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sertanlavr [38]
3 years ago
14

Please help me !!!!?:(

Chemistry
1 answer:
atroni [7]3 years ago
7 0
True, a lunar eclipse occurs when the Moon is between the Sun and Earth
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Which of the following particles are of approximately equal mass? (multiple answers)
balu736 [363]
Neutrons and Protons are equal in mass (≈ 1amu)
8 0
3 years ago
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Calculate the linear momentum of photons of wavelength<br> (a) 600 nm,<br> (b) 70 pm,<br> (c) 200 m.
lubasha [3.4K]

Answer:

a) p = 1.10 * 10⁻²⁷ kg·m/s

b) p = 9.46 * 10⁻²⁴ kg·m/s

c) p = 3.31 * 10⁻³⁶ kg·m/s

Explanation:

To solve this problem we use the <em>de Broglie's equation, </em>which describes the wavelenght of a photon with its momentum:

λ=h/p

Where λ is the wavelength, h is Planck's constant (6.626 * 10⁻³⁴ J·s), and p is the linear momentum of the photon.

Rearrange the equation in order to solve for p:

p=h/λ

And now we proceed to calculate, <u>keeping in mind the SI units</u>:

a) 600 nm= 600 * 10⁻⁹ m

p=(6.626 * 10⁻³⁴ J·s) / (600*10⁻⁹m) = 1.10 * 10⁻²⁷ kg·m/s

b) 70 pm= 70 * 10⁻¹² m

p=(6.626 * 10⁻³⁴ J·s) / (70*10⁻¹²m) = 9.46 * 10⁻²⁴ kg·m/s

c) 200 m

p=(6.626 * 10⁻³⁴ J·s) / (200m) = 3.31 * 10⁻³⁶ kg·m/s

7 0
3 years ago
Name the three states of matter, and the<br> physical changes that occur between them.
Nataly [62]

Answer:

Solid, Liquid, Gas

Solid to Liquid - Melting

Solid to Gas - Sublimation

Liquid to Solid - Freezing

Liquid to Gas - Vaporization

Gas to Solid - Deposition

Gas to Liquid - Condensation

Explanation:

8 0
3 years ago
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Which one of the following classes of organic compound does not contain the carbonyl (C=O) group?A) aldehydesB) carboxylic acids
vredina [299]

Answer: alcohols

Explanation:

The carbonyl group refers to C=O. It is contained in aldehyde, Ketones, carboxylic acids , esters, amides and acyl chlorides. They are not found in alcohols. The alchols are generally ROH. They do not contain any carbon-oxygen unsaturated bond in their structure hence the answer.

3 0
3 years ago
Calculate the mass of 20.0 moles of He (in g)
Daniel [21]

Explanation:

20.0 moles= 80.1 or 80.05g

5.00 moles= 20.0g

1.20×1025moles= 4923.2g

1.00 moles= 4.00g

80.0 moles= 320.2g

7 0
3 years ago
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