Elements and Compounds

Disregard the electrons, as their relative mass is insignificant to that of protons and neutrons. To find atomic mass, add the numbers of protons and neutrons: 5 + 6 = 11 is the mass number.

'Au' is short for 'Aurum' , which is the Latin name for 'Gold'.

Similarly ; -

Ag ; Argentum ' Silver

Hg ; Hydragyrum 'Mercury'

Cu ; Cuprum . Copper

Na ; Nadium . Sodium

K ; Kalium ' Potassium

NB When science cannot give a modern name for something, it falls back on the Classical Languages.

Iron(II) chloride ; Ferrous chloride

Iron(III) chloride ; Ferric chloride.

It all depends on the oxidation state of iron.

You have written the word eq'n for yourself.

Iron + Chlorine = Iron Chloride.

There are tqwo possibilities/ They are

1. 1,1,-dibromo ethane ( CHB2-CH3 ) .

2. 1,2- dibromo ethane ( CH2Br-CH2Br ).

No such compound as ' BaSO5 '.

If you mean ' BaSO4 '. it is barium sulphate.

Zn + HCl ---> ZnCl2 + H2

ZINC CHLORIDE IS THE ANSWER

When hydrogen nuclei fuse together, they can form helium. This fusion process is the energy source for stars, including our sun, where hydrogen nuclei combine to form helium through a series of nuclear reactions.

NO!!!!

Helium is the MOST inert element, AND DOES NOT REACT WITH ANUTHIMG.

Yes, hydrogen, oxygen, and helium are elements. They are all pure substances made up of only one type of atom. Helium is the second lightest element, hydrogen is the lightest, and oxygen is the third most abundant element in the universe.

No, Iron is a homogeneous mixture as long as the iron is pure

Depends on the oxidation state of iron.

Iron(II) chloride ; FeCl2 ; Ferrous chloride

Iron(III) chloride ; FeCl3 ; Ferric Chloride.

LiBr is 'lithium bromide'

The number of neutrons can vary, depending on the Atomic Mass.

For any given element the number of protons ALWAYS remains the same. The number of neutrons can vary ; this being an isotope.

So you can have lithium six ; Li-6 ' [6/3]Li

or

lithium seven ; Li-7 ; [7/3]Li

The formula are incorrect, and the charges are NOT balanced.

The redox reaction is

Cl2 + 2Br^(-) = 2Cl^(-) + Br2

Remember the aide memoire, OILRIG.

OIL ; **Ox**idation Is Loss of electrons

RIG ; **Red**uction Is Gain of electrons.

RedOx is a reaction that occurs simultaneously. One component is reduced ,and the other component is oxidaised.

Above

Chlorine gas is Reduced. It has gained electrons, to form the chloride ion

The half eq'n is Cl2(g) + 2e^(-) = 2Cl^(-)

Simultaneously and 'vice versa'

The Bromide ion has been oxidised, lost electrons , to form elemental bromine.

The half eq'n is 2Br^(-) = Br2 + 2e^(-)

Water (H2O) and carbon dioxide (CO2) are two common compounds that include oxygen.

They are both 'Common'.!!!!

Water is a compound

Air is a mixture.

Acid ; Hydrochloric Acid

Base ; Sodium hydroxide.

Here is the balanced chemical reaction.

HCl(aq) + NaOH(aq) = NaCl(aq) + H2O(l)

NO!!!

Here are the general acid reaction.

Acid + Base = Salt + Water

Acid + Alkali = Salt + Water

Acid + metal = Salt + Hydrogen

Acid + Carbonate = Salt + Water + Carbon Dioxide.

NB In none of then is oxygen produced.

NNB The salt is a chemical salt of the form (MA) of which table salt is one. 'M' being the metal cation and 'A' acid anion.

THere are several nitrogen/oxygen compounds.

Viz.,

NO2 ; Nitrogen dioxide (Oxid'n state 4)

NO ; Nitrogen monoxide (Oxid'n state 2)

N2O ; Nitrous oxide (Laughing gas). (Oxid'n state 1)

The different is in the oxidation state of nitrogen , as given alongside each.

Only WATER (H2O) .

Compounds are molecules that contain atoms of different elements.

Nitrogen (N2) , Oxygen(O2) and Hydrogen(H2) are molecules, but NOT compounds, because they only contain atoms of one element.

Oxygen (O2) is a MOLECULE of two atoms of the element oxygen. It is found in the atmosphere.

Water(H2O) is a compound. It is a combination of two atoms of hydrogen and one atom of oxygen.

NB A compound is a molecule that contains atoms of two or more different elements.

So both Water and Oxygen are molecules.

However, only water, in this case, is a compound.

Hexane is both Organic, an Hydrocarbon and an alkane.

Organic because it contains carbon. in the structure.

Hydrocarbon because it contains only atoms of the elements hydrogen and carbon.

An Alkane because it only has single bonds between carbon .

In the nomenclature (naming system) ' Hex' '6' carbons and '--ane' an alkane..

Structurally, hexane is ' CH3-CH2-CH2-CH2-CH2-CH3 '.

Yes, a compound with the chemical formula C15H30 would be a member of the alkane series. Alkanes have the general formula CnH2n+2, where n represents the number of carbon atoms in the alkane molecule. In this case, n=7, so the compound falls into the alkane series.

An ALK**Y**NES

Structurally, ' R - C///C - R'