CHE 1004 Final Review
Which is a physical change? A.A rubber band is stretched B.A piece of wood is burned C.A firecracker explodes D.A nail rusts
A.A rubber band is stretched
A sample of an unknown substance was tested in a lab. The sample could not be decomposed by chemical or physical means. Based on these results the lab reported that the sample was most likely a(n) A.Element B.Solution C.Mixture D.Compound
A.Element
Which is a transition metal? A.Manganese B.Magnesium C.Silicon D.Potassium
A.Manganese
Which element is a liquid at room temperature? A.Mercury B.Nickel C.Iodine D.Water
A.Mercury
Which represents an element? A.N2 B.OS C.NI D.CO
A.N2
Physical properties include all of the following EXCEPT A.Reactivity w/ other substances B.Odor C.Specific gravity D.Boiling point
A.Reactivity w/ other substances
Which would you classify as a semiconductor? A.Silicon B.Copper C.Diamond D.Lead
A.Silicon
Which of the following statements is NOT correct? A.Ionic compounds consist of charged particles bonded together in a crystal lattice B.ALL covalent bonds are formed by sharing ONLY one pair of electrons C.The covalent bonds between two carbon atoms will be nonpolar D.Two atoms w/ different electronegativities that form a polar covalent bond will have partial ionic changes E.An electronegativity of 2.1 indicates you have an ionic bond.
B
Which of these statements regarding a neutral ionic compound is NOT true? A.All charges in the compound must add to 0 B.The negative ion is always written before the positive ion C.Ionic compounds must always contain metals and nonmetals D.All ionic compounds include at least two elements
B
Which phase releases energy? A.H2O (s) --> H2O (g) B.H2O (l) --> H2O (s) C.H2O (l) --> H2O (g) D.H2O (s) --> H2O (l)
B
Which solution containing an equal number of moles of each of the substances is a buffer? A.HNO2 and HNO3 B.CH3COOH and NaCH3COO C.H2CO3 and CO3 D.HCl and NaOH
B
Which species is a conjugate base of HCO3? A.H2O B.CO3 C.H2CO3 D.CO2
B
Dalton's law
P(total)= P(gas1) + P(gas2) + P(gas n)
One would expect Y to be A.Brittle B.A nonconductor of electricity C.Dull in appearance D.Ductile
D
The atomic number of an element is related to its A.atomic mass B.number of neutrons in the nucleus C.mass number D.number of protons in the nucleus
D
The reaction of LiOH and HCl produces A.LiClO and LiH B.LiOH and HCl C.LiH and HClO D.HOH and LiCl
D
When solutions of an acid and a base are reacted, the products are A.A metal oxide and water B.A new acid and a new base C.A nonmetal oxide and water D.A salt and water
D
Which bond is the most polar? A.C-N B.C-O C.C-C D.C-F E.C-Cl
D
Which compound is a weak acid? A.HBr B.H2SO4 C.HNO3 D.CH3COOH
D
Which compound or element has the highest boiling point? A.CO2 B.Cl2 C.LiF D.KI
D
Which element is liquid at room temperature? A.Chlorine B.Iodine C.Fluorine D.Bromine
D
Which is a chemical change? A.Ice melts B.Water evaporates C.Rock is ground into sand D.A penny tarnishes
D
Which of the following is ALWAYS necessary for a chemical reaction to occur between two reactants, A and B? A.equal amounts of A and B must be present B.A and B must be present in the same physical state C.the reaction must be carried out at a temperature higher than room temperature D.A and B must collide with the proper orientation and with a certain minimum amount of energy
D
Which of the following is a FALSE statement? A.The Lewis dot symbol for 84PO is B.A phosphate ion, PO-3, is a polyatomic ion C.Oxygen has a greater electronegativity than carbon D.A bromide ion is smaller than a bromine atom E.The ionic bond is the electrostatic attraction existing between oppositely charged ions
D
Which of the following is always necessary for a chemical reaction to occur between two reactants, A and B? A.equal amounts of A and B must be present B.A and B must be present in the same physical state C.the reaction must be carried out at a temperature higher than room temperature D.A and B must collide with the proper orientation and with certain minimum amount of energy
D
Which species is the conjugate acid of HCO3? A.H2O B.CO2 C.CO3 D.H2CO3
D
A balanced chemical equation tells the number of ______ of each reactant that combine and the number of ______ of each product formed
moles; moles
How many atoms of silicon (radii is 111 pm) will fit into a cube that measures 6.0 inches by 6.0 inches by 6.0 inches?
1.6*10^7
All atoms are electrically A.neutral B.positive C.negative D.positive or negative depending on the atom
A
An equilibrium constant with a value of 8.0*10^6 indicates that at equilibrium A.the products are favored B.approximately equal concentrations of reactants and products are present C.there are more reactants present than products D.the reactants are favored
A
An equilibrium constant with a value of 8.0*10^6 indicates that at equilibrium A.the products are favored B.approximately equal concentrations of reactants and products are present C.there are more reactants present than products D.the reactants are favored
A
Breaking a chemical bond requires energy. A.true B.fasle
A
Which is a compound? A.Water B.Iron C.Lead D.Air
A
Which is an alkaline earth metal? A.Magnesium B. Iodine C.Hydrogen D.Manganese
A
Which of the following statements is TRUE? A.All the isotopes of an element have the same number of electrons B.The atomic number of an element is always greater than its mass number C.All isotopes of the same element have the same number of neutrons D.35/18 Cl and 37/17 Cl are isotopes of chlorine E.The ratio of protons to neutrons within an atom is always 1:1
A
Which species is a diprotic acid? A.H2CO3 B.H2 C.Mg(OH)2 D.CH3COOH
A
Which term correctly describes a reaction in which the energy of the products is lower than the energy of the reactants? A.exothermic B.combustion C.endothermic D.oxidation-reduction
A
Which phase change absorbs energy? A.CH3OH (l) --> CH3OH (g) B.HOH (g) --> HOH (l) C.HOH (l) --> HOH (s) D.Fe (l) --> Fe (s)
A. CH#OH (l) --> CH#OH (g)
A reversible reaction has reached equilibrium when which condition is established? A.all of the reactants have been converted into products B.the forward and reverse reactions become equal C.the concentrations of reactants and products become equal D.the reverse reaction begins to occur
B
A reversible reaction has reached equilibrium when which condition is established? A.all of the reactants have been converted into products B.the forward reaction and reverse reaction rates become equal C.the concentrations of reactants and products become equal D.the reverse reaction begins to occur
B
Breaking a chemical bond always releases energy. A.True B.False
B
STP is defined as a pressure of exactly one atmosphere and a temperature of 25 Celsius. A. true B. false
B
STP is defined as a pressure of exactly one atmosphere and a temperature of 25 degrees Celsius. A.True B. False
B
The chemical reactivity of an element is determined by which of the following? A.The number of protons in an atom of the element B.The number of valence electrons in an atom of the element C.The number of neutrons in an atom of the element D.The number of protons and neutrons in an atom of the element
B
Which element forms a diatomic molecule? A.Calcium B.Chlorine C.Neon D.Sulfur
B
Which elements react with the halogens forming compounds containing a ratio of 1 halogen atom to 2 atoms of the other element? A.alkali metals B.alkaline earth metals C.metalloids D.noble gases
B
Which experiment led to the notion that the atom contains an extremely small, positively charged nucleus? A.Millikan's oil drop experiment B.Rutherford's scattering experiment C.Thomson's cathode ray tube experiment D.Dalton's atomic theory
B
Which is not a physical property of water? A.The freezing point of water is 0 Celsius B.Water reacts with sodium metal to produce sodium hydroxide and hydrogen C.The density of water at 4 Celsius is 1.00g/mL D.Water is colorless
B
Which is a pure substance existing as different phases in a heterogeneous system? A.Cork floating in water B.Ice floating in water C.Flour suspended in water D.Salt dissolved in water
B.Ice floating in water
How many atoms of hydrogen are present in one molecule Al(H2PO4)3? A.2 B.3 C.5 D.6
D
Ammonia, NH3, is an example of a A.weak acid B.strong acid C.weak base D.strong base
C
Consider the following reversible reaction at equilibrium: N2 + O2 <--> 2NO. What is the effect of removing some N2 from the equilibrium system? A.the equilibrium shifts to the right B.the concentration of NO increases C.the concentration of O2 increases D.the concentration of O2 decreases
C
Consider the reversible reaction N2 + O2 <---> 2NO. What is the effect of removing some N2 from the equilibrium system? A.the equilibrium system shifts to the right B.the concentration on NO2 increases C.the concentration of O2 increases D.the concentration of O2 decreases
C
The law of conservation of mass states that A.molecules cannot be created or destroyed in a chemical reaction B.heat cannot be created or destroyed in a chemical reaction C.atoms cannot be created or destroyed in a chemical reaction D.compounds cannot be created or destroyed in a chemical reaction
C
The number of electrons in a single f orbital can hold is A.10 B.6 C.2 D.14
C
Which element has it's valence electrons farthest from the nucleus? A.Li B.Mg C.Cs D.S
C
Which species can act as a Bronsted- Lowry acid? A.Br2 B.LiOH C.HBr D.CO3
C
Which species can act as a Bronsted-Lowry acid? A.Br2 B.LiOH C.HBr D.CO3
C
Which species is a Bronsted-Lowry base? A.HBr B.Br2 C.LiOH D.CO3
C
Which term correctly describes a reaction in which energy of the products is higher than the energy of the reactants? A.combustion B.oxidation-reduction C.endothermic D.exothermic
C
Which term correctly describes a reaction in which the energy of the products is higher than the energy of the reactants? A.combustion B.oxidation-reduction C.endothermic D.exothermic
C
A temperature of 100 K is equal to which Celsius temperature? A. 273 B.237 C.-173 D.-137
C.-173
How many significant digits are in the number 1.30x 10^4? A.1 B.2 C.3 D.4
C.3
What is the total number of atoms present in the compound CH3COOH? A.1 B.2 C.3 D.4
C.3
The elements on the periodic table are placed in order of increasing A.Boiling point B.Atomic mass C.Atomic number D.Density
C.Atomic number
Which element forms diatomic molecules? A.Nickel B.Iron C.Nitrogen D.Boron
C.Nitrogen
Which assumption is NOT part of the kinetic molecular theory of gases? A.when gas particles collide with each other, they rebound and travel in new directions B.a gas consists of particles that move around randomly and rapidly C.the size of gas particles is small compared to the space between the particles D.because the space between gas particles is large, gas particles exert no attractive forces on each other E.the kinetic energy of gas particles does not change with increasing temperature
E
Which assumption is not part of the kinetic-molecular theory? A.when gas particles collide with each other, they rebound and travel in new directions B.a gas consists of particles that move randomly and rapidly C.the size of gas particles is small compared to the space between the particles D.b/c the space between the gas particles is large, gas particles exert no attractive forces on each other E.the kinetic energy of gas particles does not change with increasing temperature
E
Give your answer with the correct significant figures 4.561*[(1986-1875)/(5.560+0.0007)] A.7.520*10^3 B.91.06 C.91 D.7.52*10^3 E.91.1 F.7.5*10^3
E.91.1
Ideal gas law
PV=nRT
Breaking a chemical bond requires energy
True
The formula weight of a compound is the sum of the atomic weights of all the atoms in a compound, reported in atomic mass units
True
What happens when a nonmetal oxide reacts with water?
an acid
