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SVETLANKA909090 [29]
3 years ago
8

Which statement is true?

Chemistry
2 answers:
MissTica3 years ago
8 0

Answer:

The correct answer is in an exothermic reaction the energy of the product is less than the energy of the reactants.

Explanation:

Exothermic reaction is a type of reaction that generates heat.As a result in case of an exothermic reaction the energy of the reactant is more than the energy of the product.

       That"s why the enthalpy change in an exothermic reaction is always positive .

lorasvet [3.4K]3 years ago
7 0

The correct answer is C. In an exothermic reaction, the energy of the products is less than the energy of the reactants.

Explanation:

A chemical reaction is a process during which two or more substances interact and form new products. In these, the first substances are known as the reactants while the substances at the end of the reaction are the products. Moreover, reactions often involve a change in the energy of substances this known as enthalpy.

In the case of exothermic reactions in which energy or heat is released, the enthalpy is negative, this means, the energy in the products is less than in the reactants because during the chemical reaction substances release energy. This makes option C correct. On the other hand, in endothermic reactions, energy is absorbed, and therefore it is expected energy in the products is more than the one in the reactants.

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hram777 [196]

Ionic compounds are formed between oppositely charged ions.

A binary ionic compound is composed of ions of two different elements - one of which is a positive ion(metal), and the other is negative ion (nonmetal).

To write the empirical formula of binary ionic compound we must remember that one ion should be positive and other ion should be negative, then only the correct formula should be written. To write the empirical formula the charges of opposite ions should be criss-crossed.

First empirical formula of binary ionic compound is written betweenZn^{2+} (Positive ion)and F^{-} (Negative ion)

First Formula would be ZnF_{2}

Second empirical formula is between Zn^{2+}(Positive ion) and O^{2-}(Negative ion)

Second Formula would be Zn_{2}O_{2}

Note : When the subscript are same they get cancel out, so Zn_{2}O_{2} would be written as ZnO

Third empirical formula is between Ni^{4+}(Positive ion) and F^{-}(Negative ion)

Third Formula would be :NiF_{4}

Forth empirical formula is between Ni^{4+}(Positive ion)and O^{2-}(negative ion)

Forth Formula would be : Ni_{2}O_{4} or NiO_{2}

Note- The subscript will be simplified and the formula will be written as NiO_{2}.

The empirical formula of four binary ionic compounds are : ZnF_{2}, ZnO, NiF_{4},NiO_{2}


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