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Gnom [1K]
3 years ago
7

What evidence exists for a more recent increase in greenhouse gas concentrations in the atmosphere

Chemistry
1 answer:
TiliK225 [7]3 years ago
6 0

Answer:

-data collected from Mauna Loa shows an increase in CO2 by 20% in the last 40 years

-ice core data shows links between CO2 and temperature, with a recent increase in both

-data from ice cores and other proxies show increases in CO2, CH4, and N2O since the Industrial Revolution

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The equation to calculate mean rate of reaction g/s
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amount of product formed or amount of reactants used / time

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In Valence Shell Electron Pair Repulsion Theory (VSEPR),
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Answer: look at the close because that is the answer

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3 because I just did it
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A gas mixture contains 0.700 mol of N2, 0.300 mol of H2, and 0.400 mol of CH4. Calculate the pressure of the gas mixture and the
Nitella [24]

Answer:

Pressure of the gas mixture: 4.30 atm

Partial pressure N₂ = 2.15 atm

Partial pressure H₂ =  0.91 atm

Partial pressure CH₄ = 1.23 atm

Explanation:

To determine partial pressure we sum the total moles in order to find out the total pressure

We can work with mole fraction

We apply the Ideal Gases Law

0.700 N₂ + 0.300 H₂ + 0.400 CH₄ = 1.4 moles

We replace data  → P . V = n . R .T

T° must be at K →  27  °C + 273 = 300 K

P . 8 L = 1.4 mol . 0.082 L.atm/mol.K  . 300 K

P = ( 1.4 mol . 0.082 L.atm/mol.K  . 300 K) / 8 L = 4.30 atm (Total pressure)

We apply the mol the fraction for the partial pressure

Moles x gas / total moles = partial pressure x gas / total pressure

Mole fraction N₂ → 0.700 /1.4 = 0.5

Partial pressure N₂ = 0.5 . 4.30 atm =2.15 atm

Mole fraction H₂  →  0.300 / 1.4 = 0.21

Partial pressure H₂ = 0.21 . 4.30 atm = 0.91 atm

Mole fraction CH₄ → 0.400 /1.4 = 0.28

Partial pressure CH₄ = 0.28 . 4.30 atm =1.23 atm

7 0
3 years ago
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1. Energy in foods is provided by
ELEN [110]

Answer:

Energy in foods is provided by macro-nutrients.

Explanation:

Nutrients are “environmental substances” used for growth, energy, and bodily functions of the  organisms. Those nutrients that are required  in larger amounts are called macro-nutrients.

There are 3 macro-nutrients needed by humans: lipids (fats), carbohydrates (sugar) and proteins. All these macro-nutrients gives energy in  form of “calories”. For example:

  • In carbohydrates, there are '4 calories' of energy per gram.
  • In proteins, there are '4 calories' of energy per gram.
  • And in lipids, there are '9 calories' of energy in one gram.

This means that if you look at a food label and it lists 10 grams of carbohydrates, 0 grams of protein, and 0 grams of fat, that food would contain 40 calories.

8 0
3 years ago
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