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Worksheets5.0 Chemical Reactions
Total questions: 42
Worksheet time: 46mins
Which equation is balanced?
PbO2 + 2H2
SO2 + H20 --> H2SO4
2Na + 2H2O --> 2NaOH + H2
What law governs the balancing of chemical equations?
Law of Conservation of Energy
Law of Conservation of Mass
Law of Gravity
Law of Thermodynamics
_2_H2 + _1_O2 -> _2_H2O
What is the left part of a chemical equation called?
2H2 + O2 ---> 2H2O
Reactants
Yields
Products
Chemical equation
What is the right part of a chemical equation called?
2H2 + O2 ---> 2H2O
Reactants
Yields
Products
Chemical Equation
How many Mn atoms are found in the following compound?
2MnO4
1
2
4
8
What is the little number after an element in a chemical equation called?
Example: H2
Coefficient
Atom
Subscript
Equation
Is the following equation balanced?
Al + O2 ---> 2Al2O3
YES
NO
What is the number before a chemical formula called?
Example: 2H2 + O2 ---> 2H2O
Coefficient
Atom
Subscript
Equation
Which of the following equations are correctly balanced?
12CO2 + H2O ---> C6H12O6 + O2
CO2 + H2O ---> 3C6H12O6 + O2
CO2 + 9H2O ---> C6H12O6 + O2
6CO2 + 6H2O ---> C6H12O6 + 6O2
4Ca(OH)2
Ca + AlCl3 --> CaCl2 + Al
Synthesis
Decomposition
Single replacement
Double replacement
3Mg + N2 --> Mg3N2
Synthesis
Decomposition
Single replacement
Double replacement
NO2 --> N2 + O2
Synthesis
Decomposition
Single Replacement
double replacement
AgF + CaCl2 ---> AgCl + CaF2
double replacement
decomposition
single replacement
synthesis
Which type of reaction is described in the following equation:
C3H8 + 5O2 → 3CO2 + 4H2O
Synthesis
Decomposition
Single Replacement
Double Replacement
Combustion
Is the following equation balanced?
4Fe + 3O2 ---> 2Fe2O3
YES
NO
The number of atoms you begin with in a chemical reaction...
must be the same as the number of atoms you end with
must be an even number
can be different to the number you finish with
changes depending on how much energy is formed
O2(g) + 2 H2 (g) → 2 H2O (g) + Energy
endothermic
exothermic
6 CO2+ 6 H2O + Energy → C6H12O6 + 6 O2
endothermic reaction
exothermic reaction
_____ reactions usually feel hot!
endothermic
exothermic
____ reactions usually feel cold.
endothermic
exothermic
Endo means in or _______.
absorbed
released
Exo means out or ________.
absorbed
released
taken in
given out
In an endothermic reaction, heat is ...
taken in
given out
The graph above is from which type of reaction?
Endothermic reaction
Exothermic reaction
What type of reaction is this?
Exothermic
Endothermic
Energy Producing
No way to tell
concentration
surface area
temperature
reactants
What is the rate of reaction?
How much energy is needed for a reaction to occur.
The energy required to break a bond.
The time it takes for a reaction to occur.
Collision Theory
_______ refers to how much solute is dissolved in
a solution.
Surface Area
Catalyst
Temperature
Concentration
Increasing the ____ causes the particles (atoms
or molecules) of the reactants to move more quickly so that
they collide with each other more frequently and with more
energy.
Catalyst
Surface Area
Temperature
Concentration
What is the process called that changes a set of chemicals into another set? (From a reactant to a product)
Chemical Reaction
Physical Change
Chemical Bonding
Chemical Mixing
What is the energy required to get the reaction started?
Inhibitor Energy
Catalyst Energy
Activation Energy
Surface Energy
What must be met for reactant collisions to result in a successful product?
The reactants must be mixed with each other in the proper proportions.
The reactants must collide with enough energy, and be in the right positions.
The reactants must have enough energy, and form the activated complex.
True or False: Catalysts allow reactions to proceed at a faster rate.
True
False
What do we call a substance that increases the rate of a reaction without being used up during the reaction?
catalyst
product
reactant
