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Rudiy27
3 years ago
14

Which of the following describes an exothermic reaction?

Chemistry
2 answers:
Pavel [41]3 years ago
6 0

Answer:

The answer to your question is:  letter A

Explanation:

a) A + B ⇒ AB + heat     It is an exothermic reaction because heat is released.

b) A + BΔ ⇒ AB  It heat added to the reactants , then it is an endothermic reaction.

c) heat + BC ⇒ B + C  It's an endothermic reaction because heat is added to the reactants.

d) B + heat + CD ⇒ BD + C  It's and endothermic reaction because heat is added to the reactants.

viktelen [127]3 years ago
6 0

Answer:

The correct answer is a"

Explanation:

Hello! Let's solve this!

Exothermic reactions are those that release heat and endothermic reactions are those that consume heat.

a) A + B ⇒ AB + heat

It indicates that heat is released by what is an exothermic reaction.

b) A + BΔ ⇒ AB Heat is added to the reaction so it is endothermic

c) heat + BC ⇒ B + C

It is an endothermic reaction because heat is consumed in the reaction.

d) B + heat + CD ⇒ BD + C

It is an endothermic reaction since it consumes heat

The correct answer is a"

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Answer:

Explanation:

En este caso para formular los compuestos, debes identificar el grupo funcional principal de la molecula. Una vez que eso está hecho, puedes intentar formularlo.

Empezaremos primero identificando el grupo funcional principal de la molécula, para luego formularlo correctamente.

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Etanol: debido a que termina en ol, este grupo pertenece a los alcoholes. Para formularlo solo se dibuja la molecula del etano, junto a un enlace con el grupo OH, como su formula general R - OH.

Propanotriol: igualmente termina en ol, por lo tanto es un alcohol, sin embargo, en este caso, tambien tiene la terminación prefija tri, asi que significa que hay 3 grupos OH en la molecula.

Acido propanodioico: esta es sencilla, porque empieza como acido, y solo hay un grupo funcional que empieza así y son los acidos carboxilicos, es decir, el grupo COOH (R - COOH) que es el carboxilo. Tiene el prefijo di, antes del oico, por lo que son dos carboxilos presentes en la molecula.

Pentanal: el sufijo al, significa que pertenece al grupo de los aldehidos, en este caso, posee el grupo carbonilo H - C = O.

Pentano - 2,4 - diona: la terminación ona significa que pertenece al grupo de las cetonas, (R - CO - R), parecido a los aldehidos, con la diferencia de que tiene grupos alquilos en lugar de un hidrogeno.

Metanoato de metilo: la terminación ato de ilo, pertenece a los esteres, (R - COOR) derivado de los acidos carboxilicos.

De aqui en adelante solo mencionaré los grupos funcionales pues ya se explicó el por que, por sus terminaciones:

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Acetato de etilo: ester

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Ciclohexanona: un ciclo (cadena cerrada) unido a un grupo carbonilo.

Butanona: cetona.

Observa la foto adjunta para que veas la formulación de cada una:

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