Chemistry
1-In Periodic table vertical columns are called Groups
2-Alkali metals are reactive metals
3-Unreactive non metals are called Noble gases
4-Protons and Electrons are electrically charged
5-The relative charge of Proton and Electron is +1, -1
6- What is atomic number of an atom ? Ans- Number of protons
7- What is the mass number of an atom ? Ans- Total number of protons and neutrons
8-The atoms in a molecule are joined together by Covalent bond
9-Reactive metals are extracted by Electrolysis
10-Alkanes are Saturated Hydrocarbons
11-Polyunsaturated fats have many double bonds
12-The pH level is lower if concentration of hydrogen ions is greater.
13-The carbonate ores are changed into oxides by heating strongly in limited air.
This process is known as Calcination
14-Zinc oxide is called “philosopher’s” wool
15-The process of depositing a layer of zinc on iron is called Galvanization
16-An aqueous solution of copper sulphate is acidic in nature because the salt undergoes Hydrolysis
17-Non-metals form oxides which are either acidic or neutral
18- Xenon is also called as Stranger Gas
19-Glass can be etched or scratched by Diamond and Hydrofluoric acid
20-A change in which one or more new substances are formed is called Chemical change.
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