Chemistry Chapter 7 Test Questions – Flashcards
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A chemical formula includes the symbols of the elements in the compound and subscripts that indicate
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Number of atoms or ions of each element that are combined in the compound
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A chemical formula for a molecular compound represents the composition of
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A molecule
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How many atoms of fluorine are present in a molecule of carbon tetrafluoride, CF4?
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4
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The formula for carbon dioxide, CO2, can represent
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all of the above
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What is the formula for zinc fluoride?
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ZnF2
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What is the formula for the compound formed by calcium ions and chloride ion?
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CaCl2
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What is the formula for the compound formed by lead (II) ions and chromate ions?
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PbCrO4
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What is the formula for aluminum sulfate?
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Al2(SO4)3
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What is the formula for barium hydroxide?
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Ba(OH)2
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Name the compound Ni(ClO3)2
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nickel (II) chlorate
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Name the Zn3(PO4)2
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zinc phosphate
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Name the compound KClO3
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potassium chlorate
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Name the compound Fe(NO3)2
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iron (II) nitrate
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Name the compound Al2S3
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aluminium sulfide
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Name the compound CF4
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carbon tetrafluoride
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Name the compound SiO2
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silicon dioxide
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Name the compound SO3
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sulfur trioxide
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Name the compound N2O3
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dinitrogen trioxide
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What is the formula for silicon dioxide?
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SiO2
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What is the formula for dinitrogen trioxide?
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N2O3
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What is the formula for sulfur dichloride?
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SCl2
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What is the formula for diphosphorus pentoxide?
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P2O5
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what is the formula for hydrochloric acid?
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HCl
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the oxidation number of fluorine is
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-1 in all compounds
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What is the oxidation number of oxygen in most compounds
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-2
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what is the oxidation number of hydrogen in compounds containing metals?
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-1
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in a polyatomic ion, the algebraic sum of the oxidation numbers of all atoms is equal to
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the charge of the ion
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what is the oxidation number of oxygen in H2O2
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-1
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what is the oxidation number of hydrogen in KH
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-1
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what is the oxidation number of hydrogen in H2O
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3
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what is the oxidation number in SO2
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1
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what is the oxidation number of sulfur in H2SO4
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6
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what is the oxidation number of oxygen in CO2
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-2
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Name the compound N2O2 using the stock system
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nitrogen (II) oxide
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Name the compound SO2 using the stock system
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Sulfur (IV) oxide
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name the compound CCl4 using the stock system
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carbon (IV) chloride
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name the compound H2O using the stock system
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hydrogen (I) oxide
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name the compound CO2 using the stock system
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carbon (IV) oxide
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name the compound PBr5 using the stock system
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phosphorous (V) bromide
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the molar mass of an element is the mass of one
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mole of the element
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what is the sum of the atomic masses of all the atoms in a formula for a compound
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formula mass
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What is the formula mass of magnesium chloride, MgCl2
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95.21 amu
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what is the formula mass of ethyl alcohol, C2H5OH
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46.08 amu
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What is the formula mass of (NH4)2SO4
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132.16 amu
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the molar mass of MgI2 is
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the sum of the masses of 1 mol of Mg and 2 mol of I
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the molar mass of NO2 is 46.01 g/mol. how many moles of NO2 are present in 114.95 g
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2.498 mol
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the molar mass of CCl4 is 153.81 g/ mol. how many grams of CCl4 are needed to have 5.000 mol
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769.0 g
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the molar mass of H2O is 18.02 g/mol. how many grams of H2O are present in 0.20 mol
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3.6 g
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the ,olar mass of LiF is 25.95 g/mol. how many moles of LiF are present in 10.37 g
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0.3998 mol
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the molar mass of CS2 is 76.15 g/mol. How many grams of CS2 are present in 10.00 mol
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761.5 g
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the molar mass of NH3 is 17.03 g/mol. how many moles NH3 are present in 107.1 g
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6.289 mol
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what is the mass of 0.240 mol glucose c6h12o6
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43.2 g
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how many Cl- ions are present in 2.00 mol of KCl
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1.20 x 10^24
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how many OH- ions are present in 3.00 mol of Ca(OH)2
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3.61 x 10^24
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how many oxygen atoms are there in 0.500 mol of CO2
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6.02 x 10^23
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how many Mg2+ ions are found in 1.00 mol of MgO
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6.02 x 10^23
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if 0.500 mol of Na+ combines with 0.500 mol of Cl- to form NaCl, how many formula units of NaCl are present
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3.01 x 10^13
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how many molecules are there in 5.0 g of methyl alcohol, CH3OH
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9.4 x 10^22
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what is the percentage composition of CF4
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13.6% C, 86.4% F
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what is the percentage composition of CO
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43% C, 57% O
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what is the percentage composition of CuCl2
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47.27% Cu, 52.73% Cl
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the percentage composition of sulfur in SO2 is about 50%. What percentage of oxygen in this compound
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50%
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what is the mass percentage of OH- in Ca(OH)2
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45.9%
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what is the mass percentage of chlorine in NaCl?
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60.7%
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a formula that shows the simplest whole number ration of the atoms in a compound is the
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empirical formula
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the empirical formula is always the accepted formula for a
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ionic compound
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the empirical formula for a compound shows the symbols of the elements with subscripts indicating the
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smallest whole number ratio of atoms
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the empirical formula may not represent the actual composition of a unit a(n)
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molecular compound
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what is the empirical formula for a compound that is 31.9% potassium, 28.9% chlorine, 39.2% oxygen?
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KClO3
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what is the empirical formula for a compound that is 23.6% phosphorus and 56.4% oxygen
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P2O5
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to find the molecular formula from the empirical formula one must determine the compound's
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formula mass
