It's Elemental, my dear
Writing and balancing equations isn't fun anymore
Stoichi-yawn-etry (6)
Heating up (7)
Gassing me up is not the solution (8 & 9)
100
What is the formula for carbon dioxide?
CO2
100
Name the 5 types of chemical reactions!
Decomposition, Synthesis or Combination, Single Replacement, Double Replacement, Combustion
100
What is the name of the conversion factor that allows you to convert between moles of reactants and moles of products?
The mole ratio.
100
Mr. Barone starts a grill to make some burgers. As the charcoal combusts heat is given off. What kind of thermodynamic reaction is occuring in the charcoal?
An exothermic reaction is occurring in the charcoal.
100
What does STP represent?
Standard Temperature (0oC & 273 K)
Standard Pressure (1 atm)
200
What is the most reactive group of metals?
The Alkali metals (Group 1)
200
Balance the following equation for the reaction!
Li (s) + MgCl2 (aq) -> Mg (s) + LiCl (aq)
2 Li (s) + MgCl2 (aq) -> 2 Mg (s) + 2 LiCl (aq)
200
What is the term for the reactant that limits how much product chemical reactions can produce?
Limiting Reactant
200
Which letter on the PE diagram represents the amount of Potential Energy stored in the products?
D
200
What will happen to the solubility of a gas as temperature increases?
The solubility of the gas will decrease.
300
What are the diatomic elements?
Hydrogen, Nitrogen, Oxygen, Fluorine, Chlorine, Bromine, Iodine
300
Identify the precipitate in the following equation:
AgNO3 (aq) + KCl (aq) -> AgCl (s) + KNO3 (aq)
AgCl (s) - silver chloride
300
Stoichiometry is used to predict the amount of product that a chemical reaction will produce. What is the term for the predicted or expected amount of product that will be formed by a chemical reaction?
Theoretical Yield
300
Does this potential energy diagram represent an endothermic or exothermic reaction?
This PE diagram represents an exothermic reaction.
300
How would you classify a solution that has a greater concentration of hydrogen ions than hydroxide ions?
It is an acid.
400
What are the 3 transition metals that can only form 1 specific charge?
Aluminum, Zinc, Silver
400
Balance the following equation representing the combustion of propane:
C3H8 + O2 -> CO2 + H2O
C3H8 + 5 O2 -> 3 CO2 + 4 H2O
400
Using the following equation, calculate the theoretical yield of hydrogen gas in grams if 20 grams of Hydrochloric acid were reacted.
2 HCl + Mg -> MgCl2 + H2
0.55 g H2
400
Diana was studying different chemical reactions. The following graph represents the temperature data collected when Diana reacted a solution of sodium hydroxide with aqueous hydrochloric acid.
Based on the data provided, would you conclude that this reaction is endothermic or exothermic?
This diagram represents an exothermic reaction.
400
How much NH4Cl will dissolve in 300g of water at 80oC?
198 - 204 g of NH4Cl
500
Ammonium carbonate is commonly used as a smelling salt to help individuals regain consciousness. What is the formula for ammonium carbonate?
(NH4)2CO3
500
Smelling salts are unique crystals used to help boxers regain consciousness after being knocked out. Ammonium carbonate is commonly used as a smelling salt because it decomposes into 3 gases: ammonia, carbon dioxide, and water vapor. Write and balance the chemical equation representing the decomposition of ammonium carbonate. You MUST include states of matter!
(NH4)2CO3 (s) -> 2 NH3 (g) + CO2 (g) + H2O (g)
500
Mr. Barone decided he needed to make more copper(II) chloride for an experiment he was doing. He was able to produce 50 grams of CuCl2 to use. Using the following equation, determine the percent yield of his reaction if he reacted 50 grams of copper to produce the copper(II) chloride.
Cu(s) + Cl2(g) → CuCl2(l)
105.791 g CuCl2 = theoretical yield
47% = percent yield of copper(II) chloride
500
Hydrogen peroxide decomposes when exposed to light or a catalyst such as potassium iodide. The reaction below represents the decomposition of hydrogen peroxide.
- 2 H2O2(aq) → 2 H2O(l) + O2(g)
The following data was collected during the decomposition of hydrogen peroxide. Use the data table provided to determine the heat gained or lost in this reaction.
- Volume of Hydrogen Peroxide - 45 mL
- Density of Hydrogen Peroxide - 1.1 g/mL
- Initial Temperature - 52.0oC
- Final Temperature - 75.3oC
- Specific Heat of Hydrogen Peroxide - 4.20 J/goC
Hint: Density = Mass / volume
The amount of heat lost is 4844.07 Joules.
500
Determine the number of moles of neon gas that would occupy 1250 mL at 0.974 atm and 300. K.
0.05 moles