Writing and Balancing Chemical Equations — Unit test Answers
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Which statement is true for most chemical reactions?
A
An energy change occurs during the breaking and forming of bonds.B
The internal energy of the system increases during a reaction.C
Energy is released during the formation of reactants.D
The enthalpy of the products is higher than the enthalpy of the reactants.22
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Consider the following intermediate chemical equations.When you combine the intermediate chemical equations, which substance do you cancel out?
A
PB
Cl
C
Upper P upper C l subscript 3.
D
PCl
23
An arrow is fired at a target on a high wall. How does the energy change between the moment the arrow is fired and the moment it hits the target?
A
The potential energy and kinetic energy remain the same.B
The potential energy decreases as kinetic energy increases.C
The kinetic energy decreases as potential energy increases.D
The kinetic energy remains at zero, but potential energy increases.24
How does the potential-energy diagram for a reaction indicate whether the reaction is endothermic or exothermic?
A
An endothermic reaction has reactants that are lower in energy than products because energy is absorbed to form the products.B
An endothermic reaction has reactants that are higher in energy than products because energy is released to form the products.C
An exothermic reaction has reactants that are lower in energy than products because energy is released to form the products.D
An exothermic reaction has reactants that are higher in energy than products because energy is absorbed to form the products.25
What type of energy is the sum of an object’s potential and kinetic energy?
A
mechanical energyB
electromagnetic energyC
chemical energyD
thermal energyDid you find these answers helpful?
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