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Chemistry
(The chemical subject) Introduction •	In this topic mean chemistry, we learn what is chemistry. •	Who is the of chemistry also we will learn. •	What is chemistry? And it purposes. == H stand for hydrogen 2 stand for two atoms of hydrogen O stand for oxygen.

In Chemicals the elements will that place. Without elements the chemical will not form. Example: water.

Periodic table Now, it time to learn about periodic table. We can see all elements in the periodic table. They are 118 elements in periodic table.

1.	hydrogen

2.	helium

3.	lithium

.	beryllium

5.	boron

6.	carbon

7.	nitrogen

8.	oxygen

9.	fluorine

10.	neon

11.	sodium

12.	magnesium

13.	aluminium 1

4.	silicon

15.	phosphorus

16.	sulfur

17.	chlorine

18.	Argon

19.	Potassium

20.	Calcium

21.	scandium

22.	Titanium

23.	Vanadium

24.	Chromium

25.	Manganese

26.	Iron

27.	Cobalt

28.	Nickel

29.	Copper

30.	Zinc

31.	Gallium

32.	Germanium

33.	Arsenic

34.	Selenium

35.	Bromine

36.	Krypton

37.	Rubidium

38.	Strontium

39.	yttrium

40.	zirconium

41.	niobium

42.	molybdenum

43.	technetium

44.	ruthenium

45.	rhodium

46.	palladium

47.	sliver

48.	cadmium

49.	indium

50.	tin

51.	antimony

52.	tellurium

53.	lodine

54.	xenon

55.	caesium

56.	barium

57.	lanthanum

58.	cerium

59.	praseodymium

60.	neodymium

61.	promethium

62.	samarium

63.	europium

64.	gadolinium

65.	terbium

66.	dysprosium

67.	holmium

68.	erbium

69.	thulium

70.	ytterbium

71.	lutetium

72.	hafnium

73.	tantalum

74.	tungsten

75.	rhenium

76.	osmium

77.	lridium

78.	platinum

79.	gold

80.	mercury

81.	thallium

82.	lead

83.	bismuth

84.	polonium

85.	astatine

86.	radon

87.	francium

88.	radium

89.	actinium

90.	thorium

91.	protactinium

92.	uranium

93.	neptunium

94.	plutonium

95.	americium

96.	curium

97.	berkelium

98.	californium

99.	einsteinium

100.	fermium

101.	menbelium

102.	nobelium

103.	lawrencium

104.	rutherforddium

105.	dubnium

106.	seaborgium

107.	bohrium

108.	hassium

109.	meitnerium

110.	darmtadtium

111.	roentgenicium

112.	copernicium

113.	ununtrium

114.	flerovium

115.	ununpentium

116.	livermorium

117.	ununseptium

118.	Ununoctium.

Types of chemicals 5 Main Types of Chemical Reactions •

Synthesis reaction. Narrow definition. The other meaning of chemical synthesis is narrow and restricted to a specific kind of chemical reaction, a direct combination reaction, in which two or more reactants combine to form a single product. The general form of a direct combination reaction is: A + B → AB.

•	Decomposition reaction. Chemical decomposition, analysis or breakdown is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds. Chemical decomposition is usually regarded and defined as the exact opposite of chemical synthesis.

•	Single displacement reaction. A single-displacement reaction, also known as a single-replacement reaction, is a type of chemical reaction where an element reacts with a compound and takes the place of another element in that compound. This type of reaction is typically pictured like this: Here, A replaces B in the compound BC

•	Double displacement reaction. •	•	•	Double displacement reactions generally take place in aqueous solutions in which the ions precipitate and there is an exchange of ions. For example, on mixing a solution of barium chloride with sodium sulphate, a white precipitate of barium sulphate is immediately formed. These reactions are ionic in nature

•	Combustion reaction. Burning wood in a fire is an example of a combustion reaction. In the combustion reaction, the carbohydrates in wood combine with oxygen to form water and carbon dioxide. This reaction is very energetic, and it generates heat and light as it releases that energy. •	Combination. A combination reaction (also known as a synthesis reaction) is a reaction where two or more elements or compounds (reactants) combine to form a single compound (product). Such reactions may be represented by equations of the following form: X + Y → XY.

•	Redox Redox is a chemical reaction in which the oxidation states of atoms are changed. Any such reaction involves both a reduction process and a complementary oxidation process, two key concepts involved with electron transfer processes.