Chapter 7: Molar Mass
What is the molar mass of O2?
(Units has to be correct for points too)
32 g/mole
What is the limiting factor of stoichiometry
The limiting "ingredient" aka reactant
What 3 things must happen for a successful reaction?
1. Reactants must collide
2. Reactants must collide in the proper orientation
3. There must be enough energy so that when they collide, they can break bonds and form new bonds for the products
What is a Dipole/ Dipole force? Give an example
It is a polar covalent bond.
What are salts?
Ionic bonds
Metal + non metals
What is the molar mass of PO4?
(Units must be correct too)
95 g/mole
What is stoichiometry?
A way to balance a chemical equation like using a recipe; what goes in must come out
What are the 4 environmental factors we can change to increase our success for reaction's rate?
1. Temperature
2. Stirring
3. Concentration
4. Catalyst
What is London Dispersion force?
It is a nonpolar covalent bond
What is the name of this compound: NO3-
Is it monoatomic or polyatomic?
Nitrate
Polyatomic
If I have 3 moles of H2O2, how many grams do I have?
102 grams
Balance this equation:
H2O + O2 --> H2O2
2H2O + O2 --> 2H2O2
Which environmental factors causes the particles to increase in their own energy?
1. Temperature
2. Stirring
3. Concentration
If I have a liquid that has a melting point of 155 °C, but I am at room temperature, what state is it in?
Solid
What makes up a solution?
Solution= Solute + Solvent
If I have 88 grams of NH3, how many moles do I have?
5.18 moles
What is the first step of stoichiometry; why
(Answer both for full points)
Balance the equation; you need the original recipe to know what is limiting
What does the catalyst do?
It does not change the outcome of the reaction's products, it simply lowers the energy that is required to do a reaction (going over a mountain vs going over a speed bump)
Finish this statement: The higher the heat capacity, the _____________________
The higher the heat capacity, the slower the gain/lose of heat
What does saturation mean?
It cannot dissolve anymore
Tell me how grams I have for sucrose (C6H12O6)
Yes, this equation is photosynthesis, and it is balanced
6CO2 + 6H2O --> C6H12O6 + 6O2
180 grams
2H2O + O2 --> 2H2O2
If I have 3 moles O2, then how many H2O2 can I make instead?
9 moles of H2O2
Tell me what happens with all 4 environmental factors that allows us to increase our reaction rate
1. Temperature: Heating up the mixture excites the particles so they move faster; can collide faster and it increases their energy
2. Stirring: we are manually moving the particles to force them to collide with each other
3. Concentration: increasing the concentration increase the particles; more= more chance of colliding with each other
4. Catalyst: lowers the energy required for a reaction to occur
Rank the bonds:
Bonus: What type of forces are they
H2O, NaCl, NH3, CH4
Strongest to weakest:
NaCl, H2O, (NH3)2, CH4
Bonus: Ionic- Hydrogen Bonding- D/D- London Dispersion
What does hypotonic mean?
When there is little salt concentration; increased amount of water in the cell (round like a hippo)