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3 years ago

Select all that apply. Atoms are made up of _____. neurons photons protons neutrons

1 answer:

8 0

Hello!

Atoms are made of 3 types of particles: Electrons, protons, and neutrons. The protons and neutron (referred to collectively as nucleons) make up the nucleus (center) of the atom, while the electrons surround the nucleus.

Answer:
Protons, neutrons, and electrons.

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A specific amount of energy is emitted when excited electrons in an atom in a sample of an element return to the ground state.Th

lubasha [3.4K]

The answer is C. The specific amount of energy emitted when electrons jump from excited states to the ground state refers to emission spectrum. The energy is emitted in the form of photons, and the photons have very specific wavelengths (energy) that correspond to the energy gaps between the excited states and the ground state. The specific wavelengths of light emitted are referred to as the "emission spectrum," and each element produces a different emission spectrum. Thus, this emitted energy can be used to identify the element from which your sample was taken.

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3 years ago

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What is the ph of a solution with a hydroxyl ion (oh-) concentration of 10-10 m? what is the ph of a solution with a hydroxyl io

krek1111 [17]

According to this formula:
pH = - log [H]
And, pOH = - log [OH] >>> (1)
Where, pH + pOH = 14 >>> (2)
∵ the hydroxide ion concentration = (OH-) = 10 ^ -10 M
from (1) and (2) and by substitution:
∴ pOH = - log [10^-10] = 10
∴ pH = 14 - 10 = 4

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3 years ago

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A weak monoprotic acid has molar mass 180 g/mol. When 1.00 g of this acid is dissolved in enough water to obtain a 300 mL soluti

Kaylis [27]

<u>Answer:</u> The value of $K_a$ for the given acid is $3.58\times 10^{-4}$

<u>Explanation:</u>

To calculate the molarity of solution, we use the equation:

$\text{Molarity of the solution}=\frac{\text{Mass of solute}\times 1000}{\text{Molar mass of solute}\times \text{Volume of solution (in mL)}}$

Initial mass of weak monoprotic acid = 1.00 g

Molar mass of weak monoprotic acid = 180 g/mol

Volume of solution = 300 mL

Putting values in above equation, we get:

$\text{Molarity of weak monoprotic acid}=\frac{1.00\times 1000}{180\times 300}\\\\\text{Molarity of weak monoprotic acid}=0.0185M$

To calculate the hydrogen ion concentration for given pH of the solution, we use the equation:

$pH=-\log[H^+]$

We are given:

pH = 2.62

Putting values in above equation, we get:

$2.62=-\log[H^+]$

$[H^+]=10^{-2.62}=2.40\times 10^{-3}M=0.0024M$

The chemical equation for the dissociation of weak monoprotic acid (HA) follows:

$HA\rightleftharpoons H^++A^-$

<u>Initial:</u> 0.0185

<u>At eqllm:</u> 0.0185-x x x

Evaluating the value of 'x'

$\Rightarrow x=0.0024$

So, equilibrium concentration of HA = (0.0185 - 0.0024) = 0.0161 M

Equilibrium concentration of $A^-$ = x = 0.0024 M

The expression of $K_a$ for above equation follows:

$K_a=\frac{[H^+][A^-]}{[HA]}$

Putting values in above equation, we get:

$K_a=\frac{(0.0024)\times (0.0024)}{0.0161}=3.58\times 10^{-4}$

Hence, the value of $K_a$ for the given acid is $3.58\times 10^{-4}$

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4 years ago

100 POINTS! Need help ASAP!

Doss [256]

Answer:

5ML

Explanation:

Neutral litmus paper is usually purple. however in this case the neutral color seems to be yellow. Litmus can also be prepared as an aqueous solution that functions similarly. Under acidic conditions, the solution is red, and under alkaline conditions, the solution is blue.

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3 years ago

What dissolved species are present in a solution of naclo4? express your answers as ion separated by a comma?

Afina-wow [57]

The dissolved species that are present in solution of NaClO4 are Na+ , ClO4-

<h3>Explanation</h3>

when substance dissolve in water it dissociate in ions. Some substance dissociate partially when they dissolve in water while others dissociate completely. NaClO4 is a salt which dissociate completely when it dissolve in water to give Na+ and CIO4- ions

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3 years ago

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