What is rust and why don't we want it floating around in our body

1 answer:

6 0

Rust is when a metal turns brown-ish red-ish and that tells you that the metal is old and is no longer useful. we don't want it floating in our bodies because it's rusted metal. hope this helped! :)

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Classify these substances as elements, mixtures or compounds. gold dust - honey - ink

Musya8 [376]

Honey is a - Mixture

Ink is - Mixture

And Gold Dust is a - Compound

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4 years ago

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PLEASE HELP 15 POINTS ONE QUESTION

KIM [24]

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maks197457 [2]

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In lab you have to prepare 530. 00 ml solution of 0. 125 m copper (ii) oxide. How many grams of solid sodium nitrate must be use

GarryVolchara [31]

The grams of solid copper oxide must be used to prepare a solution of 0.125m concentration is 5.26 g.

According to the definition of molar concentration of a substance dissolved in a solution is defined as the ratio of the number of moles to the volume of the solution.

C = n/V

The number of moles is equal to the given mass divided by the molar mass.

n = m/Mm = n ×m

Given,

The volume of the solution of copper oxide = 0.53

Molar mass of copper oxide = 79.5

Concentration of copper oxide = 0.125

CuO = cVM

= 0.125 × 0.53 × 79.5

= 5.26g

Thus, we concluded that the grams of solid copper oxide must be used to prepare a solution of 0.125m concentration is 5.26 g.

DISCLAIMER: The above question is wrong. The correct question is

Question: In lab you have to prepare 530. 00 ml solution of 0. 125 m copper (ii) oxide. How many grams of solid copper oxide must be used to prepare a solution of this concentration?

learn more about molar concentration :

brainly.com/question/14803618

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Solutions of mercury (I) nitrate and potassium bromide are mixed

Afina-wow [57]

With that informatio you can:

1) Write the chemical equation
2) Balance the chemical equation
3) State the molar ratios
4) Predict if precipitation occurs.

I will do all four, for you:

1) Chemical equation:

mercury(I) nitrate potassium bromide mercury(I) bromide potassium nitrate
Hg2(NO3)2 + KBr → Hg2Br2 + KNO3

2) Balanced chemical equation

Hg2(NO3)2 + 2KBr → Hg2Br2 + 2KNO3

3) Molar ratios or proportions:

1 mol Hg2(NO3)2 : 2 mol KBr : 1 mol Hg2Br2 : 2 mol KNO3

4) Prediction of precipitation.

You can use the solubility rules or a table of solubilities. I found in a table of solutiblities that mercury(I) bromide is insoluble and potassium bromide is soluble, Then you can predict that the precipitation of mercury(I) bromide will occur.

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3 years ago