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Posted by: Mr. Babatunde« on: February 20, 2020, 12:54:28 PM »The solution to [Chemisry II] Atom , Mole , Formulae And Equations set via our computer base test. 1. The combining power of an element or radical is ? A. Atom B. Radical C. Valency ✔ D. Mole 2. A group of atom that functions as a single unit in chemical reactions is ? A. Atoms B. Radical ✔ C. Ionic bond D. Valency 3. The smallest particle of an element which can take part in a chemical reaction is ? A. Atomicity B. Electrons C. Atoms ✔ D. Protons 4. Law of conservation of mass states that ? A. Two element combine to form more than one chemical compound B. All pure sample of a chemical compound contain similar element C. Matter can neither be created nor destroyed but changes from one form to another ✔ D. Matter is made up of discrete particles 5. How many moles are there in 20g of CaCO3 ? When ( CaCO3 = 100) A. 0.2 Mole ✔ B. 2 Mole C. 0.1 Mole D. 4 Mole 6. What is the mass of 3 mole of oxygen, gas O2 ? When (O = 16) A. 32g B. 46g C. 16g D. 96g ✔ 7. The number of time the average mass of one molecule of it is heavier than one-twelfth the mass of one atom of carbon-12 is ? A. Molar mass B. Atomic number C. Relative Molecular Mass ✔ D. Relative Atomic Mass 8. Any atom or group of atoms which possesses an electric charge is ? A. Atoms B. Ions ✔ C. Proton D. Valency 9. The smallest particles of a substance which exist alone and still retain the chemical properties of that substance is ? A. Molar mass B. Molecule ✔ C. Matter D. Atomicity 10. Calculate the RMM of limestone CaCO3 When ( Ca = 40 , C = 12 O = 16 ) A. 68 B. 204 C. 100 ✔ D. 120
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