Symbols
What is the symbol that represents heat in a chemical reaction?
a triangle
True or False: This chemical equation is balanced.
KCN + HBr ---> KBr + HCN
True
What type of chemical reaction are these 2 models representing?
a + b ---> ab
ab ---> a + b
synthesis reaction
decomposition reaction
What numbers do you use in a chemical equation to write mole ratios?
Coefficients
exo- heat released
endo- heat absorbed
What does the following mean in a chemical reaction? Get all of them correct for the points.
(s)
(l)
(g)
solid, liquid, gas
What coefficients balance this chemical equation?
__C3H8 + __O2 ---> __H2O + __CO2
a. 1, 2, 1, 2
b. 1, 5, 4, 3
c. 2, 2, 2, 2
d. 4, 3, 2, 1
b. 1, 5, 4, 3
What type of chemical reaction are these 2 models representing?
a + bc ---> b + ac
ab + cd ---> ac + bd
single-replacement reaction
double-replacement reaction
What is the mole ratio, based on this chemical equation, for converting from O2 to Fe2O3?
4Fe + 3O₂ —> 2Fe₂O₃
2 mol Fe2O3
___________
3 mol O2
What is a precipitate?
A solid produced from a chemical reaction
Label the chemical equation on the board. There are 5 parts and you must label them all correctly to get the points. No word bank.
I will reveal the correct answer.
What coefficients balance this chemical equation?
__CH4 + __Cl2 ---> __CCl4 + __HCl
a. 2, 3, 2, 3
b. 2, 8, 2, 8
c. 1, 4, 1, 4
d. 1, 2, 1, 2
c. 1, 4, 1, 4
What type of chemical reaction is this model representing?
C?H? + O2 ---> CO2 + H2O
combustion reaction
How many moles of NH₃ are produced when 0.60 mol of nitrogen react with hydrogen? Here is your balanced chemical equation: N₂ + 3H₂ —> 2NH₃. Start with your given and convert using a mole ratio.
1.2 mol NH3
What are spectator ions?
an ion appearing on both sides of an equation, not directly involved in the reaction, just a spectator.
Bonus 500: Remove the spectators from this complete ionic equation. Then give me the equation with the spectators removed. This is the net ionic equation. This question CAN be stolen.
3Na⁺(aq) + 3OH⁻(aq) + Al³⁺(aq) + 3Cl⁻(aq) —> 3Na⁺(aq) + 3Cl⁻(aq) + Al(OH)₃(s)
I will reveal the correct answer.
What does the symbol (aq) mean in a chemical equation?
Balance this chemical reaction.
__Al + __O2 ---> __Al2O3
Tell me the numbers that go in the lines.
4, 3, 2
What type of chemical reaction is this equation?
2NH3 ---> N2 + 3H2
decomposition
Perform stoichiometric calculations using mass relationships to determine the number of grams of NH₃ produced when 5.40 g H₂ react with N₂. The balanced equation is N₂(g) + 3H₂(g) —> 2NH₃(g). Add up your molar masses, start with your given amount, convert with mass, then mole ratio, then mass again. Make sure the value on top is the one you want in your answer.
31 g NH3
What is the correct percent yield formula?
% yield = actual yield/theoretical yield x 100
Which skeleton equation matches this word equation?
Carbon dioxide and water react to produce sugar and oxygen.
a. CO2 + H20 ---> C6H12O6 + O2
b. Na + Cl2 ---> NaCl
c. CH4 + O2 ---> CO2 + H2O
d. C6H12O6 + O2 ---> CO2 + H20
A. CO2 + H20 ---> C6H12O6 + O2
Bonus 200 if you can tell me what this chemical reaction is for in daily life.
Balance this chemical reaction.
__Fe + __O2 ---> __Fe3O4
Tell me the numbers that go in the lines.
3, 2, 1
What type of chemical reaction is this equation?
2Fe2O3 + 3C ---> 4Fe + 3CO2
Perform a stoichiometric calculation using gas volume relationships to determine how many liters of NO₂ are produced when 34 L O₂ react with NO at STP. The balanced equation is 2NO(g) + O₂(g) —> 2NO₂(g). The volume of gas at STP is 22.4 L. Start with your given, convert using 22.4, then a mole ratio, then 22.4 again. Make sure the value on top is the one you want in your answer.
68.1 L NO2