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alisha [4.7K]
3 years ago
13

Which type of matter can be separated only by physical change

Chemistry
1 answer:
Marta_Voda [28]3 years ago
7 0

Answer:

Mixture

Explanation:

Mixtures are a physical combination of two or more substances. They can be separated based only by physical means.

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The activation energy for the reaction NO2(g)+CO(g)⟶NO(g)+CO2(g) is Ea = 375 kJ/mol and the change in enthalpy for the reaction
HACTEHA [7]
Answer: 625 kj/mol

Explanation:

As shown below this expression gives the activation energy of the reverse reaction:

EA reverse reaction = EA forward reaction + | enthalpy change |

1) The activation energy, EA is the difference between the potential energies of the reactants and the transition state:

EA = energy of the transition state - energy of the reactants.

2) The activation energy of the forward reaction given is:

EA = energy of the transition state - energy of  [ NO2(g) + CO(g) ] = 75 kj/mol

3) The negative enthalpy change - 250 kj / mol for the forward reaction means that the products are below in the potential energy diagram, and that the potential energy of the products, [NO(g) + CO2(g) ] is equal to 375 kj / mol - 250 kj / mol = 125 kj/mol

4) For the reverse reaction the reactants are [NO(g) + CO2(g)], and the transition state is the same than that for the forward reaction.

5) The difference of energy between the transition state and the potential energy of [NO(g) + CO2(g) ] will be the absolute value of the change of enthalpy plus the activation energy for the forward reaction:

EA reverse reaction = EA forward reaction + | enthalpy change |

EA reverse reaction = 375 kj / mol + |-250 kj/mol | = 375 kj/mol + 250 kj/mol = 625 kj/mol.

And that is the answer, 625 kj/mol
4 0
3 years ago
What is the most important part of driving
Romashka-Z-Leto [24]
I think learn to drive is the most important part
4 0
4 years ago
Read 2 more answers
How many liters of Carbon Tetra Oxide gas in 152.0 grams?​
sattari [20]

Answer:

Hello

so ur answer is

56.74L

Explanation:

thanks... hope it helps

6 0
3 years ago
What would be the freezing point of a 1.7 mole aqueous ethylene glycol solution? The freezing point depression constant for wate
nata0808 [166]

Answer:

-3.2^oC

Explanation:

In order to answer this question, we need to be familiar with the law of freezing point depression. The law generally states that mixing our solvent with some particular solute would decrease the freezing point of the solvent.

This may be expressed by the following relationship:

\Delta T_f=iK_fb

Here:

\Delta T_f=T_{initial}-T_{final} is the change in the freezing point of the solvent given its initial and final freezing point temperature values;

i is the van 't Hoff factor (i = 1 for non-electrolyte solutes and i depends on the number of moles of ions released per mole of ionic salt);

K_f is the freezing point depression constant for the solvent;

b=\frac{n_{solute}}{m_{solvent}} is molality of the solute, defined as a ratio between the moles of solute and the mass of solvent (in kilograms).

We're assuming that you meant 1.7-molal solution, then:

b=1.7 m

Given ethylene glycol, an organic non-electrolyte solute:

i=1

The freezing point depression constant:

K_f=1.86^oC/m

Initial freezing point of pure water:

T_{initial}=0.00^oC

Rearrange the equation for the final freezing point and substitute the variables:

T_f=T_o-iK_fb=0.00^oC-1\cdot1.86^oC/m\cdot1.7 m=-3.16^oC

8 0
3 years ago
the atomic mass of magnesium is 24 daltons and the atomic number is 12. a. how many electrons does an electrically neutral magne
vekshin1

Atomic Mass will be 23 the new magnesium formed will be its isotope of magnesium.

We know that,

In stable condition

Number of electrons = Number of protons

Atomic number represents number of proton .

So, here number of proton is 12

Therefore, number of electron is 12

We know that -

Atomic mass = number of protons +Number of neutron

So if magnesium loses one neutron i.e. new number of neutron is 11

then its atomic mass changes.

New atomic mass will be

Atomic mass = 12 + 11

Atomic mass = 23

This new element with atomic mass 23 and atomic number 12 is the isotope of magnesium.

To know more about isotopes

brainly.com/question/11291241

#SPJ4

3 0
2 years ago
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