Chemical vs. Physical
Chemical Equations
Balancing
Predicting Products
Reaction Types
100
One of the following is NOT a physical change: splitting wood, melting ice, burning wood or dissolving salt in water.
Burning wood
100
Substance(s) that enters a chemical reaction is called this (on the left side of the reaction).
What is a reactant?
100
Balance the reaction: Na + H2O -> NaOH + H2
What is 2Na + 2H2O -> 2NaOH + H2
100
What is the precipitate in this reaction?
AgBr - silver bromide
100
The reaction 2HgO -> 2Hg + O2 is an example of this type of reaction.
What is decomposition?
200
A solid that forms from a solution during a chemical reaction.
Precipitate
200
What are the products in this chemical reaction?
NH3 - ammonia
200
Balance the reaction: HCl + Ca(OH)2 -> CaCl2 + H2O
What is 2HCl + Ca(OH)2 -> CaCl2 + 2H2O
200
Write the products of this single replacement reaction. Don't balance. Would the reaction occur?
Al + HCl -->
--> AlCl3 + H2
Yes, this reaction would occur
200
Single replacement
300
Give 3 signs that a chemical reaction has taken place.
Temp change, light produced, color change, the formation of gas, and the formation of a precipitate.
300
Write the 7 diatomic elements, including subscripts
H2 O2 F2 Br2 I2 N2 Cl2
300
In the formula 5CaSO4, this is the number of oxygen atoms.
What is 20?
300
Predict the products. Don't balance. Would this reaction occur?
Na2S(aq) + KOH(aq) -->
--> NaOH(aq) + K2S(aq)
No, both products are aqueous
300
What reaction type produces a precipitate?
Double replacement
400
What is the term used for "dissolved in water"
Aqueous
400
What symbol is placed over the arrow to indicate that heat is applied to a reaction?
400
Balance the reaction: C3H8 +O2 -> CO2 + H20
What is C3H8 + 5O2 -> 3CO2 + 4H2O
400
Aluminum is combined with oxygen gas. What is the product? Hint: Combine the two elements and balance the charges.
Al + O2 -- > ?
Al2O3
400
What type of reaction is this?
Combustion