Exothermic and Endothermic Reactions
Chemistry ⇒ Chemical Reactions and Equations
Exothermic and Endothermic Reactions starts at 8 and continues till grade 12.
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See sample questions for grade 9
A student mixes hydrochloric acid and sodium hydroxide in a beaker and observes the temperature rises. What type of reaction is this?
A student observes that when ammonium nitrate is dissolved in water, the beaker feels cold. What type of reaction is this?
Describe the energy profile diagram of an exothermic reaction.
Describe what happens to the energy of the system and the surroundings during an endothermic reaction.
Describe what happens to the temperature of the surroundings during an exothermic reaction.
Explain the difference between exothermic and endothermic reactions in terms of energy changes.
Explain why photosynthesis is considered an endothermic reaction.
Explain why the temperature of the surroundings decreases during an endothermic reaction.
Is the process of neutralization between an acid and a base exothermic or endothermic?
Is the process of photosynthesis exothermic or endothermic?
A chemical reaction has an enthalpy change (ΔH) of -150 kJ/mol. Is this reaction exothermic or endothermic? Explain your reasoning.
A reaction absorbs 80 kJ of energy from the surroundings. What is the sign of ΔH for this reaction, and what type of reaction is it?
Consider the following scenario: A student adds calcium chloride to water and observes that the temperature of the solution increases from 20°C to 35°C. What does this observation indicate about the type of reaction, and what is the direction of energy flow?
Describe how you could experimentally determine whether a chemical reaction is exothermic or endothermic.
Explain, with reference to bond energies, why some reactions are endothermic while others are exothermic.
