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WorksheetsFall Final Review
Total questions: 50
Worksheet time: 25mins
What is a system of knowledge and the methods used to find that knowledge?
science
technology
measurement
curiosity
What are the building blocks of all matter?
forces
atoms
magnetic fields
kinetic and potenial energy
in which step of the scientific method is information obtained through the senses?
drawing conclusions
making observations
analyzing data
revising hypothesis
What happens when the data in an investigation do not support the original hypothesis?
The scientist gives up and starts an investigation on a new topic.
The data must be incorrect and are thrown out.
The hypothesis is revised.
The data are altered so that they support the original hypothesis.
What is a statement that summarizes a pattern found in nature?
a scientific law
a fact
a scientific theory
a hypothesis
Which of the following statements is true about scientific theories?
Scientific theories become scientific laws.
Scientific theories are never proven.
Scientific theories become hypotheses.
Scientific theories summarize patterns found in nature.
Why are scientific models important?
They prove scientific theories.
They help visualize things that are very complex, very large, or very small.
They make it harder to understand things.
They never change.
If the relationship between the manipulated variable and the responding variable is a direct proportion, what will a line graph of this relationship look like?
a straight line
a curved line
a jagged line
none of the above
If a material contains three elements joined in a fixed proportion, it is a(an)
mixture
solution
atom
compound
Which of the following is a characteristic of a mixture?
has varying properties
has a fixed composition
contains only pure substances
both a and b
A mixture that appears to contain only one substance is a(n)
Homogeneous mixture
heterogenous mixture
compound
element
A substance has a melting point of 0˚C and a boiling point of 100˚C. The substance is most likely
water
hydrogen
gold
table salt
Filtration can be used to separate mixtures based on
their boiling points
their densities
their melting points
the size of their particles
Which of the following is a physical change?
sawing a piece of wood in half
burning a piece of wood
rust foring on an iron fence
a copper roof changing color from red to green
A substance that has high reactivity
easily combines chemically with other substances.
burns in the presence of water.
displaces dissolved oxygen.
has a high boiling point.
Which of the following is a chemical change?
ice melting
ice being carved
water boiling
water breaking down into hydrogen and oxygen
A gas has...
a definite volume but no definite shape.
a definite shape but no definite volume.
no definite shape or definite volume.
a definite volume and definite shape.
Ninety-nine percent of all the matter that can be observed in the universe exists as
gases
plasmas
liquids
solids
In an atomic model that includes a nucleus, positive charge is
concentrated in the center of an atom.
spread evenly throughout an atom.
concentrated at multiple sites in an atom.
located in the space outside the nucleus.
Which statement about subatomic particles is true?
Protons, neutrons, and electrons all have about the same mass.
Unlike protons or neutrons, electrons have no mass.
Neutrons have no charge and no mass.
An electron has far less mass than either a proton or neutron.
The number of protons in one atom of an element is that element’s
mass number
balanced charge
atomic number
isotope
Identify the segments labeled A and B.
A and B are both periods.
A is a period and B is a group.
A and B are both groups.
A is a group and B is a period.
Which of the following Group 1A elements is the most reactive?
Cs (cesium)
Li (lithium)
K (potassium)
Na (sodium)
Which of the following Group 7A elements is the most reactive?
Cl (chlorine)
I (iodine)
F (fluorine)
Br (bromine)
The atomic mass of an element is
the sum of the protons and neutrons in one atom of the element.
twice the number of protons in one atom of the element.
a ratio based on the mass of a carbon-12 atom.
a weighted average of the masses of an element’s isotopes.
Which list of elements contains only metals?
carbon, iodine, tin
tin, copper, cesium
helium, iron, copper
iodine, carbon, argon
Group 7A of the periodic table contains the
most reactive non metals
most reactive metals
least reactive non metals
least reactive metals
Two highly reactive elements in Period 2 are the metal lithium and the
metalloid arsenic.
nonmetal selenium.
non metal fluorine
nonmetal krypton.
As you move from left to right across a period, the number of valence electrons
increases
stays the same
increase and then decreases
decreases
The tendency of an element to react is closely related to
its atomic mass.
attractions between its atoms.
the number of valence electrons in atoms of the element.
the ratio of protons to neutrons in atoms of the element.
Which of the following groups contain three elements with stable electron configurations?
lithium, krypton, argon
argon, neon, barium
xenon, neon, boron
helium, xenon, neon
Typically, atoms gain or lose electrons to achieve
an exchange of energy.
ionization.
a stable electron configuration. Octet rule.
vaporization.
Study the electron dot diagrams for lithium, carbon, fluorine, and neon in Figure 6-1. Choose the statement that correctly identifies the most stable of the elements.
Lithium is the most stable element because it has to lose only one electron to achieve a stable configuration.
Carbon is the most stable element because it can form four bonds.
Fluorine is the most stable element because it has to gain only one electron to achieve a stable configuration.
Neon is the most stable element because its highest occupied energy level is filled.
The formation of an ionic bond involves the
transfer of electrons
transfer of neutrons
transfer of protons
sharing of electrons
In the compound MgCl2 , the subscript 2 indicates that
there are two magnesium ions for each chloride ion
the chloride ion is twice the size of the magnesium ion
magnesium and chloine form a double covalent bond
there are two chloride ions for each magnesium ion
Alkali metals, alkaline earth metals, and aluminum all form ions with positive charges equal to the
atomic number
group number
period
atomic mass
In the name carbon dioxide, the prefix of the second word indicates that a molecule of carbon dioxide contains
two carbon atoms
two oxygen atoms
a polyatomic ion
an ionic bond
Which phrase best describes a metallic bond?
a bond that is formed by a metal
the attraction between a metal anion and a shared pool of electrons
a bond that forms between a metal and a nonmetal
the attraction between a metal cation and a shared pool of electrons
The substances that undergo change in a chemical reaction are called
reactants
products
coefficient
elements
Hydrochloric acid, HCl, is added to solid NaOH. After the reaction is complete, NaCl dissolved in water remains. What are the products of this chemical reaction?
NaOH and HCl
NaOH and H2O
HCl and NaCl
NaCl and H2O
Which of the following is a chemical equation that accurately represents what happens when sulfur and oxygen react to form sulfur trioxide?
Sulfur and oxygen react to form sulfur trioxide.
S and O2 produce SO3
S+O2→SO3
2S+3O2→2SO3
In a compound, chemical energy is contained in the
nuclei of the atoms.
unbonded electrons.
bonds.
movement of the electrons
Which of the following statements is true about what happens during a chemical reaction?
Bonds of the reactants are broken, and bonds of the products are formed.
Bonds of the reactants are formed, and bonds of the products are broken.
The bonds of both the reactants and the products are broken.
The bonds of both the reactants and the products are formed.
In terms of energy, how would you classify the following chemical reaction? 2Cu + O2 → 2CuO + 315 kJ
endothermic
exothermic
both endothermic and exothermic
neither endothermic or exothermic
For the chemical reaction C2H6 + 137 kJ → C2H4 + H2, the chemical energy of the
reactant is greater than the chemical energy of the products.
products is greater than the chemical energy of the reactant.
In general, if the temperature of a chemical reaction is increased, the reaction rate
increases
decreases
remains the same
cannot be predicted
When balancing a chemical reaction, the ...
total number of atoms on each side much equal.
number of each element must be equal on each side.
What is the missing coefficient in the chemical equation;
C3H8 +____ O2 --> 4H2O + 3 CO2
2
3
4
5
What type of chemical reaction is the following;
2H2O2 -->2 H2O + O2
Synthesis
Decomposition
Single replacement
Double replacement
Which of the following is an acid/ base reaction?
2H2 + O2 --> 2H2O
LiCl +NaF--> LiF + NaCl
HCl +NaOH --> NaCl + HOH
2Na + Cl2 --> 2NaCl
