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3 years ago

Why are fewer organisms found as you move up the food chain?

Chemistry

2 answers:

Nina [5.8K]3 years ago

8 0

Are there choices we should be choosing from? Or do you just want an explanation?

olga2289 [7]3 years ago

3 0

Because as you move higher up the food chain there is less prey for predators to eat, which limits the size of the predator population. The populations of predators higher on the food chain are totally dependent on the population of their prey, which are below them on the food chain.

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Iridium has only two naturally occurring isotopes. Ir-191 with arelative mass of 190.96058 and Ir-193 with a relative mass of192

OLEGan [10]

Answer: The fractional abundance of Ir-191 is 0.372

Explanation:

Average atomic mass of an element 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:

$\text{Average atomic mass }=\sum_{i=1}^n\text{(Atomic mass of an isotopes)}_i\times \text{(Fractional abundance})_i$ .....(1)

Let the fractional abundance of Ir-191 be x and that of Ir-193 isotope be (1-x)

For isotope 1 (Ir-191):

Mass of isotope 1 = 190.96058 amu

Fractional abundance of Ir-191 = x

For isotope 1 (Ir-193):

Mass of isotope 1 = 192.96292 amu

Fractional abundance of Ir-193 = (1 - x)

Average atomic mass of iridium = 192.217 amu

Putting values in equation 1, we get:

$192.217=[(190.96058\times x)+(192.96292\times (1-x))]\\\\x=0.372$

Hence, the fractional abundance of Ir-191 is 0.372

6 0

3 years ago

What information does the atominic numer give you about an element

uysha [10]

Answer:

It gives the number of protons in the nucleus of each atom of that element.

Explanation:

6 0

2 years ago

What is Carbons position on the Periodic table?

MrRissso [65]

Carbon is located in the fourth group, second period. It is also in the nonmetal section of the table as well

7 0

3 years ago

You are a chemist working in your laboratory. In your storage closet you have a cabinet that holds only samples of pure elements

Vladimir79 [104]

Answer:

Mercury

Explanation:

While it is true that most metals are solid at room temperature, mercury is liquid at room temperature hence mercury is often designated as the 'liquid metal'.

Thus, if i find a bottle on the shelf that has no solid in it, only liquid and i know that only pure metals are stored in that area of the laboratory, then i will quickly relabel it as mercury.

7 0

3 years ago

1. A rock with a mass of 66.5g occupies 23.0 cm. Density?

telo118 [61]

Answer:

2.89 g/cm^3

Explanation:

Since density equals mass over volume (or also seen as $d=\frac{m}{v}$ ), simply divide 66.5 grams by 23.0 cm. This will output an answer of 2.89 g/cm^3.

7 0

3 years ago