JS 2 Chemistry - First Term Exam
- 1. 1. The word "atom" comes from a greek word which is --------
A) Atomos
B) Toms
C) Atom
D) Atomas
- 2. 2. ---------- is the smallest particles of an element that could exist and still posses the chemical properties.
A) Neutron
B) Proton
C) Atom
D) Electron
- 3. 3. ---------is defined as any substance that has mass and occupied space.
A) Solid
B) Atom
C) Gas
D) Matter
- 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) Compound
B) Atom
C) Molecules
D) Element
- 5. 5. ---------- is formed when two or more atoms are chemically combined together.
A) Radicals
B) Molecules
C) Elements
D) Compounds
- 6. 6. ---------- is the number of protons present in the atomic nucleus of the element.
A) Charges
B) Mass number
C) Atomic number
D) Molecular number
- 7. 7. The following are the sub-atomic particles of atom except
A) Nucleus
B) Proton
C) Neutron
D) Electron
- 8. 8. One of the following is a type of ion.
A) Cation
B) Anode
C) Anhydrous
D) Cathode
- 9. 9. A positively charged ion is known as --------
A) Cathode
B) Anode
C) Anion
D) Cation
- 10. 10. A negatively charged ion is called -------
A) Cation
B) Cathode
C) Anode
D) Anion
- 11. 11. The sum of the protons and neutrons in the atomic nucleus of an element is called -------
A) Symbol of the element
B) Atomic number
C) Mass number
D) Chemical equation
- 12. 12. --------- are atoms with the same atomic numbers but different mass numbers
A) Isotopes
B) Chemical reaction
C) Atomicity
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) Chemical equation
B) Chemical reaction
C) Reactants
D) Products
- 14. 14. Calculate the pH of a solution with 0.002M concentration of HNO3.
A) 4
B) 5
C) 3
D) 6
- 15. 15. --------- is defined as the negative logarithm of the hydrogen ion to the base of 10.
A) pH
B) Acidity
C) Alkalinity
D) Neutrality
- 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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