Chemical Reaction 1
Metals like potassium and lead lose electrons to become a __________________;
a. neutral atom
b. positive ion
c. negative ion
d. covalent ion
positive ion
Which of the following explains the role of valence electrons?
a. They are the least common type of electrons and give their ion a positive charge.
b. They are the electrons in an atom that can be used to form bonds.
c. They are the electrons that have escaped the nucleus of the atom.
d. They are free electrons that are not part of an atom.
B. They are the electrons in an atom that can be used to form bonds.
Which of the following does NOT describe an interaction that a metal can have?
A. Forming a positive ion
B. Associating with a non-metal
C. Forming a covalent bond
D. Associating with other metal ions
C. Forming a covalent bond
If two barium sulfate molecules (2BaSO4) were used as a reactant in a reaction, how many oxygen atoms would they contribute?
A. 1
B. 4
C. 8
D. 12
c. 8
A reaction that forms bonds and releases energy can be described as which of the following. Choose all that apply.
A. endothermic
B. exothermic
C. decomposing
D. synthesis
B. exothermic
D. synthesis
Nonmetals like oxygen and chlorine gain electrons to become a _____________;
a. neutral atom
b. positive ion
c. negative ion
d. ionic bond
negative ion
Methane has the formula, CH4. In this molecule, hydrogen (H) has an oxidation number of +1. Methane is overall neutral, so what is the oxidation number of carbon (C)?
a. +4
b. 0
c. -1
d. -4
d. -4
Dinitrogen trioxide contains ___ nitrogen atom(s) and ___ oxygen atom(s).
2, 3
The following reaction is NOT balanced. Only ___ requires a coefficient of ___.
A CuCl2, 1
B CuS, 2
C HCl, 2
D CuCl2, 4
C HCl, 2
Natural resources can be used to
A. produce only more complex natural resources
B. produce only synthetic substances
C. produce both natural and synthetic substances
D. produce only other natural resources
C. produce both natural and synthetic substances
A negatively charges Iodine (I) ion would most likely be attracted to which of the following?
a. A positively charged Lithium (Li) ion.
b. A neutral Helium (He) atom.
c. A negatively charged Oxygen (O) ion.
d. Another negatively charged Iodine (I) ion
A positively charged Lithium (Li) ion.
Which of the following statements describes the noble gases? Choose all that apply.
a. They have a full outer shell with 8 valence electrons.
b. They form positive ions.
c. They react only with metals.
d. They are non-reactive.
a. They have a full outer shell with 8 valence electrons.
d. They are non-reactive.
Which group on the periodic table has elements with the highest number of valence electrons?
A. H, Li, Na, K
B. Be, Mg, Ca, Sr
C. O, S, Se, Te
D. F, Cl, Br, I
D. F, Cl, Br, I
The following reaction shows chlorine reacting with sodium bromide. This equation can be described as a _____ and _____.
Cl2 + 2NaBr ---------> 2NaCl + Br2
a. synthesis reaction, balanced
b. single replacement, synthetic
c. double replacement, balanced
d. single replacement, balanced
single replacement, balanced
Which of the following describes an impact of synthetic materials on society?
A. They mimic natural materials
B. They could cause an increase in pollution
C. They work differently than natural materials
D. They have a different structure than natural materials
B. They could cause an increase in pollution
An association between a metal that has given up an electron to a non-metal that has accepted that electron is called
Ionic bonding
H2S is a ___________, and its name is _________.
a. binary compound, hydrogen sulfur
b. polyatomic ion, hydrogen sulfide
c. ionic compound, hydrogen sulfate
d. binary compound, hydrogen sulfide
d. binary compound, hydrogen sulfide
Which of the following identifies the products in the reaction shown?
CH4 + 2O2 ----------> CO2 + 2H2O
A. CH4 and O2 only
B. CO2 and H2O only
C. O2 and H2O only
D. CH4, O2, CO2, and H2O
B. CO2 and H2O only
Chemical reactions that are not balanced
a. have elements that are highly reactive.
b. always have oxygen in them.
c. break the Law of Conservation of Mass.
d. used less energy that balanced reactions.
c. break the Law of Conservation of Mass.
Lewis dot structure show:
A. All the electrons within an atom.
B. The nucleus and electrons of an atom
C. Only the valence electrons of an atom
D. The number of protons, neutrons, and electrons in an atom
C. Only the valence electrons of an atom
When two non-metals share electrons between them is called
Covalent bonding
The name of polyatomic ions have been provided to help you in naming the following compound: Mg(ClO3). The first name of this compound is _____ and the second name of this compound is ______.
A. manganese, chlorite
B. magnesium, chlorate
C. permanganate, hypochlorite
D. manganese, chlorate
b. magnesium, chlorate
The breakdown of silver chloride absorbs a great deal of energy from sunlight as it progresses; it can be described as both ______ and _____.
2AgCl -----------> 2Ag + Cl2
a. exothermic, synthesis
b. endothermic, decomposition
c. hypothermic, replacement
d. exothermic, decomposition
b. endothermic, decomposition
All of the molecules in the following reaction contain nonmetals, CH4 + 2O2 ----> CO2 + 2H2O
These molecules can best be described as
a. ionic
b. endothermic
c. exothermic
d. covalent
d. covalent
A line between two elements in a Lewis Dot Structure means that the molecule contains:
A. a covalent bond
B. an ionic bond
C. a metallic bond
D. an exponential bond
A. a covalent bond