Chemical Reactions and Energy Study GuideName: ______
7th Grade PSI
Answer the following questions below:
1)What role do observations play in determining if a change has occurred?
2)What are your five senses? Give an example of an observation you could make with each.
3)In addition to your five senses, why are toolsimportant for making observations? Explain using examples.
4)What is the difference between a physical change and a chemical reaction? Give an example of each.
5)What are the names of the six phase changes? Indicate a starting and ending phase for each.
6)What are common signals that a chemical reaction has occurred?
7)Describe what happens to atoms during a chemical reaction.
8)Explain the concepts of Conservation of Mass and Conservation of Matter.Describe an example that illustrates each.
9)What is a balanced chemical equation?
10)Use the element chart to balance the following chemical equation:
CH4 + 2O2 CO2 + H2O
11)List at least seven types of energy we discussed and explain what each is. Provide an example of each.
12)How are food calories related to energy?
13)What is Conservation of Energy?
14)What is the difference between an endothermic reaction and an exothermic reaction? Give two examples of each.
15)What is an energy diagram for a chemical reaction and what does it show?
16)Draw an energy diagram:
- for an endothermic reaction.
- for an exothermic reaction.
- Explain the differences in the two diagrams.
17)What is the difference between thermal energy and temperature?
18)What factors influence thermal energy?
19)Explain when and how energy flows between two objects that start at different temperatures.
20)How do phase changes help show the difference between thermal energy and temperature?
Grade PSIChemical Reactions and Energy