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Lana71 [14]
2 years ago
7

How metals have been used thorough the ages PLS

Chemistry
1 answer:
Ilya [14]2 years ago
8 0

1751 - Nickel
1774 - Manganese
1781 - Molybdenum
1782 - Tellurium
1783 - Tungsten
1789 - Uranium
1789 - Zirconium
1791 - Titanium
1794 - Yttrium
1797 - Berylium
1797 - Chromium
1801 - Niobium
1802 - Tantalum
1803 - Iridium, Palladium, Rhodium
1807 - Potassium, Sodium
1808 - Boron, Barium, Calcium, Magnesium, Strontium
1814 - Cerium
1817 - Lithium, Cadmium, Selenium
1823 - Silicon
1827 - Aluminium
1828 - Thorium
1830 - Vanadium
1839 - Lanthanum
1843 - Erbium, Terbium
1844 - Ruthenium
1860 - Cesium, Rubidium
1861 - Thallium
1863 - Indium
1875 - Gallium
1878-1885 - Holmium, Thulium, Scandium, Samarium, Gadalinium, Praseodynium, Neodynium, Dysprosium
1886 - Germanium
1898 - Polonium, Radium
1899 - Actinium
1901 - Europium
1907 - Lutetium
1917 - Protactinium
1923 - Hafnium
1924 - Rhenium
1937 - Technetium
1939 - Francium
1945 - Promethium
1940-61 - Transuranium elements – (Neptunium, Plutonium, Curium, Americum, Berkelium, Californium, Einsteinium, Fermium, Mendelevium, Nobelium, Lawrencium)
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Explanation:

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3 years ago
To find pH of hydrochloric acid.
Verdich [7]

Answer:

1.22

Explanation:

Step 1:

We'll begin by writing the balanced equation for the reaction. This is given below:

HCl + KOH —> KCl + H2O

From the balanced equation above,

The mole ratio of acid (nA) = 1

The mole ratio of base (nB) = 1

Step 2:

Data obtained from the question. This includes the following:

Volume of acid (Va) =

(62.35 + 62.40)/2 = 62.38 mL

Molarity of acid (Ma) =.?

Volume of base (Vb) = 25 mL

Molarity of base (Mb) = 0.150M

Step 3:

Determination of the molarity of the acid.

This is illustrated below:

MaVa/MbVb = nA/nB

Ma x 62.38/ 0.15 x 25 = 1

Cross multiply to express in linear form

Ma x 62.38 = 0.15 x 25

Divide both side by 62.38

Ma = (0.15 x 25) /62.38

Ma = 0.06M

The molarity of the acid is 0.06M

Step 4:

Determination of the concentration of Hydrogen ion, [H+] in the acid. This is illustrated below:

Hydrochloric acid (HCl) will dissociate to produce hydrogen ion as follow:

HCl —> H+ + Cl-

From the above equation,

1 mole of HCl produced 1mole of H+.

Therefore, 0.06M HCl will also produce 0.06M H+.

The concentration of Hydrogen ion, [H+] is 0.06M

Step 5:

Determination of the pH of HCl. This is illustrated below:

pH = – Log [H+]

[H+] = 0.06M

pH = – Log 0.06

pH = 1.22

Therefore, the pH of HCl is 1.22

5 0
3 years ago
Why should the mole to mole ratio be a whole number ratio?​
muminat

Answer: The mole to mole ratio are the stoichiometric factors of the chemicals in your balanced reactions and are always in whole numbers. When we balance a chemical reaction, whole numbers are always used for easy convention.

Explanation:

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