Answer:
13,3875 minutes or 2,231.25 hours
Explanation:
153 x 25 = 3,825
person x lab paper = all the lab papers turned in.
35 x 3,825 = 13,3875
minutes x all the lab papers turned in = amount of minutes spent on grading
Answer:
C. As the temperature increases, the speed of gas molecules increases.
Explanation:
one of the main 4 postulates of kinetic theory of gases is the relationship between the speed and temperature of gas molecules.
The speed of the molecules in a gas is proportional to the temperature and is inversely proportional to molar mass of the gas. In other words, as the temperature of a sample of gas is increased, the molecules speed up and the root mean square molecular speed increases as a result.
So, the right choice is:
C. As the temperature increases, the speed of gas molecules increases.
Answer:
C . ns²np²
Explanation:
According to this configuration the outermost orbit has 2 electrons in p and 2 electrons in s . After first ionization from p orbital involving energy E₁ , second ionisation from p is possible with E₂ energy . E₂ will be greater than E₁ .
But after second ionisation , there is no electron in p orbital . Hence the third ionisation is possible when we extract electron from s orbital . The difference in the ionisation energy of s and p is quite large . Hence third ionisation will involve much greater energy .
Hence third ionisation energy will be much larger than the second ionisation energy or
E₃ >>> E₂ .
Hence option ( C ) is correct .
Answer:
It breaks down in mathematically exponential way.
Explanation:
For example if you have 100 grams, after the first decay, its 50. Then 25. Then 12.5, and so on. Rather than, say, 5 grams being subtracted every cycle, it is dilated by the factor of a fraction, making it exponential.
<span>Well it depends on percentage by what, but I'll just assume that it's percentage by mass.
For this, we look at the atomic masses of the elements present in the compound.
Cu has an atomic mass of 63.546 amu
Fe has 55.845 amu
and S has 36.065 amu
Since there are 2 molecules of Sulfur for each one of Cu and Fe, we'll multiply the Sulfur atomic weight by 2 to obtain 72.13 amu
So we have not established the mass of the compound in amus
63.546 + 55.845 + 72.13 = 191.521
That is the atomic mass of Chalcopyrite. and Iron's atomic mass is 55.845
So to get the percentage, or fraction of iron, we take 55.845 / 191.521
Which comes out to 29.15% by mass
Mass of the sample is not needed for this calculation, but since the question mentions it I would go ahead and check if the question isn't also asking for the mass of Iron in the sample as well, in which case you just find the 29.15% of 67.7g</span>
