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bearhunter [10]
3 years ago
5

Is a burning log an exothermic or endothermic event if the log is the system?

Chemistry
2 answers:
Katyanochek1 [597]3 years ago
8 0

Answer:

Exothermic

Explanation:

Burning wood provides heat through the exothermic chemical reaction of oxygen (O) with cellulose (C6H10O5), the major chemical component of wood, to produce carbon dioxide (CO2), steam (H2O) and heat.

yaroslaw [1]3 years ago
3 0

Answer:

Im the one who dont know the answer

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In an aqueous solution, 42% of a substance dissociates to release hydronium ions. Which of the following statements is true for
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Answer: The statement it is a weak acid is true for the substance.

Explanation:

An acid that dissociates completely when dissolved in water to give hydrogen (H^{+}) or hydronium (H_{3}O^{+}) ions is called a strong acid.

For example, HCl is a strong acid.

HCl + H_{2}O \rightarrow H_{3}O^{+} + Cl^{-}

An acid that dissociates partially or weakly when dissolved in water to given hydrogen or hydronium ions is called a weak acid.

For example, CH_{3}COOH is a weak acid.

CH_{3}COOH \rightleftharpoons CH_{3}COO^{-} + H_{3}O^{+}

A strong base is a base which when dissolved in water then it dissociates completely to give hydroxide ions.

For example, NaOH is a strong acid.

A weak base is a base which when dissolved in water then it dissociates partially or weakly to give hydroxide ions.

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Hence, in an aqueous solution where 42% of a substance dissociates to release hydronium ions shows that the dissociation is less than 50%. This means that substance is dissociating weakly so, it is a weak acid.

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There are four different starting molecules that one might use to synthesize the illustrated alkyl halide as the major product u
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Answer:

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The first diagram showcases the possible various starting molecules for the synthesis while the second diagram illustrates their mechanism.

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