Balancing reactions
Balance the following:
H2 + N2 -> NH3
3 H2 + N2 -> 2 NH3
What is a mole?
A unit of measurement in chemistry.
6.02x1023
How many hours are in 5 days?
120 hours
What is the law of conservation of mass?
The law of conservation of mass states that mass cannot be created or destroyed and mass is constant through a chemical reaction.
What is the following reaction:
2 H2O -> 2H2 + O2
A decomposition reaction
Balance the following:
H2 + O2 -> H2O
2 H2 + O2 -> 2H2O
What are the units for molar mass?
grams/ mole
How many seconds are in 1 day?
86,400 seconds
What is the law of conservation of matter?
The law of conservation of matter states that matter cannot be created or destroyed. Matter is constant throughout a chemical reaction it just gets rearranged.
What is the following reaction:
N2 + 3 H2 -> 2 NH3
A combination reaction
Balance the following:
CH4 + O2 -> CO2 + H2O
CH4 + 2O2 -> CO2 + 2H2O
What is the molar mass of oxygen (O)?
15.999 g/mol
If you have 35 grams of chlorine (Cl) how many moles of chlorine do you have?
about 1 mole
What is the most common system in chemistry? Describe what it is too.
An open system where matter and energy can be exchanged with the environment.
What is the following reaction:
CuCl3 + 3 NaOH -> Cu(OH)3 + 3 NaCl
A double displacement reaction
Balance the following:
C3H8 + O2 -> CO2 + H2O
C3H8 + 5O2 -> 3CO2 + 4H2O
Why are the masses for 1 mole of carbon (C) and hydrogen (H) different if they have the same amount of matter present?
They have different size atoms, so carbon weighs more because carbon atoms are bigger
A reaction requires 10 moles of Neon gas (Ne), how many grams of neon are required?
200 g of neon
What is a closed system? Describe it too
A closed system allows energy to be exchanged with the environment but not matter
What is the following reaction:
HCl + NaOH -> H2O + NaCl
A neutralization reaction
Balance the following:
C6H12O6 + O2 -> CO2 + H2O
C6H12O6 + 6O2 -> 6CO2 + 6H2O
If a reaction calls for 5 moles of sodium (Na) how many grams of sodium must you measure?
115 g of sodium (Na)
If you finished a reaction and have 100 grams of your final product glucose(C6H12O6). How many moles do you have?
0.55 moles of glucose
What is an isolated system? Describe it too.
An isolated system is a system where both matter and energy cannot be exchanged with the system.
What is the following reaction:
C6H12O6 + 6 O2 -> 6 CO2 + 6 H2O
A combustion reaction