3 years ago

3. Which best describes the definition for the atomic mass of an element?

Chemistry

1 answer:

vesna_86 [32]3 years ago

7 0

Answer:

Explanation:

Its the sum of the protons and neutrons.

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PLZ HELP :) chemistry

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Ionic bonds are formed due to tendency of a metal to donate an electron and tendency of non metal to gain an electron.

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3 years ago

Which of the following is the greatest mass? Select one:

algol13

Answer:

B. 1.000 × 10-4 kg

Explanation:

A. 1.000 × 10-8 Mg = 0.00000001 Mg = 0.1 mg

B. 0.0001 kg = 0.1 g

C. 1000 ug = 1 mg

D. 1 .000 × 10-2 cg = 0.01 cg = 0.1 mg

A = D

B > C > A = D

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Jim collects a sample of beach sand during a class trip. After a close inspection of the sample he classifies it as a ________ m

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The anwser is letter A

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What is the energy of a photon of infrared radiation with a frequency of 2. 53 × 1012 Hz? Planck’s constant is 6. 63 × 10–34 J •

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The energy of the IR photon is $\rm 1.68\;\times\;10^{-21}$ J. Thus, option C is correct.

The energy of the radiations propagating in the air with the velocity of $\rm 3\;\times\;10^8$ m/s is given by:

$E=h\nu$

Where, <em>h </em>is Planck's constant, and $\nu$ is the frequency.

<h3>Computation for the energy of IR photon</h3>

The value of Planck's constant is given as, $\rm 6.63\;\times\;10^{-34}\;J.s^-^1$

The frequency of the IR radiation is $\rm 2.53\;\times\;10^1^2\;Hz$

Substitute the values for the energy of the photon

$\rm E=6.63\;\times\;10^{-34}\;J.s^{-1}\;\times\;2.53\;\times\;10^{12}\;Hz\\ E=16.8\;\times\;10^{-22}\;J\\E=1.68\;\times\;10^{-21}\;J$

The energy of the IR photon is $\rm 1.68\;\times\;10^{-21}$ J. Thus, option C is correct.

Learn more about the energy of photons, here:
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a standard solution is made by diluting a small volume of stock solution. if 2.42 ml of stock solution is mixed with 7.55 ml of

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Answer:

tobacco

Explanation:

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