What is the heat when 100.0 g of Mg cool from 725 K to 552 K? The heat capacity of Mg is in Table 7.1.
It takes 452 J of heat to raise the temperature of a 36.8 g sample of a metal from 22.9(C to 98.2(C. What is the heat capacity of the metal?
To a 0.444 g sample of H2O, 23.4 J of heat are added. What is its change in temperature? The heat capacity of H2O is in Table 7.1.
What is the work when a gas expands from 0.666 L to 2.334 L against an external pressure of 2.07 atm?
What is the heat when 55.6 g of Fe increase temperature from 25.6(C to 177.9(C? The heat capacity of Fe is in Table 7.1.
In a 600 mL solution, 0.50 mol of Ca(OH)2(aq) and 0.50 mol of H2SO4(aq) are combined. The temperature of the solution increases by 22.3(C. What is the heat of the reaction, and what is the H of the...
To warm 100.0 g of H2O, 0.066 mol beeswax is burned. The water warms from 21.4(C to 25.5(C. What is the heat of the reaction, and what is the H of the reaction on a molar basis?
NaHCO3 decomposes when exposed to heat: 2NaHCO3(s) ( Na2CO3(s) + CO2(g) + H2O() H = 91.5 kJ What mass of NaHCO3 is decomposed by 256 kJ?
HgO decomposes when exposed to heat: 2HgO(s) ( 2Hg() + O2(g)H = 181.6 kJ What mass of O2 can be made with 100.0 kJ?
For the thermochemical equation Fe2O3(s) + 3SO3(g) ( Fe2(SO4)3(s)H = 570.2 kJ What mass of SO3 is needed to generate 1,566 kJ?
Given the thermochemical equation 2CO2(g) ( 2CO(g) + O2(g)H = 566 kJ how much energy is absorbed when 85.2 g of CO2 are reacted?
Determine H for the reaction 2CH4 ( 2H2 + C2H4 Given these data: CH4 + 2O2 ( CO2 + 2H2O H = 891 kJ C2H4 + 3O2 ( 2CO2 + 2H2O H = 1,411 kJ 2H2 + O2 ( 2H2O H = 571 kJ
Determine H for the reaction CaCO3 ( CaO + CO2 given these data: 2Ca + 2C + 3O2 ( 2CaCO3 H = 2,414 kJ C + O2 ( CO2 H = 393.5 kJ 2Ca + O2 ( 2CaO H = 1,270 kJ
If the H for 2C2H6 + 7O2 ( 4CO2 + 6H2O Is 2,650 kJ, what is the H for this reaction? 6C2H6 + 21O2 ( 12CO2 + 18H2O
The H for N2 + O2 ( 2NO Is 181 kJ. What is the H for this reaction? NO ( 1/2N2 + 1/2O2
Write a proper formation reaction for each substance. a. O3(g) b. Na2O2(s) c. PCl5(g)
Determine the enthalpy change of this reaction. Data can be found in Table 7.2. 2AgBr(s) + Cl2(g) ( 2AgCl(s) + Br2()
Determine the enthalpy change of this reaction. Data can be found in Table 7.2. 2C6H6() + 15O2(g) ( 12CO2(g) + 6H2O()
Write a proper formation reaction for each substance. a. N2O5(g) b. BaSO4(s) c. Fe(OH)3(s)
Is the enthalpy change of the reaction H2O() ( H2O(g) zero or nonzero? Use data in Table 7.2 to determine the answer.
What is the H for this reaction? The label gra means graphite, and the label dia means diamond. What does your answer mean? C(s, gra) ( C(s, dia)
A 457 mL volume of gas contracts when 773 torr of external pressure act on it. If 27.4 J of work are added to the gas, what is its final volume?
What is final temperature when a 45.6 g sample of Al at 87.3(C gains 188 J of heat?
What is the wavelength of light if its frequency is 1.55 1010 s1?
What is the electron configuration for Mg, which has 12 electrons?
What is the wavelength of light if its frequency is 8.19 1014 s1?
What is the wavelength of light if its frequency is 3.66 106 s1?
Write the complete electron configuration for each atom. a. Cs, 55 electrons b. Ar, 18 electrons
How many subshells are completely filled with electrons for Mg? How many subshells are unfilled?
What is the maximum number of electrons in the entire n = 4 shell?
Write the complete electron configuration for each atom. a. Br, 35 electrons b. Be, 4 electrons
From the elements position on the periodic table, predict the electron configuration of each atom. a. Fe b. Ba
From the elements position on the periodic table, predict the electron configuration of each atom. a. Mg b. I
What are the valence shell electron configurations of the elements in the next-to-last column of the periodic table?
Which atom has a smaller radius, As or Cl?
What is the energy of a photon if its frequency is 1.00 s1?
Draw the Lewis electron dot diagram for each element. a. Strontium b. Silicon
Draw the Lewis electron dot diagram for each element. a. Bromine b. Gallium
How many electrons does a Pb atom have to lose to have a complete octet in its valence shell?
How do you know which side of a polar bond has the partial negative charge? Identify the negatively charged side of each polar bond. a. HCl b. HS
Label the bond between the given atoms as nonpolar covalent, slightly polar covalent, definitely polar covalent, or likely ionic. a. S and Cl b. P and O c. Cs and O
Draw an acceptable Lewis electron dot diagram for these molecules that violate the octet rule. a. NO2 b. XeF4
Use bond energies to estimate the energy change of this reaction. C3H8 + 5O2 ( 3CO2 + 4H2O
Ethylene (C2H4) has two central atoms. Determine the geometry around each central atom and the shape of the overall molecule.
Hydrogen peroxide (H2O2) has two central atoms. Determine the geometry around each central atom and the shape of the overall molecule.
Identify the strongest intermolecular force present in each substance. a. CH3OH b. (CH3)2CO c. N2
Predict the type of solid exhibited by each substance. a. SO3 b. Br2 c. Na2SO3
How many grams of solid water can be melted with 1.55 kJ of energy?
How many grams of Hg can be vaporized using 29,330 J of energy?
Using concentration as a conversion factor, how many liters of 0.0444 M CH2O are needed to obtain 0.0773 mol of CH2O?
What mass of solute is present in 1.08 L of 0.0578 M H2SO4?
What volume of 0.512 M NaOH will react with 17.9 g of H2C2O4(s) according to the following chemical equation? H2C2O4(s) + 2NaOH(aq) ( Na2C2O4(aq) + 2H2O()
A student titrates 25.00 mL of H3PO4 with 0.0987 M KOH. She uses 54.06 mL to complete the chemical reaction. What is the concentration of H3PO4? H3PO4(aq) + 3KOH(aq) ( K3PO4(aq) + 3H2O
Determine the boiling point of a 0.887 m solution of CaCl2 in H2O.
If there is 0.551 mg of As in 348 g of solution, what is the As concentration in ppm?
What is the molarity of a solution made by dissolving 13.4 g of NaNO3 in 345 mL of solution?
What is the molarity of a solution made by dissolving 332 g of C6H12O6 in 4.66 L of solution?
How many moles of NH4Br are present in 88.9 mL of a 0.228 M solution?
What volume of 0.333 M Al(NO3)3 is needed to obtain 26.7 g of Al(NO3)3?
A 0.664 M solution of NaCl has an initial volume of 2.55 L. What is the final concentration of the solution if it is diluted to 3.88 L?
What volume of 0.905 M H2SO4 will react with 26.7 mL of 0.554 M NaOH? H2SO4 + 2NaOH ( Na2SO4 + 2H2O
What volume of 1.000 M Na2CO3 will react with 342 mL of 0.733 M H3PO4? 3Na2CO3 + 2H3PO4 ( 2Na3PO4 + 3H2O + 3CO2
It takes 23.77 mL of 0.1505 M HCl to titrate with 15.00 mL of Ca(OH)2. What is the concentration of Ca(OH)2? You will need to write the balanced chemical equation first.
It takes 97.62 mL of 0.0546 M NaOH to titrate a 25.00 mL sample of H2SO4. What is the concentration of H2SO4? You will need to write the balanced chemical equation first.
If 123 g of C10H16O are dissolved in 355 g of C6H6, what is the boiling point of this solution?
If 1 mol of solid CBr4 is mixed with 2 mol of CCl4, what is the boiling point of this solution?
A solution of C2H2O4 in CH3COOH has a boiling point of 123.40C. What is the molality of the solution?
C8H17OH is a nonvolatile solid that dissolves in C6H12. If 7.22 g of C8H17OH is dissolved in 45.3 g of C6H12, what is the freezing point of this solution?
A solution of C2H2O4 in CH3COOH has a freezing point of 10.00C. What is the molality of the solution?
If 25.0 g of C6H12O6 are dissolved in H2O to make 0.100 L of solution, what is the osmotic pressure of this solution at 25C?
If 2.33 g of C27H46O are dissolved in liquid CS2 to make 50.00 mL of solution, what is the osmotic pressure of this solution at 298 K?
The osmotic pressure of blood is about 7.65 atm at 37C. What is the approximate concentration of dissolved solutes in blood?
Many labs use a cleaning solution of KOH dissolved in C2H5OH. If 34.7 g of KOH were dissolved in 88.0 g of C2H5OH, what is the boiling point of this solution? The normal boiling point of C2H5OH is...
What is the freezing point of a solution made by dissolving 345 g of CaCl2 in 1,550 g of H2O? Assume an ideal van't Hoff factor.
A classic homemade ice cream can be made by freezing the ice cream mixture using a solution of 250 g of NaCl dissolved in 1.25 kg of ice water. What is the temperature of this ice water? Assume an...
Seawater can be approximated as a 3.5% NaCl solution by mass; that is, 3.5 g of NaCl are combined with 96.5 g H2O. What is the osmotic pressure of seawater? Assume an ideal van't Hoff factor.
The osmotic pressure of blood is 7.65 atm at 37C. If blood were considered a solution of NaCl, what is the concentration of NaCl in blood? Assume an ideal van't Hoff factor.
Given its notoriety, you might think that uranium is very rare, but it is present at about 24 ppm of the earths crust, which is more abundant than silver or mercury. If the earths crust is estimated...
What volume of 0.225 M Ca(OH)2 solution is needed to deliver 100.0 g of Ca(OH)2?
Write the balanced chemical equation for the neutralization reaction between HCl and Fe(OH)3. What is the salt?
If a solution has a pH of 0.77, what is its pOH, [H+], and [OH]?
The synthesis of CaCO3 uses this chemical reaction. CaO(s) + CO2 (g) + CaCO3(s) + 180 kJ Identify three stresses that can be imposed on the equilibrium to maximize the amount of CaCO3.
What are the pH and the pOH of a saturated solution of Fe(OH)3? The Ksp of Fe(OH)3 is 2.8 1039.
Name this molecule. C C- C-
Name this molecule. C C - C-C- - - C C C CICI CIC
Name this molecule. FC-C-C
Draw the carbon backbone of all noncyclic alkanes with only four C atoms.
With four monomers, draw two possible structures of a copolymer composed of ethylene and propylene.
With four monomers, draw two possible structures of a copolymer composed of ethylene and styrene.
Polyunsaturated alkenes have more than one CC double bond. Draw the carbon backbone of all possible noncyclic polyunsaturated alkenes with four C atoms and two double bonds. What are the complete...
A student gently drops an object weighing 15.8 g into an open vessel that is full of ethanol, so that a volume of ethanol spills out equal to the volume of the object. The experimenter now finds that...
You have two identical boxes with interior dimensions of 8.0 cm 8.0 cm 8.0 cm. You completely fill one of the boxes with wooden spheres that are 1.6 cm in diameter. The other box gets filled with...
You are teaching a class of second graders some chemistry, and they are confused about an objects mass versus its density. Keeping in mind that most second graders dont understand fractions, how...
Describe atomic theory and discuss how it explains the great variety of different substances. How does it explain chemical reactions?
What is the difference between a molecular formula and a structural formula?
For the balanced chemical equation Pb(NO3)2 + K2CO3 PbCO3 + 2KNO3, how many oxygen atoms are on the left side?
New industrial plants for acetic acid react liquid methanol with carbon monoxide in the presence of a catalyst. CH3OH(l) + CO(g) HC2H3O2(l) In an experiment, 15.0 g of methanol and 10.0 g of carbon...
A 3.87-mg sample of ascorbic acid (vitamin C) gives 5.80 mg CO2 and 1.58 mg H2O on combustion. What is the percentage composition of this compound (the mass percentage of each element)? Ascorbic acid...
Zinc metal can be obtained from zinc oxide, ZnO, by reaction at high temperature with carbon monoxide, CO. ZnO(s) + CO(g) Zn(s) + CO2(g) The carbon monoxide is obtained from carbon. 2C(s) + O2(g) ...
Calculate the mass (in grams) of each of the following species. a. Na atom b. N atom c. CH3Cl molecule d. Hg(NO3)2 formula unit