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swat32
2 years ago
9

Ancient metalworkers in East Africa knew the secrets of strengthening their iron. They knew that if they melted their iron in a

furnace fired with coal, then when it cooled and solidified it would be harder than the original iron. What really happened inside the hot furnace? Coal is a form of carbon, so when its heat melted the iron, tiny particles of carbon dissolved into the liquid iron. This formed a solution. When the mixture of carbon and iron cooled and solidified, it was much harder than the original iron. Since it was harder, it was much more useful for building things like tools and weapons. This solution of carbon dissolved in iron is called steel. Every time you use a tool made out of steel, you are benefiting from the discoveries of those ancient metalworkers from long ago. Read the description of how ancient metalworkers improved their iron. Then identify the solute and solvent by filling in the blanks. In steel, the solvent is and the solute is .
Chemistry
1 answer:
Ilia_Sergeevich [38]2 years ago
7 0

Answer is: in steel, the solvent is iron and the solute is the carbon.

Solution is homogeneous mixture composed of two or more substances.

In the solution, the solute molecules interact with solvent molecules.

Solvent (usually a liquid, but can also be a solid or a gas) is a substance that dissolves a solute.  Iron is solvent because there is more iron than carbon and they are both solid state.

Solvent is always the same state of matter as the solution.

In ideal solution  the forces of attraction between the solute-solute and the solvent-solvent and solute-solvent molecules are the same.

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The correct answer is option d, that is, atoms of the element.  

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The chemical reactions must be balanced, they must exhibit a similar number of atoms of each element on both the sides of the equation. As a consequence, the mass of the reactants must be equivalent to the mass of the products of the reaction.  


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2 years ago
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Which process is based on repulsion of oil and water?
Inessa [10]

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We can seprate oil and water by the process of seprating funnel

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Calculate the radius ratio for NaBr if the ionic radii of Na + and Br − are 102 pm and 196 pm , respectively. radius ratio: Base
Fudgin [204]

Answer : The expected coordination number of NaBr is, 6.

Explanation :

Cation-anion radius ratio : It is defined as the ratio of the ionic radius of the cation to the ionic radius of the anion in a cation-anion compound.

This is represented by,

\frac{r_{cation}}{r_{anion}}

When the radius ratio is greater than 0.155, then the compound will be stable.

Now we have to determine the radius ration for NaBr.

Given:

Radius of cation, Na^+ = 102 pm

Radius of cation, Br^- = 196 pm

\frac{r_{cation}}{r_{anion}}=\frac{102}{196}=0.520

As per question, the radius of cation-anion ratio is between 0.414-0.732. So, the coordination number of NaBr will be, 6.

The relation between radius ratio and coordination number are shown below.

Therefore, the expected coordination number of NaBr is, 6.

8 0
2 years ago
A sample of oxygen gas was found to effuse at a rate equal to two times that of an unknown gas. what is the molar mass (in g/mol
inn [45]
<span>128 g/mol Using Graham's law of effusion we have the formula: r1/r2 = sqrt(m2/m1) where r1 = rate of effusion for gas 1 r2 = rate of effusion for gas 2 m1 = molar mass of gas 1 m2 = molar mass of gas 2 Since the atomic weight of oxygen is 15.999, the molar mass for O2 = 2 * 15.999 = 31.998 Now let's subsitute the known values into Graham's equation and solve for m2. r1/r2 = sqrt(m2/m1) 2/1 = sqrt(m2/31.998) 4/1 = m2/31.998 127.992 = m2 So the molar mass of the unknown gas is 127.992 g/mol. Rounding to 3 significant figures gives 128 g/mol</span>
4 0
2 years ago
The density of methanol is 0.7918g/mL. Calculate the mass of 89.9mL of this liquid.
Novosadov [1.4K]
The mass is 71.2 g.

Mass = 89.9 mL × \frac{0.7918 g}{1 mL} = 71.2 g
4 0
2 years ago
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