Chemistry Class # 9 Ch # 1 Quiz # 3 Updated: 09 May 2020 671 Welcome to your Chemistry Class # 9 Ch # 1 Quiz # 3 1. Average atomic mass is the weighted average of the atomic masses of the naturally occurring __________ of an element. Molecules Isotopes Atomic number None of these None 2. Mass number of Oxygen atom is 19 34 16 14 None 3. Mass number is equal to the sum of number of protons + number of ___________. Electrons Atoms Neutrons Elements None 4. The number of proton present in the nucleus of an atom is called ____________ mass number atomic number both of them none of them None 5. Atomic number is represented by _____ Q Z M A None 6. Examples of heterogeneous mixture is Sand Glucose Dirt both dirt and sand None 7. A mixture having uniform composition throughout its mass is called Heterogeneous mixture Homogeneous mixture Both of them None of them None 8. Example of homogeneous mixture is sand dirt NaCl dissolved in water Petrol None 9. Chemical formula of bleaching powder is CaO NaCl HCl CaOCl2 None 10. Chemical name of caustic soda is sodium chloride methane sodium hydroxide Kerosene None 11. The symbol of Gold is Go Gu Al Au None 12. __________ is generally known as the father of Chemistry. Al Beruni Al Farabi Ibne Sina Jabber Ibne Haiyan None 13. Distillation is a chemical method which were introduced by _______ Greeks Romans Muslims None of them None 14. Atomic mass unit is the mass of 1/12 of the mass of any atom of Gas Carbon-12 Gold Iron None 15. Number of naturally occurring elements are 52 82 42 92 None 16. The symbol of Fluorine is Fl Fu F Fe None 17. Each element consists of only ______ kind of atoms. One Three Four Two None 18. The symbol of lead is L Le Pb La None 19. The chemical formula of Sodium nitrate is NaCl NaNO3 NaHCl CH4 None 20. A widely used example of mixture is __________ Glass Rubber Plastic Alloys None Time's up
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