Answer:
Some hydrocarbons are gases because the molecules are small structure and there interaction less among each other, while some hydrocarbons are liquids because the molecules are big structures and there interaction more with each other and they tend to settle in liquid state.
Explanation:
Answer:
Remove the && and create a nested if statement.
Explanation:
The statement ((average > 79 && average <= 89)) states a condition that the value of average is supposed to be greater than 79 and less than equals to 89. Since AND (&&) operator is being used between both the expressions so both should be true to make the condition evaluate to true. This means that value of average variable is greater than 79 AND less than or equal to 89.
Now the logical operator && can be eliminated by using nested-if statement which refers to the if statement inside another if statement. So the above statement can be written as:
if (average>79)
{
if (average<=89)
}
It will check firstly the average value for being greater than 79 (if average value is greater than 79? ) AND then check average value to see if that less than or equal to 89.
Usually in nested if statement there is an else part at the end which is executed in case all the if conditions evaluates to false.
It will be written like this:
if (average>79)
{ if (average<=89)
{ /*some block of the code to be executed in case the above two if conditions evaluate to true */ } }
else
{ //executed if both the above if conditions evaluate to false.}
The Answer would be C. Without plants in the ecosystem, it could not feed. Plants are mainly the only producers that feed 3rd level consumers which feed 2nd level consumers which feed 1st level consumers.
<u>Answer:</u> The Cu-63 isotope has the highest percent natural abundance
<u>Explanation:</u>
Average atomic mass is defined as the sum of masses of each isotope each multiplied by their natural fractional abundance.
Formula used to calculate average atomic mass follows:
![\text{Average atomic mass }=\sum_{i=1}^n\text{(Atomic mass of an isotopes)}_i\times \text{(Fractional abundance})_i](https://tex.z-dn.net/?f=%5Ctext%7BAverage%20atomic%20mass%20%7D%3D%5Csum_%7Bi%3D1%7D%5En%5Ctext%7B%28Atomic%20mass%20of%20an%20isotopes%29%7D_i%5Ctimes%20%5Ctext%7B%28Fractional%20abundance%7D%29_i)
We are given:
Two isotopes of Copper, which are Cu-63 and Cu-65
Average atomic mass of copper = 63.54 amu
As, the average atomic mass of copper is closer to the mass of Cu-63 isotope. This means that the relative abundance of this isotope is the highest as compared to the other isotope.
Percentage abundance of Cu-63 isotope = 69.2%
Percentage abundance of Cu-65 isotope = 30.8 %
Hence, the Cu-63 isotope has the highest percent natural abundance
Answer: The answer is either A or C. I'm leaning more towards A.