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Evgen [1.6K]
2 years ago
6

Which notations represent hydrogen isotopes?

Chemistry
2 answers:
german2 years ago
5 0
Hydrogen<span> (</span>H) <span>has three naturally occurring </span>isotopes<span>, sometimes denoted </span>1<span>H, </span>2<span>H, and </span>3<span>H</span>
lisabon 2012 [21]2 years ago
3 0

Isotopes are chemical elements with same atomic number (Z), but different mass number (different number of neutrons).

Hydrogen is an element with atomic number 1. It has three isotopes:

1) protium (₁¹H), with mass number 1 (no neutrons).

2) deuterium (₁²H), with mass number 2 (one neutrons, n° = 2 -1, n° = 1).

3) tritium (₁³H), with mass number 3 (two neutrons, n° = 3 -1, n° = 2).

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An unknown compound contains 38.7 % calcium, 19.9 % phosphorus and 41.2 % oxygen. what is the empirical formula of this compound
Softa [21]

Answer: Ca3(PO4)2

Explanation:

  • We assume that the sample is 100.0 g.
  • The sample contains 38.7 g of Ca, 19.9 g of P, and 41.2 g of O as the proportions show.
  • Then we can calculate the number of moles of each component (n = m/atomic mass).
  • The number of moles of Ca = 38.7/40.078 = 0.96 mol.
  • The number of moles of P = 19.9/30.97 = 0.64 mol.
  • The number of moles of O = 41.2/15.99 = 2.75 mol.
  • Now, we can get the molar ratios of different components (Ca, P, and O) in the sample by dividing the number of moles of each component by the lower number of moles, that we should divide the number of moles by (0.64).
  • Ca: P: O = (0.96/0.64) : (0.64/0.64) : (2.75/0.64) = 1.5 : 1 : 4.
  • To avoid the fraction of the ratios, we can multiply all ratios by 2.0.
  • Now, the ratio of Ca : P : O will be 3 : 2 : 8.
  • That main the empirical formula of the compound is Ca3P2O8 which can be expressed as calcium phosphate (Ca3(PO4)2).
8 0
2 years ago
If you place an item that is 2g/cm3 in a glass of water, will the object float or sink?
Phantasy [73]
It will sink in that glass of water.
as, it's density is more than density of water.

you might be known that the density of water is 1g/cm^2 and it's given that the density of the item is 2g/cm^2,
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An object only floats in water if it's density is less than that of water so,
that item is going to sink.
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3 years ago
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Answer:

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3 years ago
In the preparatory reaction which involves moving pyruvic acid into the mitochondrion
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In the preparatory reaction that involves movement of pyruvic acid into mitochondria TAKES PLACE IN THE MITOCHONDRIAL MATRIX WHERE THE PYRUVIC ACID IS OXIDIZED AND CARBON DIOXIDE IS RELEASED. In this reaction, NAD+ is also reduced. The end products of a preparatory reaction are 4 NADH molecules, 4 hydrogen ions,  2 carbon dioxide molecules, 2 ATP molecules and 2 acetyl CoA molecules.
8 0
2 years ago
A(n) ___ root is a root that is introduced into an equation in the process of solving the equation but does not satisfy the cond
Leto [7]

Answer:

An Extraneous root

Explanation:

A(n) Extraneous root is a root that is introduced into an equation in the process of solving the equation but does not satisfy the conditions of the original equation.

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