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Murljashka [212]
3 years ago
12

39. Which of the following substances are insoluble in water? Select all that apply.

Chemistry
2 answers:
Jet001 [13]3 years ago
7 0
A, B, and C are insoluble in water
Bond [772]3 years ago
5 0

Answer:

B) BaSO₄ and C) Mg₃(PO₄)₂

Explanation:

We can use the solubility rules to decide which substances are insoluble.

You have probably learned NAG SAG and "Cats Cradle Old People," Sally Said.

I've listed them below.

\begin{array}{lll}\textbf{Soluble} & \textbf{Insoluble}\\\textbf{N}\text{itrates} &\textbf{C} \text{arbonates }\\ \textbf{A}\text{cetates} & \textbf{C}\text{hromates}\\ \textbf{G}\text{roup 1} & \textbf{O}\text{ hydrOxides}\\ & \textbf{P} \text{hosphates}\\\textbf{S}\text{ulfates} &\textbf{S} \text{ulfites}\\ \textbf{A}\text{mmonium}& \textbf{S}\text{ulfides}\\\textbf{G}\text{roup 17} & \\\end{array}

These aids help you remember that:

The salts of Group 1 metals are soluble (Li₂CO₃ and KOH).

Sulfates are usually soluble, except for BaSO₄. Thus, BaSO₄ is insoluble.

Phosphates are insoluble — Mg₃(PO₄)₂

The two insoluble compounds are BaSO₄ and Mg₃(PO₄)₂.

 

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Taking into account the scientific notation, the result of the sum is 10.84300×10³.

  • <u><em>Scientific notation</em></u>

First, remember that scientific notation is a quick way to represent a number using powers of base ten.

The numbers are written as a product:

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where:

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  • <u><em>Sum in scientific notation</em></u>

You want to add two numbers in scientific notation. It should be noted that when the numbers to be added do not have the same base 10 exponent, the base 10 power with the highest exponent must be found. In this case, the highest exponent is 3.

Then all the values ​​are expressed as a function of the base 10 exponent with the highest exponent. In this case: 9.7300×10²= 0.97300×10³

Taking the quantities to the same exponent, all you have to do is add what was previously called the number "a". In this case:

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