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Worksheets9th Science Exam Review
Total questions: 58
Worksheet time: 34mins
What is the density of a sample of liquid that has a volume of 125 mL and a mass of 200 g?
75 g/ml
16 g/ml
1.6 g/ml
0.625 g/ml
You put a spoonful of salt into 1 liter of water and stir. The resulting liquid is an example of a(n) *
a heterogeneous mixture that can be separated by physical means
a heterogeneous mixture that can be separated by chemical means
a homogenous mixture that can be separated by physical means
a homogenous mixture that can be separated by chemical means
The smallest unit of an element that maintains the properties of that element is a(n)
molecule
atom
substance
compound
Which of the following can be broken down into simpler substances by either chemical or physical means? Check all that apply. *
elements
compounds
homogeneous mixture
heterogeneous mixture
Check all that apply to the properties of reactivity and flammability. *
Physical Property
Chemical Property
Can be observed without changing the identity of the substance
Cannot be observed without changing the identity of the substance
Check all that apply to the properties of melting point and density. *
Physical Property
Chemical Property
Can be observed without changing the identity of the substance
Cannot be observed without changing the identity of the substance
Which of the following would be considered heterogeneous mixtures? Check all that apply. *
Sugar water
Pepsi
Italian salad dressing
Chicken soup
The components of ____ can be physically separated because they are not chemically combined. Check all that apply.
compounds
elements
homogeneous mixture
heterogeneous mixture
Which of the following are physical changes? Check all that apply. *
dissolving salt in water
cooking an egg
rusting iron
melting ice
separating black ink into its component colors
How can a chemical change be reversed? *
by another chemical change
by physical changes
by both chemical and physical changes
chemical changes cannot be reversed
A change in color and fizzing/foaming are often signs that a _____ reaction has occurred. *
Physical
Chemical
Unlike a mixture, a pure substance has *
atoms
molecules
a specific size
a fixed composition
A substance has a mass of 360 g and a volume of 7.5 mL. What is its density?
2700 g/ml
480 g/ml
270 g/ml
48 g/ml
If you have a sample of copper that has a volume of 6 cubic centimeters, which of the following is the best estimate for what its mass will be? *
30 g
40 g
50 g
60
Which substance has the greatest density? *
mercury
water
benzene
They all have equal densitys
Which substance would float in water?
mercury
benzene
Each substance has a fixed density. Are the mass and volume directly proportional or indirectly proportional for fixed density?
directly
indirectly
Evaporation
Gas becomes liquid
Liquid becomes gas
Solid becomes liquid
Sublimation
Solid becomes a gas
Solid becomes a liquid
the liquid becomes a gas
Condensation
Solid becomes liquid
Gas becomes a liquid
Gas becomes solid
Liquid becomes a gas
Freezing
gas becomes a solid
solid becomes a liquid
the liquid becomes a solid
Melting
Solid to a liquid
Liquid to a gas
Gas to a liquid
When energy is added to water, it heats up and a line graph displays a _____ slope. When the water actually boils, a line graph will display a ____ slope. *
first blank: negative; second blank: positive
first blank: negative; second blank: zero
first blank: positive; second blank: zero
first blank: zero; second blank: negative
Charles's law relates the volume of a gas to its *
container
pressure
composition
temperature
When pressure increases on a sample of gas, the gas will
increase in volume
decrease in volume
An upward force equal to the weight of the displaced fluid exerts a(n) ___ force on any object immersed in or floating on a fluid. *
strong
weak
buoyant
gravitational
When an object floats, the buoyant force is equal to or greater than the ____ of the object's displaced fluid.
volume
weight
pressure
tempature
The law relating the pressure of a gas to its volume is ___.
Pascals Principle
Archimedes principle
Boyles law
Charles law
One of the gas laws states that if a fixed sample of gas increases in temperature, at constant pressure, its volume ______. *
stays the same
decreases
increases
decreases than increases
Which of the following changes of state require energy to be absorbed or taken in?
evaporation
sublimation
condensation
freezing
melting
Which of the following changes of state require energy to be released? *
evaporation
sublimation
condensation
freezing
melting
At letters B and D, which of the following are occurring?
A temperature change is occurring
A change state is occuring
Temperature is remaining constant
A chemical changes is occurring
Which statement about the atom's nucleus is correct?
The nucleus can contain protons and neutrons and has a negative charge
The nucleus can contain protons and neutrons and has a positive charge.
The nucleus can contain protons and electrons and has a neutral charge.
The nucleus can contain electrons and neutrons and has a negative charge.
Which of the following descriptions applies to the model of the atom above? *
Atoms are solid indestructible units, much like billiard balls.
Solid atoms consist of uniform, positively charged substance containing small electrons in it.
A small, dense centrally-located nucleus is surrounded by negatively charged electrons in empty space.
Electrons orbit the nucleus at certain specific distances and have spectific energies.
Which statement about the modern model of the atom is NOT true?
Electrons can be found between energy levels.
Electrons can be found only in certain energy levels.
The precise location of electrons cannot be predicted.
Electrons are most likely found in orbitals.
According to _____ model of the atom, electrons behave like _____.
first blank: Bohr's; second blank: planets orbiting the sun.
first blank: Dalton's; second blank: planets orbiting the sun.
first blank: Rutherford's; second blank: plum pudding.
first blank: Thomson's; second blank: plum pudding.
Oxygen's atomic number is 8. This means that an oxygen atom has... *
eight neutrons in its nucleus.
a total of eight protons and eight neutrons in its nucleus.
eight protons in its nucleus.
eight electrons surrounding its nucleus.
Isotopes of an element have the same ____, but a different _____. *
first blank: mass numbers
second blank: mass numbers
first blank: atomic numbers
second blank: atomic numbers
Protons
negative charge
positive charge
electrons
negative charge
positive charge
neutrons
No charge
Positive charge
negative charge
The charge of an atom is...
positive
neutral
negative
unbalanced
An iron atom (Fe) has an atomic number of 26, and a mass number of 56. How many neutrons does the iron atom have? *
30
56
26
82
An element's atomic number is equal to its number of... *
neutrons
protons
electrons
protons + neutrons
Two different isotopes of an element have different... *
number of protons
number of neutrons
atomic number
mass number
What is the mass number of an element that has 19 protons, 19 electrons, and 20 neutrons? *
19
20
39
58
The order of elements in the modern periodic table is based on an element's *
atomic number
name
chemical symbol
atomic mass
Elements within the same group in the periodic table have similar properties because they have the same number of *
protons
neutrons
ions
valence electrons
Check all that apply to Group 18 (noble gases) *
are highly reactive
stable
have a full outer electron level
have 7 valence electrons
Which statements about the alkali metals are correct?
They are located in the left-most column of the periodic table.
they are extremely nonreactive.
They form positive ions with a 1+ charge.
They form negative ions with a 1- charge.
____ are the two most reactive groups on the periodic table
halogens
alkali metals
transition metals
noble gases
This Bohr model represents which element? (You must spell the name of the element correctly) *
(a)
Which element would have two fewer valence electrons than oxygen? (You must spell the name of the element correctly) *
(a)
Metals tend to be ductile and malleable. What do these two properties mean?
can be drawn into wire
brittle
shiny
can be hammered into a shape
conduct electricity and thermal energy
Which of the following describes the number of electrons found in each energy level in a Bohr Model of the element Calcium? (Energy levels are separated by commas) *
2,8,8,2
2,8,10
2,10,8
8,8,4
Which pair of elements is most likely going to have a similar arrangement of outer electrons and have similar chemical behaviors?
Boron and Neon
Aluminum and Chlorine
Carbon and Nitrogen
Fluorine and Chlorine
Which of the following would be the ion Magnesium would form?
Mg+
Mg-
Mg2+
Mg2-
If an electron is added to an Iodine atom, what would Iodine become? *
cation
anion
