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3 years ago

If a mineral isn't scratched by a fingernail, what can you conclude about the minerals

Chemistry

1 answer:

garri49 [273]3 years ago

8 0

Answer:

The hardness is more than 2.5. Hope this helps.

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3. A 3.455-g sample of a mixture was analyzed for barium ion by adding a small excess of sulfuric acid to an aqueous solution of

erik [133]

Answer:

$Ba\ percentage\ in\ Mass=4.8\%$

Explanation:

From the question we are told that:

Mass of mixture $m=3.455g$

Mass of Barium $m_b=0.2815g$

Equation of Reaction is given as

$Ba2+ + H2SO4 => BaSO4 + 2 H+$

Generally the equation for Moles of Barium is mathematically given by

Since

$Moles of Ba^{2+} = Moles of BaSO_4$

Therefore

$Moles of Ba^{2+} = \frac{mass}{molar mass of BaSO4}$

$Moles of Ba^{2+} = \frac{0.2815}{233.39}= 0.0012061 mol$

Generally the equation for Mass of Barium is mathematically given by

$Mass\ of\ Ba^{2+} = Moles * Molar mass of Ba^{2+}$

$Mass\ of\ Ba^{2+} = 0.0012061 * 137.33 = 0.1656 g$

Therefore

$Ba\ percentage\ in\ Mass = mass of Ba^{2+}/mass of sample * 100%$

$Ba\ percentage\ in\ Mass= \frac{0.1656}{ 3.455 }* 100%$

$Ba\ percentage\ in\ Mass=4.8\%$

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3 years ago

How might the research described in the article help address the food supply for a growing population?

Elodia [21]

I would say it’s helps with basic reproduction and let’s animals develop more.

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3 years ago

Hey there! so I have this question in chemistry where they have shown a reaction with Ammonia acid and HCL, so the question to e

lozanna [386]

What the I haven't even learned this yet

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3 years ago

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Which of the following would most likely cause a building to erode? A. acid rain B. the heat island effect C. heat pollution D.

Elena L [17]

Yeah it should be acid rain

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3 years ago

What is a displacement reactions

Alisiya [41]

<h2><u>Question</u><u>:</u>-</h2>

$\textsf{what is a displacement reactions? }$

<h2><u>Answer</u><u>:</u></h2>

$\large \underbrace{ \underline{ \sf Displacement \: reaction}}$

The reaction in which more reactive element replace a less reactive element from its compound is called displacement reaction.

Ex:-

$\bold{\large Zn+HCl \longrightarrow ZnCl_2+H_2}$

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3 years ago

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