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In-s [12.5K]
2 years ago
7

57. A recipe for s'mores calls for 2 graham crackers, 2 chocolate pieces and 1 marshmallow. If I

Chemistry
1 answer:
geniusboy [140]2 years ago
5 0

Answer:Noble gases:

 are highly reactive.

 react only with other gases.

 do not appear in the periodic table.

 are not very reactive with other elements.

Explanation:Noble gases:

 are highly reactive.

 react only with other gases.

 do not appear in the periodic table.

 are not very reactive with other elements.

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3 years ago
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We have to convert 2100 kilojoule into calories.

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The chemical reaction gives off 2100 Kilojoule of heat energy which indicates that the reaction is exothermic in nature. Calorie and Kilojoule both are units of energy. We know, 1 calorie=4.2 kilojoule= 4.2 KJ. So 4.2 KJ is equal to 1 Calorie i.e, 4.2 KJ= 1 Calorie. So, to convert KJ to calorie, we have to divide the energy given in KJ by quantity 4.2. Hence, 2100 Kilojoule energy is equal to \frac{1 X 2100}{4.2} Calorie= 500 Calories.



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