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3 years ago

The combination of gases that surrounds and protects the earth is known as

Chemistry

2 answers:

MissTica3 years ago

8 0

Answer : Atmosphere.

Explanation : The combination of gases that surrounds and protects the earth is known as Atmosphere.

An atmosphere is defined as a layer or a set of multiple layers of gases surrounding a planet or other material body, which is held in place by the gravity of that body.

It acts as an envelope of air around the earth and protects the earth from the harmful ultraviolet rays coming from the sun. Air in the atmosphere contains high amount of nitrogen which is 78.09 percent, oxygen is 20.95 percent, argon is 0.9 percent argon, carbon dioxide is 0.04 percent there is also small amounts of other gases.

Lunna [17]3 years ago

5 0

The combination of gases that surround and protect the Earth is the ATmosphere

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34. According to Bohr's theory, an electron's path around the nucleus defines its

Georgia [21]

<u>Answer</u>:

According to Bohr's theory, an electron's path around the nucleus defines its

energy level.

<u>Explanation</u>:

It the certain energy by which the electrons have occupied there place in the orbitals. They can also be moved to the higher energy level by taking the energy from the surrounding. The emission of light can be seen when the electron falls from the higher energy state to the lower state. The orbital that is close to the atomic centre having the lowest energy level and the one that is found to be far away from the atomic centre has the highest energy level.

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3 years ago

What is the mole ratio needed to determine the mass of phosphorus trifluoride produced from the reaction of 120 g of phosphorus

Vitek1552 [10]

Answer:

$\frac{4molPF_3}{1molP_4}$

Explanation:

Hello

In this case, given the reaction:

$P_4(s)+6F_2(g)\rightarrow 4PF_3(g)$

It means that since the coefficients preceding phosphorous and phosphorous trifluoride are 1 and 4, the correct mole ratio should be:

$\frac{4molPF_3}{1molP_4}$

Because given the mass of phosphorous it is convenient to convert it to moles and then cancel it out with the moles on bottom of the mole ratio.

Bes regards!

8 0

3 years ago

A sample of gas at 313 K and 4.95 atm occupies 85.62 L of space. Which

Daniel [21]

Answer: 85.62 L represents volume (V).

Explanation:

Volume is defined as the amount or quantity of a given substance or an object.

According to ideal gas equation:

$PV=nRT$

P = pressure of gas = 4.95 atm

V = Volume of gas = 85.62 L

n = number of moles

R = gas constant = $0.0821Latm/Kmol$

T =temperature = $313K$

Thus 85.62 L represents volume (V).

8 0

4 years ago

Be sure to answer all parts. Enter your answers in scientific notation.

Andrews [41]

Answer:

a) f = 3.02x10¹⁵ s⁻¹, and λ = 99.4 nm.

b) 99.4 nm

Explanation:

a) The energy of radiation is given by:

E = h*f

Where h is the Planck constant (6.626x10⁻³⁴ J.s), and f is the frequency. To have the highest frequency, the energy must be the highest too, because they're directly proportional. So we must use E = -E1 = 20x10⁻¹⁹ J

20x10⁻¹⁹ = 6.626x10⁻³⁴xf

f = 3.02x10¹⁵ s⁻¹

The wavelenght is the velocity of light (3.00x10⁸ m/s) divided by the frequency:

λ = 3.00x10⁸/3.02x10¹⁵

λ = 9.94x10⁻⁸ m = 99.4 nm

b) To have the shortest wavelength, it must be the highest energy and frequency, so it would be the same as the letter a) 99.4 nm.

8 0

3 years ago

Write a paragraph explaining the effect of surface area on the rate of reaction.

nexus9112 [7]

(For a bit of context I will use the reaction between HCl and Mg as an example)

The larger the surface area of the magnesium metal, the more particles are exposed to collide with the aqueous HCl particles to cause the reaction to occur. This increases the frequency per second of collisions, speeding up the rate of reaction.

The effect of a catalyst is to reduce the minimum collision energy which allows the reaction to happen. This does not increase the number of collisions per second, but increases the percentage of successful collisions, which consequently causes the rate of reaction to increase .

I have drawn diagrams showing the effect of surface area, but there isn't really a meaningful diagram that I know of to show the impact of a catalyst (at least not at GCSE level).

6 0

3 years ago