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3 years ago

Help for a magazine article on horses for my little sister:

Chemistry

1 answer:

Maksim231197 [3]3 years ago

6 0

Answer:

Elizabeth Madden. Palomino. 2-3 years old. Horses can sleep both lying down and standing up. Horses can run shortly after birth. Domestic horses have a lifespan of around 25 years. Ride a bike.

Explanation:

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What is oxidation number of S in H2SO5??

mote1985 [20]

★ « what is oxidation number of S in H2SO5?? » ★

it's 6!!

Explanation:

Oxidation number of S in H2SO5 is 6 .

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2 years ago

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Write the isotopic symbol for the following (show your work) a) An isotope of iodine whose atoms have 78 neutrons b) An isotope

morpeh [17]

Answer:

For a: The isotopic representation of iodine is $_{53}^{131}\textrm{I}$

For b: The isotopic representation of cesium is $_{55}^{137}\textrm{Cs}$

For c: The isotopic representation of strontium is $_{38}^{52}\textrm{Sr}$

Explanation:

The isotopic representation of an atom is: $_Z^A\textrm{X}$

where,

Z = Atomic number of the atom

A = Mass number of the atom

X = Symbol of the atom

For a:

We are given:

Number of neutrons = 78

Atomic number of iodine = 53 = Number of protons

Mass number = 53 + 78 = 131

Thus, the isotopic representation of iodine is $_{53}^{131}\textrm{I}$

For b:

We are given:

Number of neutrons = 82

Atomic number of cesium = 55 = Number of protons

Mass number = 55 + 82 = 137

Thus, the isotopic representation of cesium is $_{55}^{137}\textrm{Cs}$

For c:

We are given:

Number of neutrons = 52

Atomic number of strontium = 38 = Number of protons

Mass number = 38 + 52 = 90

Thus, the isotopic representation of strontium is $_{38}^{52}\textrm{Sr}$

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What determines the state of a substance

frez [133]

The kinetic energies of the particles (atoms, molecules, or ions) that make up a substance or object.

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Identify each of the following as a representative element or a transition element:

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The correct answer is B. Platinum is the transition element among the choices. The elements belonging to this group are those having a partially filled d or f subshell. It usually refers to the d-block transition elements of the periodic table.

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Benzene is more volatile.

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