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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. 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
molecular orbital (MO) theory
Determination of atomic masses by physical means
Atomic Orbit
Pi (p) electrons
2. 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.
Mass Number/Atomic Mass Number
Atomic Orbit
Radioactivity
Valence bond theory
3. 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
Isotopes
Pi Bonds
Colloid
Sigma Bond
4. An ___ is an atom or molecule in which the total number of electrons is not equal to the total number of protons - giving it a net positive or negative electrical charge.
Quantitative structure-activity relationship models
Ion
Chemical Bond
Atomic Number
5. ____ - symbol ? - is a chemical property that describes the tendency of an atom or a functional group to attract electrons (or electron density) towards itself.
Pi (p) electrons
Ionization Energy
Molecular Model
Electronegativity
6. 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.
Colloid
Radioactivity
Nuclear Equations
molecular orbital (MO)
7. 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
Structural Isomers
Dispersion
Quantitative structure-activity relationship models
8. 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
Colloid
Mass Number Example
Quantum Numbers
9. A chemical way to determine the atomic mass of an element is to combine the element with oxygen - determine the mass of the element and oxygen in the compound formed - and determine the number of atoms of oxygen combined per atom of the element.
Determination of atomic masses by chemical means
Colloid
Radioactivity
Atomic Theory
10. 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 ___ ___
Hydrogen Bond
Atomic Mass
Molecular Dipolar Moments
The Periodic Table
11. ____ is the relative tendency of a bonded atom to attract electrons to itself. An atom with extremely low ____ - is said to be electropositive since its tendency is to lose rather than to gain - or attract - electrons. ______ decreases down a Group i
Valence bond theory
Electronegativity
Sigma (s) bonds
Molecular Dipolar Moments
12. An explanation of the structure of matter in terms of different combinations of very small particles (atoms). is a theory of the nature of matter - which states that matter is composed of discrete units called atoms - as opposed to the obsolete notio
Atomic Theory
Ionic Bond
Atomic Number Example
Coarse Dispersion (Suspension)
13. __ __ 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.
Quantitative structure-activity relationship models
Determination of atomic masses by chemical means
Atomic Orbit
Nuclear Equations
14. 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
Determination of atomic masses by chemical means
resonance or mesomerism
Distinction between Periods and Groups
Mass Number Example
15. 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
Evidence of Atomic Theory
Atomic Spectrum
Atomic Number
The Periodic Table
16. 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
Pi (p) bonds:
Isotopes Example
Ionic Bond
Atomic Orbit
17. 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)
Pi (p) bonds:
Molecular Dipolar Moments
Electronegativity
18. 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
valence bond (VB) theory
Atomic Spectrum
Determination of atomic masses by physical means
19. Bonds formed by the head-on overlap of sp - sp2 - or sp3 hybrid orbitals with each other or with hydrogen 1s orbitals.
Electronegativity
Determination of atomic masses by physical means
Hydrogen Bond
Sigma (s) bonds
20. (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
Mass Spectrometry (MS) Procedure
molecular orbital (MO) theory
Pi (p) electrons
Isotopes Example
21. 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
molecular orbital (MO) theory
Coarse Dispersion (Suspension)
Atomic Weight
Atomic Spectrum
22. Bonds formed by the sideways overlap of p orbitals.
Pi Bonds
Hybridization
Isotopes Example
Pi (p) bonds:
23. 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
Evidence of Atomic Theory
Structural Isomers
Valence bond theory
Valence shell electron pair repulsion (VSEPR) theory
24. 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.
Pi Bonds
resonance or mesomerism
Colloid
Electronegativity
25. 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
Radioactive decay
Mass Spectrometry (MS)
Solution
Coordination Complex
26. For instance - there are two main isotopes of chlorine: chlorine-35 and chlorine-37. In any given sample of chlorine that has not been subject to mass separation there will be roughly 75% of chlorine atoms which are chlorine-35 and only 25% of chlori
Molecular Dipolar Moments
Chemical Bond
Distinction between Periods and Groups
Mass Number Example
27. 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
molecular orbital (MO) theory
Mass Number/Atomic Mass Number
Hybridization
Hydrogen Bond
28. 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.
Quantum Numbers
Atomic Number Example
Isotopes Example
Evidence of Atomic Theory
29. 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
valence bond (VB) theory
Sigma (s) bonds
Atomic Radius
Macromolecule
30. 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.
molecular orbital (MO) theory
Radioactivity
Ionization Energy
Electron Energy Levels
31. 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
Determination of atomic masses by physical means
resonance or mesomerism
Oxidation State
Pi (p) electrons
32. 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.
Electronegativity
Coarse Dispersion (Suspension)
Quantum Numbers
Mass Number Example
33. 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
Chemical Bond
Pi Bonds
Coarse Dispersion (Suspension)
Isotopes Example
34. Was developed to use the methods of quantum mechanics to explain chemical bonding.molecular orbital theory has orbitals that cover the whole molecule.
Atomic Number Example
Quantitative structure-activity relationship models
Atomic Orbit
molecular orbital (MO) theory
35. 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
Ionic Bond
Radioactive decay
Macromolecule
36. 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
Chemical Bond
Evidence of Atomic Theory
Colloid
molecular orbital (MO)
37. 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 -
Colloid
Sigma Bond
Atomic Number
Atomic Spectrum
38. 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
Atomic Orbit
Colloid
Isotopes
Atomic Mass
39. 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
Pi (p) bonds:
molecular orbital (MO) theory
Valence bond theory
Molecular Model
40. ___ ___ 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
Applications of Nuclear Chemisty
Structural Isomers
Atomic Theory
Atomic Number
41. 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
Mass Spectrometry (MS) Procedure
Covalent Bond
Radioactivity
Macromolecule
42. 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
Oxidation State
Radioactive decay
Ionization Energy
Hydrogen Bond
43. 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.
Solution
Mass Spectrometry (MS)
Atomic Weight
Covalent Bond
44. 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.
Applications of Nuclear Chemisty
Hybridization
Pi (p) bonds:
Coordination Complex
45. 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:
Mass Spectrometry (MS)
Atomic Number
Atomic Number Example
Distinction between Periods and Groups
46. 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
Oxidation State
Coordination Complex
Dispersion
Ionic Bond
47. A _____ is a very large molecule commonly created by polymerization of smaller subunits.
Atomic Orbit
Pi Bonds
Macromolecule
Isotopes Example
48. Electrons in a (p) orbital (either bonding or nonbonding).
Ion
Dispersion
Pi (p) electrons
Ionization Energy
49. Model for predicting molecular geometry. Based on the idea that - in a molecule - electron pairs arrange themselves as far apart as possible to minimize electron-electron repulsion. The shape of a molecule is determined by the number of electron pair
Isotopes Example
Valence shell electron pair repulsion (VSEPR) theory
Coordination Complex
Atomic Number
50. __ __-__ __ (_ _ _ _)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.
Atomic Theory
Metallic Bond
Atomic Number
Quantitative structure-activity relationship models