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3 years ago

Please help this is so hard 1: Why is the sky blue?

Chemistry

2 answers:

Veseljchak [2.6K]3 years ago

8 0

Answer:

1. blue light is scattered more than red light

2. The surface of the moon is reflecting the sun's light into our eyes. When we see the moon during the day it's because the moon is in the right spot in the sky and it's reflecting enough light to be as bright, or brighter, than the sky

3. 14.7 lbs per square inch of earth surface which is roughly 11 billion billion pounds

4. 5.972 × 10^24 kg

5. They are lift, weight, thrust and drag. Lift pushes the airplane up

6. because its viscosity is low,

7. light striking water droplets

8. The energy bypasses the birds and keeps flowing along the wire instead

kolezko [41]3 years ago

4 0

Answer:

1. As white light passes through our atmosphere, tiny air molecules cause it to 'scatter'. Therefore, blue light is scattered more than red light and the sky appears blue during the day.

2. We can see the moon during the day for the same reason we see the moon at night. The surface of the moon is reflecting the sun's light into our eyes. When we see the moon during the day it's because the moon is in the right spot in the sky and it's reflecting enough light to be as bright, or brighter, than the sky.

3. At eight pounds per gallon, that's another 38,593,169,564 pounds of water in the air. Add it all up, and the total weight of our sky is 12,107,415,382,493,169,564 pounds, more than 12 quintillion pounds!

4. 5.972 × 10^24 kg

5. Four forces keep an airplane in the sky. They are lift, weight, thrust and drag. Lift pushes the airplane up.

6. Water is wet, in the sense of being a liquid which flows easily, because its viscosity is low, which is because its molecules are rather loosely joined together.

7. Rainbows are formed when sunlight is scattered from raindrops into the eyes of an observer. The lower the sun in the sky the more of an arc of a rainbow the viewer will see. Rain, fog or some other source of water droplets must be in front of the viewer.

8. Birds can sit on power lines and not get electric shocks because the electricity is always looking for a way to get to the ground. The birds are not touching the ground or anything in contact with the ground, so the electricity will stay in the power line.

Explanation:

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Write a balanced equation for the reaction of Zn(H₂O)₄²⁺ in aqueous NaCN.

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Na is spectator ion , it is not present in final solution.

What is a full balanced equation?

The global balance equations (also known as full balance equations) are a set of equations that characterize the equilibrium distribution (or any stationary distribution) of a Markov chain, when such a distribution exists.

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Phosphine, PH₃, is a colorless, toxic gas that is used in the production of semiconductors as well as in the farming industry. W

Vilka [71]

Answer:

0.57 atm

Explanation:

Anytime a reaction is of the first order, the integrated law states that

ln[A]t/[A]₀ = - kt

where [A]t is the concentration of A ( phosphine in this question ) after a time, t

[A]₀ is the initial concentration of A (phosphine also)

k is a constant,

t is the time

We also know that for a first order reaction,

half life is t1/2 =0.693/k, then, k= 0.693/ t 1/2

where t 1/2 is the half-life.

This equation is derived for a situation when A]t/= 1/2 x [A]₀ which occurs at the half-life.

Thus, finding k from the half life time, and then solving it for a time t = 70.5 s

k = 0.693 / 35.0 s = 0.0198 s⁻¹

ln [ PH₃ ]t / [ PH₃]₀ = - kt

from ideal gas law we know that pV = nRT, so the volumes will cancel:

ln (pPH₃ )t / p(PH₃)₀ = - kt

taking inverse log to both sides of the equation:

(pPH₃ )t / p(PH₃)₀ = - kt

then

(pPH₃ )t = 2.29 atm x e^(- 0.0198 s⁻¹ x 70.5 s ) = 0.57 atm

4 0

3 years ago

The Haber Process is the main industrial procedure to produce ammonia. The reaction combines nitrogen from air with hydrogen mai

Firdavs [7]

Answer:

A) $N_2(g)+3H_2(g)\rightleftharpoons 2NH_3(g)$ .

B) $Kc=0.0933$ .

C) 0.9 mol.

D) Increasing both temperature and pressure.

Explanation:

Hello,

In this case, given the information, we proceed as follows:

$N_2(g)+3H_2(g)\rightleftharpoons 2NH_3(g)$

B) For the calculation of Kc, we rate the equilibrium expression:

$Kc=\frac{[NH_3]^2}{[N_2][H_2]^3}$

Next, since at equilibrium the concentration of ammonia is 0.6 M (0.9 mol in 1.5 dm³ or L), in terms of the reaction extent $x$ , we have:

$[NH_3]=0.6M=2*x$

$x=\frac{0.6M}{2}=0.3M$

Next, the concentrations of nitrogen and hydrogen at equilibrium are:

$[N_2]=\frac{1.5mol}{1.5L}-x=1M-0.3M=0.7M$

$[H_2]=\frac{4mol}{1.5L}-3*x=2.67M-0.9M=1.77M$

Therefore, the equilibrium constant is:

$Kc=\frac{(0.6M)^2}{(0.7M)*(1.77M)^3}\\ \\Kc=0.0933$

C) In this case, the equilibrium yield of ammonia is clearly 0.9 mol since is the yielded amount once equilibrium is established.

D) Here, since the reaction is endothermic (positive enthalpy change), one way to increase the yield of ammonia is increasing the temperature since heat is reactant for endothermic reactions. Moreover, since this reaction has less moles at the products, another way to increase the yield is increasing the pressure since when pressure is increased the side with fewer moles is favored.

Best regards.

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3 years ago