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nexus9112 [7]
3 years ago
6

Astatine belongs to which element group: nonmetal, halogen, noble gas?

Chemistry
1 answer:
Mkey [24]3 years ago
8 0

Answer:

halogen

Explanation:

It belongs to Group 17 on the periodic table, which is a halogen

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If 40.0 mL of a calcium nitrate solution reacts with excess potassium carbonate to yield 0.524 grams of a precipitate, what is t
tankabanditka [31]

Answer : The molarity of calcium ion on the original solution is, 0.131 M

Explanation :

The balanced chemical reaction is:

Ca(NO_3)_2+K_2CO_3\rightarrow CaCO_3+3KNO_3

When calcium nitrate react with potassium carbonate to give calcium carbonate as a precipitate and potassium nitrate.

First we have to calculate the moles of CaCO_3

\text{Moles of }CaCO_3=\frac{\text{Mass of }CaCO_3}{\text{Molar mass of }CaCO_3}

Given:

Mass of CaCO_3 = 0.524 g

Molar mass of CaCO_3 = 100 g/mol

\text{Moles of }CaCO_3=\frac{0.524}{100g/mol}=0.00524mol

Now we have to calculate the concentration of CaCO_3

\text{Concentration of }CaCO_3=\frac{\text{Moles of }CaCO_3}{\text{Volume of solution}}=\frac{0.00524mol}{0.040L}=0.131M

Now we have to calculate the concentration of calcium ion.

As, calcium carbonate dissociate to give calcium ion and carbonate ion.

CaCO_3\rightarrow Ca^{2+}+CO_3^{2-}

So,

Concentration of calcium ion = Concentration of CaCO_3 = 0.131 M

Thus, the concentration or molarity of calcium ion on the original solution is, 0.131 M

4 0
3 years ago
Fill in the blanks and correct anything that you think is wrong. Please?
kap26 [50]

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Which of the following is the chemical formula for Hydrogen Chloride?
anygoal [31]

Answer:

The answer is (b) HCl

Explanation:

6 0
3 years ago
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1. Define anthracite.<br>​
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Answer:

a hard natural coal of high luster differing from bituminous coal in containing little volatile matter and in burning very cleanly is called anthracite  . called also hard coal

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Answer from Gauth math

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Heyo, I believe that the answer would be D. The valence electrons are given up by the K and gained by the F.
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