31 Jan D. a second shell
Question 1
1. Which of the following is a method of purifying water?
A. Fixation
B. Freezing
C. Aeration
D. Combustion
Question 2
2. A chemical reaction in which two elements or radicals change places with two other elements or radicals is a _______ reaction.
A. substitution
B. combination
C. decomposition
D. double replacement
Question 3
3. Based upon the pH scale, a vegetable with a pH of 5.3 would be
A. basic.
B. acidic.
C. neutral.
D. ionic.
Question 4
4. Which of the following is true in regard to ions?
A. A cation will hold a positive charge if it gains one or more electrons.
B. Losing one or more electrons will turn an atom into an anion.
C. An ionized atom has a number of protons that is unequal to the number of electrons.
D. Ions can only carry positive charges.
Question 5
5. Which of the following medicinals are utilized to help reduce pain?
A. Sulfonamides
B. Analgesics
C. Tranquilizers
D. Insulin injectables
Question 6
6. Examine the following unbalanced chemical equation: CO2 + C ? CO. Which of the following is the correctly balanced form of this equation?
A. CO2 + C2 ? CO
B. CO2 + C ? 2CO
C. 2CO2 + C ? CO
D. CO2 + C ? C2O
Question 7
7. The valence of aluminum is +3, and the valence of chlorine is –1. The formula for aluminum chloride is correctly written as
A. AlCl3.
B. Al3Cl.
C. ClAl3.
D. Cl3Al.
Question 8
8. The smallest unit of an element that has all of the properties of the element is a/an
A. molecule.
B. neutron.
C. cell.
D. atom.
Question 9
9. All of the following are assumptions presented by Dalton’s atomic theory except that
A. all matter consists of atoms.
B. all atoms of different elements are alike in size, shape, and weight.
C. atoms don’t break into pieces even during chemical reactions.
D. atoms combine with other atoms.
Question 10
10. _______ are atoms that carry an electric charge.
A. Nonelectrolytes
B. Ions
C. Electrolytes
D. Colloids
Question 11
11. Which of the following notations would be the appropriate and final way to display the formula for magnesium chloride?
A. MgCl2
B. MgCl
C. MGCl2
D. Mg+2Cl–1
Question 12
12. The most active of all the chemical elements is a halogen known as
A. bromine.
B. astatine.
C. iodine.
D. fluorine.
Question 13
13. Which one of the following groups of chemical compounds is composed entirely of organic compounds?
A. C2H2, CH4, CaCl2, CaCN2
B. Ch3OCH3, Ca3(PO4)2, CO2, H2CO3
C. C2H4O, CH2O, CaSO4, C3H5(OH)3
D. C6H6, C2H5OH, C6H5CH3, C3H5(NO3)3
Question 14
14. Organic chemistry is the study of compounds containing
A. nitrogen.
B. oxygen.
C. carbon.
D. hydrogen.
Question 15
15. The purpose of an indicator is to
A. make a solution more neutral.
B. help acids and bases dissociate when placed in water.
C. conduct electricity.
D. test and determine the pH values of unknown solutions.
Question 16
16. Which of the following accurately describes acids and bases in regard to ionization?
A. When free hydrogen ions and free hydroxyl ions are removed from solutions of acids and bases, the acidic and basic properties disappear.
B. Weak bases dissociate only to a slight degree to produce free hydrogen ions.
C. When an acid and a base are mixed together in the proper proportions, two hydroxyl ions will unite.
D. Weak acids dissociate to a great degree.
Question 17
17. If you place a crystal substance on a tabletop, return to view it after some time passes, and find it as a powdered substance, which of the following processes most likely took effect?
A. Deliquescence
B. Distillation
C. Crystallization
D. Efflorescence
Question 18
18. An atom of chlorine has several valence electrons in its
A. third shell.
B. second shell.
C. nucleus.
D. first shell.
Question 19
19. The atomic number of oxygen is 8, because oxygen has
A. an atomic mass of 8.
B. electrons in eight shells.
C. eight protons in the nucleus.
D. a second shell with eight electrons.
Question 20
20. If you find that a substance turns litmus paper to blue and contains hydroxide ions, it is most likely
A. a salt.
B. water.
C. a base.
D. an acid.
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