PRELESSON FOR NEW RSBI STUDENTS 2009 Part I

1. All substances have mass and therefore must be composed of ….
a. atoms
b. waves
c. protons
d. neutrons
e. electrons
2. Atoms and how they assemble themselves in the substance determines their properties. These properties are ….
a. boiling point
b. melting point
c. physical
d. chemical
e. physical and chemical
3. Substances can be classified according to how these atoms are assembled and is known as Classification of Matter: The category (ies) of this classification is (are) ….
(1) elements
(2) compounds
(3) mixtures
a. (2) only
b. (1) and (2)
c. (1) and (3)
d. (2) and (3)
e. (1), (2), and (3)
4. Furthermore, mixtures can be classified as ….
a. homogeneous and heteroogeneous
b. solution and aqueous solution
c. gas, liquid, and solid
d. colloid and solution
e. solid and liquid
5. The classification of matter depends upon how we try and separate matter into its basic components. This separation is called the "process". There are two processes, that are ….
a. physical and chemical
b. evaporation and coagulation
c. condensation and combustion
d. dillution and dissolving
e. destilation and separation
6. One of the following substances is an element. This is ….
a. sugar
b. carbon
c. water
d. sand
e. oil
7. Vinegar, sand, and water can be classified as ….
a. element, mixture, and compound
b. compound, element, and mixture
c. element, compound, and element
d. compound, mixture, and compound
e. mixture, compound, and mixture
8. The example of homogeneous mixture is ….
a. wood
b. water in the river
c. water in the sea
d. oil and water
e. sugar in water
9. Pure substance is ….
a. a mixture
b. an element or a a compound
c. a colloid or a suspension
d. a homogeneous mixture
e. a heterogeneous mixture
10. A substance can be separated into two simple substances by using a physical process. This substance is ….
a. compound
b. colloid
c. mixture
d. element or compound
e. colloid or mixture
11. A substance can not be separated by using physical process, however it can be burnt and produces carbon dioxide and water. This substance can be classified as ….
a. compound
b. colloid
c. element
d. homogeneous mixture
e. heterogeneous mixture
12. Any substance that contains only one kind of an atom is known as ….
a. element
b. compound
c. particle
d. mixture
e. colloid
13. The following are elements. The correct answer is ….
a. iron and salt
b. phosphorus and sulfur
c. salt and metal
d. water and oil
e. alcohol and non metal
14. Elements such as phosphorus (P4) or sulfur (S8) cannot be broken down into simpler substances by any reaction, because these are ….
a. smallest particle
b. compound
c. smallest compound
d. mixture
e. simple mixture
15. Water is a compound, so its components can be separated by using a chemical process. It decomposes into a mixture of ….
a. hydrogen and carbon
b. carbon and oxygen
c. hydrogen and oxygen
d. oxygen and helium
e. carbon and helium
16. Each element is represented by a unique symbol. The notation for each element can be found on the periodic table of elements. The correct symbols of iron, zink, and sulfur are ….
a. F, Z, S
b. Fe, Zn, S
c. Be, Zi, Su
d. Ir, Zn, Sl
e. Ir, Zn, S
17. The elements can be divided into three categories that have characteristic properties. These are ….
(1) metals
(2) nonmetals
(3) semimetals
a. (1) only
b. (1) and (2)
c. (1) and (3)
d. (2) and (3)
e. (1), (2), and (3)
18. The correct metals, semimetals, and nonmetals are ….
a. cooper, carbon, and sulfur
b. iron, zink, and yodine
c. calcium, silicon, and chlorine
d. barium, boron, and bromine
e. sodium, potassium, phosphorus
19. Most elements are metals, which are found on the left and toward the bottom of the periodic table. Examples of metals are ….
a. fluorine, chlorine, bromine, yodine
b. calcium, barium, potassium, sodium
c. phosphorus, sulfur, oxygen, hydrogen
d. carbon, berilium, nickel, boron
e. zink, cooper, aluminium, helium
20. Elements are made up of atoms, the smallest particle that has any of the properties of the element.John Dalton, in 1803, proposed a modern theory of the atom based on the following assumptions.
1. Matter is made up of atoms that are indivisible and indestructible.
2. All atoms of an element are identical.
3. Atoms of different elements have different weights and different chemical properties.
4. Atoms of different elements combine in simple whole numbers to form compounds.
5. Atoms cannot be created or destroyed. When a compound decomposes, the atoms are recovered unchanged.
The correct answer are ….
a. 1, 2, 3
b. 2, 3, 4
c. 2, 3, 4
d. 1, 2, 4, 5
e. 1, 2,3, 4, 5

21. Elements combine to form chemical compounds that are often divided into two categories. Metals often react with nonmetals to form … compounds.
a. ionic
b. simple
c. neutral
d. covalent
e. molecular
22. Ionic compounds are composed of ….
a. positive ions and cations
b. negative ions and anions
c. cations and anions
d. cations
e. anions
23. Table salt is formed from neutral atoms, Na and Cl2 molecules:

The correct statement about this salt is ….
a. a molecular compound
b. formed from metal and nonmetal
c. consists of atoms and molecules
d. contains positive charge
e. liquid at room temperature
24. Nonmetals combine with each other to form a compound. The correct statement about this compound is ….
a. an ionic compound
b. a neutral molecule
c. consists of the same atoms
d. the smallest particle is ions
e. contains ions which have no charge
25. The characteristic of a covalent compound is ….
a. has a high boiling point
b. consists of different ions
c. molecule is the smallest particle
d. can be formed between metals
e. there is an attraction between ions
26. One of the following properties of ionic compounds is ….
a. high melting point
b. low boiling point
c. react with water
d. this solid conducts electricity
e. at room temperature it acts as a gas
27. The law of constant composition states as follow, except ….
a. the ratio by mass of the elements in a chemical compound is always the same
b. this law can be used to distinguish between compounds and mixtures
c. brass is a mixture of copper and zinc which have a variation composition
d. compounds and mixture have a constant composition
e. water is always 88.8% O and 11.2% H by weight
28. An oxide of nitrogen is found to contain 36.8% nitrogen by mass. The empirical (simplest) formula for the oxide is …. (Ar N = 14, O = 16)
A. NO
B. NO2
C. N2O
D. N2O3
E. N2O5
29. The difference between compounds and mixtures of elements is the ease with which the elements can be separated. The correct statement is ….
a. atmosphere is a compound
b. compounds are easy to separate
c. mixtures are contain two or more substances
d. mixture can be physically separated from each other
e. to separate components of atmosphere, we should use chemical reaction
30. Atoms are neutral particle. This is because of ….
a. neutrons is neutral
b. positive charge of nucleus
c. negative charge of electrons
d. protons and neutrons in the nucleus
e. the same number of protons and electrons