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Chem Week 12
Chemical Thermodynamics
Grade Level:
10
Subject:
Chemistry
Topic:
Chemical Thermodynamics
Objective:
Explain the law of conservation of energy.
Contrast exothermic with endothermic processes.
Use calories and joules to calculate heat flow in chemical reactions.
Define enthalpy and its use in understanding energy relationships in chemical reactions.
Apply Hess's law to determine the heat of a reaction.
Other Information:
Unit: Chemical Thermodynamics
In this unit, students will learn the concepts of thermal energy, heat, enthalpy, specific heat capacity, and energy changes during chemical reactions. They will learn about the laws of thermodynamics and how to apply these laws to calculate the energies given off or absorbed during various chemical reactions. They will also learn how to use these laws to predict chemical reactions.
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Prep:
Read 4.10
Materials:
Number of Questions: 5
Points Possible: 5
1) Your car burns gasoline with air to make heat. Where does most of this energy come from?
air
spark plugs
chemical bonds of the gasoline
energy stored in the pistons of the engine
2) Which of the following is an exothermic reaction?
ammonium nitrate dissolving in water
ammonium chloride dissolving in water
sugar dissolving in water
concentrated hydrochloric acid dissolving in water
3) Which of the following statements is true in all cases?
Chemical bonds are broken in an exothermic reaction.
Chemical bonds are formed in an endothermic reaction.
Energy is released in an endothermic reaction.
Energy is absorbed in an endothermic reaction.
4) Which of the following is an endothermic reaction?
a liquid changing to a gas
sodium chloride dissolving in water
sugar dissolving in water
strong hydrochloric acid dissolving in water
5) Melting ice is an example of which of the following?
endothermic reaction
exothermic reaction
isothermic reaction
chemical reaction
