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Alja [10]
3 years ago
14

PLEASEEEE HELP MEEEEE

Chemistry
2 answers:
KIM [24]3 years ago
5 0

Answer:

Transporting oxygen-rich blood to the body .

Explanation:

I hope it helps

Natasha_Volkova [10]3 years ago
4 0
A.movement and protection
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When one atom contributes both bonding electrons in a single covalent bond, the bond is called a(n) ____?
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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.

8 0
2 years ago
Good Morning I have a question I need help and can not find the answer o it maybe someone help me? The question is _______ Most
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Answer:

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3 years ago
A major difference between deep ocean currents and surface currents is that deep ocean currents _____.
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8 0
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An element has three naturally occurring isotopes. ten percent (.10) occurs as 55^x, fifteen percent (.15) occurs as isotope 56^
Leviafan [203]
The average atomic weight is, from the name itself, the average weight of all its naturally occurring isotopes. All you have to do is multiple the abundance of each isotope with its individual mass, then add them altogether.

Mass = (0.10*55)+(0.15*56)+(.75*57)
<em>Mass = 56.65 amu</em>
5 0
3 years ago
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