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Test your basic knowledge |
CLEP Chemistry: Structure Of Matter
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clep
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science
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chemistry
Instructions:
Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.
This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. Theory of bonding that states that covalent bonds form through the spatial overlap of orbitals containing valence electrons. Valence bond theory is consistent with the geometric predictions of VSEPR theory.
Atomic Number
Valence bond theory
Sigma (s) bonds
Atomic Spectrum
2. A ___ ___ is the attractive interaction of a hydrogen atom and an electronegative atom - such as nitrogen - oxygen or fluorine - that comes from another molecule or chemical group. The hydrogen has a polar bonding to another electronegative atom to c
Atomic Theory
Covalent Bond
Coarse Dispersion (Suspension)
Hydrogen Bond
3. A ___ ___ is an atom or ion (usually metallic) - bound to a surrounding array of molecules or anions - that are in turn known as ligands or complexing agents. Many metal-containing compounds consist of coordination complexes.
Coordination Complex
Atomic Number Example
Determination of atomic masses by chemical means
The Periodic Table
4. Electrons in a (p) orbital (either bonding or nonbonding).
The Periodic Table
Quantum Numbers
Colloid
Pi (p) electrons
5. Is a mathematical function describing the wave-like behavior of an electron in a molecule. This function can be used to calculate chemical and physical properties such as the probability of finding an electron in any specific region.
Electronegativity
Sigma (s) bonds
molecular orbital (MO)
Determination of atomic masses by physical means
6. In chemistry - the ____ ____ is an indicator of the degree of oxidation of an atom in a chemical compound. The formal oxidation state is the hypothetical charge that an atom would have if all bonds to atoms of different elements were 100% ionic. Oxid
Oxidation State
Distinction between Periods and Groups
Structural Isomers
Dispersion
7. The ___ ___ of a chemical element is a measure of the size of its atoms - usually the mean or typical distance from the nucleus to the boundary of the surrounding cloud of electrons. Since the boundary is not a well-defined physical entity - there ar
Molecular Model
Metallic Bond
Atomic Radius
Mass Number/Atomic Mass Number
8. An ___ ___ is a type of chemical bond formed through an electrostatic attraction between two oppositely charged ions. Ionic bonds are formed between a cation - which is usually a metal - and an anion - which is usually a nonmetal
Mass Number Example
Ionic Bond
resonance or mesomerism
Coordination Complex
9. A ___ ___ - in this article - is a physical model that represents molecules and their processes. The creation of mathematical models of molecular properties and behavior is ___ ___ - and their graphical depiction is molecular graphics
Molecular Model
Coordination Complex
Atomic Weight
Hydrogen Bond
10. Is the concept of mixing atomic orbitals to form new hybrid orbitals suitable for the qualitative description of atomic bonding properties. ___-ed orbitals are very useful in the explanation of the shape of molecular orbitals for molecules. It is an
hybridisation (or hybridization)
Mass Number/Atomic Mass Number
Electron Energy Levels
Sigma Bond
11. Examples: the isotope effect is used so extensively to investigate chemical mechanisms and the use of cosmogenic isotopes and long-lived unstable isotopes in geology that it is best to consider much of isotopic chemistry as separate from nuclear chem
Macromolecule
Quantitative structure-activity relationship models
Quantum Numbers
Applications of Nuclear Chemisty
12. (1) A sample is loaded onto the MS instrument and undergoes vaporization (2) The components of the sample are ionized by one of a variety of methods (e.g. - by impacting them with an electron beam) - which results in the formation of charged particle
resonance or mesomerism
Oxidation State
Hydrogen Bond
Mass Spectrometry (MS) Procedure
13. Atoms of the same element can have different numbers of neutrons; the different possible versions of each element are called isotopes. For example - the most common isotope of hydrogen has no neutrons at all; there's also a hydrogen isotope called de
Isotopes
Molecular Model
Chemical Bond
Valence bond theory
14. Is the process by which an atomic nucleus of an unstable atom loses energy by emitting ionizing particles/radiation. A decay - or loss of energy - results when an atom with one type of nucleus - called the parent radionuclide - transforms to an atom
Isotopes Example
Radioactive decay
Covalent Bond
Hybridization
15. The ___ ___ of a chemical species - i.e. an atom or molecule - is the energy required to remove electrons from gaseous atoms or ions. The property is alternately still often called the ionization potential - measured in volts. In chemistry it often r
Coordination Complex
Ionization Energy
Coarse Dispersion (Suspension)
Evidence of Atomic Theory
16. Formation of hybrid orbitals - which are mixtures of individual atomic orbitals. The number of atomic orbitals used to create a set of hybrid orbitals equals the number of orbitals generated by ______. Hybrid orbitals can hold up to two electrons; ha
Hybridization
Electronegativity
Quantitative structure-activity relationship models
Atomic Weight
17. The periodic table of the chemical elements is a list of known atoms. In the table the elements are placed in the order of their atomic numbers starting with the lowest number. The atomic number of an element is the same as the number of electrons or
The Periodic Table
Atomic Orbit
Ionic Bond
Colloid
18. Bohr proposed that electrons orbited the nucleus - but the electrons contained enough energy to match the electric pull of the protons. This way - the atomic stability would be preserved. He also said that electrons could occupy only certain orbits -
Molecular Model
Pi (p) bonds:
Atomic Spectrum
Solution
19. If you want to refer to a certain isotope - you write it like this: AXZ. Here X is the chemical symbol for the element - Z is the atomic number - and A is the number of neutrons and protons combined - called the mass number. For instance - ordinary h
Oxidation State
Electronegativity
Dispersion
Isotopes Example
20. A ____ is a substance microscopically dispersed evenly throughout another substance.A colloidal system consists of two separate phases: a dispersed phase (or internal phase) and a continuous phase (or dispersion medium) in which the colloid is disper
Colloid
Valence shell electron pair repulsion (VSEPR) theory
Molecular Dipolar Moments
Metallic Bond
21. Bonds formed by the head-on overlap of sp - sp2 - or sp3 hybrid orbitals with each other or with hydrogen 1s orbitals.
Applications of Nuclear Chemisty
Sigma (s) bonds
Atomic Radius
Hydrogen Bond
22. A mechanism by which two atoms are held together as the result of the forces operating between them and a pair of electrons regarded as shared by them. In a ___ ___ - the electron pair occupies an orbital located mainly between the two atoms and symm
Sigma Bond
Applications of Nuclear Chemisty
Evidence of Atomic Theory
Radioactive decay
23. Even though the total charge on a molecule is zero - the nature of chemical bonds is such that the positive and negative charges do not completely overlap in most molecules. Such molecules are said to be polar because they possess a permanent ___ ___
Electronegativity
molecular orbital (MO)
Ionic Bond
Molecular Dipolar Moments
24. That's the number of protons in one atom of a particular element. An undisturbed atom is electrically neutral - so the number of electrons in it is the same as its atomic number. Example:
Pi (p) bonds:
Pi Bonds
Hybridization
Atomic Number
25. As a general term - the mass of an individual atom; but usually we mean the average atomic mass for the naturally occurring element - expressed in atomic mass units. hydrogen and oxygen combine to form water - H2O.The weight of oxygen has to be eight
Isotopes
hybridisation (or hybridization)
Determination of atomic masses by chemical means
Atomic Weight
26. Is a way of describing delocalized electrons within certain molecules or polyatomic ions where the bonding cannot be expressed by one single Lewis formula. A molecule or ion with such delocalized electrons is represented by several contributing struc
Valence shell electron pair repulsion (VSEPR) theory
Radioactivity
Sigma Bond
resonance or mesomerism
27. A row of elements across the table is called a period. Each period has a number: from 1 to 7. Period 1 has only 2 elements in it: hydrogen and helium. Period 2 and Period 3 both have 8 elements. Other periods are longer. A column of elements down the
Atomic Spectrum
Sigma Bond
Isotopes Example
Distinction between Periods and Groups
28. In chemistry - a ____ is a homogeneous mixture composed of only one phase. In such a mixture - a solute is a substance dissolved in another substance - known as a solvent. The solvent does the dissolving. The solution more or less takes on the charac
Solution
Valence shell electron pair repulsion (VSEPR) theory
Atomic Weight
molecular orbital (MO)
29. In chemistry - a ____ is a heterogeneous mixture containing solid particles that are sufficiently larger for sedimentation. Usually they must be larger than 1 micrometer(1mm). The internal phase (solid) is dispersed throughout the external phase (flu
Atomic Number Example
Coarse Dispersion (Suspension)
Molecular Dipolar Moments
Solution
30. __ __ are used to represent the decay of one element into another. show atomic # and mass # of particles involved. Mass numbers and atomic numbers are conserved.
Applications of Nuclear Chemisty
Mass Spectrometry (MS) Procedure
Nuclear Equations
Atomic Number
31. ____ - symbol ? - is a chemical property that describes the tendency of an atom or a functional group to attract electrons (or electron density) towards itself.
Electronegativity
Mass Spectrometry (MS) Procedure
Atomic Number
Oxidation State
32. A ___ ___ is a form of chemical bonding that is characterized by the sharing of pairs of electrons between atoms. The stable balance of attractive and repulsive forces between atoms when they share electrons is known as covalent bonding.
resonance or mesomerism
Mass Number Example
Electronegativity
Covalent Bond
33. A ___ ___ is an attraction between atoms that allows the formation of chemical substances that contain two or more atoms. The bond is caused by the electrostatic force of attraction between opposite charges - either between electrons and nuclei - or
Macromolecule
Radioactivity
Mass Spectrometry (MS) Procedure
Chemical Bond
34. A dispersion is a system in which particles are dispersed in a continuous phase of a different composition (or state). There are three main types of dispersions: Coarse dispersion (Suspension) Colloid Solution
Dispersion
Colloid
Electronegativity
Sigma Bond
35. The energy level of the electron is one of the things that make one state different from another. Each level - or state - has a specific energy for the electron and a specific set of probabilities for its showing up in various places.
Atomic Radius
Atomic Weight
Isotopes
Electron Energy Levels
36. Are covalent chemical bonds where two lobes of one involved atomic orbital overlap two lobes of the other involved atomic orbital. These orbitals share a nodal plane which passes through both of the involved nuclei.
Solution
molecular orbital (MO) theory
Pi Bonds
Hydrogen Bond
37. It focuses on how the atomic orbitals of the dissociated atoms combine to give individual chemical bonds when a molecule is formed.
valence bond (VB) theory
Dispersion
Mass Spectrometry (MS) Procedure
Mass Number/Atomic Mass Number
38. __ __-__ __ (_ _ _ _)are regression models used in the chemical and biological sciences and engineering. Like other regression models - _ _ _ _models relate measurements on a set of 'predictor' variables to the behavior of the response variable.
molecular orbital (MO) theory
Pi (p) electrons
Determination of atomic masses by chemical means
Quantitative structure-activity relationship models
39. John Dalton proposed that each chemical element is composed of atoms of a single - unique type - and though they cannot be altered or destroyed by chemical means - they can combine to form more complex structures (chemical compounds). This marked the
Solution
Evidence of Atomic Theory
Atomic Theory
Radioactive decay
40. Is a mathematical function that describes the wave-like behavior of either one electron or a pair of electrons in an atom. This function can be used to calculate the probability of finding any electron of an atom in any specific region around the ato
Valence shell electron pair repulsion (VSEPR) theory
Atomic Orbit
Macromolecule
molecular orbital (MO) theory
41. ___ ___ are molecules that have the same molecular formula - but have a different arrangement of the atoms in space. That excludes any different arrangements which are simply due to the molecule rotating as a whole - or rotating about particular bond
Structural Isomers
valence bond (VB) theory
Pi (p) bonds:
Dispersion
42. Describe values of conserved quantities in the dynamics of the quantum system. Perhaps the most peculiar aspect of quantum mechanics is the quantization of observable quantities - since quantum numbers are discrete sets of integers or half-integers.
hybridisation (or hybridization)
Quantum Numbers
Molecular Model
Evidence of Atomic Theory
43. The atomic number of hydrogen is 1; the atomic number of carbon is 6. The atomic number is also known as the proton number. It may be represented by the capital letter Z.
Isotopes Example
Nuclear Equations
Atomic Number Example
Atomic Spectrum
44. Unstable atomic nuclei will spontaneously decompose to form nuclei with a higher stability. The decomposition process is called ___. The energy and particles which are released during the decomposition process are called ___. When unstable nuclei dec
hybridisation (or hybridization)
Coordination Complex
Radioactivity
Chemical Bond
45. The mass of an atom of a chemical element expressed in atomic mass units (amu). It is approximately equivalent to the number of protons and neutrons in the atom (the mass number) or to the average number allowing for the relative abundances of differ
molecular orbital (MO) theory
Coarse Dispersion (Suspension)
Isotopes
Atomic Mass
46. A _____ is a very large molecule commonly created by polymerization of smaller subunits.
Macromolecule
Valence shell electron pair repulsion (VSEPR) theory
molecular orbital (MO)
Dispersion
47. Was developed to use the methods of quantum mechanics to explain chemical bonding.molecular orbital theory has orbitals that cover the whole molecule.
Hydrogen Bond
Mass Number/Atomic Mass Number
molecular orbital (MO) theory
hybridisation (or hybridization)
48. Bonds formed by the sideways overlap of p orbitals.
Macromolecule
Evidence of Atomic Theory
resonance or mesomerism
Pi (p) bonds:
49. ___ ____ constitutes the electrostatic attractive forces between the delocalized electrons - called conduction electrons - gathered in an electron cloud - and the positively charged metal ions.
Molecular Model
Chemical Bond
molecular orbital (MO) theory
Metallic Bond
50. Is an analytical technique that measures the mass-to-charge ratio of charged particles.[1] It is used for determining masses of particles - for determining the elemental composition of a sample or molecule - and for elucidating the chemical structure
Covalent Bond
Mass Spectrometry (MS)
Radioactivity
Valence shell electron pair repulsion (VSEPR) theory