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alexdok [17]
3 years ago
8

Write the equality and conversion factors, and identify the numbers as exact or give the number of significant figures for which

of the following:A. The Daily Value (DV) for iodine is 150 mcg.B. The nitrate level in well water was 32 ppm.C. Gold jewelary contains 58% gold by mass.D. The price of a litre of milk is $1.65.
Chemistry
1 answer:
alexira [117]3 years ago
8 0
B. Nitrate level in well water was 32 ppm
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A hydrogen atom with its electron in the n = 6 energy level emits a photon of IR light. Calculate (a) the change in energy of th
geniusboy [140]

Answer:

(a) The change in energy of the atom is --6.0528 X 10⁻²⁰ J

(b) The wavelength of the photon is 32841 Å

Explanation:

E = -kz²/n²

Where;

E is the change in the energy of the atom

k is a constant = 2.179 X 10¹⁸ J

z is the atomic number of hydrogen = 1

n = 6

E = -(1 X 2.179 X 10⁻¹⁸ )/6²

E = -6.0528 X 10⁻²⁰ J

Therefore,the change in energy of the atom is -6.0528 X 10⁻²⁰ J

(b) the wavelength (in Å) of the photon, can be calculated as follows;

E = hc/λ

λ = hc/E

where;

h is Planck's constant = 6.626 X 10⁻³⁴ js

c is the speed of light = 3 X 10⁸ m/s

λ  is the wavelength of the photon

λ  = (6.626 X 10⁻³⁴ X 3 X 10⁸ )/(6.0528 X 10⁻²⁰)

λ  = 3.2841 X 10⁻⁶ m

λ  = 32841 Å

Therefore, the wavelength of the photon is 32841 Å

3 0
3 years ago
The largest population that an environment can support is called _____.
Digiron [165]

Answer:

D) caring capacity

Explanation:

<h3>The largest population that an environment can support is called its carrying capacity.</h3>

<h2>hope it helps.</h2><h2>stay safe healthy and happy.</h2>
4 0
3 years ago
Read 2 more answers
Why are hurricanes so frequent in areas close to the equator?
Tpy6a [65]
Because its where the warm water is, the warmer the water, the stronger the hurricane, and plus its tides that brings the warm water

Hope this helps! :)
8 0
4 years ago
3. How many moles of aluminum are needed to react completely with 1.2 mol of FeO?
hoa [83]

Answer:

ssf

Explanation:

3 0
3 years ago
Much of the mass of an atom is concentrated in its nucleus. The nucleus contains , and the outer part of the atom contains ​
Gemiola [76]

Answer:

Nucleus contain protons and neutrons while outer part contain electrons.

Explanation:

Atoms are the fundamental unit of matter. Every thing in the universe that occupy space and have mass is called matter. we can say that every matter is composed of atoms. while the atom is composed of subatomic particles called electron proton and neutron.

Subatomic particles       Relative charge       Relative mass

Proton                                 +1                              1

Neutron                                0                             1

Electron                                -1                           0.0005

Electron:

The electron is subatomic particle that revolve around outside the nucleus and has negligible mass. It has a negative charge.

Symbol = e⁻

Mass= 9.10938356×10⁻³¹ Kg

electrical charge on electron= -1.6022 × 10⁻¹⁹ C

It was discovered by j. j. Thomson in 1897 during the study of cathode ray properties.

Proton and Neutron:

An atom consist of positively charged central core (nucleus) that is made up of Proton and neutron.  Proton has positive charge while neutron is electrically neutral. Proton is discovered by Rutherford while neutron is discovered by James Chadwick in 1932.

Symbol of proton= P⁺  

electrical charge on proton= +1.6022 × 10⁻¹⁹ C

Mass of proton=1.672623×10⁻²⁷ Kg

Symbol of neutron= n⁰

Mass of neutron=1.674929×10⁻²⁷ Kg

electrical charge on neutron= 0

6 0
3 years ago
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