Question

endothermic
a reaction in which energy is absorbed by reactants
exothermic
a reaction in which energy is released by reactants
endothermic reactions: reactants have
energy than the products.
exothermic reactions: reactants have
energy than the products.
think - pair - share & practice
in a laboratory, a student combines vinegar and baking soda into a beaker. the initial temperature is 28°c and the final temperature, 2 minutes later, is 20°c.

• what happened to the heat in the surroundings?
• did an endothermic or exothermic reaction occur?
• is this energy diagram representing an endothermic or exothermic reactions? explain!

nearpod quiz score: _/5

Explanation:

Step1: Understand endothermic and exothermic

Endothermic reactions absorb heat from surroundings, exothermic release heat to surroundings.

Step2: Analyze temperature change

Initial temp is 28°C, final is 20°C. Temperature decreased.

Step3: Determine heat flow

Since temp decreased, heat was absorbed by the reaction from the surroundings. So it's an endothermic reaction.

Step4: Analyze energy - diagram

For an endothermic reaction, reactants have less energy than products. For an exothermic reaction, reactants have more energy than products. If the energy of reactants is lower than that of products in the given energy - diagram, it represents an endothermic reaction; if the energy of reactants is higher than that of products, it represents an exothermic reaction.

Answer:

• What happened to the heat in the surroundings? Heat was absorbed by the reaction from the surroundings.
• Did an endothermic or exothermic reaction occur? An endothermic reaction occurred.
• Is this energy diagram representing an endothermic or exothermic reaction? If reactants have lower energy than products in the diagram, it's endothermic; if reactants have higher energy than products, it's exothermic.