1) What does the graph represent?(Select the correct answer below)
a. Endothermic reaction b. Exothermic reaction Products 2) How do Endothermic reactions feel when they are touched? (Select the correct answer a. Hot b. Cold 3) What is the name of that specific science that studies heat changes and phase changes in chemical reactions? (select the correct answer) a. Thermochemistry b. Climate Change c. Conductivity d. Electromagnetism 4) Select or Highlight the letter in which chemical reactions release energy and the H reaction is negative A) Specific Heat C) Endothermic Reaction
The Correct Answer and Explanation is :
1) The graph represents b. Exothermic reaction.
Explanation: In an exothermic reaction, energy is released as the products have lower energy than the reactants. The graph typically shows a decrease in energy as the reaction progresses, with the products being at a lower energy level than the reactants. This drop in energy is what is shown on the graph, indicating an exothermic reaction.
2) Endothermic reactions feel b. Cold when touched.
Explanation: In an endothermic reaction, energy is absorbed from the surroundings, which means the surroundings (and anything in contact with the reaction) will feel cooler. This absorption of energy comes from the surrounding environment, making it feel cold. An example of an endothermic process is the melting of ice.
3) The science that studies heat changes and phase changes in chemical reactions is a. Thermochemistry.
Explanation: Thermochemistry is a branch of chemistry that focuses on the heat energy changes that occur during chemical reactions and phase transitions. It studies both the heat released or absorbed and the energy changes associated with chemical bonds during reactions. Thermochemistry helps to understand processes such as combustion, freezing, and boiling.
4) Chemical reactions that release energy and where the enthalpy change (ΔH) is negative are C) Exothermic Reactions.
Explanation: Exothermic reactions are those in which energy is released into the surroundings, typically as heat or light. The enthalpy change (ΔH) is negative because the products have less energy than the reactants, indicating a release of energy. This is in contrast to endothermic reactions, where the enthalpy change is positive and energy is absorbed.
In conclusion, exothermic reactions release energy, and the temperature around them decreases during endothermic reactions. Thermochemistry, as a science, studies these energy exchanges in detail.