NEW
Font size
Worksheets21-22 Physical Science Midterm Review
Total questions: 73
Worksheet time: 24mins
Which of the following allows the scientist to show trends in data over time?
graph
hypothesis
operational definition
scientific investigation
What is the purpose of the control group for an experiment?
It gives the scientist more to do
Scientists enjoy controlling things
There is no purpose for the control
It is used as the point of comparison for the experiment so the scientist knows if the independent variable has caused a change
The steps commonly used by scientists in gathering information to test hypotheses and solve problems is called the…
descriptive research
pure science
applied science
scientific method
When graphing data, the independent variable always goes _______.
On the Y axis
On the X axis
Within the graph grid
Above the graph grid
Good experimental procedures will be written...
In alphabetical order
In a step-by-step fashion
In paragraph form
Using symbols and equations
Which of the following is NOT a feature of a good experimental method?
The number of test subjects and trials are stated
The amount of materials and substances needed are stated
The tools needed and specific measurements that should be taken are stated
The procedures are not given so the scientist has freedom to be creative
Why do scientists analyze the data collected during an experiment?
To determine relationships between variables
To determine the reliability of the results
To help form a hypothesis
Both a and b
If you are performing a lab experiment, what should you do if your clothing catches on fire?
run screaming to the teacher
suffer in silence so you don’t disrupt the class
Wrap in a fire blanket, stop-drop-roll, use a fire extinguisher, or submerge the clothes in water
throw nearby objects at students to get their attention
What is the proper technique for smelling something in the laboratory?
Put your nose at the top of the beaker and breathe in
Never smell anything in lab
Using your hand, waft the air over the beaker towards your nose (wafting)
Hold the beaker at a distance and breathe in
A hypothesis that is proven wrong by an experiment, even if the hypothesis is a well-educated guess, is a bad hypothesis because it is disproved.
True
False
Metalloids are found on the _____ of the periodic table.
left side
right side
along the stairway line
corner
Unstable isotopes decay and give off _________.
electrons
Isotopes
radiation
radon
The picture shows a model of which element?
Helium
Lithium
Boron
Carbon
How many neutrons are in Silicon- 30? (Remember this Silicon has an atomic mass of 30 g).
14
13
16
15
Which family of elements makes up the most reactive group of all metals?
transition metals
alkaline earth metals
alkali metals
noble gases
Which of the following elements is a metalloid?
phosphorus
tin
Boron
lead
Which of the following consists of eight elements that make up the stair step of the periodic table?
metals
nonmetals
metalloids
none of the elements
Where is the neutron located within the atom?
nucleus
electron cloud
outside of the atom
around the atom
How do you calculate the number of neutrons in an atom?
mass number - atomic number
it equals the mass number
atomic number - electrons
it equals the atomic number
Which element has 15 protons?
Carbon
Phosphorus
argon
magnesium
What is the charge of the electron?
negative
positive
neutral
What is the charge of the neutron?
negative
positive
neutral
What is the charge of the proton?
negative
positive
neutral
The order of elements on the periodic table is based on
number of protons (atomic number)
nothing, it is completely random
number of neutrons
atomic mass
Atoms bond with other atoms to become _____.
positively charged
negatively charged
more stable
more reactive
When a reaction occurs and the products are colder than the reactants it is an
exothermic reaction
endothermic reaction
What is the chemical formula for the covalent compound carbon trichloride?
CCl
3CCl
CCl3
C3Cl
What is the correct formula for magnesium phosphide?
MgP
Mg3P2
Mg1P
Mg2P3
The starting substances in a reaction are called...
products
yields/produces
reactants
coefficients
subscripts
The final substances in a reaction are called...
products
yields/produces
reactants
coefficients
subscripts
The Law of Conservation of Matter states
matter cannot be created or destroyed, it simply changes form
matter can be created so we do not run out
matter can be destroyed making room for additional matter
matter should always be conserved and not wasted
Chemical equations must be balanced because
you must have the same number of each type of atom on both sides of the reaction to meet the Law of conservation of matter
energy must be conserved
the total number of atoms on both sides must equal 10
all of the other answers are correct
A reaction in which two compounds trade elements is...
synthesis
decomposition
single displacement
double displacement
A reaction in which two or more substances combine to produce one product is...
synthesis
decomposition
single displacement
double displacement
What type of reaction is
3 O2 + 4 Fe --> 2 Fe2O3?
synthesis
decomposition
single displacement
double displacement
What type of reaction is
2 KClO3 --> 2 KCl + 3 O2?
synthesis
decomposition
single displacement
double displacement
What coefficient goes in front of oxygen in order to balance the equation?
___O2 + 4 Fe --> 2 Fe2O3
1
2
3
4
What coefficient needs to go in front of KCl in order to balance the equation?
2 KClO3 --> _____KCl + 3 O2
1
2
3
4
What coefficient needs to go in front of H2 in order to balance the equation?
Mg + 2 HCl --> MgCl2 +___H2?
1 ( meaning don't add a coefficient here)
2
3
4
A positive or negative number that indicates how many electrons an atom has gained, lost or shared.
oxidation number
ionic number
compound number
electron number
Matter is defined as anything that
can be seen and touched
has mass and takes up space
can be weighed
contains both kinetic and potential energy
A(n) _____________ is a substance formed from two or more elements that are chemically combined in a set ratio
element
compound
atom
plasma
Which is an an example of a colloid?
lotion
vegetable soup
italian dressing
snow globe
Which of the following is a suspension?
suntan lotion
vegetable soup
milk
cool whip
Oxygen would be classified as a(n)
element
compound
homogenous mixture
heterogenous mixture
Burning paper is a
chemical property
physical property
chemical change
physical change
Boiling point and freezing point are both examples of a
chemical property
physical property
chemical change
physical change
When salt is dissolved in water, the water is the
solute
solvent
indicator
base
A substance that undergoes a___________ change is still the same substance after the change
physical change
science change
chemical change
quick change
Liquid A has a density of .86g/ml and liquid B has a density of 1.22 g/ml. What will happen when both liquids are poured into a container?
Liquid A floats on top of liquid B
Liquid B will float on top of liquid A
Nitrogen has 7 protons, 7 neutrons, and 7 electrons. What is the mass number?
42
7
14
27
Metals are found on the _____ of the periodic table.
left side
right side
along the stairway line
corner
Nonmetals are found on the _____ of the periodic table.
left side
right side
along the stairway line
corner
Which of the following elements contains 16 electrons and 16 neutrons?
Bohrium
Tungsten
Sulfer
Xenon
Which substance would require the least amount of energy to increase its temperature by 1 K?
Lead
Ehanol
Ammonia
Water
Which substance will take the longest to heat up?
Aluminum
Gold
Ethanol
Water (liquid)
Moving from a solid to a gas is..
freezing
melting
sublimation
vaporization
Moving from a solid to a liquid is called...
melting
sublimation
vaporization
condensation
Moving from a liquid to a gas is called..
melting
vaporization
sublimation
condensation
At which phase is an object’s kinetic energy at its lowest?
solid
liquid
gas
A cup of coffee burning your hand is because of this type of heat transfer:
conduction
convection
radiation
Getting hot from sitting in the sun in from this type of heat transfer:
conduction
convection
radiation
What will turn blue litmus paper red
an acid
a base
a neutral substance
water
Which of the following form hydrogen ions in solution?
Acid
base
A base forms which ions in solution?
hydrogen
oxygen
hydroxide
carbon monoxide
Which of the following is Not true about the pH scale?
pH range is from 0-14
acids have a pH greater than 7
bases have a pH greater than 7
pure water has a pH of 7
Which would not increase increase the rate at which you dissolve powdered drink mix into a pitcher of water
heating the mixture
stirring the mixture
breaking up big pieces of the powdered mix
adding more powdered drink mix
A pH of 1 would indicate a strong
acid
base
neural substance
Which of the following pH measurements indicate the strongest acid given?
1.3
8.5
5.4
9.5
What substance in the graph provided is a saturated solution when 100g is dissolved at 20 degrees Celsius in 100g of water?
NaCl
KBr
KNO3
NaClO3
At 40°C, 40 grams of KNO3 is added to 100 grams of water. What will happen if an additional 20 grams of KNO3 is added to the solution?
All 20 grams will dissolve and the solution will be saturated
10 grams will dissolve and 10 grams will settle to the bottom of the solution
All 20 grams will settle to the bottom of the solution, it will not dissolve.
How does kinetic energy change when the temperature of an object increases?
There is no change
it increases
it decreases
Gas to a liquid is called
melting
sublimation
freezing
condensation
