Worksheets7.3 Energy Changes in Reactions
Total questions: 12
Worksheet time: 6mins
Energy changes in chemical reactions are determined by changes that occur in chemical bonding.
True
False
____ is the energy stored in the chemical bonds of a substance.
Entropy
Heat energy
Chemical energy
Kinetic energy
____ is a measure of the average kinetic energy of the particles in a sample of matter.
Bond energy
Temperature
State of matter
Mass
The amount of energy needed to raise the temperature of one gram of a substance one degree Celsius is the _____.
Degree unit
Joule
Specific heat
Heat unit
In a chemical reaction the heat that is released or absorbed is measured with a _____.
calorimeter
furnace
cup
timer
A chemical reaction that releases energy to its surroundings is called a(n) ____.
spontaneous
endothermic
exothermic
entropy
A chemical reaction that absorbs energy from its surroundings is called a(n) _____.
spontaneous
endothermic
exothermic
entropy
The measure of the disorder or randomness of a system is called entropy.
Determine whether entropy is increasing or decreasing in the following:
H2O(g) → H2O(s)
Increasing entropy
Decreasing entropy
The measure of the disorder or randomness of a system is called entropy.
Determine whether entropy is increasing or decreasing in the following:
2N2O5(g) → 4NO2(g) + O2(g)
Increasing entropy
Decreasing entropy
The measure of the disorder or randomness of a system is called entropy.
Determine whether entropy is increasing or decreasing in the following:
Na+(aq) + Cl-(aq) → NaCl(s)
Increasing entropy
Decreasing entropy
If the Gibbs Free Energy (ΔG) of a system is negative is the reaction spontaneous, at equilibrium or non-spontaneous?
spontaneous
non-spontaneous
equilibrium
Chemical reactions involve the breaking of chemical bonds in the reactants and the formation of chemical bonds in the products.
True
False
