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11. Which of the following is the best way of differentiating clements and compounds?
a. Elements and compounds can be separated chemically
b. Elements are physically combined while compounds are chemically combined
c. Elements simple substances while compounds are complex substances
d. Elements are made of only one kind of atom while compounds are made up of two or more kinds of atoms.
12 Which of the following substances is classified as compound?
a Hydrogen b Ozone c Sulfur d Water
13 Which of the following terms most accurately describes carbon dioxide?
a Compound c. Mixture b. Element d Solution
14 In water molecules (HO), what is the proper proportion on terms of the atom present in the molecule?
a 2 Hydrogen and 1 Oxygen c. 1 Hydrogen and 2 Oxygen b. 2 Hydrogen and 2 Oxygen d. 1 Hydrogen and 1 Oxygen
15 Which of the following is th chemical formula of lable salt? a H O b. NaCi с. С Н О d CO
16. What are the elements present in CO? a. Sodium & Chlorine c Hydrogen & Oxygen b. Carbon & Oxygen d. Sodium & Oxygen
17 Which of the following description below is NOT a property of nonmetals? a Brittle b Nonductile c Lustrous d Powdery
18 Which nonmetal is used as a water treatment in pools?
a Argon b. Nitrogen c Chlorine d Oxygen
19. At what part can we find the nonmetals in the Periodic Table of Elements? a. Bottom b. Middle c. left d. Right
20 Which of the following choices is the most important use of nonmetal Oxygen?
а. It is important in the process of photosynthesis
b. It is important in cell respiration
c. Used in transmitting chemical signals in the nervous system
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