CHEMISTRY HIGH SCHOOL

Explain how humans have impacted the biome in which you live which is missouri

Answers

Answer 1
Answer: humans have impacted wwell almost everything including the technology well the biome includes them because of there radiation power and the next que is confusing. sorry

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What is the total number of moles of solute in 250 milliliters of a 1.0 M solution of NaCl

Answers

First, the Molarity equation is M = mol/L. However, the problem is looking for the TOTAL NUMBER OF MOLES in which will have you to reposition the said equation: mol = M/L. Observe that you need L not mL, so you need to convert 250 mL to L that will results to .25 L. Then, substitute the value of the units to the formula and you should be able to get 4 moles. 

Answer:

0.25

Explanation:

Calculate the change in energy of an atom that emits a photon of wavelength 2.21 meters. (Planck’s constant is 6.626 x 10-34 joule seconds, the speed of light is 2.998 x 108 m/s)

Answers

Answer:

The atom's energy will decrease by 8.99 x 10⁻²⁶ J.

Explanation:

The atom's energy will go down by an amount equal to the energy of the photon that it emits.

The energy E of a photon is inversely proportional to its wavelength according to the following equation, where h is Planck's constant and c is the speed of light:

E = (hc)/λ

We substitute the values into the equation to solve for the energy:

E = (hc)/λ = (6.626 x 10⁻³⁴ J·s)(2.998 x 10⁸ m·s⁻¹) / 2.21 m

E = 8.99 x 10 ⁻²⁶ J

Thus, the atom's energy will decrease by 8.99 x 10⁻²⁶ J.
  Energy of photon = h x f 
f = v/wavelength 
f = 3x10^8 / 2.21 = 1.357x10^8 
E = 8.99x10^-26 joules i hope i helped u

An atom is determined to contain 12 protons, 10 electrons, and 12 neutrons. What are the mass number and charge of this atom or ion? Select one:
a. mass number: 24, charge: +2
b. mass number: 22, charge: neutral
c. mass number: 34, charge: -2
d. mass number: 34, charge: +2

Answers

The mass mass number is 22 and the charge of the atom is +2. The correct answer is option A

How to determine the mass number and charge?

1. The mass number of the atom can be obtained as follow:

  • Number of protons = 12
  • Number of neutrons = 12
  • Mass number =?

Mass number = number of proton + number of neutron

= 12 + 12

= 24

2. The charge of the atom can be obtained as follow:

  • Number of protons = 12
  • Number of electrons = 10
  • Charge =?

Charge = number of protons - number of electrons

= 12 - 10

= +2

Thus, the mass number is 24 and the charge is +2. The correct answer to the question is option A

Learn more about mass number:

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Mass number= atomic number + number of  neutrons.
A=Z+N
Z=number of protons=12
N=12

A=12+12=24

If, we have 12 protons and 10 electrons, the charge of this ion is +2

Therefore: mass number:24; charge: +2

Answer: a. mass number: 24; charge: +2

Atoms of I-131 spontaneously decay when the(1) stable nuclei emit alpha particles(2) stable nuclei emit beta particles
(3) unstable nuclei emit alpha particles
(4) unstable nuclei emit beta particles

Answers

The unstable nuclei emit beta particles.

What is unstable nuclei?

An atom is unstable (radioactive) if these forces are unbalanced; if the nucleus has an excess of internal energy. Instability of an atom's nucleus may result from an excess of either neutrons or protons.

What is beta particle?

  • An unstable nucleus can emit a fast-moving electron called a beta particle, to become more stable.
  • Beta radiation is made up of a stream of beta particles emitted from unstable nuclei.
  • Beta radiation is normally emitted from unstable nuclei in which the number of neutrons is much larger than the number of protons.
  • A beta particle has a relative mass that can be considered to be zero, so its mass number is zero, and as the beta particle is an electron, it can be written as  ⁰₋₁e. It can also be written as ⁰₋₁β.

Atoms of I-131 spontaneously decay when the unstable nuclei emit beta particles.

The unstable nuclei undergo spontaneous decay by emitting radiations to attain stability. Stability of isotopes is based on the ratio of neutrons and protons in its nucleus. Although most nuclei are stable, some are unstable and spontaneously decay, emitting radiation.

Hence, option 4 is the answer.

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Answer;

(4) unstable nuclei emit beta particles

Atoms of I-131 spontaneously decay when the unstable nuclei emit beta particles.

Explanation;

-Unstable nuclides undergo spontaneous change or the spontaneous decay by emitting radiations to attain stability. Stability of isotopes is based on the ratio of neutrons and protons in its nucleus. Although most nuclei are stable, some areunstable and spontaneously decay, emitting radiation.

What role does evidence play in repeating experiments?

Answers

It helps affirm results of previous experiments.

What is the dog's momentum

Answers

momentum for a dog is food pursuit all natural dog food kines-is premium dog food..  

Answer:

112 kg•m/s east

Explanation:

AYE PECKS
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