Answer:
The atomic weight of an element represents the ratio of the average mass of atoms of a chemical element.
Answer:
Explanation:
Potential energy builds as the coaster is going up the loop-the-loop and converts to kinetic energy on the way down and out of the loop-the-loop. The potential energy of the coaster is at its lowest and the kinetic energy is at its highest as the coaster moves in the lowest point of the loop-the- loop.
Answer:
I think is the last one.
Anthracite – Stage Four
Anthracite, the fourth stage in coal formation, is also known as “hard coal” because it is hard and has a high lustre. It appears to have been formed as a result of combined pressure and high temperature. Anthracite burns with a short flame and little smoke.
Answer:
b) 99 kPa
Explanation:
According to Daltons law of partial pressure, the total pressure of a mixture of two or more non reactive gases is the sum of their individual pressures. Let the total pressure of a mixture of n number of gases be 
and their individual pressure be 
, According to Daltons partial pressure law:
Since A glass cylinder contains 2 gases at a pressure of 106 kPa, therefore n = 2. Also one gas (
) is at 7 kPa. Using Daltons partial pressure law:
