Atoms, elements and molecules

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1. The volume of the atom is mainly made up of
A) space B) protons C) neutrons D) electrons E) the nucleus

2. Which one of the following atoms contains the greatest number of neutrons.
A) Sodium with an atomic mass number of 23 and an atomic number of 11 B) Potassium with an atomic mass number of 39 and an atomic number of 19 C) Chlorine with an atomic mass number of 35 and an atomic number of 17 D) Carbon with an atomic mass number of 12 and an atomic number of 6 E) Argon with an atomic mass number of 40 and an atomic number of 18

3. The atomic number of an atom is :
A) the number of electrons in the nucleus B) the number of neutrons in the nucleus C) the sum of neutrons and protons in the nucleus. D) the number of neutrons orbiting around the nucleus. E) the number of protons in the nucleus.

4. A molecule of carbon dioxide has the chemical formula CO2. Which one of the statements below is true?
A) One carbon dioxide molecule is composed of one carbon atom and one oxygen atom. B) One carbon dioxide molecule is composed of two carbon atoms and two oxygen atoms. C) One carbon dioxide molecule is composed of four atoms. D) One carbon dioxide molecule is composed of three carbon atoms and six oxygen atoms. E) One carbon dioxide molecule is composed of one carbon atom and two oxygen atoms.

5. The mass of the atom is primarily made up of:
A) its electrons; B) its protons and neutrons; C) its neutrons; D) its electrons and neutrons; E) its protons only.

6. An element with atomic number 17 is found in
A) group 1 of the periodic table. B) group 7 of the periodic table. C) group 8 of the periodic table. D) group 5 of the periodic table. E) group 3 of the periodic table.

7. The atom is formed from subatomic charged particles. Which comment below is true?
A) Protons have a positive charge. B) Protons and neutrons both have a positive charge. C) Neutrons and electrons have a negative charge. D) Neutrons only have a negative charge. E) Electrons have a positive charge.

8. Two clear solutions are mixed together as shown on the right. Is this a chemical reaction?
A) This is a chemical reaction as indicated by the colour change. B) This is not a chemical reaction. C) This is a physical change. D) This is not a chemical reaction because no new product is formed. E) This is not a chemical reaction because no gas is formed.

9. Everything around you is made of matter. Most examples of matter can be classified into the following main groups
A) gases and liquids only. B) solids and gases only. C) liquids only. D) liquids, gases and solids. E) liquids and solids only.

10. The chemical symbol for gold is
A) Au B) G C) Go D) Gd E) Ag

11. The chemical symbol for silver is
A) Au B) Sr C) S D) Si E) Ag

12. Which element has the chemical symbol "Si"?
A) Strontium B) Silicon C) Sulfur D) Scandium E) Sintinium

13. The chemical symbol for helium is
A) Hi B) H C) Hl D) Hm E) None of the above represent the chemical symbol for helium.

14. The chemical symbol for sodium is
A) Sm B) S C) Na D) Mg E) So

15. Sulfuric acid has the formula H2SO4. What are the elements that form sulfuric acid?
A) Helium, sulfur and oxygen. B) Helium, strontium and oxygen. C) Hydrogen, strontium and oxygen. D) Hydrogen, sulfur and oxygen. E) Helium, sulfur and cobalt.

16. The image on the right represents the nucleus of an atom of element "X". The red spheres represent protons while the yellow spheres represent neutrons. Which one comment below is true?
A) Element "X" has the atomic number 10. B) Element "X" has a mass number of 10 and the atomic number 5. C) Element "X" has a mass number of 5 and the atomic number 10. D) Element "X" has a mass number of 5 and the atomic number 5. E) Element "X" has a mass number of 5.

17. The particles of a substance are shown on the right. The substance is a:
A) solid at a moderate temperature. B) gas at very high temperatures. C) gas at very low temperatures. D) liquid that has reached its boiling temperature. E) liquid at low temperatures.

18. The water molecule can also be correctly called a compound because:
A) its elements contain the same number of outer-shell electrons; B) it has three different types of atoms; C) it has two different types of atoms; D) it is a liquid at room temperature; E) it boils at 100oC

19. During a chemical reaction:
A) atoms or groups of atoms are rearranged to form new products. B) new atoms are formed. C) some atoms are destroyed to create new elements. D) new products are formed with the creation of new atoms. E) a colour change always occurs.

20. During some chemical reactions:
A) atoms decrease in atomic mass. B) atoms increase in atomic mass. C) electrons may be transferred from one atom to another. D) protons may be transferred from one atom to another. E) neutrons may be transferred from one atom to another.