Chem Extra

Question 1

The law of conservation of mass

Answer 1

Chemical reaction in mass is neither created nor destroyed

Question 2

The law of conservation of energy

Answer 2

The amount of energy is neither created nor destroyed

Question 3

Law of multiple proportions

Answer 3

When two elements combine to form more than one compound, the mas of one element, which combines with a fixed mass of the other element, will always be ratios of whole numbers

Question 4

Law of constant composition

Answer 4

A given chemical compound always has its component elements in fixed ratio and does not depend on its source and method of preparation

Question 5

Marie curie

Answer 5

Study of radiation

Question 6

John dalton

Answer 6

Law of conservation of mass, law of definite proportions, atomic theory

Question 7

Henry Mosley

Answer 7

Atomic numbers, x ray

Question 8

Antione be quarrel

Answer 8

Radioactivity

Question 9

Gold foil experiment

Answer 9

Rutherford, atom empty space and charges of protons etc

Question 10

Oil drop experiment

Answer 10

Size of charge of electron, Robert Millikan

Question 11

Cathode ray tube observation

Answer 11

Plum pudding model, existence elf electrons and that they were negative j Thompson

Question 12

Cyclotron

Answer 12

Radioactive isotopes Marie curie

Question 13

Which radio active particle is the most massive

Answer 13

Alpha

Question 14

Which is medium sized radioactive particle

Answer 14

Beta

Question 15

Which is smallest radioactive particle

Answer 15

Gamma

Question 16

Daltons atomic theory

Answer 16

Law of conservation of mass and law of definite proportions could be used to explain the idea of atoms

Question 17

Derived units

Answer 17

Area, volume, density, energy, speed, acceleration, pressure, force, frequency,power, voltage, charge