Reactions and Energy
The compounds/ elements on the left side of the reaction arrow are called...
reactants
What is a mole?
A number of things
What is the molar mass of CH4?
16.05 g/ mole
What is the reactant that runs out the fastest?
Limiting reactant
The compounds/ elements on the right side of the reaction arrow are called...
products
What is Avogadro's number?
6.02 x 1023 particles
What is the molar mass of CaF2?
78.08 g/ mole
What is the reactant that is left over?
Excess reactant
A reaction that requires energy
Endothermic Reaction
How many moles are in 15.5 grams of NaBr?
0.15 moles
How many particles are in 5.5 moles of HCl?
3.3 x 1024 particles
2 H2 + O2 --> 2 H2O
If you have 4 moles of H2 and 4 moles of O2, what is the maximum amount of H2O you can produce?
4 moles of H2O
A reaction that releases energy
Exothermic Reaction
How many grams are in 4.1 moles of Li2S?
291.35 grams
How many moles are in 5.2 x 1025 particles of NaBr?
86.38 moles
2 H2 + O2 --> 2 H2O
If you have 5 moles of O2 and 5 moles of H2, what is the limiting?
H2 is the limiting
A reaction where the energy of the reactants is lower than the energy of the products
Endothermic Reaction
How many moles are in 184.5 grams of HSO4?
1.9 moles
How many particles are in 2.5 grams of NaF?
3.58 x 1022 particles
2 H2 + O2 --> 2 H2O
If you have 6 moles of H2 and 7 moles of O2
1. How much H2O can you produce?
2. What is the limiting?
3. How much excess do you have?
1. 6 moles of H2O
2. H2
3. 4 moles of O2