Jason Bourne
The type of reaction for this chemical equation:
H2O2 -> H2O + O2
What is decomposition?
The coefficients for this chemical equation:
H2 + O2 -> H2O
What are 2,1,2?
2H2 + O2 -> 2H2O
Hydrogen peroxide decomposes into water and oxygen gas. The reaction occurs at room temperature, but it's very slow. Manganese oxide is added to the hydrogen peroxide to increase the speed of the reaction. MnO is an example of this.
What is a catalyst?
Mass, length, and volume are all examples of this type of physical property.
What is an extensive property?
Gas production is a good clue of this type of change.
What is a chemical change?
Solid aluminum (Al) reacts with chlorine gas (Cl₂) to form solid aluminum chloride (AlCl₃). This is the type of reaction just described.
What is synthesis?
Aqueous sodium hydroxide (NaOH) reacts with aqueous hydrochloric acid (HCl) to form aqueous sodium chloride (NaCl) and liquid water (H₂O).
NaOH(aq) + HCl(aq) -> NaCl(aq) + H2O(l)
This is the Law of Conservation of Mass.
What is that matter cannot be created or destroyed; i.e. The mass of a closed system is constant?
Fermentation is the name of the process in which yeast bacteria convert sugars to alcohols and CO2. This is a good example of this type of change.
What is chemical? (Gas production)
A child constructs a paper airplane by folding a piece of paper. This physical change is this. (irreversible or reversible)
What is reversible?
Aqueous silver nitrate (AgNO₃) reacts with aqueous sodium chloride (NaCl) to form solid silver chloride (AgCl) and aqueous sodium nitrate (NaNO₃). This is the type of reaction just described.
What is Double-Replacement?
Solid aluminum (Al) reacts with aqueous copper(II) chloride (CuCl₂) to form aqueous aluminum chloride (AlCl₃) and solid copper (Cu).
2Al(s) + 3CuCl2(aq) -> 2AlCl3(aq) + 3Cu(s)
These are present at the beginning of a chemical reaction.
What are reactants?
Two liquids are mixed. They totally dissolve once heated and stirred. The change that has occurred is most likely this. (and why.)
What is physical because none of the clues for a chemical change are present?
Two substances are mixed. The thermometer detects a drop in temperature. This is most likely this type of change. (and why.)
What is chemical because of energy transfer?
This type of reaction.
A + BC -> AC + B
What is Single-Replacement?
This is the reason we balance chemical equations.
[Teacher Discretion]
Key: Law of Conservation of Mass
When a compound is broken down, one is left with these.
What are elements?
This is a good explanation of why a physical process cannot reverse a chemical change.
[Teacher Discretion]
Key: Physical processes do NOT alter composition. Chemical processes DO alter composition.
Halogens often bond with themselves to create molecules like Cl2, I2, and Br2. Are these examples of elements or compounds?
What are elements? [A compound is a combination of 2+ elements]
DAILY DOUBLE
Ace is impersonating several cast members from this TV show.
What is Star Trek?
This is the balanced chemical equation for the combustion of propane (C3H8).
C3H8(g) + 5O2(g) -> 3CO2(g) + 4H2O(l)
DAILY DOUBLE!!!
Ace is impersonating this actor.
Who is William Shatner?
This type of change is occurring when candle wax melts.
In an experiment, a technician has to take 3 different sized samples of a material. They measure the samples' volumes and temperatures. Which of these measurements (if any) should the tech expect to remain the same? (and why.)
Temperature. (The intensive property)