All Matches

Solution Library

Expert Answer

Textbooks

Search Textbook questions, tutors and Books

Oops, something went wrong!

Change your search query and then try again

Result Not Found

Books FREE
Tutors
Study Help
Hire a Tutor
AI Study Help New

Search
Sign In
Register

study help
chemistry
organic chemistry

Questions and Answers of Organic Chemistry

a. Shown here are several potential Lewis electron-dot formulas for the SeO2 molecule.Are there any electron-dot formulas that you expect to give the best description? How would you describe the
Match the following molecular substances with one of the molecular models (i) to (iv) that correctly depicts the geometry of the corresponding molecule.a. SeO2b. BeCl2c. PBr3d. BCl3
Which of the following molecular models correctly depicts the geometry of ClCN?
Suppose that an ethane molecule, CH3CH3, is broken into two CH3 molecules in such a way that one :CH3 molecule retains the electron pair that was originally the one making up the C–C bond. The
Suppose that a BF3 molecule approaches the lone pair on the N atom of an :NH3 molecule, and that a bond forms between the B atom and the N atom. Consider the arrangement of electron pairs about the B
Indicate what hybrid orbital depicted below is expected for the central atom of each of the following:a. BeF2b. SiF4c. SeF4d. RnF4
An atom in a molecule has two bonds to other atoms and one lone pair. What kind of hybrid orbitals do you expect for this atom? Describe how you arrived at your answer.
Two compounds have the same molecular formula, C2H2Br2. One has a dipole moment; the other does not. Both compounds react with bromine, Br2, to produce the same compound. This reaction is a generally
A neutral molecule is identified as a tetrafluoride, XF4, where X is an unknown atom. If the molecule has a dipole moment of 0.63 D, can you give some possibilities for the identity of X?
Acetic acid, the sour constituent of vinegar, has the following structure:Indicate what geometry given below is expected to be found about each of the atoms labeled a, b, and c.
What are the bond angles predicted by the VSEPR model about the carbon atom in the formate ion, HCO2? Considering that the bonds to this atom are not identical, would you expect the experimental
Predict the shape or geometry of the following molecules, using the VSEPR model. a. SiF4 b. SF2 c. COF2 d. PCl3
Use the electron-pair repulsion model to predict the geometry of the following molecules: a. GeCl2 b. NF3 c. SCl2 d. XeO4
Predict the geometry of the following ions, using the electron-pair repulsion model. a. ClO3 b. PO43 c. SCN d. H3O+
Use the VSEPR model to predict the geometry of the following ions: a. N3 b. BH4 c. SO32 d. NO2
For each of the following molecules, state the bond angle (or bond angles, as appropriate) that you would expect to see on the central atom based on the simple VSEPR model. Would you expect the
For each of the following molecules, state the bond angle (or bond angles, as appropriate) that you would expect to see on the central atom based on the simple VSEPR model. Would you expect the
What geometry is expected for the following molecules, according to the VSEPR model? a. PF5 b. BrF3 c. BrF5 d. SCl4
The heat of vaporization of ammonia is 23.4 kJ/mol. How much heat is required to vaporize 1.00 kg of ammonia? How many grams of water at 0°C could be frozen to ice at 0°C by the evaporation of this
Figure 11.35 shows solid dots (€œatoms€) forming a two-dimensional lattice. A unit cell is marked off by the black line. How many €œatoms€ are there in this
Lithium metal has a body-centered cubic structure with all atoms at the lattice points and a unit-cell length of 350.9 pm. Calculate Avogadro’s number. The density of lithium is 0.534 g/cm3.
Potassium metal has a body-centered cubic structure with all atoms at the lattice points. The density of the metal is 0.856 g/cm3. Calculate the edge length of a unit cell.
Carbon disulfide, CS2, has a normal boiling point of 46°C and a heat of vaporization of 26.8 kJ/mol. What is the vapor pressure of carbon disulfide at 35°C?
Selenium tetrafluoride, SeF4, is a colorless liquid. It has a vapor pressure of 757 mmHg at 105°C and 522 mmHg at 95°C. What is the heat of vaporization of selenium tetrafluoride?
List the different intermolecular forces you would expect for each of the following compounds:a. Propanol, CH3CH2CH2OHb. (See model below)c. Sulfur dioxide, SO2
Arrange the following hydrocarbons in order of increasing vapor pressure: ethane, C2H6; propane, C3H8; and butane, C4H10. Explain your answer.
At the same temperature, methyl chloride, CH3Cl, has a vapor pressure of 1490 mmHg, and ethanol has a vapor pressure of 42 mmHg. Explain why you might expect methyl chloride to have a higher vapor
Classify each of the following solids according to the forces of attraction that exist between the structural units:a. Zinc, Zn;b. Sodium iodide, NaI;c. Silicon carbide, SiC;d. Methane, CH4.
Decide what type of solid is formed for each of the following substances: C2H5OH, CH4, CH3Cl, MgSO4. On the basis of the type of solid and the expected magnitude of intermolecular forces (for
Shown here is a representation of a closed container in which you have just placed 10 L of H2O. In our experiment, we are going to call this starting point in time t = 0 and assume that all of the
When camping at high altitude, you need to pay particular attention to changes in cooking times for foods that are boiled in water. If you like eggs that are boiled for 10 minutes near sea level,
A common misconception is that the following chemical reaction occurs when water is boiled:2H2O(l) → 2H2(g) + O2(g)instead ofH2O(l) → H2O(g)a. What evidence do you have that the second reaction
Shown here is a representation of a unit cell for a crystal. The orange balls are atom A, and the grey balls are atom B.a. What is the chemical formula of the compound that has this unit cell
List the different phase transitions that are possible and give examples of each.
Why does the vapor pressure of a liquid depend on the intermolecular forces?
The vapor pressure of water is 17.5 mmHg at 20.0°C and 355.1 mmHg at 80.0°C. Calculate the boiling point of water at 760.0 mmHg.
Describe the behavior of carbon dioxide gas when compressed at the following temperatures: a. 20°C b. –70°C c. 40°C The triple point of carbon dioxide is 57°C and 5.1 atm, and the critical
Describe the behavior of iodine vapor when cooled at the following pressures: a. 120 atm b. 1 atm c. 50 mmHg The triple point of iodine is 114°C and 90.1 mmHg, and the critical point is 512°C and
Describe the formation of hydrogen bonds in propanol, CH3CH2CH2OH. Represent possible hydrogen bonding structures in propanol by using structural formulas and the conventional notation for a hydrogen
Describe the formation of hydrogen bonds in hydrogen peroxide, H2O2. Represent possible hydrogen bonding structures in hydrogen peroxide by using structural formulas and the conventional notation for
Ethylene glycol (CH2OHCH2OH) is a slightly viscous liquid that boils at 198°C. Pentane (C5H12), which has approximately the same molecular weight as ethylene glycol, is a non-viscous liquid that
Decide which substance in each of the following pairs has the lower melting point. Explain how you made each choice.a. Potassium chloride, KCl; or calcium oxide, CaOb. Carbon tetrachloride,or
Explain the surface tension of a liquid in molecular terms. How does the surface tension make a liquid act as though it had a “skin”?
Decide which substance in each of the following pairs has the lower melting point. Explain how you made each choice.a. Magnesium oxide, MgO; or hexane, C6H14b. 1-propanol,or ethylene glycol,c.
Iridium metal, Ir, crystallizes in a face-centered cubic (close-packed) structure. The edge length of the unit cell was found by x-ray diffraction to be 383.9 pm. The density of iridium is 22.42
The edge length of the unit cell of tantalum metal, Ta, is 330.6 pm; the unit cell is body centered cubic (one atom at each lattice point). Tantalum has a density of 16.69 g/cm3. What is the mass of
Use your answer to Problem 11.87 to calculate the radius of the copper atom. Assume that copper atoms are spheres. Then note that the spheres on any face of a unit cell touch along the diagonal.
Rubidium metal has a body-centered cubic structure (with one atom at each lattice point). The density of the metal is 1.532 g/cm3. From this information and the atomic mass, calculate the edge length
Calculate the percent of volume that is actually occupied by spheres in a body-centered cubic lattice of identical spheres. You can do this by first relating the radius of a sphere, r, to the length
Calculate the percent of volume that is actually occupied by spheres in a face-centered cubic lattice of identical spheres. You can do this by first relating the radius of a sphere, r, to the length
For the hydrogen halides and the noble gases, we have the following boiling points: Halogen Family, °C Noble Gases, °C HF, 19 ……………………....... Ne, 246 HCl, 115
For the carbon and nitrogen family hydrides, we have the following boiling points:Carbon Family, °C Nitrogen Family, °CCH4, 164 ………………………NH3, 33SiH4, 112
Account for the following observations:a. Both diamond and silicon carbide are very hard, whereas graphite is both soft and slippery.b. Carbon dioxide is a gas, whereas silicon dioxide is a
Explain the origin of the London force that exists between two molecules.
Greater variation exists between the properties of the first and second members of a family in the periodic table than between other members. Discuss this observation for the oxygen family using the
Use chemical principles to discuss the following observations:a. CO2 sublimes at –78°C, whereas SiO2 boils at 2200°C.b. HF boils at 19°C, whereas HCl boils at –85°C.c. CF4 boils at –128°C,
a. Draw Lewis structures of each of the following compounds: LiH, NH3, CH4, CO2. b. Which of these has the highest boiling point? Why? c. Which of these has the lowest boiling point? Why? d. Which of
Describe the contents of a carbon dioxide fire extinguisher at 20°C. Then describe it at 35°C. Explain the difference.
Discuss why supercritical carbon dioxide is a nearly ideal solvent.
A gecko’s toes have been shown to stick to walls through van der Waals forces. Van der Waals forces also exist between your finger and a wall. Why, then, doesn’t your finger stick to the wall in
Although a gecko’s toes stick easily to a wall, their toes lift off a surface just as easily. Explain.
Describe the structure of a nematic liquid crystal. How is it similar to a liquid? How is it similar to a crystalline solid?
What properties of nematic liquid crystals are employed in LCD displays?
Briefly describe what it is that the Bragg equation relates?
Explain what is meant by hydrogen bonding. Describe the hydrogen bonding between two H2O molecules.
How is it possible to obtain the structure of a molecule using x-ray diffraction from the molecular crystal?
What properties of water are unusual? How does hydrogen bonding explain some of these unusual properties?
The fact that ice is less dense than the liquid is important to weather and aquatic life. Explain.
In an experiment, 20.00 L of dry nitrogen gas, N2, at 20.0°C and 750.0 mmHg is slowly bubbled into water in a flask to determine its vapor pressure (see the figure below).The liquid water is
On a particular summer day, the temperature is 30.0°C and the relative humidity is 80.0% (which means that the partial pressure of water vapor in the ambient air is 80.0% of the equilibrium vapor
Look at the phase diagram for sulfur in Figure 11.12, bottom. What states of sulfur would you expect to see at each of the triple points? What solid phase would you expect to freeze out if you cooled
You may have seen the statement made that the liquid state is the stable state of water below 100°C (but above 0°C), whereas the vapor state is the stable state above 100°C. Yet you also know that
Carbon dioxide is often sold in steel cylinders. Use the data given in Figure 11.12, top, to answer the following questions.a. Describe what you would expect to see in the cylinder if it were
Consider the following two compounds: CH3CH2CH2CH2CH2OH 1-pentanol CH3CH2CH2CH2CH2CH3 hexane a. What are the different types of intermolecular forces that exist in each compound? b. One of these
Consider the following three compounds: CH3CHO, CH3CH2CH3, CH3CH2OH a. Describe the types of intermolecular forces that you expect to see in each. Explain how you arrived at these types. b. The heats
Here is some information about a compound. It has a melting point of 33°C, a normal boiling point of 81°C, a heat of fusion of 11 kJ/mol, and a heat of vaporization of 32 kJ/mol. What is its vapor
Rhenium forms a series of solid oxides: Re2O7 (yellow), ReO3 (red), Re2O5 (blue), and ReO2 (brown). One of them has a crystal structure with the following unit cell:a. How many rhenium atoms (gray
Shown below is the cubic unit cell of an ionic compound. Answer the questions by referring to this structure. Be careful to note that some atoms are hidden by those in front.a. One of the spheres
The vapor pressure of a volatile liquid can be determined by slowly bubbling a known volume of gas through the liquid at a given temperature and pressure. In an experiment, a 5.40-L sample of
In an experiment, a sample of 6.35 L of nitrogen at 25.0°C and 768 mmHg is bubbled through liquid acetone, C3H6O. The gas plus vapor at its equilibrium partial pressure leaves the liquid at the same
How much heat is needed to vaporize 10.0 mL of liquid hydrogen cyanide, HCN, at 25.0°C? The density of the liquid is 0.687 g/mL. Use standard heats of formation, which are given in Appendix C.
How much heat is needed to vaporize 20.0 mL of liquid methanol, CH3OH, at 25.0°C? The density of the liquid is 0.787 g/mL. Use standard heats of formation, which are given in Appendix C.
How much heat must be added to 12.5 g of solid white phosphorus, P4, at 25.0°C to give the liquid at its melting point, 44.1C? The heat capacity of solid white phosphorus is 95.4 J/(K∙mol); its
How much heat must be added to 25.0 g of solid sodium, Na, at 25.0°C to give the liquid at its melting point, 97.8°C? The heat capacity of solid sodium is 28.2 J/(K∙mol), and its heat of fusion
Acetic acid, CH3COOH, forms stable pairs of molecules held together by two hydrogen bonds.Such molecules€”themselves formed by the association of two simpler molecules€”are called dimers. The
The total pressure of vapor over liquid acetic acid at 71.3°C is 146 mmHg. If the density of the vapor is 0.702 g/L, what is the mole fraction of dimer in the vapor? See Problem 11.149.Problem
Explain in words how Avogadro’s number could be obtained from the unit-cell edge length of a cubic crystal. What other data are required?
Describe how you could purify iodine by sublimation.
Explain the production of an x-ray diffraction pattern by a crystal in terms of the interference of waves.
The following picture represents atoms of hypothetical, nonmetallic, monatomic elements A, B, and C in a container at a temperature of 4 K (the piston maintains the pressure at 1 atm). None of these
Part 1: a. Is it possible to add heat to a pure substance and not observe a temperature change? If so, provide examples. b. Describe, on a molecular level, what happens to the heat being added to a
Shown here is a curve of the distribution of kinetic energies of the molecules in a liquid at an arbitrary temperature T.The lines marked A, B, and C represent the point where each of the molecules
Consider a substance X with a ∆Hvap = 20.3 kJ/mol and ∆Hfus = 9.0 kJ/mol. The melting point, freezing point, and heat capacities of both the solid and liquid X are identical to those of water. a.
Using the information presented in this chapter, explain why farmers spray water above and on their fruit trees on still nights when they know the temperature is going to drop below 0°C.
Describe vapor pressure in molecular terms. What do we mean by saying it involves a dynamic equilibrium?
You are presented with three bottles, each containing a different liquid: bottle A, bottle B, and bottle C. Bottle A’s label states that it is an ionic compound with a boiling point of 35°C.
Shown here is a representation of a unit cell for a crystal. The orange balls are atom A, and the gray balls are atom B.a. What is the chemical formula of the compound that has this unit cell
As a demonstration, an instructor had a block of ice suspended between two chairs. She then hung a wire over the block of ice, with weights attached to the ends of the wire:Later, at the end of the
If you place water at room temperature in a well-insulated cup and allow some of the water to evaporate, the temperature of the water in the cup will drop lower than room temperature. Come up with an
The heats of vaporization for water and carbon disulfide are 40.7 kJ/mol and 26.8 kJ/mol, respectively. A vapor (steam) burn occurs when the concentrated vapor of a substance condenses on your skin.

Showing 5300 - 5400 of 15575

First
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
Last

Services

Sitemap
Fun
Definitions
Become Tutor
Study Help Categories
Recent Questions
Expert Questions

Company Info

Security
Copyrights
Privacy Policy
Terms & Conditions
SolutionInn Fee
Scholarship

Get In Touch

About Us
Contact Us
Career
Jobs
FAQ
Campus Ambassador

Secure Payment

Download Our App

© 2024 SolutionInn. All Rights Reserved