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3 years ago

What role do aquifers play in water cycle

Chemistry

2 answers:

Ahat [919]3 years ago

6 0

Aquifers store water in ground.

Maksim231197 [3]3 years ago

6 0

Answer:

A. they store water in the ground.

Explanation:

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I need help can someone explain this to me

ELEN [110]

A.) top to bottom:
900, 1000, 1200
B.) top to bottom:
250, 450

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3 years ago

A matter with very far apart molecules

Ierofanga [76]

Answer:

The molecules in a gas are very far apart so they can be squeezed together into a smaller space.

4 0

3 years ago

What is the limiting reactant of the chemical reaction Al(OH)3 + H2SO4 —> Al2(SO4)3 + H2O

charle [14.2K]

2 Al(OH)3 + 3 H2So4 = Al2(So4)3 + 6 H2O

Reaction type: double replacement

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3 years ago

Non-metallic properties are more pronounced: 1) Si 2) B 3) O 4)S

Ne4ueva [31]

Answer:

1. Si

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3 years ago

The element boron exists in nature as two isotopes: 10B has a mass of 10.0129 u, and 11B has a mass of 11.0093 u. The average at

Shalnov [3]

Answer:

Percentage abundance of B 10 is = 20 %

Percentage abundance of B 11 is = 80 %

Explanation:

The formula for the calculation of the average atomic mass is:

$Average\ atomic\ mass=(\frac {\%\ of\ the\ first\ isotope}{100}\times {Mass\ of\ the\ first\ isotope})+(\frac {\%\ of\ the\ second\ isotope}{100}\times {Mass\ of\ the\ second\ isotope})$

Given that:

Since the element has only 2 isotopes, so the let the percentage of first be x and the second is 100 -x.

For first isotope, B 10:

% = x %

Mass = 10.0129 u

For second isotope, B 11:

% = 100 - x

Mass = 11.0093 u

Given, Average Mass = 10.81 u

Thus,

$10.81=\frac{x}{100}\times {10.0129}+\frac{100-x}{100}\times {11.0093}$

$10.0129x+11.0093\left(100-x\right)=1081$

Solving for x, we get that:

x = 20 %

Thus percentage abundance of B 10 is = 20 %

Percentage abundance of B 11 is = 100 - 20 % = 80 %

8 0

3 years ago

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