Chemistry 1300 Final Test
Terms
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- The science of the composition, structure, properties, and reactions of matter, especially of atomic and molecular systems.
- Chemistry
- The science dealing with the composition of matter and the changes in composition that matter undergoes.
- Chemistry
- Chagnes that involve the rearrangement of the position of particles within the solid
- Memory
-
1) Collect the facts or data that are relevent to the problem or question at hand
2) Formulate a hypothesis that will account for the data and that can be tested by further experimentation
3) Plan and do additional experiments to test the hypot - Scientific Method
- A tentative explanation of certain facts that provides a basis for further experimentation
- Hypothesis
- A well-established hypothesis is often called a __________ or model, An explanation of the general principles of certain phenomena with considerable evidence or facts to support it
- Theory
- Simple statements of natural phenomena to which no exceptions are known under the given conditions
- Scientific laws
- The quantity or amount of matter that an object possesses
- Mass
- A measure of the earth's gravitational attraction for a body
- Weight
- The number of digits that are known plus one estimated digit are considered significant in a measured quantity; also called significant digits
- Significant figures
- The process by which the value of the last digit retained is determined after dropping nonsignificant digits
- Rounding off numbers
- Writing a number as a power of 10; to do this, move the decimal point in the original numbers so that it is located after the first nonzero digit, and follow the new number by a multiplication sign and 10 with an exponent (called its power) that is the n
- Scientific notation
- A decimal system of measurements; An agreed-upn standard system of measurements used by scientists around the world
- Metric system or SI
- The standard unit of length in the SI and metric systems; equals 39.37 inches
- Meter
- The standard unit of mass in the metric system; equals 2.205 lbs.
- Kilogram
- The amount of space occupied by matter; measured in SI units by cubic meters, but also commonly in liters and milliliters
- Volume
- A unit of volume commonly used in chemistry; =1000 mL
- Liter
- A form of energy associated with the motion of small particles of matter
- Heat
- A measure of the intensity of heat, or of how hot or cold a system is; SI unit is the kelvin
- Temperature
- The mass of an object divided by its volume
- Density
- The ratio of the density of one substance to the density of another substance taken as a standard. Water is usually the standard for liquids and solids; air, for gass
- Specific gravity
- Anything that has mass and occupies space
- Matter
- Has a definite shape and volume, with particles that coere rigidly to one another, can be independent of its container
- Solid
- Without shape or form
- Amorphous
- Has a definite volume, but not a definite shape, with particles that cohere firmly, but not rigidly, able to move freely
- Liquid
- Has indefinite volume and no fixed shape, with particles that move indeendently of one anothers
- Gas
- A particular kind of matter with a definite, fixed composition
- Substance
- Uniform in appearance and has the same properties throughout
- Homogeneous
- Matter consisting of two or more physically distinct phases
- Heterogeneous
- A homogeneous part of a system separated from other parts by physical boundaries
- Phase
- Simply the body of matter under consideration
- System
- A material containing two or more substances and can be either heterogeneous or homogeneous, variable in composition
- Mixture
- A fundamental or elementary substance that cannot be broken down by chemical means to simpler substances
- Element
- Smallest particle of an element
- Atom
- Abbreviation of an element, Ba I N O Ag
- Symbol
- Solids at room temperature, have high luster, are good conductors of heat and electricity, are malleable, and are ductile, have a high melting point and high density
- Metals
- Are not lustrous, have relatively low melting points and densities, and are generally poor conductors of heat and electricity, Combine with one another
- Nonmetals
- An element having properties that are intermediate between those of metals and nonmetals (ex. Silicon); these elements are useful in electronics
- Metalloids
- A distinct substance that contains two or more elements chemically combined in definite proportion by mass
- Compound
- The smallest uncharged individual unit of ompund formed by the union of two or more atoms
- Molecule
- A positively or negatively charged atom or group of atoms
- Ion
- Positively charged ions
- Cation
- Negatively charged ion
- Anion
- The molecules of elements that always contain two atoms. Seven elements occur: H2, N2, O2, F2, Cl2, Br2, and I2
- Diatomic molecules
- Used as abbreviations for compounds, shows the symbols and the ratio of the atoms of the elements in a compound
- Chemical formula
- Numbers that appear partially below the line and to the right of a symbol of an element
- Subscripts
- The characteristics, or traits, of substances that give them their unique identities, classified as physical or chemical
- Properties
- The inherent characteristics of a substance that can be determined without altering its composition; they are associated with its physical existance
- Physical properties
- Describe the ability of a substance to form new substances, either by reaction with other substances or by decomposition
- Chemical properties
- Changes in physical properties (such as size, shape, and density) or changes in the state of matter without an accompanying change in composition
- Physical changes
- New substances are formed that have different properties and composition from the original material. The new substances need not resemble the initial material in any way.
- Chemical change
- A shorthand expression showing the composition and the products of a chemical change (for example, 2H20= 2H2 + 02)
- Chemical equations
- The starting substances (water, copper, and oxygen)
- Reactants
- The substance produced (hydrogen, oxygen, and copper (II) oxide)
- Products
- States that no change is observed in the total mass of the substances involved in a chemical change
- Law of Conservation of Mass
- The capacity of matter to do work
- Energy
- Stored energy; or energy that an object possesses due to its relative position.
- Potential energy (PE)
- Energy that matter possesses due to its motion.
- Kinetic energy (KE)
- The SI unit of energy, see also calorie
- Joules
- A commonly used unit of heat energy; 1 calorie is a quantity of heat energy that will raise the temperature of 1 g of water 1° C
- Calorie
- The quantity of heat (lost or gained) required to cahnge the temperature of 1 g of that substance by 1° C
- Specific heat
- Energy can be neither created nor destroyed, though it can be transformed from one form to another
- Law of Conservation of Energy
- The first modern atomic theory to state that elements are composed of minute individual particles called atoms
- Dalton's atomic model
- A compound always contains two or more elements combined in a definite proportion by mass
- Law of Definite composition
- Atoms of two or more elements may combine in different ratios to produce more than one compound
- Law of Multiple proportions
- Electrons, protons, and neutrons
- Subatomic particles
- A particle with a negative electrical charge and a mass of 9.110 x 10 -28 g
- Electron (e-)
- A particle with a relative mass of 1 amu and an actual mass of 1.673 x 10 -24 g. Has relative charge (+1)
- Proton
- The electrons are negatively charged particles embedded in the atomic sphere, atoms are electrically neutral, sphere contains equal number of protons, or positive charges
- Thomson model of the atom
- Has neither a positive nor a negative charge and has a relatvie mass of about 1 amu. Slightly greater mass than proton
- Neutron
- The central part of an atom that contains all its protons and neutrons. Very dense and has a positive electrical charge
- Nucleus
- The number of protons in the nucleus of an atom of that element
- Atomic Number
- Atoms of an element having the same atomic number but different atomic masses
- Isotopes
- A unit of mass equal to one-twelth the mass of a carbon-12 atom.
- Atomic Mass Unit
- The average relative mass of the isotopes of that element compared to the atomic mass of carbon-12 ( exactly 12.0000... amu)
- Atomic Mass
- The system of names that chemists use to identify compounds
- Chemical nomenclature
- Compounds that do not generally contain carbon
- Inorganic compounds
- Two atoms bonded together to make a molecule, Seven of the elements
- Diatomic molecules
- Hydrogen, Oxygen, Nitrogen, Chlorine, Fluorine, Bromine, Iodine
- 2
- Sulfur
- 8
- Phosphorus
- 4
- A charged particle can be produced by adding or removing one or more electrons from a neutral atom
- Ion
- Any neutral atom that loses an electron will form a(n) _______
- Cation
- Any neutral atom that gains an electron will form a(n) _________
- Anion
- To name an anion consisting of only one element, use the stem of the parent element name and change the ending to ________
- -ide
- Most often ions are formed when metals combine with ____________
- Nonmetals
- Compound that contains only two different elements
- Binary compound
- The cation is written first in the formula, followed by the ___________
- anion
-
1) Cu 1+, copper (I)
2) Cu 2+, copper (II)
3) Hg 1+ (Hg2)2+, Mercury (I)
4) HG 2+, Mercury (II) -
1) Cuprous
2) Cupric
3) Mercurous
4) Mercuric -
1) Fe 2+, Iron (II)
2) Fe 3+, Iron (III)
3) Sn 2+, Tin (II)
4) Sn 4+, Tin (IV)
5) Pb 2+, Lead (II) -
1) Ferrous
2) Ferric
3) Stannous
4) Stannic
5) Plumbous -
1) Pb 4+, Lead (IV)
2) As 3+, Arsenic (III)
3) As 5+, Arsenic (V)
4) Ti 3+, Titanium (III)
5) Ti 4+, Titanium (IV) -
1) Plumbic
2) Arsenous
3) Arsenic
4) Titanous
5) Titanic - Symbols written and occur first in a series when a compound is formed between two nonmetals
- Si, B, P, H, C, S, I, Dr, N, Cl, O, F
-
1) Nona
2) Hepta
3) Tetra
4) Mono -
1) 9
2) 7
3) 4
5) 1 -
1) Deca
2) Octa
3) Hexa
4) Penta
5) Tri
6) Di -
1) 10
2) 8
3) 6
4) 5
5) 3
6) 2 - Sâ‚‚Fâ‚â‚€
- disulfur decafluoride
- CClâ‚„
- carbon tetrachlorid
- Nâ‚‚Oâ‚…
- dinitrogen pentaoxide
- Composed of hyrdrogen and one other nonmetallic element
- Binary acids
-
Binary Acids
1) HF
2) HCl
3) Hâ‚‚S -
1) Hydrofluoric acid
2) Hydrochloric acid
3) Hydrosulfuric acid -
1) HBr
2) HI
3) Hâ‚‚Se -
1) Hydrobromic acid
2) Hydroiodic acid
3) Hydroselenic acid -
1) Write the prefix hydro- followed by the stem of the second element and add the suffix ic
2) Write the word acid - Naming binary acids
- An ion that contains two or more elements
- Polyatomic ion
-
1) Acetate
2) Ammonium
3) Arsenate
4) Hydrogen carbonate
5) Hydrogen sulfate
6) Bromate
7) Carbonate
8) Chlorate
9) Chromate -
1) Câ‚‚H₃Oâ‚‚â»
2) NHâ‚„âº
3) AsOâ‚„ 3-
4) HCO₃â»
5) HSOâ‚„â»
6) BrO₃â»
7) CO₃ 2-
8) ClO₃â»
9) CrOâ‚„ 2- -
1) Cyanide
2) Dichromate
3) Hydroxide
4) Nitrate
5) Nitrite
6) Permangante
7) Phosphate
8) Sulfate
9) Sulfite -
1) CNâ»
2) Cr₂O₇ 2-
3) OHâ»
4) NO₃â»
5) NOâ‚‚â»
6) MnOâ‚„â»
7) POâ‚„ 3-
8) SOâ‚„ 2-
9) SO₃ 2- - A system that uses Roman numerals to name elements that form more than one type of cation
- Stock System
-
1) Hypochlorite
2) Chlorite
3) Chlorate
4) Perchlorate -
1) ClOâ»
2) ClOâ‚‚â»
3) ClO₃â»
4) ClOâ‚„â» -
1) Hypochlorous acid
2) Chlorous acid
3) Chloric acid
4) Perchloric acid -
1) HClO
2) HClOâ‚‚
3) HClO₃
4) HClOâ‚„ -
1) Sulfate ion
2) Sulfite ion
3) Nitrate ion
4) Nitrite ion
5) Carbonate ion
6) Borate ion -
1) SOâ‚„ 2-
2) SO₃ 2-
3) NO₃â»
4) NOâ‚‚â»
5) CO₃ 2-
6) BO₃ 3- -
1) Phosphate ion
2) Phosphite ion
3) Iodate ion
4) Acetate ion
5) Oxalate ion
6) Bromate ion -
1) POâ‚„ 3-
2) PO₃ 3-
3) IO₃â»
4) Câ‚‚H₃Oâ‚‚â»
5) Câ‚‚Oâ‚„ 2-
6) BrO₃⻠- 1 mol, 6.022 x 10^23
- Avagadro's Number
- 6.022 x 10^23 items=
- 1 mole
-
The mass of avogadro's number of atoms or molecules
H- 1.008 amu- 1.008 g- 6.022 x 10^23 - Molar Mass
- The mass percent represented by each element in a compound
- Percent composition of a compound
- Gives the smallest whole-number ratio of atoms present in a compound, gives the relative numbe of atoms of each element in the compound
- Empirical formula
- The true formula, representing the toal number of atoms of each element present in one molecule of a compound
- Molecular formula
- The substances entering the reaction are called
- the reactants
- The substances formed are called
- the products
- A shorthand expression for a chemical change or reaction, uses the chemical symbols and formulas of the reactants and products and other symbolic terms to represent a chemical reaction
- Chemical equation
- Contains the same number of each kind of atom on each side of the eqaution, obeys the law of conservation of mass
- Balanced equation
- Two reactants combine to give one product, A + B ---- AB
- Combination reaction
-
One element reacts with a compound to replace one of the elements of that compound, yeilding a different element and a different compound
A + BC ---- B + AC or
A + BC ---- C + BA - Single-displacement reaction
-
A single substance is decomposed, or broken down, to give two or more different substances. This reaction may be considered the reverse of combination
AB --- A + B - Decomposition reaction
-
Two compounds exchange partners with each other to produce two different compounds
AB + CD ---- AD + CB - Double-displacement reaction
- Liberate heat
- Exothermic reactions
- Absorb heat
- Endothermic reactions
- The quantity of heat produced by a reaction is known as
- Heat of reaction
- Compounds containing only hydrogen and carbon
- Hydrocarbons
- The amount of energy that must be supplied to start a chemical reaction is called the
- Activation energy
- The sum of the atomic masses of all the atoms in an element or compound, applies to the mass of a mole of any formula unit- atoms, molecules, or ions; it is the atomic mass of an atom, or the sum of the atomic masses in a molecule or an ion (in grams)
- Molar mass
- The smallest unit of a molecular substance and a mole is Avogadro's number of molecules of that substance
- Relationship between molecule and mole
- The area of chemistry that deals with quantitative relationships among reactants and products is known as
- Stoichiometry
- A ratio between the number of moles of any two species involved in a chemical reaction
- Mole ratio
- It limits the amount of product that can be formed
- Limiting reactant
- The calculated amount of product that can be obtained from a given amount of reactant, according to the chemical equation
- Theoretical yield
- The amount of product that we finally obtain
- Actual yield
- The ratio of the actual yield to the theoretical yield multiplied by 100
- Percent yeild
- The distance between consecutive peaks (or troughs) in a wave
- Wavelength
- Tells how many waves pass a particular point per second
- Frequency
- Tells how fast a wave moves through space
- Speed
- A beam of light behaves like a stream of timy packets of energy called
- Photons
- Colored lines generated when light emitted by a gas is passed through a spectroscope.
- Line spectrum
- Energy is never emitted in a continuous stream buy only in small discrete packets called
- Quanta
- Number of energy levels are available, the lowest of which is called the ______ _______
- Ground state
- A cloudlike region around the nucleus where electrons are located. Considered to be energy sublevels (s,p,d,f) within the principal energy levels
- Orbitals
- Existing within the atom, these energy levels contain orbitals within which electrons are found
- Principal energy levels of electrons
- Each principal energy level is divided into
- Sublevels
- A property of an electron that describes its appearance of spinning on an axis like a globe
- Spin
- An atomic orbital can hold a maximum of two electrons, which must have opposite spins
- Pauli exclusion principle
- The orbital arrangement of electrons in an atom
- Electron configuration
- An electron in the outermost energy level of an atom; these electrons are the ones involved in bonding atoms together to form compounds
- Valence electrons
- Each horizontal row in the periodic table is called a
- Period
- Elements that behave in a similar manner are found in, form the vertical columns on the periodic table
- Groups or Families
- The A groups are known as the
- Representative elements
- The B groups and Group VIII are called
- Transition elements
- An atom is the energy required to remove an electron from the atom
- Ionization energy
- An atom is a representation that shows the valence electrons for that atom
- Lewis structure
- The attraction between oppositely charged ions
- Ionic bond
- Consists of a pair of electrons shared between two atoms
- Covalent bond
- A covalent bond between two atoms with differeing electronegativity values, resulting in unequal sharing of bonding electrons
- Polar covalent bond
- The relative attraction that an atom has for a pair of shared electrons in a covalent bond
- Electronegativity
- If the electronegativities are the same, the bond is ________ ________ and the electrons are shared equally
- Nonpolar covalent
- A molecule that is electrically asymmetrical, causing it to be oppositely charged at two points
- Dipole
- When only two pairs of electrons surround a central atom, they should be placed 180 degrees apart to give a _______________
- Linear structure
- When three pairs of electrons surround an atom, they should be placed 120 degrees apart to show the ____________________
- trigonal planar structure
- Wehn four pairs of electrons surround a central atom, they should be placed 109.5 degrees apart to give them a ____________________
- tetrahedral structure
- A group of assumptions used to explain the behavior and properties of gases
- Kinetic-molecular theory (KMT)
- A gas that behaves exactly as outlined by the theory is known as
- Ideal Gas
- 1/2mv^2
- KE (Kinetic Energy)
- The ability of two or more gases to mix spontaneously until they form a uniform mixture
- Diffusion
- A process by which gas molecules pass through a very small orifice (opening) from a container at higher pressure to one at lower pressure
- Effusion
- The reates of effusion of two gases at the same temperature and pressure are inversely proportional to the square roots of their densities, or molar masses
- Graham's law of effusion
- Defined as forcer per unit area
- Pressure
- The pressure experienced by objects on Earth as a result of the layer of air surrounding our planet.
- Atmospheric Pressure (ATM)
- A device used to measure atmospheric pressure
- Barometer
- The standard atmospheric pressure, the pressure exerted by a column of mercury 760 mm high at a temperature of 0 C
- 1 atmosphere (atm)
-
At constant temperature (T) the volume (V) of a fixed mass of gas is inversely proportional to the pressure (P), which may be expressed as:
Pâ‚Vâ‚ = Pâ‚‚Vâ‚‚ - Boyle's law
- -273 Degrees C; this temperature is the zero point on the Kelvin (absolute) temperature scale--the temperature at which the volume of an ideal, or perfect, gas would become zero
- Absolute Zero
-
At constant pressure the volume of a fixed mass of any gas is directly proportional to the absolute temperature, which may be expressed as:
Vâ‚/Tâ‚ = Vâ‚‚/Tâ‚‚ - Charle's Law
-
The pressure of a fixed mass of a gas, at constant volume, is directly proportional to the Kelvin temperature:
Pâ‚/Tâ‚ = Pâ‚‚/Tâ‚‚ - Gay-Lussac's Law
- 0 degress Celcius (273 K) and 1 atm (760 torr)
-
Standard Conditions
Standard Temperature and Pressure (STP) - The total pressure of a mixture of gases is the sum of the partial pressures exerted by each of the gases in the mixture
- Dalton's law of partial pressures
- The pressure exerted independently by each gas in a mixture of gases
- Partial pressure
- Whem measured at the same temperature and pressure, the ratios of the volumes of reacting gases are small whole numbers
- Gay-Lussac's law of combining volumes
- Equal volumes of different gases at the same temperature and pressure contain the same number of molecules
- Avagadro's law
- he volume of 1 mol of a gas at STP equals 22.4 L/mol
- Molar volume (of a gas)
- Mass/Volume or g/L
- Density
- PV = nRT
- Ideal Gas Equation
- A substance existing in two or more molecular or crystalline forms (example: graphite and diamond are two ______ forms of carbon)
- Allotrope
- The escape of molecules from the liquid state to the gas or vapor state
-
Evaporation
Vaporization - Solid -------> Vapor
- Sublimination
- The process by which molecules in the gaseous state return to the liquid state
- Condensation
- The pressure exerted by a vapor in equilibrium with its liquid is known as the _____ _______
- Vapor pressure
- A substance that evaporates readily; a liquid with a high vapor pressure and a low boiling point
- Volatile
- The resistance of a liquid to an increase in its surface area is called
- Surface tension
- The spontaneous rising of a liquid in a narrow tube, which results from the cohesive forces within the liquid and the adhesive forces between the liquid and the walls of the container
- Capillary action
- The temperature at which the vapor pressure of a liquid is equal to the external pressure above the liquid
- Boiling point
- The temperature at which the vapor pressure of a liquid equals 1 atm or 760 torr pressure
- Normal boiling point
- A graph generated by plotting the temperature of a liquid on the x-axis and its vapor pressure on the y-axis.
- Vapor-pressure curve
- The temperature at which the solid and liquid states of a substance are in equilibrium
- Freezing or Meling point
- The energy required to change exactly one gram of a solid at its melting point into a liquid is called
- Heat of Fusion
- The energy required to change exactly one gram of liquid to vapor at its normal boiling point
- Heat of Vaporization
- Water is a highly polar molecule. It therefore does not have a ______ ________
- Linear structure
- The intermolecular force acting between molecules that contain hydrogen covalently bonded to the highly electronegative elements, F, O, and N
- Hydrogen bond
- Solids that contain water molecules as part of their crystallin structure are known as
- Hydrates
- Water in a hydrate is known as
-
Water of hydration
Water of crystallization - "without water"
- Anhydrous
- A system in which one or more substances are homogeneously mixed or dissolved in another substance
- Solution
- The substance that is dissolved--or the lest abundant component--in a solution
- Solute
- The dissolving agent or the most abundant component in a solution
- Solvent
- Describes the amount of one substance (solute) that will dissolve in a specified amount of another substance (solvent) under stated conditions
- Solubility
- Liquids that are capable of mixing and forming a solution
- Miscibile
- Those that do not form solutions or are generally insoluble in each other
- Immiscible
- The quantitative expression of the amount of dissolved solute in a particular quantity of solvent is known
- Concentration of a solution
- A solution containing dissolved solute in equilibrium with undissolved solute
- Saturated solution
- A solution containing less solute per unit volume than its corresponding saturated solution
- Unsaturated solution
- A solution containing more solute than needed for a saturated solution at a particular temperature
- Supersaturated solution
- Describes a solution that contains a relatively small amount of dissolved solute
- Dilute solution
- Contains a relatively large amount of dissolved solute
- Concentrated solution
- g solute/g solute + g solvent X 1,000,000 =
- Parts per million (ppm)
- g solute/ g solute + g solvent X 100 =
- Mass percent
-
number of moles of solute
_________________________ =
liter of solution - Molarity (M)
- Properties that depend only on the number of solute particles in a solution and not on the nature of those particles
- Colligative properties
- A membrane that allows the passage of water (solvent) molecules through it in either direction but prevents the passage of larger solute molecules or ions
- Semipermeable membrane
- The diffusion of water, either from a dilute solution or from pure water, through a semipermeable membrane into a solution of higer concentration
- Osmosis
- A solution contains an excess of H⁺ ions
- Arrhenius acid
- A solution contains an excess of OH⁻ ions
- Arrhenis base
- A acid is a proton (H⁺) donor
- Bronsted-Lowry acid
- A base is a proton (H⁺) acceptor
- Bronsted-Lowry base
- The result of a protein combining with a polar water molecule to form a hydrated hydrogen ion, H₃Oâº
- Hydronium ion
- An electron-pair acceptor
- Lewis acid
- An electron-pair donor
- Lewis base
- A substance having properties of both an acid and a base
- Amphoteric
- Substances whose aqueous solutions are conductors of electricity are called
- Electrolytes
- Substances whose solutions are nonconductors are known as
- Nonelectrolytes
- The process by which the ions of a salt separate as the salt dissolves
- Dissociation
- Acids, bases, and salts are __________
- electrolytes
- The formation of ions; it occurs as a result of a chemical reaction of certain substances with water
- Ionization
- Are essentially 100% ionized in solution
- Strong electrolytes
- Are much less ionized (based on comparing 0.1 M solutions)
- Weak electrolytes
- -log[H⁺] =
- pH
- pH < 7.00
- Acidic solution
- pH = 7.00
- Neutral solution
- pH > 7.00
- Basic solution
- The power to which 10 must be raised to give that number
- Logarithm
- The negative logarithm of the H⺠or H₃O⺠concentration in moles per liter
- pH
- The reaction of an acid and a base to form a salt and water
- Neutralization
- An ion in solution that does not undergo chemical change during a chemical reaction
- Spectator ions
- The process of measuring the volume of one reagent required to react with a measured mass or volume of another reagent
- Titration
- Compounds are written in their molecular, or formula expressions
- Un-ionized equation
- Compounds are written to show the form in which they are predominantly present; strong electrolytes as ions in solution; and nonelectrolytes, weak electrolytes, precipitates, and gases in their molecular (or un-ionized ) forms
- Total ionic equation