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3 years ago

7

In what ways is the reaction between calcium and water different than the reactions between sodium and water, and potassium and

water?

1 answer:

adoni [48]3 years ago

5 0

Answer:

esta con's para 15, tu the diamatera' la 24 equlia 5<4 ponte 50

Explanation:

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A student was comparing the solubility of equal amounts of table salt and table sugar at different temperatures.The table below

Mama L [17]

The sample that has the highest solubility is THE FIRST SAMPLE [TABLE SUGAR NO 1].
Solubility refers to the quantity of a solute that will dissolve in a given volume of solvent at a given temperature and pressure. The question above tells us that equal amounts of sugar and table salts were used. But looking at the table given in the question, you will see that sample 1 has the highest amount of solute that dissolve, that is 80, the rest of the samples have values that are lower than that.

8 0

3 years ago

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Calculate the acid dissociation constant of a weak monoprotic acid if a 0.5M solution of this acid gives a hydrogen-ion concentr

RUDIKE [14]

Let the acid be HA.
The chemical formula for this acid will be the following:

$HA \rightleftharpoons H^{+}+A^{-}$

The formula for the <span>acid dissociation constant will be the following:

</span> $K_a= \dfrac{[H^+][A^-]}{[HA]}$
<span>
We know [H+]=0.0001 (it's given).
However, we must find [A-] and [HA] in order to solve for the constant.

We find that [A-]=[H+] by using a electroneutrality equation.
Also, we can create a concentration equation to find [HA].

</span> $0.5M=[A^-]+[HA]$
$[HA]=0.5M-[A^-]$
<span>
Now, we can find the acid dissociation constant.

</span> $K_a= \dfrac{[H^+][A^-]}{0.5M-[A^-]}$

$= \dfrac{0.0001*0.0001}{0.5-0.0001} = 2.0*10^{-8}$

4 0

3 years ago

The last column of the periodic table contains the noble gases elements that do not easily form chemical bonds. Why don’t these

ozzi

Answer:

its is because the chemicals are very diffraction from each other so which makes it difficult to form a chemical bond.

6 0

3 years ago

A pure substance Cannot be separated into other substances <br> by_____ means

nirvana33 [79]

Explanation:

By ordinary chemical means/reaction

3 0

2 years ago

PLEASE ANSWER FAST!!!!!!

lara31 [8.8K]

Answer:

A by 0,5 cubic centimeters

Explanation:

If you use the density equation:

$d=\frac{mass}{volume}$ → $v=\frac{m}{d}$

For A:

$v=\frac{9[g]}{10g/cm^3} =0,9[cm^3]$

For B:

$v=\frac{4[g]}{10g/cm^3} =0,4[cm^3]$

Doing the difference A-B=0,5 cubic centimeter

3 0

3 years ago

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