3 years ago

How much percent of energy presents at one level is available to the next trophic level

1 answer:

4 0

When a herbivore gets eaten by a carnivore, only 10% of energy gets transferred to the next trophic level.

This explains why food chains cannot go on indefinitely.

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How many molecules of oxygen are produced when a sample of 38.9 g of water is decomposed by electricity?

statuscvo [17]

Answer:

A) $6.5\times 10^{23}\ \text{molecules}$

Explanation:

m = Mass of water = 38.9

M = Molar mass of water = 18 g/mol

$N_A$ = Avogadro's number = $6.022\times 10^{23}\ \text{mol}^{-1}$

The reaction of electrolysis would be

$2H_2O(l)\rightarrow 2H_2(g)+O_2(g)$

Number of moles of $H_2O$

$n=\dfrac{m}{M}\\\Rightarrow n=\dfrac{38.9}{18}\ \text{mol}$

From the reaction it can be seen that 2 moles of $H_2O$ gives 1 mole of $O_2$

So, number of moles of $O_2$ produced is

$\dfrac{38.9}{18}\times \dfrac{1}{2}=1.081\ \text{mol}$

Number of molecules

$1.081N_A=1.081\times 6.022\times 10^{23}\\ =6.5\times 10^{23}$

So, $6.5\times 10^{23}\ \text{molecules}$ of oxygen is produced.

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3 years ago

When the water inside a living cell freezes, the ice crystals damage the cell. The wood frog is a unique creature that can survi

professor190 [17]

But i think its B but i need answer too

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3 years ago

Which of the following statements explains which trial has a lower concentration of the reactant? (5 points) Trial 1, because th

PIT_PIT [208]

Answer:

A)Trial 1 because the average rate of reaction is lower.

Explanation:

I accidentally gave myself low rating my bad

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Which scientist was the first to devise the rules of chemical reactions that are explained by modern atomic theory?

valina [46]

Answer:

John Dalton is the correct answer.

Explanation:

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3 years ago

What are the oxidation numbers of the atoms in this reaction?

ipn [44]

A, B and D should be the ones you should check

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4 years ago