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WorksheetsChem 3rd Quarter review
Total questions: 27
Worksheet time: 14mins
Which of the following best explains why CO2 gas is easily compressible but solid CO2 (dry ice) is incompressible?
The molecules of CO2 gas are much closer together than the molecules in dry ice.
The molecules of solid CO2 are much closer together than the molecules of CO2 gas.
The molecules of CO2 gas are much smaller than the molecules of solid CO2 .
The molecules of CO2 gas attract one another, while the molecules of the solid
CO2 repel one another.
X-ray crystallography is a technique that allows scientists to determine the ionic and atomic radii of elements. Which of these statements correctly describes a trend in ionic or atomic radii in the periodic table?
The ionic radius decreases from top to bottom in a group.
The atomic radius increases from left to right across a period.
The ionic radius remains constant from right to left across a period.
The atomic radius increases from top to bottom in a group.
Which of the following displays an incorrect relationship?
energy and frequency are related inversely
frequency and energy are related directly
wavelength and frequency are related inversely
wavelength and energy are related inversely
Which of the following relationships are incorrect?
As wavelength increases frequency decreases
As wavelength increases energy decreases
As frequency decreases energy decreases
As frequency decreases energy increases
As a distant star moves away from Earth, the light given off by the star has a measurably lower frequency. What happens to the wavelength and energy of the photons of light when the frequency becomes lower?
The wavelength becomes longer, and the energy decreases.
The wavelength becomes shorter, and the energy decreases.
The wavelength becomes longer, and the energy increases.
The wavelength becomes shorter, and the energy increases.
Define ionization energy
The energy of the oxidative state of an atom's ions
The ability of an atom to attract electrons when the atom is in a compound
An ion's size
The energy required to remove an electron from an atom
Which of these statements is an accurate description of the ionization energies of elements in the periodic table?
The ionization energy of lithium is greater than that of potassium
The ionization energy of iodine is greater than that of fluorine
The ionization energy of magnesium is greater than that of sulfur
The ionization energy of krypton is greater than that of neon.
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What is the trend for ionization energy?
Increases as you go across the periodic table, increases as you go down the periodic table.
Decreases as you go across the periodic table, decreases as you go down the periodic table
Increases as you go across the periodic table, decreases as you go down the periodic table
Decreases as you go across the periodic table, increases as you go down the periodic table.
What does molecular geometry mean?
The type of compounds that an element will react with
The shape of the compound
The 2 dimensional lewis dot structure of a compound
The charge of a compound?
What information do you not need to know in order to determine a compound's VSEPR Model?
The number of central atoms
The charge of the central atom
The number of electron pairs on the central atom
The number of atoms bonded to the central atom 19
Which of the following correctly matches a compound with its molecular geometry?
Water (H2O): linear
Carbon dioxide (CO2): tetrahedral
Ammonia (NH3): trigonal planar
Methane (CH4 ): tetrahedral
What is the electron configuration for an atom of germanium at ground state?
[Ar]4s2 3d10 4p2
[Ar]4s2 4d10 4p2
[Kr]4s2 3d10 4p2
[Kr]4s2 4d10 4p2
Which of the following best explains why metals are capable of transferring heat?
The electrons in a metallic bond are in an electron sea where they do not belong to any one atom, so they are free to move around
The electrons in a metallic bond are in an electron sea where they are rigid and unable to move, so the heat transfers over top of the atoms
The physical bonds of metallic bonds are malleable so they are able to move around the increased flow of electrons when they are heated.
Metals tend to be shiny, so when the sun hits off of them their electrons transform to an excited state which spreads like a virus throughout the rest of the material.
Helium has an electron configuration of 1S2, what does that indicate?
Helium is in the first energy level. It has two electrons in an s orbital.
Helium is in the first energy level. It has one electron in the s orbital .
Helium is in the second energy level. It has one electron in the s orbital.
Helium is in the second energy level. It has one s orbital and there are two electrons in it.
Chemists can identify the composition of some unknown salts by conducting a flame test. When potassium salts are heated in a flame, a purple color is observed. This is due to the movement of electrons between energy levels. What is the electron configuration of a potassium atom at ground state?
1s2 2s2 2p6 3s2 3p6 4d1
1s2 2s2 2p6 3s2 3p6 3d1
1s2 2s2 2d6 3s2 3d6 4s1
1s2 2s2 2p6 3s2 3p6 4s1
Which of the following best describes what an element's electron configuration is?
The reasoning behind the element's molecular geometry.
The description of an element's location on the periodic table
The charge of an electron at ground state and excited state
The description of an electron's orbitals at ground state
Which type of bonding would have the physical property of malleability associated with it?
Ionic bonds
Metallic bonds
Covalent bonds
Polar bonds
Which of the following diagrams correctly represents the formation of a compound consisting of magnesium and fluorine?
Which of these is the electron-dot diagram for Br (l)?
Which of the following best explains why the periodic table is arranged the way it is?
Horizontal groups have similar chemical and physical properties.
Vertical groups have similar chemical and physical properties.
Elements are arranged based on their order of discovery
Elements are arranged from left to right in order of their reactivity.
Elements in a group of the periodic table are described above. These elements most likely belong to which group?
Alkali Metals
Alkaline Earth Metals
Halogens
Noble Gasses
A scientists has discovered a new element. This element is gaseous in nature and does not react under normal conditions with any other element or compound. Which group on the periodic table would this scientist most likely place this element?
Group 1
Transition Elements
Noble Gasses
Group 3
Sodium, mercury, argon, and neon are used in the production of lamps. There are fewer safety guidelines regarding the handling of neon and argon than for mercury and sodium. Which of the following best describes the elements within the group of the periodic table that contains neon and argon gas?
Gaseous at room temperature and highly reactive with metals
Solid at room temperature and mildly reactive with strong acids
Gaseous at room temperature and mostly unreactive with metals
Solid at room temperature and mostly unreactive with strong acids
Which of the following most accurately describes the difference between ionic and covalent bonds?
Ionic bonds occur when a metal and a non-metal share electrons.
Ionic bonds occur when two non-metals share electrons.
Ionic bonds occur when a metal transfers electrons to a non-metal.
Ionic bonds occur when two non-metals transfer electrons to each other.
Which of the following would not be found in a covalent lewis dot structure?
Charges
Sharing of electrons
Molecular Geometry
A centralized atom
Which of the following shows a correct Lewis dot structure?
Which of the following best represents the lewis dot structure for elemental Bromine?
