Answer:
Explanation:
Heat involved Q = mcΔt where m is mass , c is specific heat of water and Δt is rise in temperature
= 150 x 4.18 x 25.8 J .
= 16176.6 J .
As the temperature rises , the reaction is exothermic.
Clean Water Act
Explanation:
The Clean Water Act in 1972 was a set of laws signed by former President Nixon that helps to keep water clean in the United States.
- The act sets a safe limit for the amount and kind of pollutants that can be released into the water that won't contaminate it.
- The acts charged the Environmental Protection Agency(EPA) to set a safe limit for nature and amount of pollutants that can be released into the water.
- This act is one of the several environmental polices in the United States that ensures a safe drinking water is available.
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The correct answer is Hydroelectric (D)
No why are you asking this question?
<u>Answer:</u> The fraction of the rock that is still composed of potassium-40 is 0.25
<u>Explanation:</u>
To calculate the fraction of the rock that is still composed of K-40, we use the formula:

where,
a = amount of reactant left after n-half lives
= Initial amount of the reactant
n = number of half lives = 2
Putting values in above equation, we get:

Hence, the fraction of the rock that is still composed of potassium-40 is 0.25