1.
1 atmostphere (or 760 torr) is equal to the atmospheric pressure....
Correct Answer
A. At sea level
2.
The freezing point (temperature) of a substance is the same as its melting point (temperature)
Correct Answer
A. True
3.
The study of compounds produced by living organisms
Correct Answer
A. Biochemistry
4.
Tearing of paper and melting of butter are examples of....
Correct Answer
B. Physical change
5.
The temperature at which a substance changes from the liquid state to the gaseous state describes...
Correct Answer
C. A physical property
6.
Which of the following are examples of chemical changes?1. Rusting of iron2. Combustion3. Decompostion4.Hydrolysis
Correct Answer
C. 1,2,3 & 4
7.
A fmiliar manifestation of energy is heat.
Correct Answer
A. True
8.
The bonds formed by the sharing of electrons between two atoms.
Correct Answer
C. Covalent
9.
Isotopes of the same element differ in their number of...
Correct Answer
A. Nuetrons
10.
Which of the following is an abbreviation for chemical change?
Correct Answer
B. Equation
11.
The temperature at a given pressure at which a substance changes from the solid state to the liquid state describes...
Correct Answer
C. A physical property
12.
Which is true regarding the Kinetic Theory of Gas?
Correct Answer
C. When gas molecules collide, no loss of energy occurs.
13.
CH2O1. a compound2. a pure substabce3. a mixture4. an element5. matter
Correct Answer
C. 1,2, & 5
14.
100 ml. of a gas at 300 degrees absolute would occupy 50 ml at 150 degrees absolute. This example illustrates____________.
Correct Answer
C. Charles Law
15.
The setting of plaster of Paris is____________.
Correct Answer
C. Exothermic change
16.
What is true regarding the Kinetic Theory of Gas?
Correct Answer
B. Gas molecules are very small in comparison to the average distance between them
17.
Select the correct definition of "calorie"
Correct Answer
A. The quantity of hear necessary to raise the temperature of one gram of water one degree Celsius at fifteen degrees Celsius.
18.
Oil and water mixed together make....
Correct Answer
C. A heterogeneous mixture
19.
It is consistent to sya that one milliter equals one cubic centimeter
Correct Answer
A. True
20.
The decomposition of liquid water into hydrogen gas and oxygen gas when an electric current passes through it.
Correct Answer
C. Chemical change
21.
Color, odor, and tast are examples of....
Correct Answer
B. Physical properties
22.
Which temperature scale is used in gas law calculations?
Correct Answer
A. Kelvin (absolute zero)
23.
In rationalizing the structure of a molecule, atoms try to become "happy" by attaining the electronic configuration of a ________
Correct Answer
B. Noble gas
24.
Deuterium is an isotope of.........
Correct Answer
B. Hydrogen
25.
A positive ion.
Correct Answer
A. Cation
26.
What is Co?
Correct Answer
C. Cobalt
27.
Which is true regarding formulas?1.The metallic portion is usuallly written first and the non-metallic portion is usually written last.2. Metallic elements have positive oxidation numbers.3. A sumbol represents one atom of an element.4. The subscript represents the oxidation number
Correct Answer
C. 1, 2, &3
28.
A group of atoms that behave as if it were a single atom. The groups has its own charge and is called....
Correct Answer
B. Polyatomic ion
29.
All atoms with the exception of hydrogen contain nuetrons
Correct Answer
A. True
30.
Which of the following is characterized as one atomic mass unit?
Correct Answer
B. 1?12 the mass of the carbon atom
31.
CaS + H2O ---> CaO +H2S
Correct Answer
C. Rearrangement
32.
In a pure compound, the proportion by weight of the elements present is always the same. This statement describes.....
Correct Answer
B. The Law of Definite Proportion
33.
If an atom lose an electron, it becomes an ______ with a _________charge.
Correct Answer
C. Ion; positive
34.
They typre of bond that results from the transfer of electrons from one atom to another.
Correct Answer
C. Ionic
35.
2NaCl may be considered......1. two molecules2. one molecule3. one type of compound4. an element
Correct Answer
C. 1 & 3
36.
The atomic number is defined as ......
Correct Answer
A. The number of protons in the nucleus
37.
Two oxygen atoms combine to form molecular oxygen (O2). Which of the following bonds is responsible to holding the two atoms together?
Correct Answer
C. Covalent
38.
Any elements with the atomic number 58 through 71 and 90 through 103.
Correct Answer
B. Rare earth elements
39.
Gases such as oxygen, carbon dioxide, ammonia, and chlorine can not be removed by distillation.
Correct Answer
A. True
40.
CaCl2 + Na2CO3 ---> CaCO3 + 2NaCl. This reation illustrates...
Correct Answer
C. Removal of water hardness by adding washing soda
41.
The attractive forces between the hydrogen on water molecule and an oxygen on another water molecule
Correct Answer
C. Hydrogen bond
42.
Which of the following is true regarding colloid?1. The particles can pass through filters and membrane openings.22. The particles show Brownian motion.3. The particles do settle out of solution.4. The particles are invisible.
Correct Answer
A. 2 only
43.
A red blood cell placed in a hypertonic solution will undergo...
Correct Answer
A. Crenation (shrinking)
44.
Assume we are comparing the concentarion of 2 solutions. The 1 st contains 37 grams of formaldehyde in 100 cc of water. The 2nd solution contains 35 grams of formaldehyde in 100 cc of water. (The solubility of formaldehyde in 100 cc of water is 37 grams. ) in comparison, the solution containing 37 grams of formaldehyde in 100 cc of water is...
Correct Answer
C. Concentrated and saturated
45.
Activated charcoal (very finely ground preparationf of carbon) is used in________.
Correct Answer
B. Adsorption
46.
"a force that causes a surface of liquid to contract"...
Correct Answer
B. Surface tension
47.
CaO + HOH ----> Ca(OH) 2This reaction illustrates which of the following?
Correct Answer
C. Water reacts with some metallic oxides to form bases
48.
Which of the following is true regarding the chemical properties of water?1. Water reacts with non-metals to liberate hydrogen2. Water is a very stable substance3. Water reacts with some metallic oxdes to form acids4. Water forms hydrates5. Water reacts with some non-mettalic oxeds to form salts
Correct Answer
C. 2 & 4
49.
A tincture contains____ as a solvent
Correct Answer
B. Alchohol
50.
If a red blood cell is placed in a 5 percent salt water solution, we would say the solution of the red blood cell is _____ when compared to that of the salt water solution. ( a red blood cell is isotonic physiologic saline at 0.9 percent NaCl.)
Correct Answer
C. Hypotonic