th
8
nd
2
grade
quarter
study guide
1. This happens when chemical
bonds break and new bonds
form?
A. a physical change
B. a chemical reaction
C. matter is destroyed
D. surface area increases
2. The atomic number of an
element is based on the
A.mass of its nucleus.
B.number of electrons around
its core.
C.number of protons in its
nucleus.
D.number of neutrons in its
nucleus.
3. Which process is an example
of a physical change?
•
A. paper burning
•
B iron rusting
•
C dissolving salt in water
•
D milk souring
4. Which group of elements
shares characteristics with
both metals and nonmetals?
A.salts
B.metalloids
C.halogens
D.alloys
5. A solid that forms from solution
during a chemical reaction is
called a(n)
A. element.
B. bond.
C. mixture.
D. precipitate.
6. A chemical reaction that
absorbs energy in the form of
heat is described as
A. endothermic.
B. exothermic.
C. combustion.
D. unbalanced.
7. The simplest type of substance
that cannot be broken down into
any other substance is a(n)
A. precipitate.
B. compound.
C. mixture.
D. element.
8. When an atom loses an
electron, it becomes a
A. positive ion.
B. negative ion.
C. neutral ion.
D. neutral atom.
9. A chemical bond formed when
two atoms share electrons is
called a(n)
A. ionic bond.
B. covalent bond.
C. polyatomic bond.
D. crystal bond
10. According to the Law of Conservation of
Mass, when Hydrogen and oxygen combine
chemically, the mass of the product is
A.greater than the mass of the hydrogen
plus the mass of the oxygen
B. equal to the mass of the hydrogen plus
the mass of the oxygen
C. equal to the mass of the hydrogen
D. less than the mass of the hydrogen
11. The substances listed on the
left side of a chemical equation
are the
A. products.
B. coefficients.
C. precipitates.
D. reactants.
12. Which particles in an atom
are in the nucleus?
A. protons and neutrons
B. protons and electrons
C. protons and ions
D. electrons and neutrons
13. Electrons involved in bonding
between atoms are
A. valence electrons.
B. inside the nucleus.
C. closest to the nucleus.
D. positively charged.
14 What is the chemical name for
the compound with the formula
Li2S?
A. Lithium Sulfur
B. Sulfur Lithide
C. lithium sulfide
D. sodium sulfide
15. The atomic number is the
number of
A. protons in the nucleus of an
atom.
B. neutrons in the nucleus of an
atom.
C. valence electrons in an atom.
D. electrons in the nucleus of an
16. Which of these particles has a
positive charge?
A. atom
B. proton
C. neutron
D. electron
17. An ionic bond is the attraction
between
A. similarly charged ions.
B. oppositely charged ions.
C. neutral ions.
D. neutral atoms.
18.Fill in the chart
Substance
Atomic
Number
Atomic Mass
Beryllium
Potassium
19
Calcium
20
Phosphorus
Protons
Neutrons
4
5
39
19
20
31
Electrons
15
20
20
15
Use this periodic table to answer the
following questions.
19. Which elements have one
valence electrons in their
atoms?
A. transition metals
B. metal alloys
C. alkaline earth metals
D. alkali metals
20. In an electron dot diagram of
Boron(B), how many dots should
be drawn around the element’s
symbol?
A. 1
B. 13
C. 5
D. 3
21.How many atoms of a
Oxygen(O) would be needed to
react with one atom of a
Magnesium (Mg) element, in
order to form an ionic
compound?
A. 1
B. 3
C. 2
22. Fluorine(F), chlorine(Cl),
bromine(Br), and iodine(I) are
part of a family called
A. noble gases.
B. metalloids.
C. halogens.
D. alkali metals.
Balance the equations
• Cl2 + NaBr
• H2 + N2
• Na + Br2
NaCl + Br2
NH3
NaBr
1. This happens when chemical
bonds break and new bonds
form?
A. a physical change
B. a chemical reaction
C. matter is destroyed
D. surface area increases
2. The atomic number of an
element is based on the
A.mass of its nucleus.
B.number of electrons around
its core.
C.number of protons in its
nucleus.
D.number of neutrons in its
nucleus.
3. Which process is an example
of a physical change?
•
A. paper burning
•
B iron rusting
•
C dissolving salt in water
•
D milk souring
4. Which group of elements
shares characteristics with
both metals and nonmetals?
A.salts
B.metalloids
C.halogens
D.alloys
5. A solid that forms from solution
during a chemical reaction is
called a(n)
A. element.
B. bond.
C. mixture.
D. precipitate.
6. A chemical reaction that
absorbs energy in the form of
heat is described as
A. endothermic.
B. exothermic.
C. combustion.
D. unbalanced.
7. The simplest type of substance
that cannot be broken down into
any other substance is a(n)
A. precipitate.
B. compound.
C. mixture.
D. element.
8. When an atom loses an
electron, it becomes a
A. positive ion.
B. negative ion.
C. neutral ion.
D. neutral atom.
9. A chemical bond formed when
two atoms share electrons is
called a(n)
A. ionic bond.
B. covalent bond.
C. polyatomic bond.
D. crystal bond
10.
According to the Law of Conservation of Mass,
when Hydrogen and oxygen combine chemically,
the mass of the product is
A.greater than the mass of the hydrogen plus the
mass of the oxygen
B. equal to the mass of the hydrogen plus the mass
of the oxygen
C. equal to the mass of the hydrogen
D. less than the mass of the hydrogen
11. The substances listed on the
left side of a chemical equation
are the
A. products.
B. coefficients.
C. precipitates.
D. reactants.
12. Which particles in an atom
are in the nucleus?
A. protons and neutrons
B. protons and electrons
C. protons and ions
D. electrons and neutrons
13. Electrons involved in bonding
between atoms are
A. valence electrons.
B. inside the nucleus.
C. closest to the nucleus.
D. positively charged.
14 What is the chemical name for
the compound with the formula
Li2S?
A. Lithium Sulfur
B. Sulfur Lithide
C. lithium sulfide
D. sodium sulfide
15. The atomic number is the
number of
A. protons in the nucleus of an
atom.
B. neutrons in the nucleus of an
atom.
C. valence electrons in an atom.
D. electrons in the nucleus of an
atom.
16. Which of these particles has a
positive charge?
A. atom
B. proton
C. neutron
D. electron
17. An ionic bond is the attraction
between
A. similarly charged ions.
B. oppositely charged ions.
C. neutral ions.
D. neutral atoms.
18.Fill in the chart
Substance
Atomic
Number
Atomic Mass
Protons
Neutrons
Electrons
Beryllium
4
9
4
5
4
Potassium
19
39
19
20
19
Calcium
20
40
20
20
20
Phosphorus
15
31
15
16
15
Use this periodic table to answer the
following questions.
19. Which elements have one
valence electrons in their
atoms?
A. transition metals
B. metal alloys
C. alkaline earth metals
D. alkali metals
20. In an electron dot diagram of
Boron(B), how many dots should
be drawn around the element’s
symbol?
A. 1
B. 13
C. 5
D. 3
21.How many atoms of a Oxygen(O)
would be needed to react with one
atom of a Magnesium (Mg) element,
in order to form an ionic compound?
A. 1
B. 3
C. 2
D. 4
22. Fluorine(F), chlorine(Cl),
bromine(Br), and iodine(I) are
part of a family called
A. noble gases.
B. metalloids.
C. halogens.
D. alkali metals.
Balance the equations
• Cl2 + NaBr
• H2 + N2
• Na + Br2
NaCl + Br2
NH3
NaBr
Balance the equations
• Cl2 + 2NaBr
• 3H2 + N2
• 2Na + Br2
2 NaCl + Br2
2NH3
2NaBr