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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.24
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The diagram below shows the temperature dropping from 80°C to 20°C.Molecules that have longer arrows are moving faster. Which statement describes what is happening in this system?
A
Molecules vibrate more as temperature decreases.B
Temperature is not related to the average kinetic energy of a system.C
Kinetic energy decreases as temperature decreases.D
There is no change in average kinetic energy between these two systems.25
An ice cube is placed on a kitchen counter. Which best describes heat flow in this situation?
A
Heat flows from the ice to the counter, causing the molecules in the counter to move more quickly.B
Heat flows from the ice to the counter, causing the molecules in the counter to move more slowly.C
Heat flows from the counter to the ice, causing the molecules in the counter to move more quickly.D
Heat flows from the counter to the ice, causing the molecules in the counter to move more slowly.Did you find these answers helpful?
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