CHEM 132
Answer the following for the reaction NiCl2(aq) + 2NaOH(aq)------->Ni(OH)2(s) + 2NaCl(aq) What is the molarity of 30.0mL of a NiCl2 solution that reacts completely with 10.0mL of a 0.250 M NaOH solution?
0.042 M
A 10.0 mL of 0.121 M H2SO4 is neutralized by 17.1 mL of KOH solution. The molarity of the KOH solution is
0.142 M
What is the molarity of a KCl solution made by diluting 75.0 mL of a 0.200 M solution to a final volume of 100. mL?
0.150 M
25.0 mL of 0.212 M NaOH is neutralized by 13.6 mL of an HCl solution. The molarity of the HCl solution is
0.390 M
The number of moles of MgO produced when 0.20 mole of O2 reacts completely is 2Mg + O2 → 2MgO
0.40 mole.
Ethene (C2H4) burns in oxygen to give CO2 and H2O. How many moles of oxygen are needed to react with 0.254 moles of ethene? C2H4 + 3 O2 → 2 CO2 + 2 H2O
0.762 moles
A 25.0 mL sample of H2SO4 requires 20.0 mL of 2.00 M KOH for complete neutralization. What is the molarity of the acid? H2SO4 + 2KOH → K2SO4 + 2H2O
0.800 M
Which of the following is the correct numbering for the three chlorines on the following molecule?
1,2,5
What is the name of this compound? CH3-CH2-CH2-CH2-Cl
1-Chlorobutane
A 25.0 mL sample of H3PO4 requires 50.0 mL of 1.50 M NaOH for complete neutralization. What is the molarity of the acid? H3PO4 + 3NaOH → Na3PO4 + 3H2O
1.00 M
How many milliliters of 0.400 M NaOH are required to completely neutralize 20.0 mL of 0.200 M HCl?
10.0 mL
Cyclopropane, C3H6, is an anesthetic given by inhalation. How many grams are in 0.25 mole of cyclopropane?
10.5 g
How many protons are in an isotope of sodium with a mass number of 25?
11
What volume of 0.716 M KBr solution is needed to provide 10.5 g KBr?
123 mL
A Ringer's solution contains the following concentrations (mEq/L) of cations: Na+ 147, K+ 4, and Ca2+ 4. If Cl- is the only anion in the solution, what is the Cl- concentration, in mEq/L?
155 mEq/L
In the body, C2H6O, reacts according to the following equation: C2H6O(aq)-> 2CO2(g)+3H2O(aq) How many grams of O2 are needed to react with 8.4g of ethanol?
17.5 g
A patient needs to receive 85 grams of glucose every 12 hours. What volume of a 5.0%(m/v) glucose solution needs to be administered to the patient each 12 hours?
1700 mL
Write the electronic configurations for the following atoms and ions: (example the electron configuration for Li would be written 1s2, 2s1. Please separate the orbitals with a comma and a space)
17Cl: 1s2, 2s2, 3s2, 3p5 22Ti: 1s2, 2s2, 2p6, 3s2, 3p6, 4s2, 3d2 46Pd: 1s2, 2s2, 2p6, 3s2, 3p6, 4s2, 3d10, 4p6, 5s2, 4d8
The formula for aluminum chloride is AlCl3. How many moles of chloride ions are in 6.0 moles of aluminum chloride?
18 moles of chloride ions
Determine the final volume, in milliliters of the followin: a 5.0 % (m/v) glucose solution prepared from a 75 mL of a 12% (m/v) glucose solution.
180 mL
Calculate the molar mass for glucose, C6H12O6
180.2 g
A dose of aspirin of 5.0 mg per kilogram of body weight has been prescribed to reduce the fever of an infant weighing 8.5 pounds. The number of milligrams of aspirin that should be administered is
19 mg.
A nugget of gold with a mass of 521 g is added to 50.0 mL of water. The water level rises to a volume of 77.0 mL. What is the density of the gold?
19.3 g/mL
An aquarium store unit requires 75000 mL of water. How many gallons of water does this amount convert to?
19.82 gal
How many moles of H2O are produced when 1 mole of Mg(OH)2 reacts with 1 mole of H2SO4?
2
How many structural isomers does the compound with formula C4H10 have?
2
In the following reaction, when the equation is correctly balanced, what is the correct coefficient for sodium chloride? Pb(NO3)2 (aq) + NaCl(aq) → PbCl2 (s) + NaNO3(aq)
2
What coefficients go in each blank?_____ Rb + _____ H2O → _____ Rb2O + _____ H2
2, 1, 1, 1
What is the correct IUPAC name of this compound?
2,2-dimethylbutane
A patient needs 41.6 mg of an antibiotic per kilogram of body weight each day. If the patient weighs 58.6 kilograms, how much antibiotic, in milligrams, should the patient receive each day for optimal therapy?
2,437.76
What volume of a 1.5 M KOH solution is needed to provide 3.0 moles of KOH?
2.0 L
For the question(s) that follow, consider the following equation. 2Mg + O2 → 2MgO The number of moles of oxygen gas needed to react with 4.0 moles of Mg is
2.0 moles.
What is the mass of 2.00 L of an intravenous glucose solution with a density of 1.15 g/mL?
2.30 kg
What is the weight precent of vitamin C in a solution made by dissolving 1.30 g of vitamin C, C6H8O6, in 55.0 g of water?
2.31%
Calculate the pH for an aqueous solution of acetic acid that contains 4.15 x 10-3 M hydronium ion
2.38
A doctor's order is 0.125 g of ampicillin. The liquid suspension on hand contains 250 mg/5.0 mL. How many milliliters of the suspension are required?
2.5 mL
calculate the pH for an aqueous solution of acetic acid that contains 2.15 x 10-3 M H+
2.67
A patient received 2.0 g of NaCl in 8 h, How many milliliters of a 0.90% (m/v) NaCl (saline) solution were delivered?
222.2 mL
A doctor orders 100 mL of 2.0 %(m/v) ibuprofen. If you have 8.0% (m/v) ibuprofen on hand, how many milliliters do you need?
25 mL
What is the concentration, in mass percent, of a solution prepared from 50.0 g NaCl and 150.0 g of water?
25.0%
What is the molar mass of Mg3(PO4)2, a substance formerly used in medicine as an antacid?
262.9 g
Which of the following is the correctly balanced equation for the complete neutralization of H3PO4 with Ca(OH)2
2H3PO4 + 3Ca(OH)2 → Ca3(PO4)2 + 6H2O
Which of the following gives the balanced equation for this reaction? K3PO4 + Ca(NO3)2 → Ca3(PO4)2 + KNO3
2K3PO4 + 3Ca(NO3)2 → Ca3(PO4)2 + 6KNO3
Which of the following gives the balanced equation for this reaction? K3PO4 + Ca(NO3)2 → Ca3(PO4)2 + KNO3
2K3PO4 + 3Ca(NO3)2 → Ca3(PO4)2 + 6KNO3
How many milliliters of a 25% (m/v) NaOH solution would contain 75 g of NaOH?
3.0 × 102 mL
Rubbing alcohol is 70.% isopropyl alcohol by volume. How many mL of isopropyl alcohol are in a 1 pint (473 mL) container?
331 mL
On a hot day, the thermometer read 95 °F. What is the temperature in degrees Celsius?
35 °C
A sample of chlorine has two naturally occurring isotopes. The isotope Cl-35 (mass 35.0 amu) makes up 75.8% of the sample, and the isotope Cl-37 (mass = 37.0 amu) makes up 24.3% of the sample. What is the average atomic mass for chlorine?
35.5 amu
When 4 moles of aluminum are allowed to react with an excess of chlorine gas, Cl2, how many moles of aluminum chloride are produced?
4 moles
Consider a 4% starch solution and a 10% starch solution separated by a semipermeable membrane. Which starch solution will decrease in volume as osmosis occurs?
4%
Which of the following is an acceptable name for the following molecule?
4-bromotoluene
How many moles of water, H2O, are present in 75.0 g of H2O?
4.17 moles
Diamond has a density of 3.52 g/mL. What is the volume in cubic centimeters of a diamond with a mass of 15.1 g?
4.29 cm3
The EPA limit for lead in the soil of play areas is 400 ppm. This is the same as
400 mg lead in each kilogram of soil.
When 10.0 g of NH3 reacts, the actual yield of N2 is 8.50 g. What is the percent yield? 4NH3(g) + 6NO(g) → 5N2(g) + 6H2O(l)
41.3%
When 56.6 g of calcium is reacted with 30.5 g of nitrogen gas, 32.4 g of calcium nitride is produced. What is the percentage yield of calcium nitride for this reaction? 3Ca(s)+N2(g)->Ca3N2(s)
46.5 %
What is the [OH-] in a solution that has a [H3O+] = 2.0 × 10-4 M?5.0 × 10-11 M
5.0 × 10-11 M
Which of the following gives the correct numbers of protons, neutrons, and electrons in a neutral atom of 118/50 Sn?
50 protons, 68 neutrons, 50 electrons
What coefficient is placed in front of O2 to complete the balancing of the following equation? C5H8 + ? O2 → 5CO2 + 4H2O
7
A solution is 2.25% (m/m) by weight NaHCO3. How many grams of NaHCO3 are in 350.0 g of solution?
7.87 g
How many grams are in 2.30 moles of Ca3(PO4)2?
714 grams
How many grams of Fe2O3 are there in 0.500 mole of Fe2O3?
79.8 g
How many grams of glucose are needed to prepare 400. mL of a 2.0%(m/v) glucose solution?
8.0 g
A bottle of champagne is 11% (v/v) alcohol. If there are 750 mL of champagne in the bottle, what is the volume, in milliliters of alcohol?
82.5 mL
A 50.0 g silver object and a 50.0 g gold object are both added to 75.5 mL of water contained in a graduated cylinder. What is the new water level in the cylinder?
82.9 mL
How many grams of CO2 are produced from 125 g of O2 and excess CH4 ? CH4 + 2O2 → CO2 + 2H2O
85.9 g of CO2
Which of the following descriptions of a subatomic particle is correct
A proton has a positive charge and a mass of approximately 1 amu
The neutralization reaction between Al(OH)3 and HNO3 produces the salt with the formula
Al(NO3)3.
Which element would have physical and chemical properties similar to chlorine?
Br
Which of the following compounds have cis-trans isomers?
CH3 - CH = CH - CH3
Give the correct charge for ions of the following elements.
Ca: 2+ Cl: 1- O: 2- Al: 3+ K: 1+
Water is a polar solvent and carbon tetracchloride (CCl4) is a nonpolar solvent. In which solvent is each of the following, which is found or used in the body, more likely to be soluble?
CaCO3 (calcium supplement), ionic: water retinol (vitamin A), nonpolar: CCl4 sucrose (table sugar), polar: water cholesterol (lipid), nonpolar: CCl4
Which of the following statements is correct about the valence shell electrons of carbon?
Carbon has 4 valence shell electrons.
What is the element with the electron configuration 1s22s22p63s23p5?
Cl
Which one of the following compounds contains an ion with a 3+ charge?
FeCl3
Identify the Bronsted-Lowry acid in the following reaction. H2O + CO32- → HCO3- + OH-
H2O
When dissolved in water, which of the following compounds is an Arrhenius acid?
HCN
Identify the following as formulas of organic or inorganic compounds.
KCl: inorganic C4H10: organic CH3CH2OH: organic H2SO4: inorganic CaCl2: inorganic CH3CH2Cl: organic
Which of the following is a neutralization reaction?
KOH + HNO3 → H2O + KNO3
Which of the following substances contains a nonpolar covalent bond?
N2
Which of the following compounds exhibits hydrogen bonding?
NH3
Which of the following molecules can form hydrogen bonds?
NH3
What are the correct formula and name of the compound that forms between the following pairs of ions? NH4+ and NO3-
NH4NO3, Ammonium nitrate
Indicate the type of bonding you would expect between the following elements.
Na and F: oonic N and F: polar covalent F and F: nonpolar covalent He and F: none H and F: polar covalent
Which of the following is correctly identified?
NaOH, strong base
What is the identity of an unknown substance, "X" if X has the electron configurations of 1s22s22p63s23p64s23d8?
Nickel
Which of the following is true of nonane, C9H20, which has a density of 0.79 g/mL, melts at -51°C, and boils at 157°C?
Nonane floats on the surface of water.
When 3.05 moles of CH4 are mixed with 5.03 moles of O2 the limiting reactant is __________. CH4 + 2O2 → CO2 + 2H2O
O2
Matching: State the number of electrons lost or gained when the following elements form ions:
O: 2e- gained Group 2A: 2e- lost F: 1e- gained N: 3e- gained
Matching: State the number of protons and electrons in each of the following ions:
P3-, needed for bones and teeth-15 protons and 18 electrons: 15 protons and 18 electrons F-, used to strengthen tooth enamel,: 9 protons and 10 electrons Mg2+, needed for bone and teeth,: 12 protons and 10 electrons Ca2+, needed for bones and teeth,: 20 protons and 18 electrons
What are the correct the formula and name of the compound that forms between following pair of ions? Pb4+ and HPO42-
Pb2(HPO4)4, Lead hydrogen phosphate
Which of the following statements is correct about the physical and chemical change of a substance?
Physical change only change the physical appearance of a substance, but chemical composition stays the same
Aluminum sulfate, Al2(SO4)3, is used in some antiperspirants. How many moles of S are present in 3.0 moles of Al2(SO4)3, how many moles of aluminum ions (Al3+) are present in 0.4 moles of Al2(SO4)3 and how many moles sulfate ions (SO42-) are present in 1. 5 moles of Al2(SO4)3?
S: 9 moles; Al3+: 0.8 moles; SO42-: 4.5 moles
Matching: Identify each of the following molecules as polar or nonpolar:
SeF2: Polar PBr3: Polar SiCl4: Non-polar
When a liquid is boiling, its temperature does not change.
True
According to the Arrhenius concept, if NaOH were dissolved in water, it would act as
a base
Which solution has the lowest pH?
a buffer made with 0.10 M acetic acid and 0.01 M sodium acetate
A homogeneous mixture that does not settle out upon standing is
a colloid.
Ammonium chloride (NH4Cl) is an example of
a compound
a solution with a hydrogen ion concentration of 3.25 x 10-5 M is _________ and has a hydroxide ion concentration of ________.
acidic, 3.08 x 10-10
Which of the following can be made from synthetic polymers?
all of the above
Which of the following polyatomic ions has a positive charge?
ammonium
VSEPR theory predicts that simple carbon compounds will form bonds that are
as far apart as possible
In a molecule with covalent bonding,
atoms are held together by sharing electrons.
According to the Atomic Theory,
atoms are neither created nor destroyed during a chemical reaction
The octet rule indicates that
atoms lose, gain, or share valence electrons to have 8 valence electrons.
Which of the following is a physical property of both liquids and gases?
b. has randomly arranged particles
Rank the following compounds in order of decreasing boiling point a) heptane; b) cycloheptane; c) 2-methylhexane
b>a>c
Which one of the following substances will float in gasoline, which has a density of 0.66 g/mL?
balsa wood (density = 0.16 g/mL)
A solution with a hydroxide ion concentration of 4.15 x 10-4 is _______________ and has a hydronium ion concentration of ________________
basic, 2.41 x 10-11 M
Which of the following is a chemical change?
burning sugar
What elements are in hydroxyapatite, Ca5(PO4)3OH , a major compound in human bones and teeth?
calcium, phosphorus, oxygen, hydrogen
The one element necessarily present in every organic compound is
carbon
Which is an appropriate name for CH2=CH — Cl?
chloroethene
The reaction of carbon with oxygen to produce carbon monoxide is an example of which class of reaction?2C(s) + O2(g) → 2CO(g)
combination
All of the following are types of addition reactions for alkenes except _______.
combustion
The following reaction takes place when an electric current is passed through water. It is an example of a ________ reaction. 2H2O → 2H2 + O2
decomposition
If a condition of hypoventilation occurs, the blood pH of the patient is expected to
decrease
In general, as the temperature increases, the solubility of gases in water ________ and the solubility of most solids in water ________.
decreases, increases
The main interactions between molecules of hydrogen chloride are examples of
dipole-dipole interactions.
The ability of an atom to attract the shared electrons in a covalent bond is its
electronegativity.
A formula that shows the arrangement of all bonds in a molecule is called a(n)
expanded structural formula
The % yield is the ratio of the theoretical yield to the actual yield multiplied by 100.
false
In the equation for the combustion of pentane, the coefficient of carbon dioxide is
five
Organic compounds that are poorly soluble in water behave that way because they are
generally nonpolar
Which of the following is an example of a physical change?
grinding coffee beans
An ionic compound
has a net charge of zero
Which of the following is a physical property of both liquids and gases?
has randomly arranged particles
When a piece of magnesium metal is added to hydrochloric acid, what gas is produced?
hydrogen
The strongest interactions between molecules of ammonia ( NH3 ) are
hydrogen bonds.
Valence electrons are electrons located
in the outermost energy level of an atom.
According to Henry's law, the solubility of a gas in a liquid
increases as the gas pressure above the liquid increases.
One reason ionic compounds do not dissolve well in nonpolar solvents is that
ionic interactions are too large for effective solvation to occur
Compounds that have the same molecular formula but different arrangements of atoms are called
isomers
The rubbing alcohol sold in drug stores often is composed of 70% isopropyl alcohol and 30% water. In this solution
isopropyl alcohol is the solvent
A solution with the same osmotic pressure as the blood is
isotonic to the blood.
f a hydrocarbon is unsaturated, it means that ______.
it has fewer than the maximum number of hydrogen atoms
The number of valence electrons found in an atom of a Group A element is equal to
its group number.
If octane and water are mixed, the result is
layer of octane sitting on top of a layer of water
Molarity is defined as moles of solute per
liter of solution
In ionic compounds, __________ lose their valence electrons to form positively charged __________.
metals; cations
If two protons and two neutrons of a fluorine atom are removed, a nucleus of what element remains?
nitrogen
In a molecule with a symmetrical arrangement of polar bonds, the overall molecule is
nonpolar
Which is not a gas at room temperature?
octane
The branch of chemistry that is the study of compounds containing carbon is called
organic chemistry
Which of the following polyatomic ions has a 3- ionic charge?
phosphate
Which of the following does NOT involve a change of state?
pouring water into a vacuum-insulated bottle
Match the location on the periodic table to the classification of elements that are found there.
right side- nonmetals left side- metals
In any balanced chemical equation, the number of each type of atom on both sides of the equation is
same.
The solubility of KI is 50 g in 100 g of H2O at 20°C. If 110 grams of KI are added to 200 grams of H2O,
saturated solution will form
The VSEPR theory allows us to determine the most favorable
shape of a molecule.
In liquid solutions, the component present in the larger amount is called the
solvent
Compounds that have the same molecular formula but differ in the way the atoms are arranged are called _______.
structural isomers
An Arrhenius acid is best defined as a
substance that dissociates in water to produce hydrogen ions
Which of the following is a chemical?
sugar
A molecule containing a carbon atom bonded to four chlorine atoms is called
tetrachloromethane
According to Markovnikov's rule, the hydrogen in HOH (water) adds to the carbon in the double bond
that has the greater number of hydrogen atoms attached.
When KCl dissolves in water
the K+ ions are attracted to the partially negative oxygen atoms of the water molecule.
In the name cyclohexane, the prefix cyclo means that _______.
the carbon atoms are joined in a ring
KBr does not dissolve well in nonpolar solvents because
the intermolecular foces in KBr are too strong for nonpolar solvents to break
According to the IUPAC convention for chemical naming, which part of a hydrocarbon is selected as the main chain for a hydrocarbon chain?
the longest continuous chain, regardless of bends
A chemical equation is balanced when
the number of atoms of each element is the same in reactants and products
The electron arrangement of any particular atom shows
the number of electrons in each energy level.
In an electron-dot structure of an element, the dots are used to represent
the valence electrons.
How many isomers are there for compound with a molecular formula of C5H12
three
How many structural isomers are there for C2H4Cl2?
two
Organic compounds with double or triple bonds are classified as
unsaturated compounds
Hydrogen sulfide, H2S, has a shape similar to
water
Which of the following is an example of potential energy?
water stored in a reservoir
Hydrogen sulfide, H2S, has a shape similar to
water.
