What do you think will happen to the ecosystem if all the coral reefs are destroyed?

Answers

Answer 1

Answer: Animals that rely on coral for protection and cover, such as grouper, snapper, oysters and clams, would also be negatively impacted. And because this marine life is a vital staple in many peoples' diets, the death of the coral reefs would exacerbate the problem of feeding these groups [source: Skoloff].

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A hypothetical element consists of 3 isotopeswith the following masses and natural abundances.
Isotopic Natural
Mass Abundance
Number %
1 39 78.8
2 40 18.1
3 41 3.1
what is the atomic weight

Answers

To calculate the average atomic weight, each exact atomic weight is multiplied by its percent abundance (expressed as a decimal). Then, add the results together and round off to an appropriate number of significant figures

39 x .788 = 30.732
40 x .181 = 5.43
41 x .031 =+ 1.24
----------
39 since there are only 2 significant figures given for each mass

Final answer:

The atomic weight of a hypothetical element with isotopes of masses 39, 40, and 41 and natural abundances of 78.8%, 18.1%, and 3.1% respectively, is approximately 39.243 atomic mass units (amu).

Explanation:

To calculate the atomic weight of an element from its isotopes' masses and abundances, use the formula: atomic weight = (mass1 x abundance1) + (mass2 x abundance2) + ... (massn x abundancen), where the masses are the isotopes' masses and the abundances are given as proportions (i.e., percentages divided by 100).

Using the values from your question, the calculation would be as follows:

Atomic weight = (39 x 0.788) + (40 x 0.181) + (41 x 0.031) = 30.732 + 7.24 + 1.271 = 39.243. So, the atomic weight of the hypothetical element is approximately 39.243 atomic mass units (amu).

Learn more about Atomic Weight here:

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When [OH-] changes from 10-9 to 10-11 in a solution: Kw = [H+][OH-]

What is the [H+] after the change?

Answers

According to the fact that [H+]*[OH-] is always equal Kw $= 1x10^(-14)$ , you can easily find concentration of [H+] by changing from $1*10^(-9)$ to $1*10^(-11)$
H increases, Kw is constant, therefore $10^-14 / 10^-11 = 10^-3.$
And you will have $Hence [H+] = 10^-3$ where pH is 3

Answer:

Explanation:

The light intensity of a source is 100 candelas. The illuminance on a surface is 4 lux. How far is the surface from the source?

Answers

The answer is 5 meters.

The illuminance on a surface (E) is equal to the light intensity (I) divided by the square distance from the light source (d):
E = I ÷ d² [=] candela/ square meters = lux.
The unit of the illuminance is lux.

So, it is given:
E = 4 lux
I = 100 candelas
d = ?

If:
E = I ÷ d²
Then
d² = I ÷ E
⇒ d² = 100 ÷ 4
⇒ d² = 25

If we put both sides of the equation under the square root, then:
√d² = √25
⇒ d = 5 meters.

Therefore, the surface is 5 meters far from the light source.

What is the golden rule of solubility?

Answers

like disolves like is the golden rule

Like dissolves like I believe

The three-dimensional structure of macromolecules is formed and maintained primarily through noncovalent interactions. Which one of the following is not considered a noncovalent interaction?A) carbon-carbon bondsB) hydrogen bondsC) hydrophobic interactionsD) ionic interactions

Answers

Answer:

The correct answer is A) carbon-carbon bonds.

Explanation:

The noncovalent interactions can generally be classified into electrostatic, π interactions, Van der Waals forces, and hydrophobic interactions. They do not share electrons, but present more dispersed variations of electromagnetic interactions between molecules or within the same molecule.

In a carbon-carbon bond, there is a covalent bond between two atoms in an organic compound. The most common form is the simple bond, which is composed of two electrons, one belonging to each of the two atoms. The simple carbon-carbon bond is a sigma bond.

Have a nice day!

Answer:

The correct option is A

Explanation:

Non-covalent interactions, from the name, means interactions that do not involve covalent interaction. Covalent interaction involves the sharing of electrons between two atoms. The bond between two carbons in organic compounds is covalent bond. The covalent interaction in itself does not permit for three-dimensional structure. Examples of noncovalent interaction include hydrogen bonds, ionic interactions, van der waals interactions and hydrogen bonds

Which of the following processes is not regarded as contributing to the creation of greenhouse gases

Answers

If this question has the same list of choices like the previous ones, the answer would be: creating electricity from wind
Creating electricity from wind is not regarded as contributing to the creation of greenhouse gases.

choices are:
deforestation
creating electricity from coal
creating electricity from wind
use of fertilizers

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