Unit 1 Flashcards (term 2)

What is a mole?

A mole is a metric unit for a quantity. One mole equals 6.02×10 to the 23rd objects.

Why are moles so big?

Because Atoms molecules and electrons are very small

How much does one electron weigh

It’s mass is almost 0

Where can you find the atomic mass?

It’s the red number on the periodic table

What is the atomic mass

It is the sum of protons and neutrons

What do you put instead of times 10 on your calculator when solving something to do with moles

You put EE

Moles are used to count what?

Atoms, molecules, etc.

The empirical formula is the simplest ratio of what

Moles

If a ratio is within .1 of a whole number, can you round it off?

Yes you can

What are the steps to determining the empirical formula?

Step one change grams to moles step two divide by the smaller role and the ratio becomes a subscript step three use a multiplier if necessary

What are subscriptions required to be?

Whole numbers and small

With empirical formula, what amount in grams of a sample should you always assume?

100 g

What must you convert percent to in empirical formula?

Grams

What are requirements of a molecular formula?

It must be a multiple of the empirical formula. It must be a whole number, and you must be given the molar mass in the problem.

How do you determine the molecular formula?

Step one you must determine the empirical formula mass or Mr. Miller, sir then divide the molar mass by the empirical formula mass and then finally multiply the subscript in the empirical formula by the multiplier.

What is the percent composition formula?

The number of amount that is specific divided by the total

Is a quanitity of particles considered a mole

Yes

Is the red number considered a mole?

yes

It is false or true that percent error is always a positive value or 0

True

What does empirical mean?

It means something determined by experiments when 2 answers are correct.