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WorksheetsChemistry Semester 1 Review & Exam
Total questions: 50
Worksheet time: 34mins
Which of the following is one of the Expectations of Behavior?
Be Respectful
Be Quiet
Don't Play on Your Phone
Be a Leader
A __________ tells what is going to happen, while a ___________ tells you how or why it happened.
theory, law
law, theory
hypothesis, theory
law, hypothesis
The state of matter with relatively high heat, indefinite volume and indefinite shape is ___________.
solid
liquid
gas
plasma
Which diagram best shows the particles in a liquid?
a.
b.
c.
d.
The state matter is in tells you something about how much _____________ the particles in the matter have.
power
potential energy
density
kinetic energy
A student is given a sample of matter and asked to determine whether it is an element, compound, or mixture. The student discovers that he cannot separate the components physically, but he is able to separate it using chemical reactions into three different pure substances. The sample must be ______________________.
an element
a compound
a solution
a mixture
The word alloy goes in which position on the Types of Mixtures flowchart?
A.
B.
C.
D.
E.
What word goes in the space marked E on the Types of Mixtures flowchart?
solution
colloid
suspension
solute
A change that produces matter with a different composition is called a _____.
transformational change
physical change
radical change
chemical change
Which of the following statements is true?
Compounds are not pure substances because they are composed of two or more elements.
Compounds are pure substances because they contain only one element
Compounds are pure substances because each molecule has the same fixed composition.
Compounds are not pure substances because they can be decomposed.
To be valid an observation must be: (select all that apply)
quantitative
unbiased
reproucible
anecdotal
In a scientific explanation, the reasoning is/are the _________________________________.
scientific principles, measurements, formulas that describe why the evidence supports the claim
observations, data tables, graphs and pictures that support the explanation
statement that answers a question
How is a hypothesis tested?
By formulating a conclusion
By completing an experiment
By proposing an explanation to a question
By comparing two theories
Which of the following sentences is part of the evidence in the explanation given above?
Four objects of the same size can have different masses because matter is packed together more tightly in some materials than in others.
However, each has a different mass and density.
The Atomic Theory tells us that matter is made mostly of empty space, but that atoms with a larger nucleus will be smaller and have more mass
This allows smaller atoms with more mass to pack more matter into a volume then larger, less massive atoms.
Mass measures the amount of (a) in a substance or an object.
Eliot is given a sample of unknown liquid to test in the laboratory. Eliot thinks that the liquid is water, but he isn’t sure. Which of the following would be most helpful for Eliot to test in order to determine whether or not the liquid is water?
mass of the liquid
color of the liquid
boiling point of the liquid
volume of the liquid
A chemistry teacher places a piece of lithium (a dull grey metal) in water during a class demonstration. The lithium reacts vigorously with the water. After the reaction, the lithium appears to be gone. The teacher boils off the remaining water and all that is left is a white crystalline powder, which is most likely:
a compound made from the lithium and hydrogen and oxygen from the water chemically bonded to each other
a new element that is neither lithium nor water
a mixture of lithium, oxygen and hydrogen
a powdered form of the element lithium
The amount of space taken up by an object is called (a) .
In the International system, the basic unit for length is the (a) .
There are (a) fundamental units in the International System.
How many grams are in 0.52 kg?
(a)
Convert 528 feet into meters if 3.28 ft = 1 m. Your answer must include the correct units and the correcrt significant figures.
(a)
Precision reflects how close the measured value is to other _______________.
accepted values
known values
measured values
predicted values
This picture is..
Precise
Accurate
Accurate and precise
Neither accurate or precise
How many significant figures are in the number on the calculator?
(a)
While solving a problem with you calculator, you got the answer shown in the picture. You know your answer can only have 2 significant figures in. What number do you round the calculator's answer to to get the correct answer?
(a)
True or False: Density is the same regardless of size or shape of an object if both objects are made of the same material. (Example: a small round piece of copper and a large cube of copper)
True
False
What is the formula for density?
D=m×V
V=L×W×H
D=m÷V
D=m+V
Which scientist was famous for discovering the nucleus through the gold foil experiment?
Ernest Rutherford
Robert Millikan
John Dalton
Erwin Schrodinger
Which of the following was not one of the five statements included in John Dalton’s Atomic Theory?
Atoms of a given element are identical in size, mass, and other properties. Atoms of different elements differ in size, mass, and other properties.
Atoms are composed of a nucleus of nucleons surrounded by an electron cloud.
Atoms of different elements can combine in simple whole number ratios to form chemical compounds.
In chemical reactions, atoms are combined, separated, or rearranged.
The atomic model designed to explain the results of Thomson’s cathode ray tube experiments.
A.
B.
C.
D.
E.
This famous "oil drop experiment" was used to measure the mass and charge of the _______.
neutron
quark
electron
proton
This scientist used probability theory and wave equations to develop the quantum atomic theory.
Thomson
Milikan
Rutherford
Bohr
Schrodinger
What is the atomic number of this atom?
(a)
What is the atomic mass number of this atom?
(a)
What is the net charge of this atom?
(a)
How many electrons are in this atom?
(a)
How many neutrons are in this atom?
(a)
What is the isotope name of this atom?
Ruthenium
Ruthenium-96
Ruthenium-44
Ruthenium-140
Ruthenium-52
Which number specifically identifies the element?
Atomic mass number
Net charge
Atomic number
Electron number
The vast majority of the volume of the atom is found in the __________________.
gluons
nucleus
electron cloud
quarks
Why is the average atomic mass listed on the periodic table different from the actual atomic mass of the element?
the average atomic mass is calculated using the mass defect of the nuclei
the average atomic mass is calculated using the masses of the electrons
the average atomic mass is calculated using more accurate measurements
the average atomic mass is calculated using the masses of each naturally occurring isotope
From the diagram, which particles are indicated with the arrow?
electrons and protons
photons and nucleons
neutrons and protons
neutrons and electrons
Which of the following is true according to Bohr's model of the atom?
none of these
electrons do not orbit the nucleus
electrons orbit the nucleus in orbits at any distance from the nucleus
electrons orbit the nucleus in definite orbits
According to Bohr's model of the atom:
electrons in an atom can have any amount of energy
electrons absorb energy when they move from a lower energy level to a higher energy level
electrons can switch from one energy level to another by trading energy with other electrons
electrons release photons when they are excited from one enegry level to a higher one
According to Bohr’s theory, atoms emit specific light spectra because:
each atom has electrons of certain energies that produce specific photons
electrons excite from one energy state to a higher one and release that amount of energy as a photon
electrons relax from one energy state to another and release that amount of energy as a photon
they are trying to get rid of excess heat
The biggest problem with the Bohr's model of the atom is that:
it doesn't accurately explain any photons emitted by atoms
nothing, it's perfect
it doesn't explain why the electrons orbit in circles
it doesn't work for anything but hydrogen
Electrons in energy levels closer to the nucleus have ________ energy than/as electrons in energy levels further from the nucleus.
less
greater
the same
depends on the element
The picture shows the nuclear notation and Bohr model of an atom of Boron-10. The nuclear notation is correct, but there are two errors on the Bohr model. Select the two errors from the list below.
Wrong element symbol
Wrong number of protons
Wrong number of neutrons
Wrong number of electrons
Electrons placed in wrong order
The picture shows the nuclear notation and Bohr model of an atom of Nitrogen-15. The nuclear notation is correct, but there are two errors on the Bohr model. Select the two errors from the list below.
Wrong element symbol
Wrong number of protons
Wrong number of neutrons
Wrong number of electrons
Electrons placed in wrong order
