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Olenka [21]
3 years ago
14

In an experiment, Ann mixes concentrated sulfuric acid with water in a reaction test tube. The walls of the test tube turn hot.W

hich of the following type of reaction has occurred?
A) endothermic
B) exothermic
C) reversible
D) irreversible
Chemistry
2 answers:
vladimir2022 [97]3 years ago
8 0
B) Exothermic
The reaction released heat energy to its surrounding, thus, it was exothermic.
"exo" is to expel or put outside
"thermic" means heat
liraira [26]3 years ago
6 0

Answer: B) exothermic

Explanation:

Endothermic: The chemical reactions in which reactants form products by absorption of energy are called as endothermic reactions.

Exothermic : The chemical reactions in which reactants form products along with release of energy are called as exothermic reactions. Thus if walls turn hot that means the energy has been released.

Reversible: The chemical reactions in which reactants form products and products can also be converted back to reactants are called as reversible reactions.

Irreversible: The chemical reactions in which reactants form products but products can not be converted back to reactants are called as irreversible reactions.

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Answer:

The mass of the products left in the test tube will be less than that of the original reactants.

Explanation

The equation for the reaction is

Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)

 1.0          3.0              3.9             0.1

Assume you started with 1.0 g of Mg.

It will react with 3.0 g of HCl to form 3.9 g of MgCl2 and 0.1 g of H2

.

Mass of reactants = mass of products

        1.0 g + 3.0 g = 3.9 g + 0.1 g

                    4.0 g = 4.0 g

The Law of Conservation of Mass is obeyed.

However, your test tube and its contents will weigh 0.1 g less than it did before the reaction.

Does that contradict the Law of Conservation of Mass? It does not.

One of the products was the gas, hydrogen, and it escaped from the test tube. You weren't measuring all the products, so test tube and its contents weighed less than before.

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