Thursday
December 18, 2014

Posts by Morgan


Total # Posts: 589

history Civil War
How might one challenge the idea that the United States was wiser after the Civil War?
December 17, 2014

chemistry
Which of the following elements can be detected by XPS? A. Hydrogen and lithium B. Boron and helium C. Lithium and boron
December 17, 2014

Chemistry
Nuclear magnetic resonance spectroscopy can be used to study which type of atoms? A. 16O B. 1H C. 2He
December 17, 2014

chemistry
Which of the following are excited in ultraviolet photoelectron spectroscopy? A. Valence electrons B. Core electrons C. X-rays
December 17, 2014

Chemistry
Brass is commonly used to make musical instruments because it is easily malleable and has excellent acoustic properties. It consists of many copper atoms, with some replaced with zinc. What type of alloy is this? A. Brazing B. Substitutional C. Interstitial D. Iron
December 16, 2014

Chemistry
A. Ionic solid B. Molecular solid C. Covalent solid D. Graphic solid Which of this solids is soluble in water, conductive in solution, brittle and could have a melting point of 2800 C. I think the answer is A.
December 16, 2014

Chemistry
Which of the following affects how strongly anions and cations are attracted to each other in a solid? A. The nucleus B. Empty valence orbitals C. Distance between anions and cations D. Neutrons I the answer b.
December 16, 2014

chemistry
I so sorry, it took until know for me to understand what an antenna. I never had to spell it so I didn't know its spelling. After looking at this the answer is A. Right?
December 16, 2014

chemistry
The oscillation of electrons in an antenna is an example of which type of radiation/waves/rays? A. Radio waves B. Infrared rays C. Microwaves D. VLF radiation I don't understand what is being asked so I don't have a clue on the answer.
December 16, 2014

Chemistry
Why are metals malleable? A. Because they reflect incoming photons B. Because they are made of atoms that have tightly held electrons C. Because of their structure and uniform bonding in all directions D. Because their lattice energy is very high I think the answer is c but I ...
December 16, 2014

Chemistry
Which of the following is not true about molecular orbital theory? A. The bonding molecular orbital is filled before the antibonding orbital. B. Each molecular orbital can accommodate only one electron. C. The number of molecular orbitals formed is often equal to the number of...
December 16, 2014

Chemistry
The oscillation of electrons in an antenna is an example of which type of radiation/waves/rays? A. Radio waves B. Infrared rays C. Microwaves D. VLF radiation
December 16, 2014

chemistry
Which of the following spectroscopies is/are suitable for studying materials on surfaces? A. IR and UV/V B. UV/V C. NMR D. XPS and UPS
December 15, 2014

Chemistry
Which of the following is an example of sp3d2 hybridization? A. C2H6 B. IF7 C. PCl5 D. SF6
December 15, 2014

chemistry
Which statement best describes what must occur for two atoms to combine to form a chemical bond? A. The electrons of one nucleus must transfer to the nucleus of the second atom for a chemical bond to form. B. The repulsive forces of both nuclei must overcome their attractive ...
December 15, 2014

Chemistry
What is an ionic solid? A. One positive ion and one negative ion bonded to form a solid B. Many nonmetal atoms bonded together to form a solid C. Many positive and negative ions bonded to form a solid D. Many metal atoms bonded together to form a solid I believe the answer is ...
December 15, 2014

chemistry
In the Bohr model, which is the lowest energy state available for an electron? A. nth B. excited state C. first state D. ground state Im thinking the answer is c or d.
December 15, 2014

Chemistry
Which electron would have the highest ionization energy for an oxygen atom? A. 2nd B. 1st C. 5th D. 6th If it is the highest I was guessing b or d.
December 15, 2014

chemistry
A. Orbital shape B. Orientation in the orbital C. Main energy level D. Electron spin
December 15, 2014

chemistry
What is an ionic solid? A. One positive ion and one negative ion bonded to form a solid B. Many nonmetal atoms bonded together to form a solid C. Many positive and negative ions bonded to form a solid D. Many metal atoms bonded together to form a solid I believe the answer is ...
December 15, 2014

chemistry
For an atom of sulfur, which electron would require the least amount of energy to remove from the atom? A. 3s2 B. 1s1 C. 3p1 D. 3p4 I think the answer is c or d, preferring d. What would you go with?
December 15, 2014

Chemistry
I submitted the question and the correct answer was b. Thank you so much for helping me. I think the concept is just whole number. SInce you can't have a half of a student the answer was b.
December 14, 2014

Chemistry
Which of the following is an example of quantization? A. The amount of time spent in a classroom B. The number of students in a classroom C. Learning happening in a classroom D. The temperature range in a classroom I know I asked this question but I would this paragraph. Is it...
December 14, 2014

chemistry
Which of the following is an example of quantization? A. The amount of time spent in a classroom B. The number of students in a classroom C. Learning happening in a classroom D. The temperature range in a classroom I strongly believe the answer is A. Any objections.
December 14, 2014

Algebra
Marie, a resident of Metropolis, pays Metropolis an annual tax of $46 plus 2.4% of her annual income. If Marie paid $1,558 in tax, what was Marie's income?
December 12, 2014

Chemistry
Red light has a wavelength of 700 nm and a frequency of 4.3 x 1014 s-1. What is the energy of a single photon of red light? A. 2.85 x 10-34 J B. 2.85 x 1019 J C. 2.85 x 10-20 J D. 2.85 x 10-19 J
December 12, 2014

chemistry
In which unit is the wavelength of an electromagnetic wave commonly measured? A. J B. nm C. s–1 D. kg All most positive it is b but I just wanted to make sure.
December 12, 2014

To Drbob222
I just wanted to tell you that all my tests are supervised by a teacher. My questions are part of practice tests and review questions.
December 12, 2014

Chemistry
What does the photoelectric effect show about the connection between light and electrons? A. Light can remove electrons from atoms. B. Electrons are composed of light. C. Light is composed of electrons. D. It takes 2 photons of light to cause 1 electron to begin flowing.
December 12, 2014

chemistry
I answered all your questions what do you think about this one. I crossed off b and d because sodium has only one election. Am I correct with that statement.
December 12, 2014

chemistry
I answered those questions
December 12, 2014

chemistry
A sodium atom when excited gives off two very specific wavelengths of visible light. What does this tell us about sodium? A. There are two principal electron transitions in sodium. B. There are two electrons in a sodium atom. C. A sodium atom has its electrons in two energy ...
December 12, 2014

To Morgan
1. I am geting the questions from the apex learning website. 2. I do not attend a university/college. I go to Laurel Springs In California. A school that goes from K-12th. 3. This is the same question as number 1. 4. I have a textbook as well as the apex learning website. 5. I...
December 12, 2014

To Morgan
Hello BrBob222. I am taking AP chemistry at Laurel Springs In California. The class is through apex and I have a 94% in the class.
December 12, 2014

chemistry
What is the difference between the ionization energy of inner-shell electrons and the ionization energy of outer-shell electrons? A. The ionization energy of inner-shell electrons is less than the ionization energy of outer-shell electrons. B. They are equal to each other. C. ...
December 12, 2014

Chemistry
so the answer is d
December 12, 2014

Chemistry
Which of the following is an example of quantization? A. The amount of time spent in a classroom B. The number of students in a classroom C. Learning happening in a classroom D. The temperature range in a classroom What is the definition of quantization
December 12, 2014

chemistry
the answer was b
December 11, 2014

chemistry
Which statement describes the principal quantum number (n)? A. The quantum number that indicates the subshell occupied by an electron B. The quantum number that indicates the energy level of the electron C. A subdivision of an energy level in an atom D. The probability of ...
December 11, 2014

chemistry
What does the fact that a blackbody can absorb light only in specific-sized "packets" say about light? A. It has no mass. B. It is composed of electrons. C. It is composed of atoms. D. It is quantized. I have no idea what the answer is
December 11, 2014

Chemistry
All electromagnetic energy (light), including gamma rays through radio waves, has what in common? A. Speed B. Wavelength C. Frequency D. Energy E. Amplitude I think a
December 11, 2014

chemistry
What does electron affinity depend on? A. Both the effective nuclear charge and the number of shells in the atom containing electrons B. Attraction between the protons and neutrons C. Only the effective nuclear charge D. Attraction between the valence electrons and core ...
December 11, 2014

Chemistry
Core electrons shield what from the pull of the nucleus? A. Identical electrons B. Valence electrons C. Neutrons D. Protons I was thinking d or a.
December 11, 2014

Chemistry
I am doing a lab and broke my glass beaker. Is it of to put 0.1 M hydrochloric acid in a plastic beaker?
December 11, 2014

chemistry
The ?H of the reaction below is -575.13 kJ. Is this reaction spontaneous? 2ZnS + 3O2 + C ? 2SO2 + 2Zn + CO2 A. It is not because the ?H of the reaction is negative. C. It depends on the temperature because the ?H of the reaction is negative and the ?S is negative. D. It ...
December 11, 2014

chemistry
In a earlier post you said d. Why?
December 11, 2014

chemistry
I get 14.1. Should I got with a.
December 11, 2014

chemistry
is q 846.45
December 11, 2014

chemistry
I know its not the answer so what did I do wrong
December 11, 2014

chemistry
this is what I got. .0599*4.18*2.7=.6760
December 11, 2014

chemistry
When 3.2 g of ammonium chloride is dissolved in 75 g of water, the temperature of the solution decreases from 22.8°C to 20.1°C. What is the energy of dissolution of NH4Cl per mole? (The molecular mass of NH4Cl = 53.49 g/mol, and the specific heat of water = 4.18 J/g&...
December 11, 2014

Chemistry
When 3.2 g of ammonium chloride is dissolved in 75 g of water, the temperature of the solution decreases from 22.8°C to 20.1°C. What is the energy of dissolution of NH4Cl per mole? (The molecular mass of NH4Cl = 53.49 g/mol, and the specific heat of water = 4.18 J/g&...
December 10, 2014

chemistry
I tried your formula to get 470. What am I doing wrong? m*.444*-3.1 + 50*4.18*3.1=0 -1.3764m + 647.9 =0 m = -647.9/-1.3764
December 10, 2014

chemistry
A sample of nickel is heated to 95.0°C and placed in a coffee-cup calorimeter. If the 50.0 g of water in the calorimeter is initially 22.3°C and warms to 25.4°C, what mass of nickel was heated? (The specific heat of nickel is 0.444 J/°C g and water is 4.18 J/&...
December 10, 2014

chemistry
A sample of nickel is heated to 95.0°C and placed in a coffee-cup calorimeter. If the 50.0 g of water in the calorimeter is initially 22.3°C and warms to 25.4°C, what mass of nickel was heated? (The specific heat of nickel is 0.444 J/°C g and water is 4.18 J/&...
December 10, 2014

chemistry
I believe the answer is b. Do you guys think I am correct.
December 9, 2014

chemistry
What is the entropy change associated with the chemical reaction that occurs when iron oxide is converted to its metal form? Fe2O3(s) + 3CO(g) → 2Fe(s) + 3CO2(g) A. Zero B. Positive C. Negative D. Cannot be determined I think the answer is b or c.
December 9, 2014

chemistry
The enthalpy of formation of C2H5OH is -238.7 kJ/mol. What information does this reveal about the bonds in the molecule? A. Bond formation in C2H5OH from its elements only occurs in cold temperatures. B. Bond formation in C2H5OH from its elements does not occur. C. Bond ...
December 9, 2014

math
Compute Mary's estimated tax payment for the first quarter. She is self-employed and she expects to earn $61,440 this year. Her estimated income tax rate is 22%. For self-employed persons, social security tax is 12.4% of wages up to $106,800, and Medicare tax is 2.9% of ...
December 7, 2014

spanish
Quiero _____ mi esposo Jorge. I think the personal a is necessary
December 7, 2014

spanish
what about this one Necesito _____ un abogado. The "personal a" is necessary. The "personal a" is not necessary. I think that it is not necessary
December 7, 2014

spanish
Juan oye _____ su perro Spot. Would I use a personal a in the blank or leave it as it is.
December 7, 2014

Math - Differentiate
I just need an explanation of hoe to solve the following: f(x)= ln (x^3 + 5)+ 6x
December 7, 2014

Chemistry
If ammonia is manufactured at 356 K, is the reaction spontaneous, given that the enthalpy and entropy change for the reaction are -93 kJ/mol and -198 J/mol K, respectively? A. Yes, the ΔG is -92 kJ/mol. B. No, the ΔG is 92 kJ/mol. C. No, the ΔG is 22.5 kJ/mol. D...
December 6, 2014

Chemistry
The ΔH of the reaction below is -575.13 kJ. Is this reaction spontaneous? 2ZnS + 3O2 + C → 2SO2 + 2Zn + CO2 A. It is not because the ΔH of the reaction is negative. B. It is because the ΔH of the reaction is negative. C. It depends on the temperature ...
December 5, 2014

chemistry
At temperatures above 0°C, what is the sign of the change in free energy for the conversion of liquid water to ice? A. Positive B. Zero C. Negative D. Not known I don't this it is A. I thought it might be c.
December 4, 2014

history
During the 1920s, Women assumed new roles. List these roles; then choose one and describe in 5 – 10 sentences the impact of this new role in women’s lives.
December 2, 2014

chem please help drbob222
Why is it important in gravimetric analysis to add an excess amount of precipitating ions to a solution containing an analyte
December 2, 2014

chem please help drbob222
why can't gravimetric analysis be used to determine the concentration of sodium nitrate (NaNO) in a solution? I think the answer is because NaNO dissolves in water. Am I correct
December 2, 2014

calculus
When a ball is thrown vertically upward into the air with a velocity of 79 ft/sec its height, y(t), in feet after t seconds is given by y(t) = 79t − 16t 2 . Find the average velocity of the ball over the interval from 3 to 3 + h seconds, h 6=/= 0. 1. average vel. = &#...
December 1, 2014

Math
3/4 divided by 2/3 is the same as 3/4 multiplied by 3/2. The answer is 9/8.
November 26, 2014

chem please help
What is Gibbs free energy? A. The energy lost as heat to the surrounding molecules B. The usable energy released or absorbed by a reaction C. The energy in the form of kinetic energy in a system D. The energy contained within the bonds of molecules Do not give me a website to ...
November 26, 2014

chem please help
At temperatures above 0°C, what is the sign of the change in free energy for the conversion of liquid water to ice? A. Positive B. Zero C. Negative D. Not known
November 26, 2014

Chem please help
What is Gibbs free energy? A. The energy lost as heat to the surrounding molecules B. The usable energy released or absorbed by a reaction C. The energy in the form of kinetic energy in a system D. The energy contained within the bonds of molecules
November 26, 2014

chem please help
If the ΔH for H2O(l) → H2O(s) is -6.01 kJ, then what is the ΔH for 2H2O(s) → 2H2O(l)? A. -12.02 kJ B. 6.01 kJ C. -6.01 kJ D. 12.02 kJ I think d.
November 26, 2014

chem please help drbob222
I think the answer is d or b.
November 26, 2014

chem please help drbob222
What will be the result of a reaction if its enthalpy change is positive, its entropy change is negative and Gibbs free energy is positive? A. Spontaneous, if the temperature is high B. Nonspontaneous, if the temperature is low C. Always spontaneous D. Never spontaneous
November 26, 2014

chemistry
The G value for formation of gaseous water at 298 K and 1 atm is -278 kJ/mol. What is the nature of the spontaneity of formation of gaseous water at these conditions? A. The reaction is never spontaneous. B. The reaction is sometimes spontaneous. C. The reaction is spontaneous...
November 25, 2014

chem please help
What is steel? A. It is a compound of iron and various other elements including carbon. B. It is an ionic substance made of iron and various other elements including carbon. C. It is an alloy of iron and various other elements including carbon. D. It is a composite of iron and...
November 25, 2014

Chem please help
Which of the following correctly describes the net energy change during a reaction? A. The net change in energy is negative for endothermic reactions where energy is required. B. The net change in energy is positive for endothermic reactions where energy is required. C. The ...
November 25, 2014

Chem please help
What is Gibbs free energy? A. The energy lost as heat to the surrounding molecules B. The usable energy released or absorbed by a reaction C. The energy in the form of kinetic energy in a system D. The energy contained within the bonds of molecules
November 25, 2014

chem please help drbob222
the answer was d It helps in determining which metal uses less energy during refining.
November 25, 2014

chem please help drbob222
Why is the process of examining enthalpies of a reaction helpful? A. It helps in determining how a reaction occurs spontaneously. B. It helps in determining the temperature that a reaction requires to proceed. C. It helps in determining how fast a reaction will proceed. D. It ...
November 25, 2014

chem please help drbob222
In the roasting of zinc ore, the total enthalpy for the reactants is -412.0 kJ and the total enthalpy for the products is -1294.54 kJ. What is the enthalpy for the roasting reaction? A. 882.54 kJ B. -1706.54 kJ C. 1706.54 kJ D. -882.54 kJ I think the answer is d.
November 25, 2014

chem please help drbob222
When is there a need to determine G? A. When H > 0 and S = 0 B. When H > 0 and S > 0 C. When H = 0 and S < 0 D. When H > 0 and S < 0 P.S. there are triangles before the G, H, and S.
November 25, 2014

chem please help drbob222
I knew that. It doesn't match any of the answers
November 25, 2014

chem please help drbob222
What is Gibbs free energy? A. The energy lost as heat to the surrounding molecules B. The usable energy released or absorbed by a reaction C. The energy in the form of kinetic energy in a system D. The energy contained within the bonds of molecules
November 25, 2014

Chemistry
What is Gibbs free energy? A. The energy lost as heat to the surrounding molecules B. The usable energy released or absorbed by a reaction C. The energy in the form of kinetic energy in a system D. The energy contained within the bonds of molecules
November 25, 2014

chemistry
the answer is b
November 25, 2014

chemistry
What is ΔH in the equation ΔG = ΔH - TΔS? A. The change in specific heat between the products and the reactants B. The change in enthalpy between products and reactants in a reaction C. The change in entropy between products and reactants in a reaction D. ...
November 25, 2014

chemistry
Nope. This is AP chemistry.
November 25, 2014

chemistry
What would cause entropy to increase in a reaction? A. The products forming a more rigid structure B. The products forming an ordered pattern C. The products becoming more spread out D. The products forming fewer molecules I think the answer is c or d
November 25, 2014

Chemistry help drbob222
Which of the following processes would result in a negative entropy change? A. Leaves falling off a tree B. A deck of cards falling on the floor C. A piece of cake crumbling as it is cut D. A student filing papers I think d
November 25, 2014

American history
I have to answer these questions: 5. Compare the viewpoints of the senators in the Versailles Treaty. 6. What was the final outcome of the Treaty of Versailles for the United States? 7. How was the map of Europe and the Middle East transformed as a result of the treaty? Please...
November 24, 2014

Chem please help
What does the second law of thermodynamics say about entropy? A. Only changes in entropy can be measured. B. The entropy in a system is zero at equilibrium. C. The entropy in a system and its surroundings tends to increase. D. Entropy cannot be created or destroyed. I think c.
November 24, 2014

chem please help
What characteristic best describes the low entropy associated with solids? A. The atoms in a solid are mostly metals. B. The atoms are held together with strong bonds. C. The atoms are arranged in a rigid structure. D. The solid has a high specific heat capacity. I think c.
November 23, 2014

Chem please help
Which of the following would have the greatest entropy? A. Water placed in the refrigerator B. Water sitting out on the kitchen counter C. Water vapor D. An ice cube I think c what about you drbob222
November 23, 2014

Chemistry help drbob222
Hows this: The first area has the temperature of 18 degrees Celsius while the second area has the temperature of 45 degrees Celsius. It is proven that thermal energy is connected with kinetic energy. In other words, the higher temperature of the second area shows us that the ...
November 22, 2014

Chemistry
I have an assignment. It has two boxes to model the particles of the same gas at different temperature (18 and 45 degrees Celsius). I have to write two or three sentences relating the temperature, the average kinetic energy, and the motion of the particles in the two boxes. ...
November 22, 2014

Chemistry
The solvability rules is your best bet with this type of situation. You could always google the product to read about its state at normal temperatures and pressures. Would you like me to give you the solvability rules?
November 22, 2014

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