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 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.
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?
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?
Which of the following best describes an exothermic reaction?
(1) Energy is absorbed from the surroundings
(2) Energy is released to the surroundings
(3) No energy change occurs
(4) Energy is stored in the products
Which of the following is an endothermic process?
(1) Freezing
(2) Boiling
(3) Condensation
(4) Combustion
Which of the following is an example of an endothermic reaction?
(1) Neutralization
(2) Combustion
(3) Photosynthesis
(4) Respiration
Which of the following is an example of an exothermic reaction?
(1) Decomposition of calcium carbonate
(2) Burning of natural gas
(3) Photosynthesis
(4) Melting of ice
Fill in the blank: In an endothermic reaction, the enthalpy change (ΔH) is __________.
Fill in the blank: In an endothermic reaction, the products have __________ energy than the reactants.
Fill in the blank: In an exothermic reaction, the enthalpy change (ΔH) is __________.
Fill in the blank: In an exothermic reaction, the temperature of the surroundings usually __________.
Is the process of respiration exothermic?
Is the reaction of hydrogen and oxygen to form water exothermic?
Is the reaction of quicklime (CaO) with water to form slaked lime (Ca(OH)2) exothermic?
State whether the following statement is true or false: All chemical reactions release heat.
