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padilas [110]
3 years ago
7

Which letter on the graph above represents fusion?

Chemistry
1 answer:
zvonat [6]3 years ago
6 0

Answer:

The figure here is missing, so we cannot say what is the corresponding letter; however we can describe what nuclear fusion is.

Nuclear fusion is a nuclear process in which light nuclei fuse together into a heavier nucleus. In the reaction, the total mass of the initial nuclei is less than the total mass of the final nucleus, so part of the mass has been converted into energy, according to the equation:

\Delta E=c^2 \Delta m

where

\Delta E is the energy released

c is the speed of light

\Delta m is the mass defect, which is the mass difference between reactants and products.

Since the factor c^2 is very large, we can see that the amount of energy released by a process of nuclear fusion is huge.

An example of nuclear fusion is the fusion of hydrogen nuclei into  helium. This process occurs in the core of the stars, and it is the main process through which stars produce energy. In order to occur, the temperature inside the core must be at the order of several million degrees, because the nuclei must overcome the electrostatic repulsion between them, so that they can come close enough to fuse together: for this reason, nuclear fusion is difficult to achieve on Earth, since it is very challenging to recreate the same conditions of temperature and pressure that we have in the core of the stars.

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What is the number of kilograms of solvent in a 0.70 molal solution containing 5.0 grams of solute?
Leya [2.2K]
Molar mass of solute is 30 g/mol 
molality is defined as the number of moles of solute in 1 kg of solvent 
number of moles of solute - 5.0 g / 30 g/mol = 0.17 mol
molality of solution is 0.70 mol/kg
the mass of solvent when there are 0.7 mol of solute - 1 kg
then the mass of solvent when there's 0.17 mol of solute - 0.17 mol / 0.7 mol/kg
= 0.242 kg
therefore mass of solvent is 0.242 kg
3 0
3 years ago
What is used up in and stops a chemical reaction?
frutty [35]

Answer:What is used up in and stops a chemical reaction? (a) percent yield (b) limiting reactant (c) theoretical yield (d) excess reactant

The correct option is (b)

Explanation:

A chemical reaction is a chemical combination,rearrangement or disintegration of chemical substance(s) (called reactants) to form new chemical substance(s) (called products).

A limiting reactant is the reactant that is totally used up during the course of a reaction. When this reactant is used up, it limits the amount of products formed and eventually stops the chemical reaction.

Explanation:

The limiting reagent is the reactant that is used up completely. This stops the reaction and no further products are made. ... This method is most useful when there are only two reactants. The limiting reagent can also be derived by comparing the amount of products that can be formed from each reactant.

hope this helps have a nice day❤️

6 0
3 years ago
You wish to construct a buffer of pH=7.0. Which of the following weak acids (w/ corresponding conjugate base) would you select?
Alex17521 [72]

Answer:

C.) HOCl Ka=3.5x10^-8

Explanation:

In order to a construct a buffer of pH= 7.0 we need to find the pKa values of all the acids given below

we Know that

pKa= -log(Ka)

therefore

A) pKa of  HClO2 = -log(1.2 x 10^-2)

=1.9208

B) similarly PKa of HF= -log(7.2 x 1 0^-4)= 2.7644

C)  pKa of HOCl= -log(3.5 x 1 0^-8)= 7.45

D) pKa of HCN = -log(4 x 1 0^-10)=  9.3979

If we consider the  Henderson- Hasselbalch equation for the calculation of the pH of the buffer solution

The weak acid for making the buffer must have a pKa value near to the desired pH of the weak acid.

So, near to value, pH=7.0. , the only option is HOCl whose pKa value is 7.45.

Hence, HOCl will be chosen for buffer construction.

3 0
3 years ago
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frutty [35]
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We choose the smaller number of the two as the answer to this item. Thus, the answer to this question is 172 mol of H2O can be formed out of the given quantities. 
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