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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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