Chemistry - some basic concepts of chemistry chapter 1 class 11

Question 1

10^–24

Answer 1

yocto(y)

Question 2

10^–21

Answer 2

zepto(z)

Question 3

10^–18

Answer 3

atto(a)

Question 4

10^–15

Answer 4

femto(f)

Question 5

10^–12

Answer 5

pico(p)

Question 6

10^–9

Answer 6

nano(n)

Question 7

10^–6

Answer 7

micro(µ)

Question 8

10^–3

Answer 8

milli(m)

Question 9

10^–2

Answer 9

centi(c)

Question 10

10^–1

Answer 10

deci(d)

Question 11

10

Answer 11

deca(da)

Question 12

10^2

Answer 12

hecto(h)

Question 13

10^3

Answer 13

kilo(k)

Question 14

10^6

Answer 14

mega(M)

Question 15

10^9

Answer 15

giga(G)

Question 16

10^12

Answer 16

tera(T)

Question 17

10^15

Answer 17

peta(P)

Question 18

10^18

Answer 18

exa(E)

Question 19

10^21

Answer 19

zeta(Z)

Question 20

10^24

Answer 20

yotta(Y)

Question 21

Temperature conversion from Celsius to fahrenheit and kelvin

Answer 21

C = K − 273.15=(F − 32) × 5⁄9

Question 22

Law of Conservation of Mass

Answer 22

Antoine Lavoisier in 1789
Matter can neither be created nor destroyed

Question 23

Law of Definite Proportions

Answer 23

French chemist, Joseph Proust.
Compound always contains exactly the same proportion of elements by weight.

Question 24

Law of Multiple Proportions

Answer 24

Dalton in 1803.
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 the ratio of small whole numbers.

Question 25

Gay Lussac’s Law of Gaseous volumes

Answer 25

Gay Lussac in 1808. 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.

Question 26

Avogadro’s Law

Answer 26

1811, Avogadro Equal volumes of all gases at the same temperature and pressure should contain equal number of molecules.

Question 27

Dalton’s Atomic Theory

Answer 27

1808, Dalton published ‘A New System of Chemical Philosophy’ 1. Matter consists of indivisible atoms. 2. All atoms of a given element have identical properties, including identical mass. Atoms of different elements differ in mass. 3. Compounds are formed when atoms of different elements combine in a fixed ratio. 4. Chemical reactions involve reorganisation of atoms. These are neither created nor destroyed in a chemical reaction.explain the laws of chemical combination. -explain the laws of chemical combination.

Question 28

Drawbacks of Dalton's atomic theory

Answer 28

1.The laws of gaseous volumes. 2.The reason for combining of atoms.

Question 29

1 amu

Answer 29

1.66056×10^–24 g

Question 30

1 mole

Answer 30

6.022×10^23atom/mol Avogadro constant