Why is charcoal black?

Chemistry

1 answer:

sp2606 [1]3 years ago

8 0

Charcoal absorbs all wavelengths of light that fall on it.

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Why are naturally occurring substances, such as particulates or carbon dioxide, sometimes considered pollutants?

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Because despite being natural they still harm the ozone layer and cause breathing problems, even suffocation.

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2 years ago

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What does radiochemical dating do

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Radiometric dating, often called radioactive dating, is a technique used to determine the age of materials such as rocks.

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2 years ago

2. A sample of neon gas has a volume of 87.6 L at STP. How many moles are present?

PSYCHO15rus [73]

Answer:

3.91 moles of Neon

Explanation:

According to Avogadro's Law, same volume of any gas at standard temperature (273.15 K or O °C) and pressure (1 atm) will occupy same volume. And one mole of any Ideal gas occupies 22.4 dm³ (1 dm³ = 1 L).

Data Given:

n = moles = <u>???</u>

V = Volume = 87.6 L

Solution:

As 22.4 L volume is occupied by one mole of gas then the 16.8 L of this gas will contain....

= ( 1 mole × 87.6 L) ÷ 22.4 L

= 3.91 moles

<h3>2nd Method:</h3>

Assuming that the gas is acting ideally, hence, applying ideal gas equation.

P V = n R T ∴ R = 0.08205 L⋅atm⋅K⁻¹⋅mol⁻¹

Solving for n,

n = P V / R T

Putting values,

n = (1 atm × 87.6 L)/(0.08205 L⋅atm⋅K⁻¹⋅mol⁻¹ × 273.15K)

n = 3.91 moles

Result:

87.6 L of Neon gas will contain 3.91 moles at standard temperature and pressure.

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3 years ago

At room temperature (208C) and pressure, the density of air is 1.189 g/L. An object will float in air if its density is less tha

Ugo [173]

Total density of filled ball with nitrogen gas: $\frac{0.12G+0.6524g}{0.560L} = 1.3792g/L$

The relationship between mass and volume can be easily determined using density; for example, the mass of a body is equal to its volume multiplied by the density (M = Vd), whereas the volume is equal to the mass divided by the density (V = M/d). The ball filled with nitrogen will not float in the air because total density of filled ball is greater than the density of an air. Density of the evacuated ball D = 0.214 g/L

Density of nitrogen gas = $d_4=1.165g/L$