UNIT 1: Measurements, Sig Figs, Conversions Flashcards
(24 cards)
Assuming Accuracy
clearly seeing that a measurement is at least ______
Accuracy
being correct with a single measurement
Precision
the reproducibility of measurements
What do you need to add after assuming accuracy?
one more place value after the assumed value
After assuming accuracy, what should you do if you can clearly see that it is directly on that value?
You still need to add another place holder, however, if you are confident that it is exactly on the assumed value you can put a zero in as the place value
Are leading zeros significant?
no
Are ending zeros significant?
If there is a decimal anywhere in the number than yes, if not, then no
Are sandwiching zeros significant?
yes
What do you need to do after rounding a number. (this thing will give you the correct place value of the original number)
you need to add back all place holders with zeros
What should you do if after you’ve rounded a number and added back all place holders and you still don’t have the correct number of sig figs?
You will need to turn your rounded answer into scientific notation
where does the exponent in the standard form of scientific notation come from?
The number of times the decimal place was moved
When adding and subtracting, how do you know the correct number of sig figs your sum/difference has to be?
The number that has the sig fig closest to the left is the number that will tell you what sig fig your answers goes to. You need to determine the place value for that far left sig fig and that is the place value you need to round your sum/difference to.
When multiplying and dividing how do you know the correct number of sig figs your product has to be?
Find the number that has the least number of sig figs. The number of sig figs that number has is the amount of sig figs your product needs to have.
What was scientific notation designed for?
It was designed specifically to put sig figs on the left and place holders on the right.
Which direction in the “get bigger” direction?
the left
Which direction is the “get smaller” direction?
the right
In scientific notation standard form, where does the decimal always go?
To the right of the very first sig fig
A decimal was moved to the left two times, what will the exponent be in standard scientific notation? Why?
It moved left, so the exponent will be positive, and it moved twice, so the answer is 2.
What is the trick to memorizing the top of the metric prefix scale?
Saying The Great Mighty King Made Us Nationalize Pie Forever!
Tera, Giga, Mega, Kilo, Milli, Micro, Nano, Pico, Fento
What is the trick to memorizing the bottom row of the metric prefix scale?
Saying: He Demanded Da Crust
Hecta, Deca, Deci, Centi
What do each of the metric prefixes represent?
They each match up with their assigned place value.
How many place holders (zeros) are in between each metric prefix?
3, meaning that kilo ,10E3, jumps 3 place values to mega, 10E6,
When converting by moving the decimal, what do you need to determine?
How many steps (place holders) comes between the two metric prefixes.
If you are converting a number from kilos to nanos what direction will you need to move the decimal?
Move 12 steps to the right
