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3 years ago

Calcium + sulfuric acid =

Chemistry

2 answers:

Ksenya-84 [330]3 years ago

8 0

Answer:

The reaction between calcium and sulphuric acid produces calcium sulphate, a salt and hydrogen gas. It is a single displacement reaction.* Calcium is a metal.* Sulfuric acid as the name suggests is an acid.

Hope I could be of service

Pie3 years ago

7 0

Answer:

Calcium metal will react with sulfuric acid to produce calcium sulfate solution, and hydrogen gas.

Please let me know if I'm wrong.

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At a wastewater treatment plant, FeCl3(s) is added to remove excess phosphate from the effluent. Assume the following reactions

RoseWind [281]

Answer : The concentration of $Fe^{3+}$ needed is, $2.37\times 10^4M$

Explanation :

First we have to calculate the mole of phosphate.

As we are given that, 1 mg P/L that means, 1 mg of phosphate present in 1 L of solution.

$\text{Moles of phosphate}=\frac{\text{Mass of phosphate}}{\text{Molar mass of phosphate}}$

Molar mass of phosphate = 94.97 g/mole

$\text{Moles of phosphate}=\frac{1mg}{94.97g/mol}=\frac{0.001g}{94.97g/mol}=1.053\times 10^{-5}mol$

Now we have to calculate the concentration of phosphate.

$\text{Concentration of phosphate}=\frac{\text{Moles of phosphate}}{\text{Volume of solution}}$

$\text{Concentration of phosphate}=\frac{1.053\times 10^{-5}mol}{1L}=1.053\times 10^{-5}mol/L$

Now we have to calculate the concentration of $Fe^{3+}$ .

The second equilibrium reaction is,

$FePO_4\rightleftharpoons Fe^{3+}+PO_4^{3-}$

The solubility constant expression for this reaction is:

$K_{sp}=[Fe^{3+}][PO_4^{3-}]$

Given: $K_{sp}=\frac{1}{4}$

$\frac{1}{4}=[Fe^{3+}]\times 1.053\times 10^{-5}mol/L$

$[Fe^{3+}]=2.37\times 10^4M$

Thus, the concentration of $Fe^{3+}$ needed is, $2.37\times 10^4M$

8 0

4 years ago

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Alina [70]

Answer:C

Explanation:

3 0

3 years ago

Please help me answer this first question.

Strike441 [17]

Answer:

I think it would be 9 moles.

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3 years ago

How have chemists changed the periodic table over time?

mrs_skeptik [129]

They have used added new elements to the table .

<u>Explanation:</u>

As new elements are discovered chemists add them to the period table leading to the periodic table undergoing continuous modifications. When the first periodic table in the world was formed, very few elements were known to humankind. Earlier periodic tables thus contain lesser number of elements than the modern ones.

Mendeleev's periodic table contained 63 elements arranged in the increasing order of their atomic masses. Modern periodic tables have far more number then the older ones like that of Mendeleev's and the elements are arranged in the order of their atomic numbers.

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3 years ago

Which of the following atoms is most able to attract electrons? Group of answer choices

Ket [755]

F - Fluorine

Explanation:

Fluorine is the atom that is most able to attract electrons to itself among the choices. The ability of an atom to attract electron to itself is called electronegativity.

Electronegativity is a measure of the relative tendency with which atoms of an element attracts valence electrons in a chemical bond.
Fluorine is the most electronegative element on the periodic table.
According to Pauling's table on electronegativities of elements, it has a value of 4.0.
This is the highest on the periodic table of elements.

Learn more:

Electronegativity brainly.com/question/7007192

#learnwithBrainly

8 0

3 years ago

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