Chemistry Chapters 5-8
What is the charge of the ions formed by group 7A elements?
-1
What is the molarity of a solution made by dissolving 4.88 g of KCl in 423 mL of solution?
0.1555 M Kcl
A patient's systolic pressure is measures as 128 mm Hg. What is the pressure in units of atm?
0.168atm
How many moles are contained in 5.33 L of O2 at standard temperature and pressure?
0.238 mol of O2
A sample of neon gas has a volume of 5.0mL at a pressure of 1.50 atm.
0.25atm
What is the molarity of a solution made by dissolving 36.29g of NaCl in 2.30 L of solution?
0.270 M NaCL
What is the molarity of a 11.5% (w/v) glucose solution?
0.638 M
How many kilograms (kg) are there in 1 milligram (mg)?
1 x 10^6
Consider the oxidation of sodium metal to sodium oxide described by the balanced equation 4 Na +O2 yields 2Na2O what is the theoretical yield of Na2O in grams from 9.0 mol O2?
1,100 g of Na2O
Aluminum has a density of 2.70 g/ cm3. What volume is occupied by a block of aluminum which weighs 4.32 kg?
1.60 L
How many electrons can be accommodated in the 3d subshell?
10
Which quantity represents the largest amount of stored energy?
10 grams of fat
Complete the following table using the given balanced equation and the initial quantities of reactants Equation: N2. 2O2 yields 2 NO2 g?
10 molecules formed
Which sample contains the largest number of molecules?
100 g of CH4
The maximum level of lead allowed in drinking water is 15 ,g/kg
15 ppm
Air pressure at the bottom of Death Valley, at 282 ft below sea level, is 776 mm Hg. What are the partial pressures of O2 and N2, which compose 21% and 78% of the atmosphere, respectively?
160 mm Hg O2 and 610 mm Hg N2
A 54.2 L sample of gas at 115 K is heated to 345 k at constant pressure. What volume does the gas now occupy?
163 L
How many grams of glucose are contained in 555mL of 1.77M glucose solution?
177 g
What is the maximum number of electrons that can occupy the third (n=3) shell?
18
Which chemical equation is properly balanced
2 SO2 + O2 + 2H2O yields 2 H2SO4
The doctor prescribed 30 mL of a medication per dose for a patient. How many tablespoons should Sam tell the patient to take per dose?
2 tablespoons approximately
Which solution contains the smallest number of moles of sucrose?
2,000 mL of 5.0 x 10^-5 sucrose solution
Which solution has the greatest mass of solute?
2.00 L of a 0.75 M Ca(NO3)2 solution
An unknown substance has a mass of 56.8 g and a volume of 23.4 mL. What is the density of this unknown substance?
2.43 g/mL
Consider the reaction PCl3 + Cl yields to PCL5. If PCL3 = 0.78 M, (Cl2)= 0.44 M, what is the value of K?
2.6
Consider the combustion reaction of propane: C3H8 + 5 O2 yields 3 CO2 + 4 H20 where triangle H = -531 kcal. If 1.24 x 10^5 kcal of energy is released in the reaction, how many moles of propane were burned?
234 mol of C3H8
What is the formula weight of CO(NO3)3
244.96 amu
Given the calculation: 4.238 + 12.72 + 9.1 = ? What is the answer reported to the correct number of significant figures?
26.1
The number of significant figures in the measurement 0.000305 kg is?
3
What is the molarity of a 25.0% aqueous isopropyl alcohol solution?
3.27 M
Perform the following calculation, being sure to maintain the appropriate number of significant figures.
3.9 x 10^3
What is the mass number of an atom which is made up of 38 protons, 52 neutrons and 38 electrons?
38
Given the calculation: (7.22 x 10 -3) x (6.4 x 10 7) = ? What is the answer reported to the correct number of significant figures?
4.6 x 10^5
Which of the following energy quantities is equivalent to 11.9 kcal?
49.8 Kj
What is the volume of 62.3g of nitrogen gas at STP
49.8 L
Walking at a brisk pace burns off about 280 Cal/h. How long would you have to walk to burn off the Calories obtained from eating a candy bar that contained 3 g of protein, 12 g of fat, and 28g of carbohydrates?
50 minutes
How many valence electrons are there in an oxygen atom?
6
An oxygen atom has_________ valence electrons and _______ total electrons.
6, 8
A certain automobile has an 18 gallon gas tank. What is the volume of this tank in liters? [1 gallon = 4 quarts, 1 quart = 0.946 liter]
68 Liters
Potassium metal reacts violently when added to water according to the balanced equation: 2 K9s) + 2H20 yields 2 KOH(aq) + H2. How many moles of H20 are needed to react completely with 7.54 mol of K?
7.54 mol of H20
How many moles of sodium chloride (table salt, NaCL, molar mass 58.44g/mol) are contained in a 1.00 lb box of table salt?
7.77 mol of NaCl
Suppose the theoretical yield in a reaction is 10.5 g and the percent yield is 75.5%. What is the actual yield of product obtained?
7.93 g
A sample of gas contains four gases with the following partial pressures: He (113mm Hg), Ne (184 mm Hg) what is the total?
777 mm Hg
Which columns of the periodic table is commonly called the halogens?
7A
How many millimeters of a 5.25% HCI solution
8.3 mL HCI solution
A saline solution used in intravenous drips for patients who cannot take oral fluids contains 0.92% NaCl in water. What volume of the saline solution must be administered to the patient in order to deliver 7.7g of NacL
840 mL of saline solution
Consider the oxidation of sodium metal to sodium oxide described by the balanced equation:4 Na + O2 yields 2NA2O. If 2.55 mol of sodium reacts, and 75.0 g of Na2O is produced, what is the percent yield?
94.9% yield
The molecules A and B react according to the following chemical equation: A + B yields C. Identify the limiting reactant under the reaction conditions shown in the molecular art below
A is the limiting reactant
Which of the following is a true statement about the energy diagram shown below?
A labels the Ea of the reactions and B labels the triangle H of the reaction
Which solution has the highest boiling point?
A solution formed by dissolving 0.75 mol of Na3PO4 in 1.00 kg of water
Which statement concerning the reversible reaction 2 Ho2 N2O4 is true?
AS the forward reaction progresses and more N2O4 is formed, the reverse reaction rate increases
What ionic compound is not soluble in water?
AgCl
Which cylinder at STP will contain the greatest number of gas particles?
All of the cylinders contain the same number of gas particles
Which pair of compounds will form a solution?
Benzene (C6H6) and hexane (C6H14)
Which of the following would increase the solubility of gaseous o2 in water?
Both A and D are correct
Which element is a nonmetal?
Br
Which compound has the lowest boiling point?
C4H10
Which molecule has the lowest surface tension?
C4H10
Which is NOT an ionic compound?
CBr4
Which of the following is not a proper symbol for an element?
CO
The electron configuration of chlorine is 1s22s22p63s23p5. Which statement about chlorine is incorrect?
Chlorine has five electrons in the 3p subshell
Identify the correct classification for the reaction H2O + SO3 yields to H2SO4
Combination
Which of the following contains only transition metals?
Cr, Mo, Ni, Pt
Which of the value (if any) in each pair corresponds to a faster reaction?
Ea= 1kcal
In the balanced redox reaction: 2 Cu(s) + S(s) yields Cu2S(s) how many electrons are gained or lost by each copper atom?
Each copper atom loses one electron
Which term correctly describes a reaction in which the energy of the products is higher than the energy of the reactants?
Endothermic
2 Co(NO3)3 + 3(NH4)2S yields Co2S3 + 3NH4NO3 is a properly balanced chemical equation
False
A 6.10 M NaCl solution is made by adding
False
A gas cylinder containing 3.88 mol of helium has a pressure of 549 mm Hg at 298 K. If 1.22 mol of neon is added to this cylinder, at constant temperature and volume,
False
A mole is a quantity that contains 6.02 x 10-23 atoms, molecules, ions
False
A mole of copper atoms has more atoms than a mole of lead atoms
False
All elements have at least two naturally occurring isotopes.
False
All nonvolatile solute are ionic compounds that do not readily
False
All solids are crystalline solids.
False
An aqueous solution with the label 0.25 M sucrose contains
False
Consider the following reversible reaction at equillibrium: 2 NO + O2 reversible 2NO2. If oxygen gas is added to the reaction vessel, the equilibrium will shift to the left.
False
Consider the reaction: 2 C2H6(g) 7O2 yields 4 CO2 + 6 H2O. Increasing the concentration of C2H6 will decrease the activation energy.
False
Consider the unbalanced chemical equations: NH3 + O2 yields NO + H2O. It requires 55,4 g of NH3 to completely react with 156g of O2
False
Dialysis is a process that involves the selective passage of water, protein molecules, and ions across a semipermeable membrane
False
Dilution is the addition of solute to decrease the concentration of solvent
False
Every atom must have an octet of electrons in order for a Lewis structure to be considered valid.
False
In order to cause an endothermic equillibrium reaction to shift in a direction to form more reactants, the reaction must be heated.
False
In the energy diagram below, the triangle H of the reaction is labeled by D
False
One term in a balanced chemical equation contains the coefficient 4 in front of the formula Mg3(PO4)2. This term represents that there are 12 Mg atoms, 4 P atoms, and 16 O atoms in this term.
False
Phosphorus has 15 valence electrons.
False
Protons and electrons reside in the nucleus of an atom.
False
Reactions with high Ea are generally fast reactions
False
STP is defined as a pressure of exactly one atmosphere and a temperature of 25 degrees celsius
False
The actual yield is the amount of product expected from a given amount of reactant based on the coeffi
False
The balanced reaction: 4 NO2 + O2 + 2H2O yields 4 HNO3 states that four grams of nitrogen dioxide reacts with each gram of oxygen.
False
The correct name for SF6 is sulfur heptafluoride.
False
The density of a sample gas increases if the temperature is increased but the pressure is held constant
False
The equilibrium constant expression for the reversible reaction CHCl3 + 3HCL reversible CH4 +3CL2 is
False
The expression for the equilibrium constant, K for the general reaction: a A + b B reversible
False
The larger of the K for a reaction, the faster the reaction
False
The size of gas particles is a large compared to the space between the particles
False
The solubility of gases increases with increasing temperature
False
When 88.4 g of hydrogen gas is put in a 25.8L container 300 K the pressure will be 83.7 atm.
False
When calculating the concentration of a solution in units of parts per million, the "parts" must
False
When the volume of a sample of gas is doubled and the kelvin temperature is cut in half, the pressure of a sample remains constant
False
Which element has a variable charge?
Fe
Which molecules exhibit hydrogen bonding?
HF
Which of the following statements is true?
Heat is a form of energy, but temperature is not
Which is au alkali metal?
K
The molecular art depicts the following reversible reaction at equilibrium: CO + Cl2 reversible COCl2 what can be interred about the equilibrium constant K, for this reaction?
K>1
Which molecules exhibit London Dispersion forces?
KI, CH4, NH3, Hbr. All of the molecules exhibit London Dispersion forces.
Which element is not an alkali metal?
Kr
Which statement concerning the ion Li+ is correct?
Li+ has two total electrons
Consider the two liquids A and B shown in closed containers. Which liquid has the higher vapor pressure?
Liquid B
When octane evaporates, what kind of attractive forces are overcome?
London dispersion forces between octane and molecules
Which element has the following orbital diagram?
Mg
Which element has the following orbital diagram?
Oxygen
In general, a ________ bond will be one in which the electronegativity difference between two atoms is 0.5 units or greater.
Polar
Write out the name of the following compound: Na2CO3
Sodium Carbonate
A catalytic converter uses a catalyst to catalyze three reactions that clean up the exhaust from an auto engine. Which element is not used as a catalyst in catalytic converters?
Sulfur
A student runs the reaction LiOH + CO2 yields LiHCO3. The reaction consumes 45.0 g LiOH and produces 72.8g of LiHCO3. Which of the statements concerning this reaction is true?
The actual yield of the product is 72.8 g LiHCO3
The conversion factor shown below was obtained from the balanced chemical equation 4 KO2 + 2CO2 yields 2K2CO3 + 3O2. This conversion factor would be used to calculate which of the following?
The amount of KO2 that is required to produce a certain amount of O2
The chemical equation: KCIO2 yields KCI + O2 is not balanced. Balance this equation, then select the statement that best describes the balanced equation.
The balanced equation will have six atoms of oxygen on each side of the equation.
An unknown amount of water is added to 75 mL of a 3.5 M aqueous glucose solution. What can be said about the concentration of the resulting solution?
The concentration of the resultant glucose solution will be less than 3.5 M.
A reversible reaction has reached equilibrium when which condition is established?
The forward and reverse reaction rates become equal
The reversible reaction: Pcl3 +cl2 reversible has K= 0.5. Based on the molecular art shown below, what can be inferred about the reaction conditions?
The reaction has not yet reached equilibrium
One step in the metabolism of glucose is depicted below. Which statement best described how the equilibrium system would
The system would shift to the right, producing more dihydroxyacetone phosphate and glyceraldehyde 3 phosphate
A chemical change alters the chemical composition of a substance, and therefore a new substance is produced
True
A chemical equation is balanced by adding coefficients in front of some formulas
True
A nonvolatile solute makes it harder for solvent molecules to form a
True
A solution can be made less concentrated by adding additional solvent
True
All chemical reactions convert one subtstance into another
True
Bond breaking is endothermic
True
Colligative properties are properties of a solution
True
Consider the balanced reaction: 4 NO2 + O2 + 2H2O yields 4 HNO3. If 100 g of NO2 is placed in a reaction vessel the theoretical yield of nitric acid will be 137g.
True
Consider the following reversible reaction at equillibrium: CO + Cl2 yields COCl2 where triangle H is -108.6 kJ. When the temperature of the reaction vessel decreases, the system responds by forming more COCL2.
True
Consider the reaction: 2 C2H6 + 7O2 yields 4CO2 + 6H2O. Decreasing the concentration of C2H6 will decrease the reaction rate
True
Consider the reversible reaction: CO(g) + Cl2(g) reversible COCl2. The reverse reaction is COCL2 yields CO + CL2
True
Ethylene glycol is more soluble in water than propane
True
In redox reactions, metals tend to undergo oxidation
True
London Dispersion forces are also referred to as van der Waals forces.
True
Polypropylene, a typical plastic, is an example of an amorphous solid
True
The 5s orbital is lower in energy than the 4d orbital.
True
The balanced reaction: 4 Fe + 3O2 yields 2 Fe2O3 is an oxidation-reduction reaction.
True
The balanced reaction: 4 NO2 + O2 + 2H2O yields 4 HNO3 states that four moles of nitrogen dioxide react with each mole of oxygen.
True
The energy required to break up the attractions between ethylene glycol molecules is greater than the energy required to break up
True
The ionic compound (Nh4)2So4 is soluble in water
True
The numerical value of the universal gas constant, R, depends on its units
True
The solubility of Ba(NO3)2 in water is lower at twenty five degrees than at fifty degrees celsius
True
The solubility of KI in water at 20 degree celsius is 140 g KI/100 g H2O. If 160 g of KI is mixed with 150 g of water, all of the KI
True
Viscosity is a measure of the resistance of a liquid to flow freely/
True
Water solubility for neutral molecules occurs only for small polar molecules or those with many O
True
When the equillibrium constant for reversible reaction is much greater than one, the equillibrium is said to lie to the right
True
gases expand to fill the volume and shape of their container because the rapidly moving particles experience negligible attractive forces for each other
True
Which cylinder at STP will contain the greatest mass of gas particles?
a 5.0: cylinder of nitrogran
Ionic bonds form between
a metal and nonmetal
________ are negatively charged ions that have ________ electrons than protons.
anions; more
Identify the element with the ground state electron configuration 1s22s22p63s23p6.
argon, Ar
Which of the following describe a physical change?
boiling water
In bonding, main group elements gain, lose, or share electrons to attain the ________ of the nearest noble gas neighbor to them in the periodic table.
electron configuration
What are the vertical columns of the periodic table called?
families
The neutron got its name because which of the following is true?
it does not have an electrical charge
Density is equal to:
m/v
Which of the following is the correct order of filling orbitals?
none of these
Which of the following correctly describes an electron?
on the scale of subatomic particles it is light and has a -1 charge
Which of the following correctly describes a proton?
on the scale of subatomic particles it is massive and has a +1 charge
In a lewis structure an H atom can have ________bonds.
one
Which subatomic particles are found in the nucleus?
protons and neutrons
The number of valence electrons of a main group element is related to which of the following?
the element's column number
An equillibrium constant with a value of 1.5 x 10 -9 indicates that at equillibrium
the reactants are favored
Increasing the concentration of the reactants in a chemical reaction increases the number of collisions, and the reaction rate increases
true
NaCl has a higher melting point than sucrose
true
The stronger the bond, the higher its bond disassociation energy
true
The stronger the intermolecular forces, the lower the vapor pressure of a substance at a
true
Covalent bonds form between
two nonmentals
The electrons in the outermost shell of an atom are called the ________ electrons.
valence
