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rjkz [21]
3 years ago
13

which of these releases heat a. melting candle wax b.boiling water to make stem c. burning wood in a campfire d. making popcorn

over a fire
Chemistry
1 answer:
zvonat [6]3 years ago
8 0

c. burning wood in a campfire

Explanation:

Wood burning in a campfire is an exothermic process.

An exothermic reaction is one in which heat is liberated to the surroundings. The heat content of the reactants is greater than that of the products.

Every burning process is an exothermic reaction.

An exothermic reaction liberates heat to the surrounding.

Other option given takes heat from the surrounding.

learn more:

Exothermic process brainly.com/question/10567109

#learnwithBrainly

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750.0g of water that was just boiled (heated to 100.0/c loses 78.45KJ of heat as it cools.What is the final temperature of water
Iteru [2.4K]
  • Mass=m=750g=0.75kg
  • Q=78.45\times 10^3J=78450J
  • T_i=100°C
  • T_f=?
  • Specific heat capacity=c=4200J/kg°C

According to thermodynamics

\\ \tt\bull\rightarrowtail Q=mc\Delta T

\\ \tt\bull\rightarrowtail Q/mc=\Delta T

\\ \tt\bull\rightarrowtail \Delta T=\dfrac{78450}{0.75(4200)}

\\ \tt\bull\rightarrowtail \Delta T=24.9°C

\\ \tt\bull\rightarrowtail T_i-T_f=24.9

\\ \tt\bull\rightarrowtail T_f=100-24.9=76.1°C

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I think its 0.301

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Complete the sentences to explain what a similar treatment would predict for the effective nuclear charge on boron valence elect
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Answer:

ZcH's electrons = 5-2 = +3.

ZcH for inner electrons = -5 - 0 = +5.


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