Chemistry Class # 9 Ch # 1 Quiz # 3 Updated: 09 May 2020 512 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 2. Mass number of Oxygen atom is 19 34 16 14 3. Mass number is equal to the sum of number of protons + number of ___________. Electrons Atoms Neutrons Elements 4. The number of proton present in the nucleus of an atom is called ____________ mass number atomic number both of them none of them 5. Atomic number is represented by _____ Q Z M A 6. Examples of heterogeneous mixture is Sand Glucose Dirt both dirt and sand 7. A mixture having uniform composition throughout its mass is called Heterogeneous mixture Homogeneous mixture Both of them None of them 8. Example of homogeneous mixture is sand dirt NaCl dissolved in water Petrol 9. Chemical formula of bleaching powder is CaO NaCl HCl CaOCl2 10. Chemical name of caustic soda is sodium chloride methane sodium hydroxide Kerosene 11. The symbol of Gold is Go Gu Al Au 12. __________ is generally known as the father of Chemistry. Al Beruni Al Farabi Ibne Sina Jabber Ibne Haiyan 13. Distillation is a chemical method which were introduced by _______ Greeks Romans Muslims None of them 14. Atomic mass unit is the mass of 1/12 of the mass of any atom of Gas Carbon-12 Gold Iron 15. Number of naturally occurring elements are 52 82 42 92 16. The symbol of Fluorine is Fl Fu F Fe 17. Each element consists of only ______ kind of atoms. One Three Four Two 18. The symbol of lead is L Le Pb La 19. The chemical formula of Sodium nitrate is NaCl NaNO3 NaHCl CH4 20. A widely used example of mixture is __________ Glass Rubber Plastic Alloys Time's up
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