Chemical Reactions
Mole Calculations
Stoichiometry
Thermodynamics
Bonding & Molecular Geometry
100
What are the 5 types of chemical reactions we learned about?
Synthesis, Decomposition, Single Displacement, Double Displacement, Combustion
100
What is the molar mass of Al2O3?
101.96 g/mol
100
2H2+O2→2H2O
How many moles of H₂O are produced from 5.0 moles of O₂?
10.0 moles of H2O
100
What is an endothermic reaction/process?
A reaction/process that absorbs energy
100
What type of bond forms between sodium and chlorine?
Ionic
200
Predict the product + balance the equation:
Ca (s) + N2 (g) -->
3 Ca (s) + N2 (g) --> Ca3N2 (s)
200
How many molecules are in 2.5 moles of H₂O?
1.51 x 1024 molecules H2O
200
N2+3H2→2NH3
If 4.13 moles of H₂ react, how many moles of NH₃ can form?
2.75 moles of NH₃
200
If a reaction releases 250 kJ of heat, what is the sign of q?
Negative
200
Draw the Lewis structure for HCN.
300
What is the solid product of this reaction?
Na2S (aq) + CaCl2 (aq) -->
CaS(s)
300
What is the mass of 0.75 moles of NaCl?
43.83 grams NaCl
300
6 Li + N2 --> 2 Li3N
How many grams of lithium are needed to form 1.5 mol of lithium nitride?
31.23 grams of lithium
300
Calculate the heat absorbed when 50.0 g of water is heated from 20°C to 35°C.
(c=4.18 J/g°C)
3,135 Joules
300
What can be an electron domain?
Bonds and lone pairs
400
What has to be true for single displacement to result in NO reaction?
The lone element must be less reactive than the ion it would replace.
400
How many moles are in 44.01 g of CO₂?
1.00 mole CO2
400
C + O2 --> CO2
How many liters of oxygen gas are needed to form 185 g of CO2?
94.16 liters of oxygen gas
400
A 65 g sample of a substance releases 3900 J of energy while cooling from 45°C to 38°C. What is the specific heat of the substance?
8.6 J/(g°C)
400
What is the difference in how valence electrons form ionic bonds vs covalent bonds?
In ionic bonds, electrons are fully transferred between atoms. In covalent bonds, electrons are shared.
500
What coefficients would be used if balancing:
C18H30O2 + O2 --> CO2 + H2O
2, 49, 36, 30
500
A sample contains 7.11×1024 atoms of aluminum. How many moles is this?
11.8 moles of aluminum
500
6 Na + Al2O3 --> 2 Al + 3 Na2O
How many atoms of sodium are needed to fully react 92 g of aluminum oxide?
3.26 x 1024 atoms of sodium
500
A 45.0 g piece of metal initially at 95.0°C is placed into 100.0 g of water at 22.0°C. After a few minutes, the temperature of both the metal and the water reaches 28.5°C. Assume that the specific heat capacity of water is 4.184 J/g°C. Determine the specific heat capacity of the metal.
0.909 J/g°C
500
What is the molecular geometry of NH3?
Trigonal pyramidal