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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A chemical cold pack contains ammonium nitrate and water. When activated, the pack becomes cold. What type of reaction is occurring?
A reaction has ΔH = -200 kJ. Is this reaction exothermic or endothermic?
A student mixes barium hydroxide and ammonium chloride in a beaker. The beaker becomes very cold. What type of reaction is this?
Describe how you would experimentally determine if a reaction is exothermic or endothermic.
A chemical cold pack contains ammonium nitrate and water. When activated, the pack becomes cold. What type of reaction is occurring?
A reaction has ΔH = -200 kJ. Is this reaction exothermic or endothermic?
A student mixes barium hydroxide and ammonium chloride in a beaker. The beaker becomes very cold. What type of reaction is this?
A student dissolves calcium chloride (CaCl2) in water and observes a significant increase in temperature. Explain, in terms of enthalpy change and energy flow, why this occurs.
Which of the following best describes the energy profile of an exothermic reaction?
(1) Products have higher energy than reactants
(2) Reactants have higher energy than products
(3) Both have the same energy
(4) Energy is not involved
Which of the following is an example of an endothermic process?
(1) Freezing of water
(2) Boiling of water
(3) Condensation of steam
(4) Combustion of propane
Which of the following is an exothermic process?
(1) Sublimation of dry ice
(2) Condensation of water vapor
(3) Melting of lead
(4) Decomposition of silver chloride
Which of the following is an exothermic reaction?
(1) Photosynthesis
(2) Combustion of methane
(3) Melting of ice
(4) Electrolysis of water
Fill in the blank: In an endothermic reaction, heat is __________ by the system.
Fill in the blank: In an exothermic reaction, energy is transferred from the __________ to the __________.
Fill in the blank: The combustion of glucose in cellular respiration is an __________ reaction.
Fill in the blank: The enthalpy change (ΔH) for an exothermic reaction is __________.
Is the neutralization reaction between hydrochloric acid and sodium hydroxide exothermic?
True or False: In an endothermic reaction, the products have higher enthalpy than the reactants.
True or False: Photosynthesis is an endothermic reaction.
True or False: The decomposition of water into hydrogen and oxygen by electrolysis is an exothermic reaction.
