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Chemistry Practice Test
True/False
Indicate whether the statement is true or false. If false rewrite the statement to make it true.
____
1. Personal opinion is not a step in the scientific method.
____
2. The dependent variable is the variable you are going to change in the experiment.
____
3. Theories are definite facts.
____
4. Precision is to be able to take the same measurement and get the same result over and over again.
____
5. A calorie is a type of physical object.
____
6. 1cm = 100mm
____
7. An element is a pure substance that can be broken down by normal chemical or physical means.
____
8. The two allotropes of oxygen are water and ozone.
____
9. A ternary compound is made up of three (3) elements.
____ 10. A solution is a heterogeneous mixture in liquid or gas form.
____ 11. Colloids, sols, gels, foams, aerosols, and emulsions are examples of homogeneous solutions.
____ 12. Toxicity is a chemical property.
____ 13. The surface tension of water can hold up a more dense solid object, such as a needle.
____ 14. Liquids, gases, and plasmas are fluids.
____ 15. A phase change is a result of physical changes in volume.
____ 16. Both protons and neutrons are located in the nucleus of an atom.
____ 17. A molecules consists of atoms held together by physical bonds.
____ 18. Cations are positively-charged ions.
____ 19. Isotopes are atoms of the same element with the same number of neutrons.
____ 20. The only common isotopes of hydrogen are deuterium and tritium.
____ 21. The relative atomic mass is the weighted average of mass of all of an element’s isotopes.
____ 22. The Periodic Table used now is organized by increasing atomic weight.
____ 23. There are eighteen (18) groups that are vertical columns on the Periodic Table.
____ 24. Members of the same period (row) on the Periodic Table have similar properties.
____ 25. Alkali metals have high melting points.
____ 26. Iron, zinc, silver, and gold are examples of transition metals.
____ 27. Halogens are not highly reactive.
____ 28. The Lanthanide and Actinide series elements are called the inner transition metals.
____ 29. Electrons travel around the nucleus in simple orbits.
____ 30. The four (4) types of oribtals are s, p, d, and f.
____ 31. A beaker is a glass container with a thin neck that widens to a flat or rounded base.
____ 32. An Erlenmeyer flask is often used to hold liquids during a filtration or titration process.
____ 33. Liquid measurements are taken from the top of the curve of a meniscus in a graduated cylinder at eye level.
____ 34. Displacement occurs when one (1) substance takes the place of another.
____ 35. Liquids in a burette should contain bubbles.
____ 36. Triple beam and single-pan electronic balances are used to measure weight.
____ 37. Thermistors are used to measure temperature.
____ 38. A torr is a unit of pressure.
____ 39. A volumetric pipette is a long, skinny tube with a bulb at one (1) end.
____ 40. The four (4) sections of the chemical safety information diamond are flammability, health, reactivity, and
special warning.
____ 41. An MSDS is prepared by the user of the chemical.
____ 42. Warning symbols for chemicals have a black triangle on a red background.
____ 43. The corrosive symbol on a chemical warning label indicates the presence of strong acids or bases.
____ 44. The eye protection symbol means that safety goggles are optional.
____ 45. A lab coat is worn to keep chemicals off your regular clothes.
____ 46. It is acceptable to be alone when working in the lab.
____ 47. Eating or drinking in the laboratory is not OK.
____ 48. Acids and bases can be stored next to each other.
____ 49. When an acid must be mixed with water, add the acid slowly to the water.
____ 50. All chemicals can be disposed down the drain.
You Be The Chemist Practice Test
Answer Section
TRUE/FALSE
1. ANS: T
An opinion is not based on evidence from observations. Observation is a key step in the scientific method.
PAGE 6
PTS: 1
2. ANS: F
The independent variable is the variable you are going to change in the experiment. The dependent variable is
the one you are going to observe in the experiment.. PAGE 9
PTS: 1
3. ANS: F
Theories are not facts because they may change as more information becomes available. A theory is an
explanation of some event or thing that is well supported by facts. PAGE 11
PTS: 1
4. ANS: T
Precision is to be able to take the same measurement and get the same result over and over. Accuracy is to get
as close as possible to the true measurement (true value) of something. PAGE 12
PTS: 1
5. ANS: F
A calorie is not a physical object. A calorie is a physical measurement unit used to measure energy. PAGE 18
PTS: 1
6. ANS: F
1cm = 10mm
10cm = 100mm
PAGE 22
PTS: 1
7. ANS: F
An element is a pure substance that cannot be broken down by normal chemical or physical means. However
a mixture can be separated into its original parts. PAGE 26
PTS: 1
8. ANS: F
The two gaseous allotropes of oxygen are diatomic oxygen and ozone. Water is a compound of oxygen and
hydrogen joined in a defined ratio. PAGE 27
PTS: 1
9. ANS: T
PAGE 28
PTS: 1
10. ANS: F
A homogeneous mixture in liquid or gas form is usually called a solution. A heterogeneous mixture is a type
of mixture in which the makeup is not the same throughout. PAGE 29
PTS: 1
11. ANS: F
Colloids, sols, gels, foams, aerosols, and emulsions are not classified simply as homogenous or
heterogeneous. A collide mixture is between homogenous and heterogeneous because of fine particles of one
substance mixed into another. PAGE 30
PTS: 1
12. ANS: T
PAGE 33
PTS: 1
13. ANS: T
PAGE 35
PTS: 1
14. ANS: T
PAGE 35
PTS: 1
15. ANS: F
Phase changes occurs because a substance has been given energy or energy has been taken away. Two ways
to give a substance energy are through temperature and pressure. PAGE 42
PTS: 1
16. ANS: T
PAGE 48
PTS: 1
17. ANS: F
A molecule consists of atoms held together by chemical bonds. A molecule is the smallest particle of an
element or compound that keeps the chemical properties of that element or compound. PAGE 50
PTS: 1
18. ANS: T
PAGE 51
PTS: 1
19. ANS: F
Isotopes are atoms of the same element with different number of neutrons. Atoms of the same element can
have different numbers of neutrons, but the number of protons is the same for all atoms of it. PAGE 52
PTS: 1
20. ANS: F
The three (3) common isotopes of hydrogen are protium, deuterium, and tritium. The most common isotope
of hydrogen has no neutrons and is called protium. PAGE 52
PTS: 1
21. ANS: T
PAGE 54
PTS: 1
22. ANS: F
The periodic table is organized by increasing atomic number but was originally organized by increasing
atomic weight. Experiments showed that two atoms having slightly different atomic weights but the same
atomic number behaved alike. PAGE 56
PTS: 1
23. ANS: T
PAGE 57
PTS: 1
24. ANS: F
Members of the same period (row) on the Periodic Table do not have similar properties. However members of
the same group (column) usually have very similar properties. PAGE 57
PTS: 1
25. ANS: F
Alkali metals have low melting points and oxidize easily. Transition metals have very high melting points.
PAGE 58
PTS: 1
26. ANS: T
PAGE 62
PTS: 1
27. ANS: F
Halogens are highly reactive and are not found naturally in pure form on Earth. PAGE 66
PTS: 1
28. ANS: T
PAGE 70
PTS: 1
29. ANS: F
Electrons move around the nucleus in cloud-like zones. PAGE 71
PTS: 1
30. ANS: T
PAGE 73
PTS: 1
31. ANS: F
A beaker is a wide container with a flat bottom made of glass or plastic. A flask is a glass container with a
thin neck that widens to a flat or rounded base. PAGE 75
PTS: 1
32. ANS: T
PAGE 75
PTS: 1
33. ANS: F
These measurements are taken from the bottom of the curve. The meniscus is the concave (inward) curve at
the liquid’s surface and may not occur in some plastic graduated cylinders. PAGE 77
PTS: 1
34. ANS: T
PAGE 77
PTS: 1
35. ANS: F
A burette is a long glass cylinder used to measure and dispense a specific volume of liquid very accurately.
Liquids in a burette should not contain any measurements because they affect measurements. PAGE 78
PTS: 1
36. ANS: F
Triple beam and single-pan electronic balances are used to measure the mass of an object. Balances compare
the unknown mass of an object to the known mass of another to eliminate the effect of gravity. PAGE 78
PTS: 1
37. ANS: T
PAGE 79
PTS: 1
38. ANS: T
PAGE 81
PTS: 1
39. ANS: F
A Pasteur pipette is a long, skinny tube with a bulb at one (1) end. A volumetric pipette is a long, skinny tube
with an enlargement in the middle and a suction device at one (1) end. PAGE 82
PTS: 1
40. ANS: T
PAGE 84
PTS: 1
41. ANS: F
A Material Safety Data Sheed (MSDS) is prepared by the manufacturer of a product. An MSDS gives
workers and emergency personnel information about the proper way to handle or work with a certain
substance. PAGE 85
PTS: 1
42. ANS: F
Warning symbols for chemicals have a black triangle on a yellow background. Inside the black triangle is a
symbol, also in black, indicating a specific warning, such as flammable or poisonous. PAGE 86
PTS: 1
43. ANS: T
PAGE 86
PTS: 1
44. ANS: F
The eye protection symbol means that safety goggles or other eye protection is required. Industrial safety
glasses protect eyes from sharp, flying objects but do not seal completely around the eyes as safety goggles
do. PAGE 88
PTS: 1
45. ANS: T
PAGE 89
PTS: 1
46. ANS: F
Never work alone in the lab. Always have an adult to help you with your experiment in case there is an
emergency. PAGE 89
PTS: 1
47. ANS: T
PAGE 90
PTS: 1
48. ANS: F
Acids and bases should be stored in separate areas to prevent them from accidently mixing. Reactive
chemicals should not be stored alphabetically because they may end up next to each other in the storage area.
PAGE 90
PTS: 1
49. ANS: T
PAGE 91
PTS: 1
50. ANS: F
Do not casually dispose of any chemicals down the drain. Ask your teacher which chemicals can be washed
down the drain and which require a different method of disposal. PAGE 92
PTS: 1