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OLga [1]
3 years ago
14

Which statement describes how heat is transferred by conduction?

Chemistry
2 answers:
harina [27]3 years ago
8 0

Answer:

The correct answer is D Air molecules touch the warm ground, heating them up.

Explanation:

There are three types of thermal energy: Conduction, convection, and radiation. Conduction is the process in which energy (also known as heat) is transferred from one object to another by directly touching each other (solids touching solids). Convection is the process in which energy is circulated through the movement of fluids (like liquids or gases), by hot air rising and cool air sinking. Radiation is the process in which energy is transferred from one place to another by electromagnetic waves. An example of this would be feeling warm after being outside in the sun; such as choice B, which is hence incorrect. Choice A is a rephrasing of choice C; both of which are considered convection because air is not a solid, but a gas and this air is <em>rising </em>and<em> sinking</em>. This leaves us with choice D. Choice D would be considered conduction because the air molecules are <em>touching</em> the ground; therefore, being heated <em>directly</em>.

Hope this helps,

❤<em>A.W.E.</em><u><em>S.W.A.N.</em></u>❤

Ksivusya [100]3 years ago
6 0

Answer:

the answer is d

Explanation:

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Answer:

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Explanation:

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3 years ago
(15 points). The oxidation of glucose provides the principal energy source for animal cells. The reactants are glucose [C6H12O6(
miss Akunina [59]

Answer:

Check the explanation

Explanation:

The balanced reaction

C6H12O6(s) + 6O2(g) = 6CO2(g) + 6H2O(l)

Standard heat of reaction

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= 6*(-393.5) + 6*(-285.8) - 6*(0) - (-1274.4)

= - 2801.4 kJ/mol

Part b

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Moles of glucose required = 8550 kJ / (2801.4 kJ/mol)

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Mass of glucose required = moles x molecular weight

= 3.052 mol x 180.156 g/mol

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Part c

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275 million person require = 275*10^6*3.052 = 8.39 x 10^8 mol

From the stoichiometry of the reaction

1 mol glucose produces = 6 mol CO2

8.39 x 10^8 mol glucose produces = 6*8.39*10^8

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= 2.22 x 10^11 g x 1kg/1000g

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BRAINLIEST IF ANSWERED CORRECTLY WITH EXPLANATION! HELP PLEASE:)
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First question

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Pb(NO_3)_2 + 2KI \rightarrow PbI_2 + 2KNO_3

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n_{KI} = \frac{345.0 \ g}{166.0 \ g/mol} = 2.078 \ mole

Find how many moles potassium nitrate there is for 2.078 moles KI

n_{KNO_3} = \frac{2}{2} \cdot n_{KI} = 2.078 \ mole

Find how many grams potassium nitrate there is in 2.078 moles KNO_3

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Second question

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&

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