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3 years ago

Which of the following isotopes is needed to complete this nuclear equation?

Chemistry

2 answers:

Snezhnost [94]3 years ago

7 0

Answer:

$^{55} _{26}Fe$

Explanation:

Let's consider the following nuclear equation.

$^{55} _{25}Mn + ^{2} _{1}H \rightarrow \_\_\_ + 2^{1} _{0}n$

According to the law of conservation of matter, all the matter that is on the reactants must be in the products.

Mn has 25 protons and H has 1 proton. Therefore, in the products there must be 26 protons. The neutrons do not have protons, so the 26 protons belong to the unknown element. (The only option with 26 protons is c) Fe).

Mn has 55 -25 = 30 neutrons. H has 2 - 1 = 1 neutron. The total number of neutrons is 31. There are 2 neutrons to the right so Fe must have the remaining 29.

The mass number of Fe is 26 p⁺ + 29 n⁰ = 55. This confirms that the missing element is $^{55} _{26}Fe$ .

UkoKoshka [18]3 years ago

6 0

The correct answer is C.

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What is the valence number of an element that has 3 electron in its outermost shell?

givi [52]

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3 years ago

Suppose that a sample of gas occupies 187 mL

drek231 [11]

Answer:

V2 = 90.7 mL

Explanation:

pressure and volume are inversely proportional, if the pressure is increased, the volume will decrease. In an isothermal process:

p1V1 = p2V2

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3 years ago

Which group of coefficients balances the following chemical equation? 2KCIO3 → _KCI + _O2 a 1, 3 b 2,2 C 2,3 d 2.1 e 1, 1

Mars2501 [29]

Answer:

2KClO3 = 2KCl + 3O2

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3 years ago

What is the frequency of green light that has a wavelength of 543 nm? (c = 3.00 x 10⁸ m/s)

kirill [66]

Answer:

ν = 5.53 x 10⁶ Hz

Explanation:

The frequency of a radiation, ν ,is inversely propotional to its wavelength, and is given by:

ν = c/λ where

ν = frequency

c: speed of light, 3 x 10⁸ m/s

λ: wavelength in m

Think of frequency as the number of waves per second.

We can directly compute the answer by first converting the wavelength to m for unit consistency and then plugging the values.

1 m = 10⁹ nm

543 nm x ( 1 m / 10⁹ nm ) = 5.43 x 10⁻⁷ m

ν = c/λ = 3 x 10⁸ m/s / 5.43 x 10⁻⁷ m = 5.53x 10¹⁴ s⁻¹

In the metric system the unit s⁻¹ is called Hertz.

ν = 5.53 x 10¹⁴ Hz

3 0

3 years ago

[30 Points]

Marina CMI [18]

Explanation:

$Cu^{2+}+Zn\rightarrow Zn^{2+}+Cu$

I) Oxidation reaction : When there is an increase in oxidation state number.

$Zn\rightarrow Zn^{2+}+2e^-$

Reduction reaction : when there is a decrease in oxidation state number.

$Cu^{2+}+2e^-\rightarrow Cu$

II) Zinc metal has gone under oxidation, as its oxidation state is changing from 0 to 2+. Zinc metal is getting converted into zinc ions.

III) Copper(II) ion has gone under reduction, as its oxidation state is changing from 2+ to 0. Copper ions are getting converted into copper metal.

IV) $Cu^{2+}$ is an oxidant.

Those chemical agents which get reduced itself and oxidize others is called oxidizing agents.

V) $Zn$ is an reductant.

Those chemical agents which get oxidized itself and reduce others is called reducing agents.

3 0

4 years ago