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3 years ago

What biological molecules provide energy and structural support to living organisms?

Chemistry

1 answer:

Romashka [77]3 years ago

3 0

Answer:

Option D: Carbohydrates

Explanation:

Carbohydrates are a group of macromolecules that are a vital energy source for the cell, provide structural support to many organisms, and can be found on the surface of the cell as receptors or for cell recognition.

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A firecracker exploding would be an example of a (n) ___? A. Physical change B. Exothermic reaction C. Formation of a precipitat

Jobisdone [24]

The answer would be A) or the first option.

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4 years ago

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The following is known as the thermite reaction: 2Al(s)+Fe2O3(s)→Al2O3(s)+2Fe(s) This highly exothermic reaction is used for wel

Colt1911 [192]

Answer:

$\Delta H_{rxn}=-847.6\ KJ/mol.$

Explanation:

The balanced chemical equation is:

$2Al(s)+Fe_2O_3(s)-->Al_2O_3+2Fe(s)$

Now, standard values of $\Delta H_f\ of\ all\ participants\ of\ reaction.$

$\Delta H_f(Al_2O_3)=-1669.8\ KJ/mol\\\Delta H_f(Fe_2O_3)=-822.2\ KJ/mol\\\Delta H_f(Al(s))=0\ KJ/mol\\\Delta H_f(Fe(s))=0\ KJ/mol\\$

Now, We know $\Delta H_{rxn}=\Delta H_{products}-\Delta H_{reactants}$

Putting all values of $\Delta H_f$ to above equation.

We get,

$\Delta H_{rxn}=-847.6\ KJ/mol.$

Hence, this is the required solution.

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4 years ago

What is the effect of an increase in the average kinetic energy of an object

timofeeve [1]

The effect of an increase in the average kinetic energy of an object would be an increase in the temperature of the object. Temperature is directly proportional to the average kinetic energy of the molecules in the object. Hope this answers the question.

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4 years ago

Help please I don’t know the answer

Nostrana [21]

The answer is 3 It is a body of knowledge gained using inquiry and experimentation. Hope this helped!

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4 years ago

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Light travels in _______.

Thepotemich [5.8K]

Should be C. I think

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3 years ago