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-Dominant- [34]
3 years ago
12

Which of these elements would be assigned the highest electronegativity value? Br K Si Ba

Chemistry
1 answer:
Mashutka [201]3 years ago
7 0
It's between br and si so id go with br
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Which of the three kinds of radiation is dangerous to us and why?
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There is alpha, beta, and gamma radiation. Gamma radiation can damage our tissue and DNA. Alpha and Beta can deflected but even gamma radiation can somewhat pass through concrete. 
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NEED HELP ASAP!!!! 7th grade Science!!!
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Sodium phosphate is added to a solution that contains 0.0070 M aluminum nitrate and 0.052 M calcium chloride. The concentration
boyakko [2]

Answer:

The answer to the question is;

The first ion to precipitate out is the Al³⁺ ion and the concentration of the Al³⁺ ion when the Ca²⁺ ion begins to precipitate is 1.12 × 10⁻⁵ M.

Explanation:

To solve the question, we note that

aluminum nitrate, Al(NO₃)₃ will dissociate as follows

Al(NO₃)₃ → Al³⁺ (aq) + 3NO₃⁻ (aq)

Therefore when sodium phosphate is added to a solution that contains aluminum nitrate  we have the following system  of aluminium phosphate which is

AlPO₄(s) ⇄ Al³⁺(aq) + PO₄³⁻(aq)

The solubility product for the above reaction is

Ksp = [Al³⁺][PO₄³⁻] = 9.84×10⁻²¹

The solubility product for calcium phosphate is expressed as

Ca₃(PO₄)₂(s) ⇄ 3 Ca²⁺(aq) + 2 PO₄³⁻(aq)

With Ksp =  [Ca²⁺]³[PO₄³⁻]² = 2.07×10⁻³³

From the solubility product, we can find the concentration of [PO₄³⁻] at which precipitation starts as follows

The phosphate concretion for Al³⁺ when precipitation starts is

[PO₄³⁻] = \frac{K_{sp}}{[Al^{3+}]}= 9.84×10⁻²¹ / 0.007 = 1.406×10⁻¹⁸ M

The phosphate concretion for Ca²⁺ when precipitation starts is

[PO₄³⁻] =\sqrt{\frac{K_{sp}}{[Ca^{2+}]^2}}  = \sqrt{\frac{2.07\times10^{-33}}{[0.052]^2}} = 8.75×10⁻¹⁶ M

(Aluminium phosphate precipitates out first)

The reaction favors the precipitation of the aluminum phosphate first due to the lower concentration of the [PO₄³⁻]  ions in the [Al³⁺][PO₄³⁻] system which  is lower than the relative [PO₄³⁻] in the [Ca²⁺]³[PO₄³⁻]².

Therefore, the more sodium phosphate added serves to precipitate the remaining aluminium phosphate.

The process continues and the concentration of Al³⁺ decreases as more precipitates form. The process continues until the equilibrium conditions satisfies the precipitation threshold level for the calcium phosphate system concentration whereby the concentration of the Al³⁺ in the solution is given by.

[Al³⁺] = \frac{K_{sp}}{[PO_4^{3-}]} = \frac{9.84\times 10^{-21}}{8.75\times 10^{-16}}  = 1.12 × 10⁻⁵ M

Therefore the concentration of this aluminium ion when the calcium ion begins to precipitate =  1.12 × 10⁻⁵ M.

8 0
3 years ago
Fill in the chart with the following words:
Anna [14]

Answer:

                      Energy

potential energy        kinetic energy

chemical energy         thermal energy

                                                                   joules

Explanation:

chemical energy is a type of potential energy or stored energy. Heat is a kinetic energy and energy is measured in joules.

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