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Worksheets9-week exam review
Total questions: 47
Worksheet time: 4hrs 55mins
Which set correctly lists the types of electromagnetic radiation in order, from least to most energetic?
Ultraviolet, visible, infrared, microwave
Infrared, microwave, ultraviolet, x-rays
Ultraviolet, visible violet, visible red, infrared
Radio, microwave, ultraviolet, gamma
As the wavelength of a wave increases, which is also true?
The energy of the wave will increase.
The speed of the wave will increase.
The frequency of the wave will decrease.
Planck's constant will decrease.
A researcher uses a device to produce electromagnetic radiation at selected frequencies, and then measures the wavelength of each. When the results are plotted on a graph, she finds that a relationship between wavelength and frequency is
An inverse square ratio.
Directly proportional.
Inversely proportional.
Variable.
Using the electromagnetic spectrum to compare x-rays to visible light, which statement is true?
X-rays have a higher frequency and longer wavelength than visible light.
X-rays have a higher frequency and shorter wavelength than visible light.
X-rays have lower frequency and shorter wavelength than visible light.
X-rays have a lower frequency and longer wavelength than visible light.
What is the difference between an atom of uranium-238 and an atom of uranium-235?
The number of electrons
The number of neutrons
The number of protons
Their atomic numbers
A certain element sample is analyzed and found to consist of 11% of isotope X with a mass of 26 u, 10% of isotope Y with a mass of 25 u, and 79% of isotope Z with a mass of 24 u. What is the average atomic mass of the element?
75.0 u
25 u
24.32 u
24.00 u
Chromium has four naturally abundant isotopes. Based on its average atomic mass, if 4.35% is Cr-50, 9.50% is Cr-53, and 2.36% is Cr-54, which isotope constitutes the majority 83.79%?
Chromium-51
Chromium-52
Chromium-55
Chromium-56
Calculate the atomic mass of the unknown element X described above.
204 amu
206 amu
207 amu
208 amu
What does the following hyphen notation of Helium-3 mean?
An atom of Helium-3 has two protons, two electrons, and one neutron.
An atom of Helium-3 has one proton, two electrons, and three neutrons.
An atom of Helium-3 has two protons, two electrons, and three neutrons.
An atom of Helium-3 has two protons, two electrons, and two neutrons.
A sample of Element X is found to contain 72.15% of isotope type 1 (84.9118 amu) and 27.85% of isotope type 2 (86.9092 amu). Calculate the average atomic mass.
85.13 amu
85.47 amu
86.21 amu
86.49 amu
From which of the following atoms would it be the most difficult to remove an electron?
Sodium
Aluminum
Sulfur
Chlorine
Which of the following is the most reactive nonmetal?
Carbon
Fluorine
Nitrogen
Oxygen
Which of the following elemental sequence represents an increase in atomic size?
B, C, Na, Al, K
Na, K, B, Al, C
K, Na, Al, B, C
C, B, Al, Na, K
Which of the following elements has the greatest tendency to attract electrons?
Barium
Beryllium
Boron
Bromine
Which of the following statements is most accurate regarding atoms?
Most atoms cannot combine with other atoms.
Chemical reactions divide atoms into smaller units.
Atoms of the same element may have different mass numbers.
Atoms only contain protons.
In a famous experiment conducted by Ernest Rutherford, positively charged alpha particles were scattered by a thin gold foil. Which of the following is a conclusion that resulted from this experiment?
The nucleus is negatively charged.
The atom is a dense solid and is indivisible.
The mass is conserved when atoms react chemically.
The nucleus is very small and the atom is mostly empty space.
Which of the following is correct concerning subatomic particles?
The electron was discovered by Chadwick in 1886.
The proton was discovered by Rutherford in 1911.
The proton was discovered by Thomson in 1880.
The neutron was discovered by Dalton in 1932.
The cathode ray experiments led to which particle being discovered?
Nucleus
Proton
Neutron
Electron
Dalton's Atomic Theory, still the cornerstone of modern chemistry, has been changed because of the discovery of
Avogadro's number
Isotopes
The noble gases
Tetrahedral molecules
J. Priestly discovered that many carbon-containing materials burn in the presence of oxygen gas. However, the rest of the elements in the carbon family do not react the same way.
What explains this phenomenon?
Reactivity decreases going down a family.
Electron affinity increases going up a family.
The other elements in the family have a greater density.
Oxygen is a diatomic element that reacts with other reactive nonmetals.
The best explanation for the organization of Mendeleev's Periodic Table by atomic mass rather than atomic number is that —
atomic mass is unrelated to the chemical reactivity of elements
Mendeleev organized the table prior to the discovery of the atomic number
different isotopes of elements have different atomic masses
atomic numbers are not affected by the chemical reactivity of elements
A piece of gold foil was hit with alpha particles that mostly went right through the foil. This showed that the gold atoms are mostly empty space.
What is the physical property of gold that led Rutherford to select it for his experiment?
Gold is ductile.
Gold is unreactive
Gold can be flattened
Gold has a positive charge
Why is iodine found after tellurium on the Periodic Table even though its average atomic mass is lower for iodine?
Elements within a period have similar behaviors
Elements with a group have different chemical properties
Elements are arranged by atomic mass not atomic number
Elements are arranged by atomic number not atomic mass
According to periodic law, elements on the Periodic Table are arranged in order of their
Atomic mass
Atomic number
Number of electrons
Number of neutrons
Based on the information in the chart above, which element is most likely a member of Group 18?
Element V
Element W
Element X
Element Y
Which element is considered a noble gas?
Argon
Hydrogen
Nitrogen
Oxygen
Which element is a member of the alkaline earth metals on the periodic table of elements?
Calcium
Fluorine
Lithium
Potassium
With respect to physical and chemical properties, which element is most similar to carbon?
Boron
Germanium
Nitrogen
Silicon
What is the result of removing electrons from a neutral atom?
A cation
A different element
An acid
An anion
Which of the following showed electrons in specific, fixed orbits?
Rutherford Model
Planck Model
Bohr Model
Quantum Model
What does the Bohr model contribute to the theory on the structure of the atom?
Electrons are arranged in specific energy levels around the atom.
Atoms are made of electrons, protons, and neutrons.
Valence electrons describe an atom’s reactivity.
Atoms have a central positively charged nucleus.
Scientists, including Ernest Rutherford, started testing atomic structure theory in the early 1800’s. What was Rutherford’s key contribution to the atomic theory of matter?
Elements can form compounds.
Electrons orbit a central nucleus.
Electrons are negatively charged particles.
Matter cannot be divided infinitely and retain its properties.
Which of the following describes the phase change in which a gas becomes a liquid?
Condensation
Crystallization
Fusion
Sublimation
Describe one chemical change and one physical change in a burning candle.
A chemical change is producing heat, and a physical change is emitting light in a burning candle.
A chemical change is producing heat, and a physical change is melting wax in a burning candle
A chemical change is melting wax, and a physical change is producing heat in a burning candle.
A chemical change is melting wax, and a physical change is emitting light in a burning candle.
Which of the following best describes the phase change represented by the equation
N2(liquid) + heat ⟶ N2 (gas)Boiling
Condensation
Melting
Sublimation
Which process is an example of a chemical change?
Boiling water
Combustion of wood
Crystallization of sugar
Melting of steel
Which of the following is best described as the transition of a substance from a solid to a liquid?
Freezing
Liquidation
Melting
Vaporization
These blocks have all been spray painted the same color. How would you determine whether any 2 or more of these 4 blocks are made of the same material?
Compare their densities.
Compare their masses.
Compare their shapes.
Compare their volumes.
Ethylene glycol is a liquid commonly found in antifreeze. It has a density of 1.114 g/mL at 20.00 degrees C. If 500.0 mL is needed for the average car's radiator, which of the following best represents the mass required?
27.90 g
557.0 g
11140 g
1154.0 g
In the table, a student has recorded observations and data about a copper cylinder. The cylinder is sliced into 2 even pieces. What is the density of piece A?
4.5 g/cm3
5 g/cm cubed
9 g/cm cubed
18 g/cm cubed
Four samples of aluminum metal are shown. Which of the following is an intensive property of Al?
Density
Mass
Shape
None of these
A chemistry student’s investigation is described above. The student determines that the unknown substance is sodium chloride. Which of the following is an extensive property of sodium chloride?
Mass of 15 g
White color
Density of 2.17 g/cm cubed
Solubility in water
Which statement best describes why a gas is easily compressible while most solids are incompressible?
The molecules of a gas are much smaller than those of a solid.
The molecules of a solid are not attracted to one another.
The molecules of a gas are much further apart than those of a solid.
The molecules of a solid are much larger than those of a gas.
Indefinite shape and definite volume describe which state of matter?
Liquid state
Solid state
Plasma state
Gaseous state
Which type of substance cannot be broken down into simpler substances by a chemical change?
Solutions
Compounds
Mixtures
Elements
What conclusion can be drawn from the investigation shown in this diagram?
Salt water can be changed into pure water by chemical means.
Salt water is a chemical combination of two or more elements.
Salt water is a compound of two or more substances.
Salt water is a mixture of two or more substances.
Students investigating four liquid samples recorded the following observations. Which of the samples is definitively identifiable as a pure substance?
Sample W
Sample X
Sample Y
Sample Z
