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WorksheetsSLO Post Test
Total questions: 50
Worksheet time: 25mins
A scientific law is
is the same as a hypothesis
a description of a natural event (gravity, Boyle's law)
a theory
none of the above
A hypothesis is tested by
only scientists
only high school students
performing experiments
none of the above
A scientific model is
a person who wears trendy clothes
a representative of real events or objects
a new theory
none of the above
Anything that has mass and takes up space is
matter
in the way and a nuisance
mass
none of the above
An example of a heterogeneous mixture is
water (H2O)
trail mix
lemonade
none of the above
An example of a homogeneous mixture is
lemonade
trail mix
water (H2O)
none of the above
A pure substance is
water (H2O)
air
vinegar and oil salad dressing
none of the above
Which is not a sign of a chemical change occurring?
bubbling
tearing of paper
production of heat
production of a precipitate
The resistance of a fluid to flow is called
stubbornness
being pig headed
viscosity
none of the above
There are four states of matter: solid, liquid, gas &
plasma
condensation
evaporation
all of the above
The law of conservation of mass states that mass cannot be
measured
created or destroyed
seen
all of the above
The unit for electrical resistance is
volts
amperes
ohms
none of the above
The units for electrical voltage are
amperes
volts
ohms
none of the above
The units for current are
amperes
volts
ohms
none of the above
What is the opposition to the flow of electrons called?
current
voltage
resistance
none of the above
What is the force or push of electrons through a conductor called?
voltage
resistance
current
none of the above
_________ is the rate of flow of electrons through a conductor.
Current
Voltage
Resistance
none of the above
Electroscopes detect
current electricity
static electricity
Tesla coils
none of the above
H2 + O2 → H2O is a
synthesis reaction
single replacement reachtion
double replacement reaction
none of the above
H2O → H2 + O2 is a
synthesis reaction
decomposition reaction
single replacement reaction
none of the above
NaCl + AgF → NaF + AgCl
single replacement
double replacement
combustion
none of the above
CuCl2 + Al → AlCl3 + Cu is a
single replacement reaction
combustion reaction
synthesis reaction
none of the above
Which set of coefficients can be used to balance the following equation: NaCl + H2SO4 → Na2SO4 + HCl
2, 2, 2, 2
2, 1, 1, 2
1, 1, 1, 2
none of the above
Chemical energy is stored in the ________ formed between elements.
bonds
molecules
electrons
none of the above
The elements or compounds that enter a reaction are called the
reactants
products
energy
none of the above
The elements or compounds that are made during a reaction are called the
reactants
products
energy
none of the above
Sodium has 1 valence and chlorine has 7 valence electrons. When they chemically combine, they will form an _______ bond by _________ their electrons.
covalent, sharing
ionic, transferring
They will not bond
none of the above
Carbon has 4 valence electrons and oxygen has 6 valence electrons. When they combine they will form a ______ bond by ______ their electrons.
covalent, sharing
ionic, transferring
they will not combine
none of the above
Why do atoms form bonds with other atoms?
to become friends
to become stable by getting 8 valence electrons
to break up
none of the above
The three types of elements are
metals, nonmetals, metalloids/semiconductors
metals and nonmetals
solids, liquids, and gases
none of the above
Atoms that gain valence electrons are called
anions
cations
isotopes
none of the above
Atoms that lose valence electrons are
anions
cations
isotopes
none of the above
Each column of the periodic table is
an element
a period
a family
none of the above
Each of the rows in the periodic table are
families
periods
groups
none of the above
Mendeleev left gaps in his periodic table because
there were no known elements to fill in the gaps at that time
he missed some elements
his helper needed to do the work
none of the above
Mendeleev's periodic table used atomic mass to determine order; today we use the atom's atomic __________.
symbol
mass
number
none of the above
An atom's atomic number is always the number of
protons
neutrons
electrons
none of the above
The atomic mass is number of
protons and neutrons
protons and electrons
electrons and protons
none of the above
Why do atoms not have an overall charge?
they are not good conductors of electricity
they have equal number of protons and electrons
they are ions
none of the above
The way an atom behaves or reacts is due to its
valence electrons
neutrons
protons
none of the above
This subatomic particle has a positive charge and lives in the nucleus of an atom.
proton
neutron
electron
none of the above
This subatomic particle has a negative charge and lives in the electron clouds.
proton
neutron
electron
none of the above
This subatomic particle has no charge and lives in the nucleus of an atom.
proton
neutron
electron
none of the above
Iron has an atomic number of 26 and an atomic mass of 56, how many protons, neutrons and electrons does it have?
26, 30, 26
30, 26, 26
26, 56, 30
none of the above
The steps of the scientific method all begin with an
hypothesis
question
observation
none of the above
Calculate the resistance of a bulb that draws 1 amp of current and has a potential difference of 3 volts.
3 ohms
3 volts
3 amps
none of the above
Determine the current if a 12 volt battery flows through a 2 ohms of resistance.
6 ohms
6 amps
6 volts
none of the above
Determine the voltage used when the current is 0.25 amps and the resistance is 48 ohms.
12 amps
12 volts
12 ohms
none of the above
The metric unit for mass is
kilogram
pound
ounces
none of the above
How many significant figures are in 7357?
4
3
2
none of the above
