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Which of the following elements has an atomic number of 4?
A) Be
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Which of the following elements has only 12 protons?
C) Mg
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What is the atomic symbol for silver?
C) Ag
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Nonmetals are located where on the periodic table?
A) right side
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Group 1A elements are also called:
B) alkali metals.
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Group 7A elements are also called:
B) halogens
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Mg is a member of which family?
D) alkaline earth metals
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Xe is a member of which family?
D) noble gases
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Ions are formed when atoms
A) gain or lose electrons.
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When an atom gains an electron, the resulting particle is called
A) an anion
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What is the charge on the barium ion?
C) 2+
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How many protons and electrons are present in O2-?
C) 8 protons and 10 electrons
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How many electrons would be in a -2 charged anion of sulfur?
A) 18
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Isotopes are:
B) atoms of the same element that have different number of neutrons.
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An atom of a carbon-14 isotope would contain
B) 6 protons, 8 neutrons and 6 electrons
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An atom that has the same number of neutrons as 138/56 Ba is:
D) 136/54 Xe
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When elements combine to form compounds,
A) their properties change completely.
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How many carbon atoms are in the formula
Al2(CO3)3?
D) 3
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Which formula shows the proper use of parentheses?
A) Ca(NO3)2
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How many of each type of atom are there in the formula (NH4)2HPO4?
D) N = 2, H = 9, P = 1, O = 4
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Carbon is considered which of the following?
D) atomic element
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Fouorine is considered which of the following?
D) molecular element
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What is the formula for an ionic compound made of magnesium and sulfur?
D) MgS
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The ionic compound that forms between potassium and oxygen is
A) K2O
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What is the name of Ca(NO3)2
C) calcium nitrate
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Which formula shown is incorrect for the name given?
C) lithium sulfate: LiSO4
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The charge of a vanadium ion in the compound V2O5 is:
C) 5+
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What is the name of the molecular compound SO3?
B) sulfur trioxide
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What is correct name of the compound whose formula is BF3?
C) boron trifluoride
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What is the formula mass for potassium nitrate?
C) 101.10 amu
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What is the correct value for Avogadro's Number?
C) 6.022 x 1023
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How many atoms are in 5.8 moles of He?
D) 3.49 x 1024
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How many atoms are in 1.50 moles of fluorine gas?
C) 1.81 x 1024
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One mole of boron has a mass of ______g.
C) 10.811
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One mole of oxygen gas has a mass of _____g.
C) 32.0
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What is the mass in grams of 5.40 moles of lithium?
D) 37.5
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How many moles of iron are contained in 1.75 kg of iron?
C) 31.3
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How many hydrogen atoms are in 35.0 grams of hydrogen gas?
D) 1.05 x 1025
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What is the mass of 1.56 x 1021 atoms of magnesium in grams?
B) 0.0630
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The mass of one mole of carbon dioxide is _______g.
A) 44.01
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What is the mass in grams of 1 mole of P2O5?
A) 141.96 g
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Which of the following has the lowest number of atoms?
C) (NH4)2Cr2O7
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The molecular weight of Ca3(PO4)2 is _______.
D) 246
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If 3.011 x 1023 molecule have a mass of 20.04 grams, what is the molar mass of this substance?
C) 10.02 g/mol
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One mole of amonium nitrate contains:
D) 2 moles of nitrogen.
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What is the mass percent of chloride in hydrochloric acid?
D) 97.2
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The empirical formula of a compound:
C) indicates the simplest ratio of atoms in the compound.
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Which of the following is already in its empirical forrmula?
B) C5H12O2
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The chemical formula CH2O can be classified as:
B) empirical, possibly molecular.
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What would the empirical formula be for the molecular compuond C6H9O4?
E) none of the above
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A reaction which forms a gaseous product is an example of a _________.
D) gas evolution reaction
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A reaction which forms a solid product is an example of a ________.
D) precipitation reaction
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When the equation, __N2 + __H2 ---> __NH3 is balanced, the coefficient of hydrogen is:
D) 3
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What are the coeffecients for the following reaction when it is properly balanced?
__HCl + __Mg ----> __MgCl2 + __H2
C) 2, 1, 1, 1
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What are the coefficients for the following reacation when it is properly balanced?
__nitrogen monoxide + __carbon monoxide --> __nitrogen + __carbon dioxide
A) 2, 2, 1, 2
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An aqueous solution is:
B) water with another compound dissolved in it.
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Which of the following compounds is INSOLUBLE?
B) magnesium phosphate
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Which of the following compounds is SOLUBLE?
C) aluminum sulfate
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The compoud sodium sulfate is soluble in water. When this compound dissolves in water, which ion isted below would be present in the solution?
A) SO42-
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In writing the chemical equation for a precipitation reaction, what abbreviation of the physical state must appear with one of the products?
A) (s)
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Which compound would not form ions in the complete ionic equation?
B) PbI2
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What is the correct complete ionic equation?
D)
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What is the correct net ionic equation?
A)
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What is the net ionic equation for the reaction of hydrochloric acid with potassium hydroxide?
D) H+ + OH- ----> H2O
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What type of a reaction occurs when a hydrochloric acid solution is mixed with a sodium bicarbonate solution?
B) gas evolution
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What type of reaction occurs when potassium metal reacts with fluorine gas?
D) oxidation-reduction
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Methane gas (CH4), on complete combustion in air, produces:
A) 1 and 3 only
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What type of reaction is the generic equation
A + B ---> AB
A) synthesis/ combination
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What type of reaction is the generic equation
AB + CD ---> AD + CB
C) double-displacement
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How many moles of water are made from complete reaction of 1.4 moles of hydrogen gas?
C) 1.4
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How many grams of water are made from the reaction of 4.0 grams of hydrogen gas?
A) 36
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When 4.50 mol of H2O are formed, the amount of NO formed is
C) 3.00 mol.
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The theoretical yield of a reaction is 75.0 grams of product and the actual yield is 42.0g. What is the percent yield?
B) 56.0
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How many moles of water are neededd to react with 2.2 miles of Li2O?
D) 2.2
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If the theoretical yield of the reaction below corresponds to 99.2 g and the actual yield was 60.9 g, calculate the percent yield.
B) 61.4
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Starting with 156g of Li2O and 33.3 g H2O, decide which reactant is present in limiting quantities.
B) water
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The balanced equation involves the corresponding coefficients _________.
A) 1:3:2:3
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The theoretical number of carbon dioxide moles produced from 3 moles C2H6O is _______.
A) 6
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The theoretical number of moles of water produced from 2 moles of C2H6O is _______.
A) 6
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What is the theoretical mass of carbon dioxide produced from one mole of C2H6O?
C) 88g
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The distance between adjacent wave crests is called
C) wavelength
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The number of cycles of a wave that passes a stationary point in one second is called its
C) frequency.
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Which color of the visible spectrum has the longest wavelength (750 nm) ?
B) red
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How are wavelength and frequency of light related?
A) Wavelength increases as the frequency decreases.
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Which form of electromagnetic radiation has the shortest wavelength?
A) Gamma Rays
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When sunglight is passed through a prism, what is observed?
C) continuous spectrum
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The principal quantum number (n):
C) specifies the principal shell of the orbital
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How many subshells are there in the n = 4 principal shell?
C) 4
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The subshell leter:
B) specifies the 3-D shape of the orbital.
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The n = ____ principal shell is the lowest that may contain a d-subshell.
D) 3
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Which subshell letter corresponds to a 4-leaf clover orbital pattern?
D) d
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The "d" subshell can hold a maximum of ___ electrons.
B) 10
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How many electrons can exist in an orbital?
D) 2
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Which element is represented by the electron configuration 1s2 2s2 2p2?
B) C
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What is the electron configuration for Kr?
D)
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How many core electrons are in a chlorine atom?
D) 10
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Which Lewis structure below correctly represents KCl?
B) K+ [:Cl:]-
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Lewis theory predicts that the formula of a compound formed between bromine and aluminum is:
B) AlBr3
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When a nonmetal bonds with a nonmetal
D) all of the above are true
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What is the correct Lewis structure for water?
A) H-O-H
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What is the correct Lewis structure for Br2?
C) :Br - Br:
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The Lewis structure for carbon monoxide is :C three O:
This structure shows
B) 2 lone pains and 3 bonding pairs.
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Which sequence below represents the proper order of increasing bond strengtrh?
B) single < double < triple
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The correct Lewis structure for BF3 would have exactly:
C) no double bonds
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What is the electron geometry if you have 4 electron groups around the center atom?
A) tetrahedral
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What is the molecular geometry of PH3?
A) trigonal pyramidal
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Which substance listed below is a polar molecule?
B) Cl2O
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Which molecule listed below is a nonpolar molecule?
All of the compounds
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Which compound below will dissolve in water?
B) NH3
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