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chemistry principles and practice

Questions and Answers of Chemistry Principles And Practice

A 0.3120-g sample of a soluble compound made up of aluminum and chlorine yields 1.006 g AgCl when mixed with enough AgNO3 to react completely with all of the chloride ions. What is the empirical
A 2.64-g sample of Ba(OH)2 is dissolved in water to form 250.0 mL solution. Th is solution is titrated with 0.0554 M H2SO4. It takes 33.4 mL of the acid solution to neutralize 30.0 mL of the base
An aqueous solution of hydrazine, N2H4, can be prepared by the reaction of ammonia and sodium hypochlorite.What is the theoretical yield of hydrazine, in grams, prepared from the reaction of 50.0 mL
Tin(II) fluoride (stannous fluoride) is added to toothpaste as a convenient source of fluoride ion, which is known to help minimize tooth decay. The concentration of stannous fluoride in a particular
What is the percentage of barium in an unknown if a 2.3-g sample of the compound dissolved in water produces 2.2 g barium sulfate on addition of an excess of sodium sulfate?
Most photographic films, both colored and black and white, contain silver compounds. Some of the silver is left in the film as part of the image, but much of it dissolves as Ag+(aq) ions in solution
When heated, potassium chlorate, KClO3, melts and decomposes to potassium chloride and diatomic oxygen.(a) What is the theoretical yield of O2 from 3.75 g KClO3?(b) If 1.05 g of O2 is obtained, what
The Ostwald process is used to make nitric acid from ammonia. The first step of the process is the oxidation of ammonia as pictured below:In an experiment, 50.0 g of each reactant is sealed in a
Balance the following reaction.StrategyChoose the most complicated species and balance the elements in it on the other side of the arrow. Then adjust the coefficients of the other species in the
Write a balanced equation for the reaction pictured below. In the diagrams, the red spheres represent oxygen atoms and blue spheres represent nitrogen atoms.StrategyExamine the diagram to determine
Th e reaction of sodium metal with water produces hydrogen gas and sodium hydroxide, which is soluble in the excess water used in the reaction. Write the balanced chemical equation for this reaction,
Write the equations for hydrogen chloride gas dissolving in water.StrategyHCl(g) forms H+(aq) and Cl-(aq) when it dissolves in water.
Write the balanced chemical equation for the reaction of aqueous nitric acid with solid magnesium hydroxide.StrategyThis reaction is an acid–base reaction making the products water and the
Write the equation for the combustion of liquid ethanol, also called ethyl alcohol, C2H5OH.StrategyThe combustion of an organic compound such as ethanol produces CO2 and H2O. In balancing this
Lead(II) oxide can be converted to metallic lead by reaction with carbon monoxide. The other product of the reaction is carbon dioxide.(a) Write the balanced equation for this reaction.(b) Assign
(a) How many atoms are present in 0.11 mol argon (symbol Ar)?(b) How many moles are present in 2.67 × 1023 molecules of N2H4? Strategy In both parts, the unit conversions come from the definition of
Ethylene, C2H4, is used in such diverse applications as the ripening of tomatoes and the preparation of plastics.(a) Calculate the molar mass of ethylene.(b) Calculate the mass of 3.22 mol
How many moles are present in 14.2 g hydrazine, N2H4?StrategyUse the molar mass of N2H4 as the conversion factor for the conversion of grams N2H4 into moles N2H4.
Aspirin is a remarkable analgesic (painkiller) that also appears to prevent certain heart conditions. From its chemical formula, C9H8O4, calculate the percentage by mass of each element in
Shown in the margin is one molecule of methylamine; the NH2 group is an example of an amine functional group, a group present in many important chemicals. Write the formula of methylamine and use it
A chemist uses the apparatus shown in Figure 3.4 to determine the composition of a compound made up of only carbon, hydrogen, and oxygen. During combustion of a 0.1000-g sample , the mass of the
Analysis of a 0.330-g sample of a compound shows that it contains 0.226 g chromium and 0.104 g oxygen. What is the empirical formula?StrategyThe strategy is outlined in the following diagram.The mass
Calculate the empirical formula of a compound extracted from tobacco. Chemical analysis shows that this substance contains 74.0% carbon , 8.70% hydrogen , and 17.3% nitrogen.StrategyThe empirical
Given the following equation, answer the questions that follow.(a) What mass of O2 will react with 4.10 g PbS?(b) What is the theoretical yield of PbO?StrategyThe same series of steps used in Example
Earlier, the reaction of NaClO3(s) shown below was presented as a portable source of oxygen that is similar to the chemistry used as a backup source for oxygen on the space station. If this reaction
Phosphorus trichloride reacts with oxygen to yield POCl3. In an experiment performed in the laboratory, 11.0 g PCl3 and 1.34 g O2 are mixed, and 11.2 g POCl3 is isolated. What is the percent
Name the compound pictured below. CH3CH₂CHCH₂CH₂CH₂CH₂CH3 CH3
Name the two compounds pictured below.StrategyLocate the longest chain or biggest ring. Locate any substituents and number the chain to minimize the number of the substituent. Name the substituent,
Sulfur dioxide, SO2, is a molecular compound that contributes to acid rain, and CaCO3 is an ionic compound that can neutralize acid rain. Explain the difference in the meanings of these two formulas.
The names of acids formed from oxygen containing polyatomic anions are related to the name of the anion. How are the names of the anions modified to obtain the names of the acids?
Does the name nitrogen oxide correctly apply to the compound NO? Explain why or why not.
What is missing from the name chromium chloride for the compound CrCl3?
Describe the types of elements that generally combine to form ionic compounds and the types that combine to form molecular compounds.
How do the properties of ionic compounds differ from those of molecular compounds?
Explain why most ionic compounds are hard solids at room temperature, whereas most small molecular substances, such as H2O and O2, are liquids or gases.
A chemist received a white crystalline solid to identify. When she heated the solid to 350 °C, it did not melt. The solid dissolved in water to give a solution that conducted electricity. Based on
NaCl is said to dissociate in water. Draw a picture of this process.
Explain on an atomic level why molten ionic compounds conduct electricity, whereas molten molecular compounds do not.
Define group and period.
Give the complete symbol including atomic number and mass number, of(a) A chlorine atom with 20 neutrons, and(b) A calcium atom with 20 neutrons. (4X),
Name and give the symbols for two elements that(a) Are metals.(b) Are nonmetals.(c) Are metalloids.(d) Consist of diatomic molecules.
Give the complete symbol , including atomic number and mass number, of(a) A nickel atom with 31 neutrons, and(b) A tungsten atom with 110 neutrons. (4X),
Write the symbol that describes each of the following isotopes.(a) An atom that contains 7 protons and 8 neutrons(b) An atom that contains 31 protons and 39 neutrons(c) An atom that contains 18
Write the symbol that describes each of the following isotopes.(a) An atom that contains 5 protons and 6 neutrons(b) An atom that contains 25 protons and 30 neutrons(c) An atom that contains 14
Give the numbers of protons and neutrons in (a) As 79 33 (b) V 51 23 (c) ¹22 Te 52
Give the numbers of protons and neutrons in (a) S 16 (b) Mg 37 (c) C1 17
Write the atomic symbol for the element whose monatomic ion has a 2 + charge, has 14 more neutrons than electrons, and has a mass number of 88.
Write the atomic symbol for the element whose monatomic ion has a 2- charge, has 20 more neutrons than electrons, and has a mass number of 126.
Write the symbol for the ion with(a) 8 protons, 10 electrons, and 8 neutrons.(b) 34 protons, 36 electrons, and 45 neutrons.(c) 28 protons, 26 electrons, and 31 neutrons.
Write the symbol for the ion with(a) 4 protons, 2 electrons, and 5 neutrons.(b) 32 protons, 30 electrons, and 40 neutrons.(c) 35 protons, 36 electrons, and 44 neutrons.
Write the symbol for the atom or ion of the species that contains(a) 12 protons, 13 neutrons, and 10 electrons.(b) 13 protons, 14 neutrons, and 10 electrons.(c) 14 protons, 15 neutrons, and 14
Given the partial information in each column of the following table, fill in the blanks. Symbol Atomic number Mass number Charge Number of protons Number of electrons Number of
Write the symbol for the atom or ion of the species that contains(a) 23 protons, 28 neutrons, and 20 electrons.(b) 53 protons, 74 neutrons, and 54 electrons.(c) 44 protons, 58 neutrons, and 41
Complete the table below. If necessary, use the periodic table. Symbol Charge 0 0 3+ 31p - Number of Protons 9 27 16 Number of Neutrons 10 16 30 16 Number of Electrons 1 18
Data obtained with a mass spectrometer show that, in a sample of an element, 60.11% of the atoms have masses of 68.926 u, whereas the remaining 39.89% of the atoms have masses of 70.926 u. Calculate
An element has two isotopes with masses of 62.9396 u and 64.9278 u, and 30.83% of the atoms are the heavier isotope. Calculate the atomic mass of this element and give its name and symbol.
Naturally occurring rubidium is 72.17% 85Rb (atomic mass = 84.912 u). Th e remaining atoms are 87Rb (atomic mass = 86.909 u). Calculate the atomic mass of Rb.
Naturally occurring indium is 95.7% 115In (atomic mass = 114.904 u). Th e remaining atoms are 113In (atomic mass = 112.904 u). Calculate the atomic mass of In.
The mass spectrum of an element shows that 78.99% of the atoms have a mass of 23.985 u, 10.00% have a mass of 24.986 u, and the remaining 11.01% have a mass of 25.982 u.(a) Calculate the atomic mass
The most intense peak in a mass spectrum is assigned a height of 100 units. The following spectrum was obtained from a sample of an element. Use the data to calculate the atomic mass of the element.
The mass spectrum of an element shows that 92.2% of the atoms have a mass of 27.977 u, 4.67% have a mass of 28.976 u, and the remaining 3.10% have a mass of 29.974 u.(a) Calculate the atomic mass of
The most intense peak in a mass spectrum is assigned a height of 100 units. The following spectrum was obtained from a sample of an element. Use the data to calculate the atomic mass of the element.
Antimony occurs naturally as two isotopes, one with a mass of 120.904 u and the other with a mass of 122.904 u.(a) Give the symbol that identifies each of these isotopes of antimony.(b) Get the
Bromine occurs naturally as two isotopes, one with a mass of 78.918 u and the other with a mass of 80.916 u.(a) Give the symbol that identifies each of these isotopes of bromine.(b) Get the atomic
Give a name and symbol for an element in the fifth period that is in the same group with(a) Sodium.(b) Fe.(c) Bromine.(d) Ne.
Give a name and symbol for an element in the sixth period that is in the same group with(a) Ge.(b) magnesium.(c) Y.(d) arsenic.
Give a name and symbol for an element that is in the same group with(a) Ti.(b) Oxygen.(c) Fluorine.(d) Ba.
Give a name and symbol for an element that is in the same group with(a) Argon.(b) N.(c) Os.(d) Tungsten.
Identify each of the following elements as a representative, a transition, or an inner transition element from its position in the periodic table.(a) Silicon(b) Cr(c) Magnesium(d) Np
Identify each of the following elements as a representative, a transition, or an inner transition element from its position in the periodic table.(a) Barium(b) Mo(c) F(d) Hafnium
Identify each of the following elements as a representative, a transition, or an inner transition element from its position in the periodic table.(a) Xe(b) Iron(c) K(d) Europium
Identify each of the following elements as a representative, a transition, or an inner transition element from its position in the periodic table.(a) Br(b) Platinum(c) Rubidium(d) U
Give the symbol and name for(a) The alkali metal in the same period as chlorine.(b) A halogen in the same period as magnesium.(c) The heaviest alkaline earth metal.(d) A noble gas in the same period
Give the symbol and name for(a) The alkaline earth element in the same period as sulfur.(b) A noble gas in the same period as potassium.(c) The heaviest alkali metal.(d) A halogen in the same period
How many elements are in each of the following?(a) The alkali metals(b) The halogens(c) The lanthanides(d) The sixth period(e) Group 2B
How many elements are there in Group 4A of the periodic table? Give the name and symbol of each of these elements. Tell whether each is a metal, nonmetal, or metalloid.
Which two elements would you expect to exhibit the greatest similarity in physical and chemical properties:Na, Kr, P, Ra, Sr, Te? Explain your choice.
Which two elements would you expect to exhibit the greatest similarity in physical and chemical properties:B, C, Hf, Pb, Pr, Sn? Explain your choice.
Write the molecular formula of the molecules pictured below. Hydrogen (a) Nitrogen Sulfur (b) Oxygen
Which two elements would you expect to exhibit the greatest similarity in physical and chemical properties:H, Cl, I, Te, W, U? Explain your choice.
Write the molecular formula of the molecules pictured below. Hydrogen Chlorine Carbon Phosphorous (a) (b)
Draw a ball-and-stick picture of SF2 (sulfur is located between the two fluorine atoms).
Draw a ball-and-stick picture of SO2 (sulfur is located between the two oxygen atoms).
Calculate the molecular mass of each of the following molecules.(a) C4H6O(b) NOCl2(c) N2O3
Calculate the molecular mass of each of the following molecules.(a) P4O10(b) C6H7N(c) H3PO4
Aspartame is an artificial sweetener that has the formula C14H18N2O5. What is the molecular mass of aspartame?
The compound B10H14 has an unusual structure, with some of the hydrogen atoms bridging between two of the boron atoms. What is the molecular mass of B10H14?
Write the symbol for the monatomic ion that is expected for each of the following elements.(a) Iodine(b) Magnesium(c) Oxygen(d) Sodium
Write the symbol for the monatomic ion that is expected for each of the following elements.(a) Potassium(b) Bromine(c) Barium(d) Sulfur
What is the empirical formula for the compound made from each of the following pairs of ions?(a) Ca2+ and S2-(b) Mg2+ and N3-(c) Fe2+ and F-
What is the empirical formula for the compound made from each of the following pairs of ions?(a) Li+ and I-(b) Cs+ and O2-(c) Y3+ and Cl-
Write the empirical formula for the ionic compound made from each of the following pairs of elements.(a) Calcium and chlorine(b) Rubidium and sulfur(c) Lithium and nitrogen(d) Yttrium and selenium
Write the empirical formula for the ionic compound made from each of the following pairs of elements.(a) Magnesium and fluorine(b) Sodium and oxygen(c) Scandium and selenium(d) Barium and nitrogen
Write the formula and charge of(a) The hydroxide ion.(b) The chlorate ion.(c) The permanganate ion.
Write the formula and charge of(a) The chromate ion.(b) The carbonate ion.(c) The sulfate ion.
Write the formula and charge of(a) The hydrogen sulfate ion.(b) The cyanide ion.(c) The dihydrogen phosphate ion.
Write the formula and charge of(a) The perchlorate ion.(b) The sulfite ion.(c) The hydrogen carbonate ion.
Write the formula of(a) Magnesium nitrite.(b) Lithium phosphate.(c) Barium cyanide.(d) Ammonium sulfate.
Write the formula of(a) Sodium nitrate.(b) Beryllium hydroxide.(c) Ammonium acetate.(d) Potassium sulfite.
Write the formula of(a) Strontium nitrate.(b) Sodium dihydrogen phosphate.(c) Potassium perchlorate.(d) Lithium hydrogen sulfate.

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