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Katena32 [7]
3 years ago
15

The Sun keeps shining a) mostly by gravitation contraction b) mostly by chemical reactions c) by converting hydrogen to helium.

d) by converting hydrogen to carbon. e) by E = mc2. f) by F=G M_1 M_2/R12
Chemistry
1 answer:
Georgia [21]3 years ago
6 0

Answer:

C) by converting hydrogen to helium.

Explanation:

The Sun keeps shining because of nuclear fusion processes, which consists in creating helium atoms by combining hydrogen atoms, of an atomic mass less that of helium, in conditions of high core pressure and temperature. In other words, the Sun keeps shining by producing helium at the expense of its hydrogen reserves.

Therefore, the correct answer is C.

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Calculate δs∘rxn for the reaction2no(g) o2(g)→2no2(g)express your answer to one decimal place and include the appropriate units
Anna35 [415]

The δs∘rxn  for the reaction 2NO(g) + O_{2} → 2NO_{2} (g) will be -146 J/K.

Entropy would be a measurable physical characteristic and a scientific notion that is frequently connected to a condition of disorder, unpredictability, or uncertainty.

Entropy would be a measurement of the system's unpredictability or disorder. The entropy increases as randomness do. It has broad properties as well as a state function. It has the unit JK^{-1} mol^{-1}.

Entropy of the reaction can be calculated by the reaction.

ΔS^{0} rxn = 2 mol × S^{0} (NO_{2} (g) - 2 mol × S^{0} NO (g) - 1 mol × S^{0} (O_{2} )

ΔS^{0} rxn  = 2 mol × 240 J/mol.K - 2 mol × 210 J/mol.K-1 mol  ×205.2 J/mol.K

ΔS^{0} rxn  = -146.8 J/K

Therefore, the δs∘rxn  for the reaction 2NO(g) + O_{2} → 2NO_{2} (g) will be -146 J/K.

To know more about reaction

brainly.com/question/20305735

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4 0
1 year ago
Chemistry intro please help
evablogger [386]

Answer:

The protons and electrons are attracted to each other because they are oppositely charged particles.

Explanation:

Protons have a positive charge and electrons have a negative charge, opposites attract.

5 0
4 years ago
The common pathway for the oxidation of glucose and fatty acids is ________.
finlep [7]
The citric acid cycle should be the answer.
3 0
3 years ago
Where is the type of force a person stands on the floor and his weight is 752 in in the pressure exerted from his feet on the fl
ladessa [460]

Answer:

0.084m^2

Explanation:

Data obtained from the question include:

W (weight) = F (force) = 752N

P (pressure) = 9002Pa

Recall:

101325Pa = 101325N/m2

Therefore, 9002Pa = 9002N/m2

Pressure exerted on an object is simply force per unit area. It is represented mathematically as:

Pressure = Force /Area

With the above formula, we can easily find the area as follow:

Pressure = Force /Area

P = F/A

9002 = 752/A

Cross multiply to express in linear form

9002 x A = 752

Divide both side by 9002

A = 752/9002

A = 0.084m^2

Therefore, the area of his feet is 0.084m^2

3 0
4 years ago
Volume is defined as the amount of mass that an object has. true false
Ierofanga [76]
False. volume is the amount of space the object occupies.
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