Bond Energy
Which would have a lower bond energy? C-C or C=C
C-C
What type of reaction is this? 2 H2 + O2 --> 2 H2O
synthesis
What type of property describes how a substance reacts with other substances? Physical or Chemical
chemical property
Which type of reaction involves the release of energy? Exothermic or Endothermic?
Exothermic
In the reaction; 2 H2 + O2 --> 2 H2O
What is the product?
H2O
What happens to energy when bonds are formed?
When bonds are formed, energy is released.
Which type of reaction occurs when a single compound breaks down into two or more simpler products.
decomposition
The color of a substance is a; physical or chemical property?
physical property
Which of the following involves the input of energy? breaking a bond or forming a bond
breaking a bond
In the reaction; 2 H2 + O2 --> 2 H2O
What are the reactants?
H2 and O2
What happens to energy during an endothermic reaction?
Energy is absorbed.
Which reaction results in a reaction in which one element replaces another element in a compound.
single replacement
A change that results in the change of a substance's identity is a; physical change or chemical change?
chemical change
What is bond energy?
Bond energy is the energy required to break one mole of bonds in a compound.
Is the reaction: NaCl --> Na + Cl2
balanced or unbalanced?
unbalanced
What is the unit for bond energy?
kj/mol
Which type of reaction is the following:
NaCl + AgNO₃ → NaNO₃ + AgCl
Changing of states of matter is a; physical change or chemical change?
physical change
What distinguishes endothermic from exothermic reactions?
Endothermic reactions absorb energy, while exothermic reactions release energy.
Balance the following: NaCl --> Na + Cl2
2 NaCl --> 2 Na + Cl2
How does bond strength relate to energy required to break it?
The stronger the bond, the more energy is required to break it.
Which type of reaction involves a hydrocarbon reacting with oxygen to produces heat and light; for example, burning wood.
combustion
Give an example of a chemical change.
Answers may vary
How do you calculate the change in bond energy?
To calculate the change in bond energy, subtract the total bond energy of the products from the total bond energy of the reactants.
Balance the following:
Al(OH)3 + H2SO4 --> Al2(SO4)3 + H2O
2 Al(OH)3 + 3 H2SO4 --> Al2(SO4)3 + 6 H2O