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3 years ago

An a transition metal with 91 protons and electrons?

Chemistry

2 answers:

ser-zykov [4K]3 years ago

6 0

Protactinium

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grin007 [14]3 years ago

3 0

Answer:

Protactinium

Explanation:

the atomic number lines up with the number of protons and electrons an element has.

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What is the relationship between radioactive decay and radiometric dating?

Reil [10]

Answer:

Radiometric dating, is called radioactive dating, is a technique used to determine the age of materials such as rocks. It is based on a comparison between the observed abundance of a naturally occurring radioactive isotope and its decay products, using known decay rates.

Explanation:

6 0

3 years ago

You are given 10.00 mL of a solution of an unknown acid. The pH of this solution is exactly 2.95. You determine that the concent

Naily [24]

Answer:

$1.038\times 10^{-5}$ is dissociation constant and the value of $pK_a$ is 4.98.

Explanation:

The pH of the solution = 2.95 M

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

$2.95=-\log[H^+]$

$[H^+]=10^{-2.95}=0.001122 M$ ..[1]

Concentration of unknown monoprotic acid = C = 0.1224 M

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

Initially

C 0 0

At equilibrium

(C-x) x x

The expression of a dissociation reaction can be written as;

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

$K_a=\frac{x^2}{(C-x)}$

$[H^+]=x =0.001122 M$ ( from [1])

$K_a=\frac{(0.001122 M)^2}{(0.1224 M-0.001122 M)}$

$K_a=1.038\times 10^{-5}$

The value of $pK_a$ :

$pK_a=-\log[K_a]$

$=-\log[1.038\times 10^{-5}]=4.98$

$1.038\times 10^{-5}$ is dissociation constant and the value of $pK_a$ is 4.98.

8 0

3 years ago

At the end of the isomerization reaction, what chemical is used to quench the residual bromine?

bazaltina [42]

Answer:

They are constitutional isomers and diastereomers.

8 0

3 years ago

While preforming an experiment involving colors and heat,Susan noticed that the black paper was warmer than the white piece of p

Firdavs [7]

Answer:

Blackbody radiation

Explanation:

This phenomenon described by Susan is know as black body radiation. Different materials by color reacts to incident radiation on them in diverse manner.

A white surface will reflect all the wavelength of light incident on it.
A black surface will absorb all the wavelength of light on it.

This absorption causes the black surface to be hotter compared to other surfaces.

3 0

3 years ago

Why is it not recommended to use red, yellow or blue in the chromatography lab? Explain your reasoning in at least two sentences

bazaltina [42]

Answer:

solvent (such as water, oil or isopropyl alcohol) is allowed to absorb up the paper strip. ... Different molecules run up the paper at different rates. As a result, components of the solution separate and, in this case, become visible as strips of color on the chromatography paper.

Explanation:

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4 years ago