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3 years ago

1. Write a paragraph of 3 lines on how a rainbow form

Chemistry

2 answers:

natita [175]3 years ago

8 0

Answer:

Explanation:

A rainbow is a meteorological phenomenon that is caused by reflection, refraction and dispersion of light in water droplets resulting in a spectrum of light appearing in the sky. It takes the form of a multicoloured circular arc. Rainbows caused by sunlight always appear in the section of sky directly opposite the Sun.

hoa [83]3 years ago

3 0

A rainbow is a multicolored arc made by light striking water droplets.

The most familiar type rainbow is produced when sunlight strikes raindrops in front of a viewer at a precise angle (42 degrees). Rainbows can also be viewed around fog, sea spray, or waterfalls.

A rainbow is an optical illusion—it does not actually exist in a specific spot in the sky. The appearance of a rainbow depends on where you're standing and where the sun (or other source of light) is shining.

The sun or other source of light is usually behind the person seeing the rainbow. In fact, the center of a primary rainbow is the antisolar point, the imaginary point exactly opposite the sun.

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What property does fractional distillation rely on?

Tcecarenko [31]

Fractional distillation relies on the property that each substance has a different boiling point and will turn into vapour and rise at different points in time. This is also how they are collected because of the difference in their boiling points.
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4 0

4 years ago

Arrange these elements according to atomic radius. Sr, Ba, Be, Ca, Mg

vovangra [49]

To arrange these elements according to the atomic radius (smallest to largest) would be:

Be, Mg, Ca, Sr, Ba

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4 years ago

Suppose you have 1.00 l of an aqueous buffer containing 60.0 mmol acetic acid (pka = 4.76) and 40.0 mmol acetate. what volume of

butalik [34]

Required pH = 4.93
- OH⁻ from NaOH reacts with CH₃COOH giving CH₃COO⁻ and H₂O
- Let the volume of 3.5 M NaOH be x ml
Moles of NaOH = Moles of OH⁻ = Molarity * x ml = 3.5x mmol
- The reaction table for moles is as follows:
CH₃COOH + OH⁻ → CH₃COO⁻ + H₂O
Initial 60 3.5x 40
Change -3.5x -3.5x +3.5x
Final (60-3.5x) 0 (40+3.5x)
- Substitute in Henderson equation and solve for x:
pH = pKa + log $\frac{[CH_{3}COO^-]}{[CH_3COOH]}$
4.93 = 4.76 + log $\frac{(40+3.5x)}{(60-3.5x)}$
0.17 = log $\frac{(40+3.5x)}{(60-3.5x)}$
$\frac{(40+3.5x)}{(60-3.5x)} = 1.479$
x = 5.62 ml NaOH required

4 0

3 years ago

Draw the resonance structures for (SCN)".

Phantasy [73]

Answer : The resonance structure of $SCN$ is shown below.

Explanation :

Resonance structure : It is defined as when more than one Lewis structure can be drawn, the molecule or ion is said to have resonance.

Resonance is the concept where electrons (bonds) are delocalized over three or more atoms which cannot be depicted with one simple Lewis structure.

First we have to draw Lewis-dot structure.

Lewis-dot structure : It shows the bonding between the atoms of a molecule and it also shows the unpaired electrons present in the molecule.

In the Lewis-dot structure the valance electrons are shown by 'dot'.

The given molecule is, $SCN$

As we know that sulfur has '6' valence electrons, carbon has '6' valence electrons and nitrogen has '5' valence electron.

Therefore, the total number of valence electrons in $SCN$ = 6 + 4 + 5 = 15

According to Lewis-dot structure, there are 7 number of bonding electrons and 8 number of non-bonding electrons.

In SCN, carbon atom is the central atom and sulfur and nitrogen are the neighboring atoms.

The resonance structure of $SCN$ is shown below.

3 0

4 years ago

The diagram below shows the layers in Earth's interior.

Arada [10]

Answer:

layer B is liquid because of the inner members and layer A is solid because of the outer members

5 0

2 years ago

1. Write a paragraph of 3 lines on how a rainbow form ​

1. Write a paragraph of 3 lines on how a rainbow form