كيمياء

Front 1

N

Back 1

14

Front 2

H

Back 2

1

Front 3

s

Back 3

32

Front 4

Na

Back 4

23

Front 5

Ca

Back 5

40

Front 6

Al

Back 6

27

Front 7

Cu

Back 7

64

Front 8

k

Back 8

39

Front 9

Mn

Back 9

55

Front 10

p

Back 10

31

Front 11

Cr

Back 11

52

Front 12

Zn

Back 12

65

Front 13

cl

Back 13

34.5

Front 14

f

Back 14

19

Front 15

fe

Back 15

56

Front 16

mg

Back 16

24

Front 17

Br

Back 17

80

Front 18

Li

Back 18

7

Front 19

what is Equivalent weight

Back 19

the equivalent of an element that reacts with one grame of hydrogen 8 grams of oxygen etc is knownas equivalent weight element

Front 20

Equivalent weight =

Back 20

atomic weight ÷ valence number

Front 21

valence number =

Back 21

atomic weight ÷ equivalent weight

Front 22

atomic weight =

Back 22

valence number × equivalent weight

Front 23

othar methods For finding equivalent weight

The equivalent weight of an element is Founol From Many chemical reactions

Back 23

1. Direct combination of hydrogen

2 -Displacement of hydrogen

3 -Direct combination oF oxygen

4 -Reduction the oxides

5 -Displacement of Metal by metal

Front 24

it was found the product of atomic weight and specific heat of an element is equal to 6.4

Back 24

.ووجد أن ناتج الوزن الذري والحرارة النوعية لعنصر يساوي 6.4

Front 25

reacts

Back 25

.

Front 26

define specific heat

Back 26

the specific heat of the element is the heat quantity that increases the temperature of 1 gram of the element by 1c

الحرارة النوعية للعنصر هي كمية الحرارة التي تزيد من درجة حرارة 1 غرام من العنصر بمقدار 1 سليزيوز