Sig Figs
The First Sig Fig Rule, Non-zeros...
What is always count as significant figures
1,234 = 4 sig figs
Na2O + H2O --> ___NaOH
Numbers that will make this equation balanced
Na2O + H2O --> _2_NaOH
What is 2
Mole Ratio definition
What is the relationship between 2 substances in a balanced chemical reaction
A Limiting Reactant does this
What is limits or determines the amount of product that can be formed in a reaction
Equation to get from gram island to mole island A
What is, (# grams) x (1 mol A / molar mass A)
The second Sig Fig Rule, Leading zeros...
What is do not count as significant figures
0.078 = 2 sig figs
___K + Cl2 --> ___KCl
Numbers that will make this equation balanced
_2_K + Cl2 --> _2_KCl
What is 2 and 2
Mole ratio for H2 and O2
What is 2:1
2mol H2 : 1 mol O2
Convert to ______ when comparing for solving problems in limiting reactant equations
What is Moles
Equation to get from Atom island to Mole island A
What is, (# molecules) x (1 mol A / 6.02 x 1023)
The third sig fig rule, Captive zeroes...
What is always count as significant figures
1803 = 4 sig figs
___Fe + S8 --> ___FeS
Numbers that will make this equation balanced
_8_Fe + S8 --> _8_FeS
What is 8 and 8
Mole Ratio for O2 to SO3
2SO3 + O2 ---> 2SO3
What is 1:2
1 mol O2 : 2 mol SO3
3.20 mol Cl2 and 6.70 mol Na react. The limiting reactant is?
What is Cl2
Equation to get from Mole island A to Mole island B
What is, (#mole A) x (# mol B / # mol A)
The Fourth sig fig rule, Trailing zeros...
What is are significant only if the number contains a written decimal point
0.08900 = 4 sig figs
___NaClO3 --> ___NaCl+ ___O2
Numbers that will make this equation balanced
_2_NaClO3 --> _2_NaCl+ _3_O2
What is 2,2 and 3
Mole Ratio for NH3 to H2
N2 + 3H2 ---> 2NH3
What is 2:3
2 mol NH3 : 3 mol H2
For 1 sandwich you need 2 bread, and 1 cheese
You have 60 bread and 100 cheese
What is the Limiting Factor? (reactant)
What is Bread
4NH3 + 5O2 --> 4NO(g) +6H2O
How many moles of nitrogen monoxide are produced from reacting 7.3 moles of oxygen?
What is 5.8 moles NO
The Number of Sig Figs in this Number
1907.8094
What is 8 sig figs
___NH3 + ___O2 --> ___NO + ___H2O
Numbers that will make this equation balanced
_4_NH3 + _5_O2 --> _4_NO + _6_H2O
What are 4,5,4, and 6
# of Mole Ratios in the equation
2H2S(g) + 3O2(g) --> 2SO2(g) + 2H2O(g)
What is 12 mole ratios
2Cu(s) +S(s) --> Cu2S(s)
What is the limiting reagent when 80.0 g Cu reacts with 25.0 g S
What is Sulfur
Cu + ___AgNO3 --> Cu(NO3)2 + ___Ag
If 89.5 grams of Ag were produced, how many grams of Cu reacted?
Cu + _2_AgNO3 --> Cu(NO3)2 + _2_Ag
What is 26.4 g Cu