Chemistry Exam

SECTION A MULTIPLE CHOICE QUESTIONS (1 mark for each question, 25 marks total)
ANSWER ON THE MULTIPLE CHOICE ANSWER SHEET 1. One difference between protons and neutrons is that A. protons are found in the nucleus of atoms. B. neutrons have no charge. C. protons have a much greater mass than neutrons. D. neutrons are found in shells orbiting the nucleus. The composition of two particles is given below. particle I particle II 22 protons 21 protons 22 neutrons 22 neutrons 20 electrons 20 electrons

2.

These particles would best be described as A allotropes B isotopes cations C D anions 3.
35

A B C D 4.
12

17Cl

contains 18 protons and 17 neutrons 17 protons and 18 neutrons 17 neutrons and 35 protons 35 neutrons and 17 protons

6C

and 146C are regarded as isotopes of the same element because their atoms have similar physical properties. their atoms have the same mass number. their atoms both have 6 protons in their nuclei. their atomic numbers differ.

A. B. C. D. 5.

Which of the following lists contains empirical formulae only? A B C D CH4, H2O, H2O2 CuSO4, C2H6, KMnO4 CH4, H2O, Na2Cr2O7 CO, CO2, C6H6

1

6.

According to the Pauli Exclusion Principle, the number of electrons which can occupy an orbital in an atom is A. B. C. D. 2, 8 or 18 depending on which orbital is being considered. 0, 1 or 2 2 only 8

7.

In which of the following compounds does nitrogen have the lowest oxidation number? A NH3 B NO C NO2 D N2O3 Lithium and Sodium have similar physical and chemical properties. This is best explained by the fact that both elements A B C D are metals. have the same outer shell electron configuration. have a low relative atomic mass. are in period 1 of the periodic table.

8.

9.

The formula of hydrated sodium carbonate (washing soda) is Na2CO3.10H2O. What amount of oxygen atoms is there in one mole of Na 2CO3.10H2O? A B C D 3 mol 4 mol 13 mol 16 mol

10.

Which of the following contains the greatest number of atoms? A...