1. Potential Energy is stored energy a object has when it's not moving.
2. Potential Energy is it's highest on the first stage because as you see the roller coaster is bout to go down the tract which is going to higher the kinetic energy and lower the potential energy.
3. Kinetic Energy is the amount of energy a object has when it's in motion or moving.
4. Kinetic Energy is it's highest in the third stage after it's gone down the tract and potential energy fully decreased and it's at zero.
Remember that potential energy is stored energy so when a object is not moving in this case the roller coaster isn't moving on the first stage when its bout to go down the roller coaster. Kinetic energy is the amount of energy a object has when it's in motion so in this case the third stage would have the highest example of Kinetic energy because it's fully in motion and has no potential energy.
the heat of reaction for a chemical reaction
<span>The standard temperature and pressure is 273.15 K and 1 atm. We use the
ideal gas equation to solve this problem to find for the amount of gas in moles.
PV = nRT
n = PV / RT = 5100 mmHg x 20.1 L / </span>62.364<span> x 302.15
n = 5.44 mol
At STP,
V = nRT / P = </span><span>5.44 mol x</span> 62.364 x 273.15 / 760
V = 121.94 L<span>
</span>
Let us consider each statement one by one
a) Catalysts are the substance which alter the reaction pathway where activation energy of reaction is less that the un catalyzed reaction. They are not used up in the reaction . the catalyst is restored in the reaction.
b) As mentioned above, the catalyst speed up reaction by lowering the activation energy
c) During a reaction the reactants are consumed up and products are formed. so there is a decrease in concentration of reactant.
Thus all the above statements are true.
D) the rate of decrease in concentration of reactants depends upon the coefficient of reactant in balanced chemical reaction.
For example
Here the rate of decrease in concentration of hydrogen will be double the rate of decrease in concentration of oxygen.
