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3 years ago

Two or more atoms can be held together through shared________.

1 answer:

8 0

The correct option is D. electrons.

Two or more atoms can be together if they share electrons with each other.
By sharing, they form a covalent bond and that way the atoms can be stable.
The electrons being shared arevalence electrons and this allows the atoms to fill their outer levels.

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B. convert sunlight into energy

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How is enthalpy used to predict whether a reaction is endothermic or exothermic?

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Answer:

$329.48 KJ/mol$ heat is released by the combustion of $2 mol$ of methane

Explanation:

The value of enthalpy determines whether the reaction is exothermic or endothermic. If the enthalpy change is positive, then the reaction is endothermic (heat or energy released) and if the enthalpy change is negative then the reaction is exothermic (heat or energy absorbed).

$2CH_4(g)+4O_2(g) => 2CO_2(g)+4H_2O(g)$

$\Delta H \ reaction=[ 2(\Delta HfCO_2)+ 4(\Delta HfH_2O)]-[2(\Delta HfCH_4)+4(\Delta HfO_2)]$

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In this question, the enthalpy of formation has positive value and hence the reaction is endothermic in which the heat is released.

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3 years ago

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4 years ago

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Answer:

yes

Explanation:

catalase is a carbohydrate

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