Some Basic Concepts of Chemistry

Question 1

Closeness of various measurements for the same quantity

Answer 1

Precision

Question 2

Agreement of a particular value to the true value of the result

Answer 2

Accuracy

Question 3

“Matter can neither be created nor destroyed”

Answer 3

Law of Conservation of Mass

Question 4

Law of Conservation of Mass was given by

Answer 4

Antonie Lavoisier

Question 5

“A given compound always contains exactly the same proportion of elements by weight”

Answer 5

Law of Definite Proportions OR
Law of Definite Composition

Question 6

Law of Definite Proportions was given by

Answer 6

Joseph Proust

Question 7

“If two elements can combine to form more than one compound the masses of one element that combine with a fixed mass of the other element are in ratio of small whole numbers”

Answer 7

Law of Multiple Proportions

Question 8

Law of Multiple Proportions was given by

Answer 8

Dalton

Question 9

“When gases combine or are produced in a chemical reaction they do so in a simple ratio by volume provided all gases are at the same temperature and pressure”

Answer 9

Gay Lussac’s Law of Gaseous Volumes

Question 10

“Equal volumes of all gases at the same temperature and pressure should contain equal number of molecules”

Answer 10

Avogadro’s Law

Question 11

Molarity

Answer 11

No of moles of solute/ volume of solution in litres

Question 12

Molality

Answer 12

No of moles of solute/mass of solvent in kg

Question 13

Avogadro’s constant

Answer 13

6.022 ×10^23