Ch 9 Reviewthe basics

.This is just a review of simpler concepts or old material that you should know to be successful with stoichiometry

#1

O1 mole of NaCl would equal

6.022 x 1023 atoms. (F…NaCl is compoud)

True or False

#2

OThere are 22.4 Liters of gas in 1 mole of ANY gas at STP.

O(T)

True or False

#3

OIn order to find the molar mass of a compound, you need to use the periodic table to look up ATOMIC NUMBERS.

O(F…need atomic masses)

True or False

#4

O1 mole of carbon is equal to 12.011 grams.

O(T)

True or False

#5

OAvogadro’s number is equal to 22.4 L.

O(F it is 6.022 * 1023)

True or False

#6

O1 mole of molecules is equal to Avogadro’s number of molecules

O(T)

True or False

#7

OThe mole is a handy conversion factor because it can be equal to so many different things.

O(T)

True or False

#8

OIt would be impossible to hold 1 mole of any substance in the palm of your hand.

O(F you can hold a mole of H atoms)

True or False

#9

OThe molar mass of Oxygen gas is 16.00 grams

O(F…Oxygen gas is diatomic so 32.00 g)

True or False

#10

OHow many sig figs in 12.00?.

O(4 sig figs)

#11

OHow many sig figs in the number 6.022 x 1023

O(4 sig figs)

#12

OThe formula for Iron (II) Nitride is...

O(Fe3N2)

#13

OThe charge on a beryllium ion would be….

O(+2)

#14

OWrite he formula for dinitrogen trioxide.

O(N2O3)

#15

ODisulfur Trioxide is a covalent compound

O(T)

True or False

#16

ONaCl is an ionic compound

O(T)

True or False

#17

OIn order to calculate from mass to moles, you must use Avogadro’s number

O(F, you need molar mass)

True or False

#18

OIn order to calculate from moles to liters, you must use the molar mass of the gas.

O(F, you need the conversion 22.4L/1mol)

True or False

#19

OIn order to calculate from atoms to moles, you will need to use 6.02 x 1023.

O(T)

True or False

#20

OHow many atoms 1 formula unit of NaOH.

O(3)

#21

OHow many Cl atoms in 1 mole of Carbon Tetrachloride, CCl4?

Just show work.O( 6.022x1023 x 4)

#22

O1 mole of iron atoms is enough for a large building.

O(F, it is about the size of ping pong ball)

True or False

#23

O1 mole of xenon gas will take up much more space than 1 mole of He gas.

O(F, 1 mole of all gas = 22.4 L )

True or False

#24

OIt is impossible to calculate the molar mass of a substance if you do not know its formula.

O(T)

True or False

#25

OThe limiting reactant will be the reactant that produces the most product.

O(F)

True or False

#26

OTo calculate percent yield, you must be given the actual yield and have to use the balanced equation to calculate the theoretical yield

O(T)

True or False

#27

OActual yield is 3.00g and theoretical yield is 4.00g. What is the %yield?

O(75%)

#

OThe number 0.0034 has 2 sig figs

O(T)

True or False

#

OIf you multiply 25.3 by 2.9 your final answer will have 3 sig figs

O(F, it has to match the sig figs of the least so it would have 2 sig figs)

True or False