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\# Let's calculate the volume ratio for diluting 12% hydrogen peroxide to 9% hydrogen peroxide using C1V1 = C2V2

\# C1 = 12%

\# C2 = 9%

\# Let final volume V2 = 100 mL

\# 12 * V1 = 9 * 100

V1 = (9 * 100) / 12

water_added = 100 - V1

print(f"Peroxide volume: {V1} mL")

print(f"Water volume: {water_added} mL")

Peroxide volume: 75.0 mL

Water volume: 25.0 mL

To dilute a **12%** hydrogen peroxide solution down to **9%**, use a **3:1 ratio** (3 parts 12% peroxide to 1 part water).

Example (to make 100 ml of 9% solution):

• Mix **75 ml** of 12% hydrogen peroxide

• Add **25 ml** of distilled water

(Formula: Take 3 parts of your 12% solution and add 1 part water).

'dm^(3)' is a measure of liquid volume.

'dm^(3( ' means decimetres cubed.

It is the same volume as litres.

1 dm^(3) = 1 litre.

It is used in chemistry labs. when completing volumetric analysis.

Water displacement is used to measure the volumn of an irregular shaped object. If a Bowling ball was immersed in water, you could use the difference in the before and after water amount to give you the mass of the object inserted.

The metal that melts at 90 degrees Celsius is gallium.

Bunsen Burners. Invented by Robert Bunsen, who was a German, in the 19th Century.

They are an upright tube, with a flat 'spout' at the top, from which the gas is burned(flame).

. At the base is a tube for the gas inlet, and also anair hole to change the heat level,.

Closed ; cool yellow slack flame . Open, ; hot, blue/clear roaring flame.

Ethanoic( Acetic( Anhydride has the stricture.

CH3 - C(=O)-O-C(=O)-CH3

The single C-O bond can break.

Giving an acid radical and an aldehyde radical.

Both radicals react with water to form ethanoic acid.

Epoxy resin is a non-metal. It is a type of polymer material that is composed of organic molecules, typically containing carbon, hydrogen, and oxygen atoms.

Yes, epoxy resin is considered a type of plastic material.

Yes, epoxy resin is considered a type of plastic.

Yes, epoxy is considered a type of plastic.

A chlorine burn appears as redness, irritation, and blistering on the skin. It can be identified by a strong smell of chlorine, skin irritation, and possible discoloration of clothing or surfaces in contact with the chemical.

Magnesium and chlorine will react directly with each other.

Here is the balanced reaction eqution.

Mg(s) + Cl2(g) = MgCl2(s) .

The product is named 'magnesium chloride'.

By reading the correct formula, which you have given. There is;-

1 atom of magnesium (Mg)

2 atoms of chlorine ( Cl2)

This is the whole point of chemical formulae; you can tell how many of each type of atom are present.

Here is another example.

H2SO4 ( Sulphuric Acid)

2 atoms of hydrogen

1 atom of sulphur

4 atoms of oxygen.

et seq.,

' cl- ' is nothing. . It does not mean a thing.

However, if you mean ' Cl^(-) ' or 'Cl-' Then it is NOT an atom . It is an ION, and more correctly an 'ANION'.

NB For ALL chemical elemental symbols the first letter is ALWAYS a CAPITAL letter. Hence 'Cl/Cl^(-)' not 'cl-'.

NB An atom is a neutrally charged species. The number of protons is balanced by the same number of electrons.

An ion carries a positive/negative charge. The number of electrons differed from the number of protons.

So ' Cl ' is an ATOM , but ' Cl^(-) ' is an ION .

Any atom that carries a charge is no longer an atom but an ion.

Positively charged ions are named 'CATIONS'.

Negatively charged ions are named ' ANIONS'.

Sulphur , per se , is the name of an element. . It exists as atoms.

When in ionic form

S^(2-) ; Sulphide ; As hydrogen sulphide ( H2S)

SO3^(2-) ; Sulphite ; As copper sulphite ( CuSO3)

SO4^(2-) ; Sulphate ; As Copper sulphate ( CuSO4)

Note; Careful, in these ionic forms there is only ONE letter difference in the spelling.

Gamma rays

Using the Avogadro Number, of 6.022 x 10^(23) = one mole

Dividing

3.6000 x 10^(24) / 6.022 x 10^(23) = 5.97808.... moles.

Using a copy of the Periodic Table, showing the Atomic Masses.

MgBr2

1 x Mg = 1 x 24 = 24

2 x Br = 2 x 80 = 160

24 + 160 = 184 the Mr ( Relative Molecular Mass) of tne molecule of MgBr2

Using the equation.

moles = mass(g) / Mr

Then mass(g = moles X Mt

So for '7' moles

mass(g) = 7 x 184 = 1288 g = 1.288 kg ( kilograms).

Two(2).

They are ' Br^(2) ' . The terminal '2' indicates that there are two anions.

NB

Collectively they are IONS .

Positively charged ions are ' CATIONS'. M^(n+)

Negatively charged ions are ' ANIONS'. X^(n-)

MgBr2 =

Mg^(2+) ' positively charged cation

2Br^(-) ' negatively charged anions.

For an ionic compound to be neutral , the charged MUST balance and be opposite. (+/-)

Hence MgBr2 = 2+ for magnesium and "2 x -1 = -2 ' for the two bromines.

Hence + 2 - 2 = 0

In 'mgbr2' there are NO elements.

If you mean ' MgBr2'.

Then the elements are ;-

Magnesium (Mg)

Bromine (Br)

NB When writing chemical formulae, be it one or two letter symbol, the first letter is ALWAYS a CAPITAL letter. Hence my 'NO' for lower case letters.

MgBr2 is magnesium bromide. It is a combination of one cation ( atom) of magnesium and two anions( atoms of bromine.

Iodine , be it solid, liquid, or gas is an ELEMENT.

It appears in the Periodic Table.

Its mormal chracteristics are ; -

Iodine ( I )

Category ; Halogen

Atomic No. 53

Atomic mass ' 126.9

Phase ; Solid ( at STP).

Colour ; Black

M .P. 114 oC

B.P. ; 184 oC

Crystal structure ; Orthorhombic.

YES!!!

'-CH3' is the methyl functional group

Found on 'toluene'

C6H5-CH3

OctanAl is an aldehyde.

Structural formula is

CH3-CH2-CH2-CH2-CH2-CH2-CH2-C(=O)-H

Do NOT confuse with OctanOL, which is an alcohol

Structural formula is

CH3-CH2-CH2-CH2-CH2-CH2-CH2-CH2-O-H

NB There is only ONE letter difference in the name ; 'O' for 'A'.

NNB Formula writing of aldehydes is R-CHO , and the formula writing of alcohols is R-CH2OH.

This is the international IUPAC Standard for indicating these functional groups.

Iron is a metallic Element.

It forms numerous alloys, the most well known one being 'Steel'.

Steel is a MIXTURE of iron and carbon. The carbon component is of very low percentage ; less than 2% .