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Anuta_ua [19.1K]
3 years ago
7

PLEASE ANSWER

Chemistry
1 answer:
lana [24]3 years ago
3 0

Answer: option D. Their speed in a vacuum

Explanation:

Electromagnetic waves all have same speed in vacuum. This speed has been calculated to be 3x10^8m/s.

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Explanation:

For a flower to appear blue, "it needs to be able to produce a molecule that can absorb very small amounts of energy," in order to absorb the red part of the spectrum, Kupferschmidt said.

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Why does water have a much higher boiling point than methane even though water (H20) and methane (CH4) molecules are approximate
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Answer:

Water has a higher boiling point because the hydrogen bonds that form water molecules are stronger than the Van der Waals interactions among methane molecules, therefor more energy must be provided in order to break the hydrogen bonds and allow the water molecules to escape the liquid state.

Explanation:

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Các hạt cấu tạo nên hạt nhân của hầu hết nguyên tử gồm
butalik [34]

Answer:

hy vọng nó giúp

Explanation:

Các proton và neutron được tìm thấy trong hạt nhân của nguyên tử. Chúng chiếm phần lớn khối lượng của nguyên tử. Trên thực tế, số khối của một nguyên tố là tổng số proton và neutron của nó. Vì proton có điện tích dương và nơtron là trung hòa nên hạt nhân của nguyên tử mang điện dương

8 0
3 years ago
If ch4 and c4h8 are released simultaneously at ends of a 50.0cm long glass tube, at what distance from the left end of the tube
Keith_Richards [23]

Answer:

They meet at the distance of 32.5 cm

Explanation:

The rate of diffusion is inversely proportional to the molar mass of gases.

If diffusion is represented as d and mass of gases as M. Then , rate is given as:

d=k\sqrt{\frac{1}{M}}

For , two gases

\frac{d_{1}}{d_{2}}=\sqrt{\frac{M_{2}}{M_{1}}}

First , Calculate the ,molar mass of each gas :

CH4 = 1 (mass of C) + 4(mass of H)

= 1(12)+4(1)

= 12 + 4 = 16 gram

M1 = 16 gram

C4H8 = 4(mass of C) + 8(Mass of H)

= 4(12) + 8(1)

= 48 + 8

M2 = 56 grams

d1 is diffusion of CH4

d2 = diffusion of C4H8

\frac{d_{1}}{d_{2}}=\sqrt{\frac{M_{2}}{M_{1}}}

\frac{d_{1}}{d_{2}}=\sqrt{\frac{56}{16}}

\frac{d_{1}}{d_{2}} = 1.87

This means CH4 diffuse 1.87 times faster than C4H8

Now, the mathematical part

If velocity of C4H8 = 1 cm/sec , then velocity of CH4 = 1.87 cm/sec

v1 = 1.87 cm/sec

v2 = 1 cm/sec

Let both meet at time "t". If distance travelled by CH4(s1) = x , then remaining(s2) distance (50-x) is travelled by C4H8

(see the attached image)

time =\frac{distance}{speed}

since both meet at same time so t = constant.

\frac{s1}{v1}=\frac{s2}{v2}

\frac{x}{1.87}\frac{50-x}{1.00}

on solving for x we get,

x = 17.42 cm

from the other side the distance is (50 - x)

= 50 - 17.42 = 32.5 cm

7 0
4 years ago
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