Name_______________________________ Period_____ Date____________
Practice Chemistry Test Answer Key
Part 1: Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
____ 1. Elements are made up of _______.
a. atoms
b. compounds
c. molecules
d. mixtures
____ 2. The center of an atom is known as the ________.
a. electron cloud
c. orbital
b. nucleus
d. neutron
____ 3. The number of protons and neutrons in the nucleus of an atom is the _______.
a. atomic number
c. mass number
b. electron count
d. nucleus number
____4. Atom is to element as molecule is to ________.
a. solution
c. compound
b. mixture
d. atom
____ 5. The number of electrons in the outermost energy level of an atom is ______.
a. isotopes
c. quarks
b. neutrons
d. valance electrons
____ 6. Atoms of the same element with different numbers of neutrons are called______.
a. radioactive elements
c. isotopes
b. metalloids
d. metals
____ 7. The horizontal rows on the periodic table are known as _______.
a. groups
c. families
b. periods
d. metals
____ 8. Al, C, Cu, and N are symbols for
a. molecules
b. elements
c. compounds
d. mixtures
____ 9. How many hydrogen atoms are present in one molecule of ammonium acetate,
NH4C2H3O2?
a. 12
b. 11
c. 7
d. 4
____ 10. A certain atom has 26 protons, 26 electrons, and 30 neutrons. Its mass number is ____.
a. 56
c. 30
b. 26
d. 52
____ 11. A metal is said to be __________ because it can be hammered into thin sheets.
a. malleable
c. ductile
b. a good conductor
d. shiny
____ 12. Metals have all of the following properties EXCEPT:
a. ductile
c. malleable
b. luster
d. poor conductors
____ 13. When two or more elements combine, they form a(n) ________.
a. atom
c. molecule
b. mixture
d. solution
____ 14. If CaCO3 (calcium carbonate) is a molecule, than 5CaCO3 is a
a. solution
c. heterogeneous mixture
b. element
d. compound
____ 15. Which of the following is an example of heterogeneous matter?
a. milk
c. salt
b. salad
d. flour
____ 16. ________ is another name for a homogeneous mixture.
a. Atom
c. Suspension
b. Substance
d. Solution
____ 17. The part of a solution that gets dissolved is known as the _______.
a. solvent
c. substance
b. solute
d. colloid
____ 18. When a certain material is capable of dissolving in another substance it is said to be __.
a. conductive
c. malleable
b. insoluble
d. soluble
____ 19. What phase of matter has a definite shape and definite volume?
a. gas
c. liquid
b. solid
d. plasma
____ 20. Matter in which the molecules are tightly packed together and moving slowly is ____.
a. gas
c. liquid
b. solid
d. plasma
____ 21. Matter that takes on the shape of its container and has a definite volume is _____
a. gas
c. liquid
b. solid
d. plasma
____ 22. The process of a liquid changing to a gas is known as ______.
a. melting
c. vaporization
b. freezing
d. condensation
____ 23. The temperature at which a solid changes to a liquid is called the ______.
a. melting point
c. freezing point
b. boiling point
d. condensation point
____ 24. The process of a gas changing to a liquid is known as __________.
a. melting
c. boiling
b. freezing
d. condensation
____ 25. Three examples of physical changes are ________.
a. sawing of wood, crushing a can, and toasting a marshmallow
b. boiling water, bursting of a balloon, and crumpling a piece of paper
c. burning of gasoline, rotting of an egg, and exploding fireworks
d. freezing of water, evaporation of gasoline, and rusting a nail
____ 26. A change that produces one or more new substances is a ____________.
a. chemical change
c. phase change
b. physical change
d. color change
____ 27. Each substance on the left side of the arrow in a chemical equation is a ______.
a. product
c. catalyst
b. reactant
d. coefficient
____ 28. The rate of a chemical reaction increases when the temperature _____.
a. decreases
c. increases
b. stays the same
d. cools
____ 29. According to the law of conservation of matter, if 2 atoms of hydrogen are used as a
reactant, how many atoms of hydrogen must be part of the product?
a. 4
b. 2
c. 1
d. 0
____ 30. As the size of the reacting particles decreases, the rate of the chemical reaction _______.
a. increases
c. decreases
b. stays the same
d. slows down
Part 2:True/False
Indicate whether the statement is true or false. If false, change the underlined word to
make the statement true.
__F__ 31. When a metal combines with another metal, they form an ionic bond.
__T__ 32. The number of protons in an atom is equal to the number of electrons.
__F__ 33. The freezing of water is known as a chemical change.
__F__ 34. When the ions Ca2+ and Cl1- combine, the chemical formula is Ca2Cl.
__F__ 35. A particle that orbits the nucleus is the proton.
__F__ 36. When an atom loses electrons, it becomes a negatively charged ion.
__T__ 37. Elements that are unreactive belong to the Noble Gas family.
__F__ 38. Elements in the same period share the same amount of valence electrons.
__T__ 39. Elements that have properties of both metals and nonmetals are metalloids.
Part 3: Short Answer
Answer the following questions in complete sentences.
40. Explain the difference between ionic and covalent bonds.
Ionic- Electrons are transferred from a metal to a non-metal
Covalent- Electrons are shared between two non-metals
________________________________________________________________________
41. Using the period table, answer the following questions (41a-g)
based on the element chlorine.
a.
b.
c.
d.
e.
f.
g.
What is the name of the family it belongs to? Halogen
What is its atomic number? 17
What phase is it in at room temperature? gas
How many energy levels does it have? 3
How many valence electrons does it have? 7
What type of ion will it form with a metal? ionic
What is its oxidation number? -1
42. This is the weakest force: gravity (1 point)
43. An example of a diatomic molecule is H2 O2 F2 Br2 I2 N2 Cl2 (1 point)
44. When an atom loses electrons it: It loses its negative charge and becomes positive
(1 point)
Drawing an Atom
Use the following information to draw an atom of two different elements. Make sure to
include the correct number of protons, neutrons and electrons where they belong in each
atom.
Element
45. Sodium
46. Potassium
Atomic Number
11
19
Mass Number
23
39
A) Balance the equations and B) name the reaction type
47a. ____ AlBr3 + ____3 K  ____3 KBr + ____ Al
47b. Name: Single Replacement
49b. Name: Synthesis
48a) ___1 AgNO3 + ___1 Li  ____1 LiNO3 + ___1 Ag
48b. Name: Single Replacement
49a) ____2 P4 + ____12 Br2  ____8 PBr3
50a.) ____2 LiCl + ____ Br2  ____2 LiBr + ____ Cl2
50b. Name: Single Replacement
Challenge: Name 3 ways that can increase chemical reaction rates:
Increase temperature, use catalysts, decrease size of substance (if solids)