Who was the first scientist to hold a chemistry experiment in a laboratory? a) Democritus b) Antoine Lavoiser c) Jabir Ibnay Hiyan d) John Dalton Answer: c) Jabir Ibnay Hiyan
What are medieval researchers called? a) Alchemist b) Alchemi c) Kimia d) Al-Karia Answer: a) Alchemist
Who is the father of modern chemistry? a) John Dalton b) Robert Boyal c) Antony Lavoisiere d) Neils Bohr Answer: c) Antony Lavoisiere
The word Al-Chemy represents which civilization? a) Shindhu b) Egyptian c) Western d) Indian Answer: b) Egyptian
The word “Alchemy” comes from which language? a) Bengali b) Persian c) English d) Arabic Answer: d) Arabic
Which type of word is Al-chemy? a) Egyptian b) Urdu c) Arabian d) English Answer: c) Arabian
Why was there a need to arrange different elements in rows? There are enough similarities in the properties of different elements. It will be easier to learn about the different properties of an element by classifying different elements in similar groups. This is why there was a need to arrange different elements in rows.
The physical and Chemical properties of elements return periodically as the atomic mass of elements increases. Dmitri Mendeleev’s periodic law, proposed in 1869, states that the properties of elements are periodic functions of their atomic weights. In simpler terms, as you arrange elements in order of increasing atomic weight, their properties repeat in a predictable … Read more