1Which of the following statements is true?Energy can be created, but not destroyedEnergy can be both created and destroyedEnergy cannot be created or destroyed; it can only be transferred from one form into anotherEnergy can be destroyed, but not created2What term is used to describe a reaction that releases energy to its surroundings?ExothermicThermal decompositionIrreversibleEndothermic3Which of the following is an example of an endothermic reaction?OxidationThermal decompositionNeutralisationCombustion4When investigating energy change in a reaction, why is the solution contained in a polystyrene cup?To prevent heat loss to the surroundingsTo enable heat to be lost to the surroundingsTo stop you burning your fingersTo warm up the solution5The reaction between citric acid and sodium hydrogen carbonate is endothermic. What would you expect to happen to the temperature of the solution?It would increaseIt would remain constantIt would oscillate up and downIt would decrease
Question
1Which of the following statements is true?Energy can be created, but not destroyedEnergy can be both created and destroyedEnergy cannot be created or destroyed; it can only be transferred from one form into anotherEnergy can be destroyed, but not created2What term is used to describe a reaction that releases energy to its surroundings?ExothermicThermal decompositionIrreversibleEndothermic3Which of the following is an example of an endothermic reaction?OxidationThermal decompositionNeutralisationCombustion4When investigating energy change in a reaction, why is the solution contained in a polystyrene cup?To prevent heat loss to the surroundingsTo enable heat to be lost to the surroundingsTo stop you burning your fingersTo warm up the solution5The reaction between citric acid and sodium hydrogen carbonate is endothermic. What would you expect to happen to the temperature of the solution?It would increaseIt would remain constantIt would oscillate up and downIt would decrease
Solution
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The true statement is: Energy cannot be created or destroyed; it can only be transferred from one form into another. This is known as the law of conservation of energy.
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The term used to describe a reaction that releases energy to its surroundings is Exothermic.
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An example of an endothermic reaction is Thermal decomposition. Endothermic reactions absorb energy from the surroundings.
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The solution is contained in a polystyrene cup when investigating energy change in a reaction to prevent heat loss to the surroundings. This helps to ensure that the energy change measured is as accurate as possible.
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If the reaction between citric acid and sodium hydrogen carbonate is endothermic, you would expect the temperature of the solution to decrease. This is because endothermic reactions absorb heat energy from their surroundings, causing the surrounding temperature to drop.
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