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4 years ago

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

2 answers:

8 0

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

AVprozaik [17]4 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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Which transition metals are paramagnetic but can easily form ferromagnetic alloys with other metals?

Brrunno [24]

Answer: Paramagnetism is most easily observed in the salts of some of the first row transition metals (manganese through nickel). The se metal ions have unpaired electrons in degenerate d orbitals as predicted by Hund's rule and thus exhibit paramagnetism.

Explanation: METALS ARE ELECTRONS

AND PARAMAGNETIC OBSERVES SALT FORST ROWS ONLY

6 0

3 years ago

Potassium permanganate, KMnO, and glycerin, C3H5(OH)3, react explosively according to the

Finger [1]

The volume of CO2 at STP =124.298 L

<h3>Further explanation</h3>

Given

Reaction

4 KMnO4, +4 C3H5(OH)5, -7K2CO3, + 7 Mn2O3, +5 CO2, + 16 H2O

701,52 g of KMnO4

Required

volume of CO2 at STP

Solution

mol KMnO4 (MW=158,034 g/mol) :

mol = mass : MW

mol = 701.52 : 158.034

mol = 4.439

mol CO2 from equation : 5/4 x mol KMnO4 = 5/4 x 4.439 = 5.549

At STP 1 mol = 22.4 L, so for 5.549 moles :

=5.549 x 22.4

=124.298 L

4 0

3 years ago

Need help ASAP please

GuDViN [60]

Answer:Melting can create steam, kind of like a nukeular plant exept no nukulear rods

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4 years ago

Read 2 more answers

Why are pennies good for simulating radioactive atoms? Check all that apply

gavmur [86]

Answer:

all of them are correct.

Explanation:

Just took it on e2020

5 0

3 years ago

How does the formation of covalent bonds relate to the octet rule?

Triss [41]

Answer:

Covalent bonding occurs when atoms share valence electrons to form a chemical bond. Atoms of nonmetals form covalent bonds by sharing electrons in order to achieve an octet of valence electrons, like the noble gases, except for helium, which only has two valence electrons. The octet refers to the highest energy s and p sublevels, the valence shell, which in noble gases, except for helium, are filled with eight electrons, two in the s sublevel and six in the p sublevel.

7 0

3 years ago