A. An endothermic reaction i taking place in a test tube. What would you expect to feel when you touch the outside of the test t
ube?
b. Identify each of the following changes as either exothermic or endothermic.
- Burning a candle
- Lighting a gas stove
- Using an instant cold pack
- Running a car's engine
c. On the potential energy diagram below, label the reactants and products. Does the diagram shown an endothermic reaction or an exothermic reaction? Write one or two sentences explaining your answer.
b. Identify each of the following changes as either exothermic or endothermic.
- Burning a candle
- Lighting a gas stove
- Using an instant cold pack
- Running a car's engine
c. On the potential energy diagram below, label the reactants and products. Does the diagram shown an endothermic reaction or an exothermic reaction? Write one or two sentences explaining your answer.
2 answers:
Explanation:
An endothermic reaction is a type of of chemical reaction in which energy is absorbed from the surrounding. The temperature of the surrounding decreases.
An Exothermic reaction is a type of of chemical reaction in which energy is released into the surrounding. The temperature of the surrounding increases.
a)When an endothermic reaction takes place in test tube the temperature of the surrounding(here the outside wall of the test tube) will decrease which can be felt by touching the outside of the test tube.
b) Burning a candle
,Lighting a gas stove and running a car's engine all are example of exothermic reaction because energy is releases into surroundings. Where as using an instant cold pack is an example endothermic reaction in which energy is absorbed from the surrounding.
c) The diagram is of an exothermic reaction because the energy of the reactants is higher than the energy of the products.The difference in the energies of these two is the energy which was being released on completion of reaction.
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1. The bowling ball have more potential energy as it sit on top of the building
2.The bowling ball have same potential energy and kinetic energy as it is half way through its fall
3. The bowling ball have more kinetic energy just before it hits the ground
4. The potential energy of the bowling ball as it sits on top of the building is 784J
5. The potential energy of the ball as it is half way through the fall, 20 meters high is 392J
6. The kinetic energy of the ball as it is half way through the fall is 392J
7. The kinetic energy of the ball just before it hits the ground is 784J
Explanation:
Calculating potential energy and kinetic energy for all the instances,
1. ball on top of a 40 meters tall building
Potential energy at the top of building with a height of 40m = mgh
P.E = mgh =2*9.8*40= 784J
At the top pf the building since v=0 kinetic energy is zero
2. half way through a fall off a building that is 40 meters tall and travelling 19.8 meters per second
Potential energy when it is half way through fall = mgH
where H represents new height that is equal to 20m
hence P.E=mgH=2*9.8*20= 392J
Kinetic energy of the ball is =392.04J
3. Just about to hit the ground from a fall off a building that is 40 meters tall and travelling 28 meters per second.
The potential energy of ball just before it hits the ground = mgh= 2*9.8*0=0J
kinetic energy == 784J
