John rode 3150 m at an average speed of 350 m/min.If he had ridden at average of 375 m/min instead. How much sooner would it hav
1 answer:
Explanation:
Given that:
Distance traveled = 3150m
Average speed = 350m/min
Suggested speed = 375m/min
Unknown:
Time = ?
Solution:
Speed is the rate of change of distance with time.
it is mathematically expressed as;
speed =
Initial time using speed 350m/min can be calculated by making time the subject of the formula;
time taken =
time taken at speed of speed of 350m/min = = 9min
to seconds = 9 x 60 = 540 seconds
time taken at speed of 375m/min = = 8.4min
to seconds = 8.4 x 60 = 504 seconds.
It could have taken 504 seconds sooner saving 36 seconds.
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Explanation:
C: ΔH=+178 kJ/mol
For an endothermic reaction, heat is getting absorbed during a chemical reaction and is written on the reactant side.
Any change in the equilibrium is studied on the basis of Le-Chatelier's principle. This principle states that if there is any change in the variables of the reaction, the equilibrium will shift in the direction to minimize the effect.
Treat heat as a reactant and on increasing a reactant at equilibrium, shifts the reaction in the forward direction.
Increase temperature → increase in heat → forward direction
Decrease temperature → decease in heat → backward direction
System C - Increase temperature : Reaction will move forward
System C - Decrease temperature : Reaction will move backward
D: ΔH=−88 kJ/mol
The total enthalpy of the reaction comes out to be negative .
The temperature of the surrounding will increase.
For an exothermic reaction, heat is released during a chemical reaction and is written on the product side.
Any change in the equilibrium is studied on the basis of Le-Chatelier's principle. This principle states that if there is any change in the variables of the reaction, the equilibrium will shift in the direction to minimize the effect.
Treat heat as a product and on increasing a product at equilibrium, shifts the reaction in the backward direction.
Increase temperature → increase in heat → backward direction
Decrease temperature → decease in heat → forward direction
System D - Increase temperature : Reaction will move backward
System D - Decrease temperature : Reaction will move forward