Chapter 7
I am a fixed number of particles often used in stoichiometry problems.
What is Avogadro's Number (6.022 x 1023)?
I am a type of change in thermochemistry that releases energy! What type of change am I?
What is Exothermic change?
Name at least one element with an exception to the octet rule, this could be an expanded octet, or a duet.
What is P, S, Xe, Cl, Br, Se,He, H, I?
Which of the following molecules would have the largest London dispersion forces?
C8H10
CH4
C15H35
C2H7
What is C15H35? (The largest molar mass will have the strongest London Dispersion Forces)
What is the nomenclature for this compound: (NH4)3PO4?
What is Ammonium Phosphate?
A sample of NaCl weighs 167 g. How many atoms of NaCl are there?
NaCl molar mass: 58.44 g/mole
What is 1.72 x 1024 molecules NaCl?
I am known as the Specific Heat Capacity Equation used in thermochemistry.
What is q=mcΔT?
There are two geometries found in chemistry, what are they?
What is electron group geometry and what is molecular geometry?
These elements are able to form hydrogen bonds due to their high levels of electronegativity. What are these elements? (must name 2/3 to get points)
What is nitrogen, oxygen, and fluorine?
What is the name of this compound that includes a polyatomic ion: Pb(OH)4?
What is Lead (IV) Hydroxide?
Determine the mass (grams) of NH3 that can be produced from 32 grams of N2 in the following equation:
N2 (g) +3H2 (g)→ 2NH3 (g)
Molar mass for N2: 28.02 g/mole
Molar mass for NH3: 17.05 g/mole
What is 39 g NH3?
A student must use 225 mL of hot water in a lab procedure. Calculate the amount of heat required to raise the temperature of 225 mL of water from 20.0 degrees Celsius to 100.0 degrees Celsius.
The density of water is 4.184 g/mL, so let us assume that 225 mL is actually 225 g!
Please write your answer in kJ (kilojoules).
What is 75.3 kJ?
What are the electron and molecular geometries of CO2 (Carbon Dioxide)?
What is linear geometry? (both molecular and electron geometries)
Which molecule is an example of hydrogen bonding?
a) H2O (water)
b) CH4 (methane)
c) H2 (hydrogen gas)
d) C2H6 (ethane)
Balance the equation below (also name the compounds in the reaction):
Na2CO3 + CaCl2 → NaCl +CaCO3
What is: Na2CO3 + CaCl2 → 2NaCl +CaCO3?
If 3.964 grams of NaI are produced, how many grams of Na2S were reacted?
Molar Masses:
NaI: 149.89 g/mole
Na2S: 78.05 g/mole
What is 1.032 g of Na2S?
A candy bar contains 333 Cal of nutritional energy. How many joules (J) does it contain?
Remember:
1000 cal =1 Cal
1 cal = 4.184 J
What is 1.39 x 106 J?
What are the electron and molecular geometries of CH4 (methane)?
What is tetrahedral geometry? (both electron and molecular geometry)
True or false, dipole-dipole forces are found in ALL molecules (polar and non-polar)?
What are polar molecules?
What is the name of this compound: LiNO2?
What is Lithium Nitrite?
How many grams of water are made from 2.2 moles of oxygen gas with hydrogen gas, given the balanced equation: 2H2 +O2 → 2H2O. The molar mass of water
What is 79 grams of water? (Remember sig figs)!
A 15.0 g piece of cadmium metal absorbs 134 J of heat while rising from 24.0 degrees Celsius to 62.7 degrees Celsius. Calculate the specific heat of cadmium.
Hint:
Use q=mcΔT & rearrange the equation to solve for c!
What is 0.231 (J/g degrees Celsius)?
What are the electron and molecular geometries of H2O? (water)
What is tetrahedral (electron geometry) and what is bent (molecular geometry)?
Rank these dispersion forces from weakest to strongest:
London Dispersion Forces
Ion Dipole Forces
Dipole-Dipole Forces
Hydrogen Bonding Forces
What is, (weakest to strongest) London Dispersion Forces, Dipole-Dipole Forces, Hydrogen Bonding Forces, Ion-Dipole Forces.
Balance the equation below (also name the compounds in the reaction):
Ca3(PO4)2 + Al2(SO4)3 → CaSO4 + AlPO4
What is Ca3(PO4)2 + Al2(SO4)3 → 3CaSO4 + 2AlPO4?