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4 years ago

What is melting point depression?and when it accurse?

2 answers:

7 0

<span>A melting point is the characteristic physical property of a substance. So melting point analysis is one of the simplest and most useful techniques for identifing of a chemical substance. Melting point analysis can also provide information about the purity of a sample. A substance containing soluble impurities usually melts at a lower temperature than the pure compound. It can also melt over a wide range of temperatures. The smaller the range of melting temperatures, the higher the purity of the sample.</span>

ASHA 777 [7]4 years ago

4 0

Answer:

melting point depression of the phenomenon of reduction of the melting point of a material with reduction of its size. the phenomenon is very prominent in nenoscale material, which melt at temperatures hundreds of degrees lower then bulk materials

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Step 1: Translate the starting chemicals into formulas:Iron metal, in the presence of oxygen,----->Step 2: Predict the produc

Natalija [7]

Answer:

Explanation:

Here, we want to write the chemical reaction

step 1:

we start by writing the reaction between iron and oxygen

We have this as:

$\text{ Fe + O}_2$

step 2:

Now, we want to predict the product as follows:

$\text{ Fe + O}_2\text{ }\rightarrow Fe_2O_3$

step 3:

We proceed to balance the chemical reaction as follows by ensuring that the number of elements moles on the reactant side is equal to the number of moles of the elements on the products side as follows:

$\text{ 4Fe + 3O}_2\text{ }\rightarrow2Fe_2O_3$

3 0

1 year ago

Give the measurement following sig fig rules for tools. Do not forget the unit after your number measurement.

In-s [12.5K]

Answer:

Explanation:

You are not really helped by what is hold the liquid. Beakers and cylinders come on a lot of sizes. I hate to be crabby about things like that, but you really need to be aware that the question is slightly flawed (not your fault).

The beaker, you'd be like to get 1 sig digit. You have to be awfully careful about claiming more. So the and is 50 mL, but that mL is a guess and the 50 is not totally accurate, but what would you say the second digit is? 48 or 47? You don't really know. Maybe even 49.

The graduated cylinder is a little better. Read the bottom of the meniscus (the bottom of the 1/2 bubble). I think you can get 2 sig digs., so the answer is 36 mL. But everything also depends on what you have been told.

5 0

3 years ago

Consider the equilibrium reaction. 4A+B↽−−⇀3C After multiplying the reaction by a factor of 2, what is the new equilibrium equat

disa [49]

8A+2B——> 6C
since you multiply by a factor of 2 you do that to each letter
4*2=8
1*2=2
3*2=6

8 0

4 years ago

Carl's chemistry teacher asked him to make a 1 M sodium chloride solution. Carl measured 58.44 grams NaCl, added it to a volumet

Nastasia [14]

Answer:

After measuring the solute, Carl should first dissolve the solid in a small amount of DI water before diluting to the total volume.

Explanation:

To ensure that all the solute dissolves in the solution, first dissolve the solid in less than the total volume of solution needed.

4 0

4 years ago

Read 2 more answers

Calculate the pressure exerted by 1.0 mol of C6H6behaving as a)a perfect gas and b) a van der Waals gas when it is confined unde

Sholpan [36]

Answer:

The detailed calculation is shown in the attached file.

last condition (1000 K in 150.000 dm3) will have the least deviations and it is the condition where real gas will behave as ideal gases

Explanation:

Real gas behave more ideally or they tend towards ideality when there is the least deviation, or their inter-molecular forces between their molecules are mainly responsible for their deviations as such gases with the strongest intermolecular forces shows the strongest deviations. As such, when their is an increase in temperature and volume and a decrease in pressure, real gas tends towards ideal gas in this case.

From the three conditions given, it is obvious that the last condition(1000 K in 150.000 dm3) will have the least deviations.

6 0

4 years ago