formula/ %E= Value a- Value e/Value a
since most objects___ expand as the temperature increases, the volume ___ expand; increases
as volume ___ density ___ increases; decreases
good measurements are both ___ and ___ accurate and precise
refers to the closeness of measurements to the correct or accepted value of the quantity measured accuracy
what does accuracy depend upon? 1. how carefully the measurement is done 2. quality of the instrument (in working order/well made) 3. one measruement or the average of one measurement as compared to the accepted value
what is accuracy determined by? percent error
value accepted comes from ___ books or tables
value experimental comes from the experiment or measurement in lab
the numerator of the percent error formula is called ____ absolute error
refers to the closeness of a set of the same quantity made in the same way precision
what does precison depend upon? 1. skillful estimation (your guess) 2. number of divisions in the instrument (calibration) 3. how close several measurements are to each other.
one way to look at precison standard deviation
Created by: lovecamille018
 

 



Voices

Use these flashcards to help memorize information. Look at the large card and try to recall what is on the other side. Then click the card to flip it. If you knew the answer, click the green Know box. Otherwise, click the red Don't know box.

When you've placed seven or more cards in the Don't know box, click "retry" to try those cards again.

If you've accidentally put the card in the wrong box, just click on the card to take it out of the box.

You can also use your keyboard to move the cards as follows:

If you are logged in to your account, this website will remember which cards you know and don't know so that they are in the same box the next time you log in.

When you need a break, try one of the other activities listed below the flashcards like Matching, Snowman, or Hungry Bug. Although it may feel like you're playing a game, your brain is still making more connections with the information to help you out.

To see how well you know the information, try the Quiz or Test activity.

Pass complete!

"Know" box contains:
Time elapsed:
Retries:
restart all cards