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3 years ago

How should the enthalpy of an intermediate step be manipulated when used to produce an overall chemical equation?

2 answers:

8 0

The enthalpy of an intermediate step when used to produce an overall chemical equation should be manipulated in this way:
Multiply the enthalpy by –1 if the chemical equation is reversed.
If the forward reaction requires energy, the reverse will produce energy.

AVprozaik [17]3 years ago

8 0

Ans: Multiply the enthalpy by –1 if the chemical equation is reversed.

Enthalpy is a thermodynamic state function which represents the heat content of a system. For chemical reactions, enthalpy can be used to predict if the reaction is endothermic or exothermic.

If the enthalpy of the reactants is greater than products, the reaction is exothermic. If the reactants have a lower enthalpy than products, then the reaction is exothermic.

For a multistep reaction, the enthalpy of the intermediate step should be multiplied by -1 if the chemical reaction needs to be reversed in order to get the overall reaction.

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Create a chart that compares physical and chemical properties. Give two examples for each type of property

Zinaida [17]

Answer:

Chemical properties:

Those properties which change the chemical nature of matter.

Example:

Heat of combustion
Enthalpy of formation

Physical properties:

Those properties which do not change the chemical nature of matter.

Example

Differences between chemical and physical properties:

Chemical properties Physical properties

1. Observed after the change bringing 1. Observed with out being

the change change

2. These changes the molecules 2. only change physical state

3. Chemical identity changes 3.Chemical identity not changes

4. Structure of material changes 4.Structure of material not change

5. Chemical reaction is needed 5. No need of Chemical reaction

6. depend on composition 6. Does not depend on composition

3 0

3 years ago

How many square centimeters are in an area of 8.50 inch^2

Paha777 [63]

Explanation:

Given parameters:

Dimension = 8.5in²

we are to convert from in² to cm²

in² = in x in

cm² = cm x cm

1 in = 2.54cm

Using dimensional analysis;

8.5in² x $\frac{2.54cm}{1in} x \frac{2.54cm}{1in}$

= 54.84cm²

We solved this problem using dimensional analysis where we multiplied the unit with 1.

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5 0

3 years ago

What is indicated by the methyl-prefix?

ruslelena [56]

Answer:

Methyl is the IUPAC nomenclature of organic chemistry term for an alkane (or alkyl) molecule, using the prefix "meth-" to indicate the presence of a single carbon.

Explanation:

I hope it's help u

7 0

3 years ago

the first three ionization energies of an element x are 590, 1145, and 4912 kj mol-1. what is the most likely formula of the com

joja [24]

Answer: The chemical formula is $XSO_3$

Explanation:

Ionization energy is defined as the amount of energy that is required to remove an electron from a chemical species.

The ionization energy equation for the given values follow:

$X(g)\rightarrow X^+(g)+e^-;E_I=590kJ/mol$

$X^+(g)\rightarrow X^{2+}(g)+e^-;E_I=1145kJ/mol$

$X^{2+}(g)\rightarrow X^{3+}(g)+e^-;E_I=4912kJ/mol$

From the values of ionization energy above, it can be seen that the ionization energy increases as every succeeding electron is removed.

Second ionization energy is a little higher than the first one but there is a huge amount of difference between the third and second ionization energy.

This implies that the ion formed during second ionization energy has a stable configuration and it requires a humongous amount of heat to release the third electron.

Hence, the ion formed will be $X^{2+}$

Sulfite ion is a polyatomic ion having a chemical formula of $SO_3^{2-}$

An ionic compound is formed between the two ions and the chemical compound formed between the two will have a formula of $XSO_3$

Hence, the chemical formula is $XSO_3$

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3 years ago

A cell using protein-mediated facilitated diffusion is treated with a toxin that prevents conformation change in the membrane pr

seraphim [82]

Answer:

The most likely outcome is that carrier protein dysfunction will increase the gradient which will lead to disruption of cellular metabolism.

3 0

3 years ago