- 1. 1. The word "atom" comes from a greek word which is --------
A) Atomas B) Atom C) Atomos D) Toms
- 2. 2. ---------- is the smallest particles of an element that could exist and still posses the chemical properties.
A) Electron B) Neutron C) Atom D) Proton
- 3. 3. ---------is defined as any substance that has mass and occupied space.
A) Matter B) Solid C) Atom D) Gas
- 4. 4. --------- is defined as the smallest particle of a substance that is capable of independent existence, and still retains the chemical properties of that substance.
A) Element B) Atom C) Compound D) Molecules
- 5. 5. ---------- is formed when two or more atoms are chemically combined together.
A) Compounds B) Molecules C) Radicals D) Elements
- 6. 6. ---------- is the number of protons present in the atomic nucleus of the element.
A) Mass number B) Atomic number C) Molecular number D) Charges
- 7. 7. The following are the sub-atomic particles of atom except
A) Nucleus B) Electron C) Proton D) Neutron
- 8. 8. One of the following is a type of ion.
A) Cathode B) Cation C) Anode D) Anhydrous
- 9. 9. A positively charged ion is known as --------
A) Anode B) Anion C) Cation D) Cathode
- 10. 10. A negatively charged ion is called -------
A) Anode B) Cathode C) Cation D) Anion
- 11. 11. The sum of the protons and neutrons in the atomic nucleus of an element is called -------
A) Mass number B) Chemical equation C) Atomic number D) Symbol of the element
- 12. 12. --------- are atoms with the same atomic numbers but different mass numbers
A) Atomicity B) Chemical reaction C) Isotopes D) Molecules
- 13. 13. The representations of chemical reactions in terms of the symbols and formulae of the elements and compounds involved is known as -------
A) Products B) Chemical reaction C) Chemical equation D) Reactants
- 14. 14. Calculate the pH of a solution with 0.002M concentration of HNO3.
A) 5 B) 6 C) 3 D) 4
- 15. 15. --------- is defined as the negative logarithm of the hydrogen ion to the base of 10.
A) Neutrality B) Alkalinity C) Acidity D) pH
- 16. 16. In a chemical equation, the substances at the left hand side are called --------
- 17. 17. In a chemical equation, the substances at the right hand side are called --------
- 18. 18. -----------is the part of an atom that is negatively charged.
- 19. 19. ------------- is the positively charged particle of an atom.
- 20. 20. The mass of neutron is ------------[type your answer in words]
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