Brief History and Flame Test

Question 1

Published 33 elements

Answer 1

Antoine Lavoiser

Question 2

Made the law of triad

Answer 2

Johann Wolfgang Dobereiner

Question 3

Used the law of triad and came up of 10 triads, able to identify 3 groups of four elements, 1 group of five.

Answer 3

Leopold Gmelin

Question 4

Described the relationships within groups of metals.

Answer 4

Jean-Baptiste Dumas

Question 5

Famous on studying carbon, said that it can hold four bonds.

Answer 5

August Kekule

Question 6

He proposed law of octaves.

Answer 6

John Newlands

Question 7

During Newlands time, how many elements are present?

Answer 7

56

Question 8

In 56 elements, how many groups are formed by Newland?

Answer 8

11

Question 9

They arranged the elements according to increasing atomic mass.

Answer 9

Dmitri Ivanovich Mendeleev and Julius Lothar Meyer

Question 10

Father of Modern Periodic Table

Answer 10

Henry Mosely

Question 11

Qualitative test used to identify the presence of particular metal / ion.

Answer 11

Flame Test

Question 12

Gas used in bunsen burner

Answer 12

Methane Gas

Question 13

Hot part of the flame

Answer 13

blue / non luminous flame

Question 14

Cold part of the flame

Answer 14

yellow / luminous flame

Question 15

Used to raise the height of flame

Answer 15

Barrel

Question 16

It allows air to enter the burner

Answer 16

air hole

Question 17

It is turned to open or close the airhole to obtain the required flame type

Answer 17

Collar

Question 18

Carries the gas from gas tap

Answer 18

Gas hose

Question 19

It is wide and heavy, to avoid toppling

Answer 19

Metal Base

Question 20

What flame is achieved in air hole open?

Answer 20

Blue

Question 21

What flame is achieved in air hole close?

Answer 21

Yellow