CHEM 1153 Final UMD Exam with All Correct & 100%
Verified Answers |Latest Update| Already Graded A+
Which one of the following statements is correct? ✔Correct Answer--The composition is uniform
throughout a homogenous mixture
Which one of the following substances is classified as an element? ✔Correct Answer--P4
A(n)________ is a pure substance that is composed of only one type of atom ✔Correct Answer--
element
The density of liquid mercury is 13.5 g/cm3. What mass of mercury will fill a 12oz soda can?
✔Correct Answer--4.80 x 10^3
How many protons, neutrons, and electrons are in a yttrium-89 atom? ✔Correct Answer--39
protons, 50 neutrons, 39 electrons
What is the atomic symbol for an element with 38 protons and 50 neutrons? ✔Correct Answer--
88top 38 bottom Sr
Two isotopes of a given element will have the same number of ____, but a different number of
______ in their nucleus? ✔Correct Answer--protons, neutrons
All of the following are examples of intrusive properties except for ✔Correct Answer--mass
What is the Correct Answer- to the following expression: (53+63)x0.17051? ✔Correct Answer--19.8
a covalent bond results when ______ ✔Correct Answer--electrons are shared between a pair of
atoms
What is the correct name for PbO2? ✔Correct Answer--Lead (IV) Oxide
what is the correct formula for hypochlorous acid? ✔Correct Answer--HClO
The formula for calcium dichromate is Ca(Cr2O7). what is the formula for aluminum dichromate?
✔Correct Answer--Al2(Cr2O7)3
Which one of the following has a bonding capacity of 3? ✔Correct Answer--P
How many valence electrons are in the Lewis structure for BrO- ? ✔Correct Answer--14
One reason electronegativity increases from left to right across a period is______ ✔Correct
Answer--an increase in the number of protons in nucleus
Which one of the following bonds is the weakest? ✔Correct Answer--C-C
the lattice energy for ionic crystals increases (becomes more negative) as the charge on the
ions________ and the size of the ions ________ ✔Correct Answer--increases, decreases
, Dispersion forces are due to _______ ✔Correct Answer--temporary dipoles
a dipole dipole interaction is an intermolecular force that occurs between ✔Correct Answer--two
polar molecules
identify the polar molecule ✔Correct Answer--CHCl3
When two liquids mix completely in all proportions, they are ______ ✔Correct Answer--miscible
based on their boiling points, which of the following compounds has the largest dipole dipole
interaction? ✔Correct Answer--acetonitrile, CH3CN
a hydration sphere forms around an ion in aqueous solution due to ✔Correct Answer--ion dipole
interactions
what is the theoretical yield of phosphoric acid ( H3PO4, 98.0 g/mol) when 10.0 g P4O10 (284 g/mol)
reacts with excess water (18.02 g/mol)? ✔Correct Answer--13.8 g
What volume of 2.50 M NaOH (40.00 g/mol) contains 0.100 mole of NaOH ✔Correct Answer--40.0
mL
How many grams of solid potassium chlorate (KClO3, 122.55 g/mol) are needed to make 150 mL of
0.50 M solution? ✔Correct Answer--9.2 g
What volume of 12.0 M HCl solution needs to be diluted to produce 500.0 mL of 3.00 M HCl
solution? ✔Correct Answer--0.125 L
If 5.15 g Fe(NO3)3 is dissolved in enough water to make exactly 150.00 mL of solution, what is the
molar concentration of nitrate ion? (Fe(NO3)3=241.86 g/mol) ✔Correct Answer--0.426 M
Which of the following would behave as a strong electrolyte in water? ✔Correct Answer--Table
salt, NaCl
Which of the following compounds is a weak acid? ✔Correct Answer--CH3CO2H
Which of the following ionic compounds is insoluble in water? ✔Correct Answer--Cu3(PO4)2
What is the formula of the precipitate that forms when aqueous ammonium phosphate and aqueous
copper (II) Chloride are mixed? ✔Correct Answer--Cu3(PO4)2
what is the oxidation of sulfur in the thiosulfate ion (S2)32-)? ✔Correct Answer--+2
Which of the following is the greatest length? ✔Correct Answer--5.0 x 10^6 nm
The nucleus of an atom ✔Correct Answer--Does not account for a large amount of the total
volume of an atom
a pure substance composed of two or more different elements is ✔Correct Answer--a chemical
compound
Verified Answers |Latest Update| Already Graded A+
Which one of the following statements is correct? ✔Correct Answer--The composition is uniform
throughout a homogenous mixture
Which one of the following substances is classified as an element? ✔Correct Answer--P4
A(n)________ is a pure substance that is composed of only one type of atom ✔Correct Answer--
element
The density of liquid mercury is 13.5 g/cm3. What mass of mercury will fill a 12oz soda can?
✔Correct Answer--4.80 x 10^3
How many protons, neutrons, and electrons are in a yttrium-89 atom? ✔Correct Answer--39
protons, 50 neutrons, 39 electrons
What is the atomic symbol for an element with 38 protons and 50 neutrons? ✔Correct Answer--
88top 38 bottom Sr
Two isotopes of a given element will have the same number of ____, but a different number of
______ in their nucleus? ✔Correct Answer--protons, neutrons
All of the following are examples of intrusive properties except for ✔Correct Answer--mass
What is the Correct Answer- to the following expression: (53+63)x0.17051? ✔Correct Answer--19.8
a covalent bond results when ______ ✔Correct Answer--electrons are shared between a pair of
atoms
What is the correct name for PbO2? ✔Correct Answer--Lead (IV) Oxide
what is the correct formula for hypochlorous acid? ✔Correct Answer--HClO
The formula for calcium dichromate is Ca(Cr2O7). what is the formula for aluminum dichromate?
✔Correct Answer--Al2(Cr2O7)3
Which one of the following has a bonding capacity of 3? ✔Correct Answer--P
How many valence electrons are in the Lewis structure for BrO- ? ✔Correct Answer--14
One reason electronegativity increases from left to right across a period is______ ✔Correct
Answer--an increase in the number of protons in nucleus
Which one of the following bonds is the weakest? ✔Correct Answer--C-C
the lattice energy for ionic crystals increases (becomes more negative) as the charge on the
ions________ and the size of the ions ________ ✔Correct Answer--increases, decreases
, Dispersion forces are due to _______ ✔Correct Answer--temporary dipoles
a dipole dipole interaction is an intermolecular force that occurs between ✔Correct Answer--two
polar molecules
identify the polar molecule ✔Correct Answer--CHCl3
When two liquids mix completely in all proportions, they are ______ ✔Correct Answer--miscible
based on their boiling points, which of the following compounds has the largest dipole dipole
interaction? ✔Correct Answer--acetonitrile, CH3CN
a hydration sphere forms around an ion in aqueous solution due to ✔Correct Answer--ion dipole
interactions
what is the theoretical yield of phosphoric acid ( H3PO4, 98.0 g/mol) when 10.0 g P4O10 (284 g/mol)
reacts with excess water (18.02 g/mol)? ✔Correct Answer--13.8 g
What volume of 2.50 M NaOH (40.00 g/mol) contains 0.100 mole of NaOH ✔Correct Answer--40.0
mL
How many grams of solid potassium chlorate (KClO3, 122.55 g/mol) are needed to make 150 mL of
0.50 M solution? ✔Correct Answer--9.2 g
What volume of 12.0 M HCl solution needs to be diluted to produce 500.0 mL of 3.00 M HCl
solution? ✔Correct Answer--0.125 L
If 5.15 g Fe(NO3)3 is dissolved in enough water to make exactly 150.00 mL of solution, what is the
molar concentration of nitrate ion? (Fe(NO3)3=241.86 g/mol) ✔Correct Answer--0.426 M
Which of the following would behave as a strong electrolyte in water? ✔Correct Answer--Table
salt, NaCl
Which of the following compounds is a weak acid? ✔Correct Answer--CH3CO2H
Which of the following ionic compounds is insoluble in water? ✔Correct Answer--Cu3(PO4)2
What is the formula of the precipitate that forms when aqueous ammonium phosphate and aqueous
copper (II) Chloride are mixed? ✔Correct Answer--Cu3(PO4)2
what is the oxidation of sulfur in the thiosulfate ion (S2)32-)? ✔Correct Answer--+2
Which of the following is the greatest length? ✔Correct Answer--5.0 x 10^6 nm
The nucleus of an atom ✔Correct Answer--Does not account for a large amount of the total
volume of an atom
a pure substance composed of two or more different elements is ✔Correct Answer--a chemical
compound
