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gulaghasi [49]
3 years ago
9

Which element would make a poor, brittle conductor? use the periodic table for help. a. sulfur b. boron c. cobalt d. calcium?

Chemistry
1 answer:
Greeley [361]3 years ago
8 0
I think the answer is C or B
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Answer: The correct answer is true.

Explanation:

There are two types of reactions based on the heat absorbed or released:

1. Exothermic reactions: In these reactions, heat is released. The energy of the products is less than the energy of the reactants. The \Delta H for these reactions is negative.

2. Endothermic reactions: In these reactions, heat is absorbed by the reactants. The energy of the products is more than the energy of the reactants. The \Delta H for these reactions is positive.

In the given equation:

P_4+5O_2\rightarrow P_4O_{10}+712kCal

The energy is written on the product side, which means that the heat is released in the reaction. Hence, the given equation is a exothermic reaction.

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