Rank the crystal lattice structures in order of decreasing efficiency of space in the structure.
20,908 results, page 7

chemistry
Which of the following changes will decrease the total amount of gaseous solute able to be dissolved in a liter of liquid water? increasing temperature increasing pressure decreasing surface area decreasing temperature 
chemistry
Which of the following changes will decrease the total amount of gaseous solute able to be dissolved in a liter of liquid water? increasing temperature increasing pressure decreasing surface area decreasing temperature 
Calculus
The fuel efficiency, E, in litres per 100 km, for a car driven at speed v, in km/h is E(v)=1600v/(v^2+6400) a) determine the legal speed that will maximize the fuel efficiency using speed limit of 50 km/h 
chem
Consider a Carnot engine operating between the temperatures of 300. K and 189 K. Find the efficiency of this engine. Assume, now, that the isothermal step at 300. K is not reversible and the expansion takes place against a constant external pressure of 5.00 atm. Find the ... 
AP Chemistry
Rank these compounds in order of increasing hyroxide ion concentration: weak base, weak acid, strong base, strong acid. 
chemistry
Suppose that after measuring the pH of 1.05 M HCl solution, three drops (0.20 mL) of the solution remain behind on the pH electrode. a) When this electrode is then dipped into 100 mL of pure distilled water, show by calculation that the pH of the water is not pH = 7. b) ... 
physics # 4
For the following question rank the objects in order from greatest to least. 4. Which object would be the most difficult to begin spinning about its center of mass? a.) Solid sphere b.) Hollow sphere c.) Hallow cylinder d.) Solid disk e.) Solid cylinder 
chemistry (helppp me)
what is the bond order for BeF2? according to the lewis structure? ....according to MO diagrams its 0. 16 valence e 
Chemistry
Im not sure where to factor in the two longer compounds for this problem. "Rank the given compounds based ontheir relative acidities" HF H2CCH2 NH3 CH4 HCCCH3 This is the order i thought it was, but this isnt right apparently... ( means triple bond,  means double bond) 
Business
Learning economics is like having you own crystal ball. The more you understand it as a social science, the more you understand how our economy and political system works. I say like a crystal ball, because you will be able to see things that other people without the same ... 
english
Which of the following sentences is written correctly? a. When properly designed, an automobile can achieve great fuel efficiency. b. When properly designed an automobile can achieve great fuel efficiency. c. When properly designed, great fuel efficiency can be achieved by an ... 
Reading
2. Which of the following sentences is written correctly? A When properly designed, an automobile can achieve great fuel efficiency. B. When properly designed an automobile can achieve great fuel efficiency. C. When properly designed, great fuel efficiency can be achieved by ... 
Microeconomics  iso & indiff
What does isoquant/isocost & indifference curve and budget constraint analysis have in common? I know that they both 'look' similar & both strive to find the same things "consumers want utility" & "producers want eco profits" (maximising both). What other things do they have ... 
Math
The city council gave a questionnaire to its citizens, asking them to rank their priorities for next year's budget. People were asked to rank the following four choices: (P)olice, (R)oads, (S)chools, and (T)rash removal. The results are summarized in the table below. ... 
Solar Energy
a) Consider a lead acid battery with 100Ah capacity and a rated voltage of 24V. What is the total capacity of energy in Watthours that can be stored in the battery? b) Assume that the battery is completely empty. The battery is now charged at a Crate of 0.50C. What is the ... 
Economics
Which of the following results from having a nation having conflicting economic goals? A. the nationalizing of some industries B. the need to rank choices in order of importance C. the need for economic safety nets D. government regulation of domestic industries 
Calculus
Given f(x)=sin(x)2cos(x) on the interval [0,2pi]. Determine where the function is concave up and concave down, and increasing and decreasing. I have found that the answer for decreasing is (2.68,5.82). All answers are to be in interval notation like that one. 
AP Chemistry
1. The heat of solution of salta may either be endothermic or exothermic. What factors determine this? 2. As a solution freezes, why does the freezing temperature continue to decrease? 3. When the concentration of very dilute aqueous solutions are calculated, why are the ... 
linear algebra
Solve using the concept of rank. Is S={−16 −7 −21,2 1 3, 21 9 2} a linearly independent set of vectors in R3? So I know how to find out if this set is linearly indep. But, I don't know how to use row rank to find this out.. 
Physics
A 170 kg astronaut (including space suit) acquires a speed of 2.75 m/s by pushing off with his legs from a 2400 kg space capsule. What is the average change in speed in meters/second of the space capsule? 
english
what does structure mean when writing an essay on ballads If you mean structure of the essay, that refers to how you organize your paragraphs within your paper. Are you following a comparison/contrast pattern? Are you explicating the poem? What you are writing about determines... 
Economics
What is an oligopoly? A. An agreement by a formal organization of producers to coordinate prices and production B A market structure in which a few large firms dominate the market C A market structure in which two firms have a price way D a market structure in which a single ... 
PhysicsPlease help
I have a question about the International Space StationIts been orbiting earth at 350kmIf the radius of the earth is 6,370 km, what is the period of orbit for the Space Station? Secondly, if it was moved to a geosynchronous orbit, what would the new altitude of the station ... 
calculus
is the function f(x)=x^2 increasing on decreasing at x = 1. can anyone please check my reasoning: the value of the derivative of the function at x=1 is 2, so that means the slope of the tangent line to the graph at that is a negative value so the function is decreasing at x... 
chemistry
What is the plane and lattice structure that is represented in this picture? SC (100) BCC (100) FCC (100) SC (110) BCC (110) FCC (110) SC (111) BCC (111) FCC (111) 
chemistry
Given: 2so2 + o2 > 2so3 + 44kcal Which change increase the concentration of so4? a. increasing temperature b. increasing the concentration of o2 c. decreasing the pressure d. decreasing the concentration of so2 
Science
Consider a leadacid battery with 500 Ah capacity and a rated voltage of 12 V. a)What is the total capacity of energy in watthours that can be stored in the battery? b)Assume that the battery is completely empty. The battery is now charging at a Crate of 0.20C. What is the ... 
Statistics
Profitability remains a challenge for banks and thrifts with less than $2 billion of assets. The business problem facing a bank analyst relates to the factors that affect return on assets(ROA), an indicator of how profitable a company is relative to its total assets. Data ... 
Chem
Give three examples each of household items that have: a. different structures and exhibit different properties b. same chemical makeup composition but a different structure, hence, different properties c. the same properties but with different chemical composition 
Math
Andie is designing a rectangular play space for her dogs. The length of the play space is 7ft. and the width is 6ft. The new space will have a length and width twice the dimensions of the current space. She needs to purchase sod to cover the ground inside the play space. Write... 
Chemistry
What is the enthalpy change (in kJ/mol) for the following process? Na+(g) + Br(g) > NaBr (s) Hint: use the BornHaber cycle Note: the reference state for Br2 is Br2(l) not Br2(g) Data (in kJ/mol): enthalpy of sublimation of Na(s): 107 standard enthalpy of formation of ... 
Computers (Java)
Hello  Looking for help with an extra credit assignment to give my grade a needed boost. The program is to display a star pattern with java loops. From prof: 7. Write a program using loops to display the star pattern that follows the written description. You need to ask the ... 
Computers (Java)
Hello  Looking for help with an extra credit assignment to give my grade a needed boost. The program is to display a star pattern with java loops. From prof: Write a program using loops to display the star pattern that follows the written description. You need to ask the ... 
stats
for some independent data using the mann whitney test group a has rank sum of 97.5 with group size = 9 group b has a rank sum of 92.5 with a group size of 10 from the data table i have the two critical values for p=0.05 are 65 and 115 i know im supposed to compare them and ... 
statistics
for some independent data using the mann whitney test group a has rank sum of 97.5 with group size = 9 group b has a rank sum of 92.5 with a group size of 10 from the data table i have the two critical values for p=0.05 are 65 and 115 i know im supposed to compare them and ... 
problem solving
kirk grew a crystal in science class. On monday it was 13/16 inch tall. it had grown 1/4 inch bet friday and monday. It had grown 1/2 inch between Tues and Fri. How tall was Kirk'a crystal on Tues? 
biology
please help me unscrample the following words: (the space means thate the anagram has two words in it, but the space is not necessarily at the space) rmns teizysecntiore nt roetssieitrsic id ksdxlne so derrecisgntdie Thank you very much for your time! Lily ... 
science
Objects take up space and move through space different ways. Scientists use these differences to make models. For example, how a rubber band stretches helps you "see" the force acting on it. How could you use space relationships to model Earth and its moon? 
CHEMISTRY HELP ASAP!
is it possible for one molecule of salicylic acid to form an ester with a second molecule of the same substance? Use equations and/or structures. Please help, i am pretty sure it couldn't because of steric hindrance, however i am not sure how to explain this further and what ... 
physics.
Heat engine X takes four times more energy by heat from the hot reservoir than heat engine Y. Engine X delivers two times more work, and it reject seven times more energy by heat to the cold reservoir than heat engine Y. Find the efficiency of heat engine X and heat engine Y. ... 
chemistry
THe thiocyanate ion acts as a Lewis base, donating a pair of electrons to the Fe ^ 3+ ion. Both sulfur and nitrogen atoms have lone pair electrons that can potentially be donated. Therefore, ther are two different structures (linkage isomers) that can be created when Fe(H2O)6... 
Physics
A 2hp motor drives a sanding belt. If the efficiency of the motor is 87% and that of the sanding belt 75% due to slippage, what is the overall efficiency of the system? The answer has to be 65.25%. Can someone please help me to work it out? 
math
Let f(x) = 3+4xx^{3}. Find the open intervals on which f is increasing (decreasing). Then determine the xcoordinates of all relative maxima (minima). 1. f is increasing on the intervals? 2. f is decreasing on the intervals? 
Lauren
Let f(x) = 3+4xx^{3}. Find the open intervals on which f is increasing (decreasing). Then determine the xcoordinates of all relative maxima (minima). 1. f is increasing on the intervals 2. f is decreasing on the intervals 
Physics
Two 2.160 kg crystal balls are 0.870 m apart in the vertical direction. Calculate the magnitude of the gravitational force they exert on a 8.80 g marble located 0.260 m horizontally out from the center of a line that intersects the centers of the balls. (For your own knowledge... 
Precalculus
A lattice point is a point with integer coordinates. How many lattice points (x,y) with 100 less than or equal to x less than or equal to 100 and 100 less than or equal to y less than or equal to 100 are on the graph of the parametric equations x=3040 cos t y=50 + 30 cos t ? 
Precalculus
A lattice point is a point with integer coordinates. How many lattice points (x,y) with 100 less than or equal to x less than or equal to 100 and 100 less than or equal to y less than or equal to 100 are on the graph of the parametric equations x=3040 cos t and y=50 + 30 ... 
Civics
The Tampa Port Authority is one of the largest ports in Florida. It has been given the designation of special purpose district by the local government in order to increase efficiency. Why are special purpose districts created? Pls help lol. 
Chemistry 12
The complete combustion of 1.00mL of octane increases the temperature of 250.00g of water by 22.7 degrees Celsius. The density of octane is 0.70g/mL. What is the efficiency of the octane in heating the water? I attempted this question and I have 400 something percent ... 
English/ Help
. Which of the following sentences is written correctly? A When properly designed, an automobile can achieve great fuel efficiency. B. When properly designed an automobile can achieve great fuel efficiency. C. When properly designed, great fuel efficiency can be achieved by an... 
english
Which of the following sentences is written correctly? A When properly designed, an automobile can achieve great fuel efficiency. B. When properly designed an automobile can achieve great fuel efficiency. C. When properly designed, great fuel efficiency can be achieved by an ... 
Chemistry  Acid structure
I'm writing up a lab report for the an experiment in the separation and analysis of an unknown mixture (acid and neutral compound). The guideline I'm looking at states "You do need to include balanced reaction(s). Since you do not know the exact structure of your acid, you may... 
physics
A quantity of an ideal gas is compressed to half" its initial volume. The process may be adiabatic, isothermal or isobaric. Rank those three processes in order of the work required of an external agent, least to greatest. doesn't adiabatic mean no work, so it would be the ... 
physics
A quantity of an ideal gas is compressed to half" its initial volume. The process may be adiabatic, isothermal or isobaric. Rank those three processes in order of the work required of an external agent, least to greatest. doesn't adiabatic mean no work, so it would be the ... 
chemistry (need asap!)
is it possible for one molecule of salicylic acid to form an ester with a second molecule of the same substance? Use equations and/or structures. Please help, i am pretty sure it couldn't because of steric hindrance, however i am not sure how to explain this further and what ... 
Chemistry
I need help with getting started: 1.The crystal structure of an ionic compound consists of alternating cations and anions lying next to each other in three dimensions. If the cation radius is 55.1% of the anion radius and the distance between the cation nuclei is 587 pm, what ... 
History
NASA, space shuttles, and the International Space Station are (a)all related to Cold War spy technology (b) joint scientific study and space exploration efforts (c) United States efforts to build anti missile defenses (d) belief in extraterrestrial life 
math
Below is a sample space for a family with 3 children. BGG stands for the oldest child being a boy, the middle child a girl, and the youngest a girl. Use the sample space to answer the question: How many outcomes are in the sample space? Sample Space BBB BBG BGB BGG GBB GBG GGB... 
physics
a 200 kg block was moved along an inclined plane to a height of 10m. during this process 3000J of energy was lost due to friction. a. calculate the efficiency of the inclined plane. b. what would the efficiency of the simple machine be if the incline were frictionless? c. how ... 
ap chemistry
Arrange the bases I) deuterated ammonia (ND3) Kb = 1.1 × 10−5; II) hydrazine (NH2NH2) Kb = 1.7 × 10−6; III) hydroxylamine (NH2OH) Kb = 1.1 × 10−8; IV) ammonia (NH3) Kb = 1.8 × 10−5; in decreasing order of strengths. 
Exploring Space
what wud hold the cable of a space elevator up? Would it be earth's gravity holding the cable of a space elevator up? 
math
A parking lot space is in the shape of a rectangle. If the space has a length of 23 feet and a width of 12 feet, what is the area of the parking space? 
physics
1) what is the efficiency of a frictionless inclined plane? 2) how would you increase the efficiency pf an inclined plane? 
science
Which of the following explains the relationship between genes and chromosomes. a) Chromosomes come in diffrent versions called genes. b) genes come in diffrent structures called chromosomes. c) Chromosomes are structures that are made up of two versions called genes. d) genes... 
Chemistry
Consider the Lewis structure for the major resonance form of PCS–. (Note that carbon is the central atom.) The structure shows: a. A phosphoruscarbon triple bond and a carbonsulfur single bond. b. A phosphoruscarbon double bond and a carbonsulfur double bond c. A ... 
Chemistry
In terms of aromatic compounds, how do I determine which pairs of structures are correct representations of resonance forms? For example in these structures: img33.imageshack.us/img33/2756/70725074.jpg I know there has to be a single bond, double bond, single bond pattern. But... 
managerial economics
Can someone explain cost structure and market structure to me please. 
managerial economics
Can someone explain cost structure and market structure to me please. 
Analytical CHM
Rank the following items in order of accuracy when they are used for their intended purpose: Volumetric pipet, beaker, Erlenmeyer flask, MOHR pipet, graduated cylinder, volumetric flask, buret. Explain your asnwer below Most accurate 1. 2. 3. 4. 5. 6. Least accurate 7. Rationale: 
physics repost
A quantity of an ideal gas is compressed to half" its initial volume. The process may be adiabatic, isothermal or isobaric. Rank those three processes in order of the work required of an external agent, least to greatest. doesn't adiabatic mean no work, so it would be the ... 
related rates
A spherical snowball is melting in such a way that its diameter is decreasing at rate of 0.4 cm/min. At what rate is the volume of the snowball decreasing when the diameter is 8 cm. (Note the answer is a positive number). 
Math!
A spherical snowball is melting in such a way that its diameter is decreasing at rate of 0.4 cm/min. At what rate is the volume of the snowball decreasing when the diameter is 10 cm. (Note the answer is a positive number). 
math
A spherical snowball is melting in such a way that its diameter is decreasing at rate of 0.2 cm/min. At what rate is the volume of the snowball decreasing when the diameter is 12 cm. (Note the answer is a positive number). 
calc
A spherical snowball is melting in such a way that its diameter is decreasing at rate of 0.4 cm/min. At what rate is the volume of the snowball decreasing when the diameter is 16 cm. (Note the answer is a positive number). 
CAL
(1 pt) A spherical snowball is melting in such a way that its diameter is decreasing at rate of 0.3 cm/min. At what rate is the volume of the snowball decreasing when the diameter is 8 cm. (Note the answer is a positive number). 
calculus
f(x)= −x2lnx find the critical points , increasing & decreasing interval and concavity.Please just show me the steps on how to get the increasing and decreasing interval and critical pts . Thanks :) 
calculus
A spherical snowball is melting in such a way that its diameter is decreasing at rate of 0.2 cm/min. At what rate is the volume of the snowball decreasing when the diameter is 8 cm. (Note the answer is a positive number). 
Algebra
A rectangle was 25 cm longer than it was wide. A new rectangle was formed by decreasing the length by 6 cm and decreasing the width by 5 cm. The area of the new rectangle was 585 cm squared. Find the dimensions of the original rectangle. 
Calc
A spherical snowball is melting in such a way that its diameter is decreasing at rate of 0.3 cm/min. At what rate is the volume of the snowball decreasing when the diameter is 13 cm. (Note the answer is a positive number). 
electronic
sketch the atomic structure of copper and discuss why it is a good conductor and how its structure different from Ge and Si 
Physics
Three solid cylinder rods roll down a hill with the same linear speed. Rod R1 has a 1inch diamter, Rod R2 has a 2inch diameter, and Rod R3 has a 3inch diameter. They all have the same masses. Rank in order the rotational energies of R!, R2, and R3. a. E1 > E2 > E3 b. E3... 
Physics
Three solid cylinder rods roll down a hill with the same linear speed. Rod R1 has a 1inch diamter, Rod R2 has a 2inch diameter, and Rod R3 has a 3inch diameter. They all have the same masses. Rank in order the rotational energies of R!, R2, and R3. a. E1 > E2 > E3 b. E3... 
Physics
Three solid cylinder rods roll down a hill with the same linear speed. Rod R1 has a 1inch diamter, Rod R2 has a 2inch diameter, and Rod R3 has a 3inch diameter. They all have the same masses. Rank in order the rotational energies of R!, R2, and R3. a. E1 > E2 > E3 b. E3... 
science
What order is the radioactive decay of carbon14, an unstable isotope of carbon? A. Third order B. Second order C. Zero order D. First order 
Chemistry
Please help I have no idea how to do this. There are three different dichloroethylenes (molecular formulaC2H2Cl2), which we can designate X, Y, and Z. Compound X has no dipole moment, but compound Z does. Compounds X and Z each combine with hydrogen to give the same product: ... 
increasing decreasing calc
f(x)=x^3=12x24 f'(x)=3x^2+12=0 3x^2=12 x^2=4 what is x. would it be x=2 and 2 because i have to find the interval where the function is increasing or decreasing. i already know how to find the answer but i just got confused on finding the zeros first <<f(x)=x^3=12x... 
Economics
Do all firms in all market structures have anything in common? I think not. They all consist of buyers and sellers. In Principals of Microeconomics courses, economists make several general economic assumptions (perhaps incorrectly I might add) about firms and the behavior of ... 
science
1. a stream of water will bend toward a balloon that has been rubbed on a sweater to generate static charge. Which property of water is responsible for this behavior? A. THE polarity of the water molecule b. the ability of water to form hydrogen bonds with itself c. the heat ... 
Math(Help!!)
What is the domain? Use a graphing utility to determine the intervals in which the function is increasing and decreasing and approximate any relative maximum or minimun values of the function. g(x) = 12 Ln x / x My answer was: Domain = (12,0) decreasing = (3,2) and increasing... 
Math
What is the domain? Use a graphing utility to determine the intervals in which the function is increasing and decreasing and approximate any relative maximum or minimun values of the function. g(x) = 12 Ln x / x My answer was: Domain = (12,0) decreasing = (3,2) and increasing... 
calculus
a rectangular room is 20 ft by 12 ft by 8 ft. If the length is decreasing by 4 inches per minute, the width is decreasing by 5 inches per minute and the height remains constant, how fast is the volume changing after 2 minutes? 
Math (Calculus)
A spherical snowball is melting in such a way that its diameter is decreasing at rate of 0.3 cm/min. At what rate is the volume of the snowball decreasing when the diameter is 10 cm. Can someone help & explain how to solve this question? Please. 
Stats....plz help....
Rank the following data in increasing order and find the position and value of the 56th percentile. Please show all of your work. 0 1 6 8 9 9 8 6 3 1 0 9 How do i find the position and value of the 56th percentile?? 
algebra please ck.
joe wants to spend 70. dollars at most and has 60 cu inches of space left in his soldier's care package. candy costs $7 and takes up 3 cu inch of space phone cards cost $5. and take up 15 cu in. of space. Is this correct? if not please change it or tell me how ??? thanks ann 1... 
Calc
A spherical snowball is melting in such a way that its diameter is decreasing at rate of 0.4 cm/min. At what rate is the volume of the snowball decreasing when the diameter is 10 cm. (The answer is a positive number). 
Chemistry
Consider an ionic compound, MX2, composed of generic metal M and generic halogen X. The enthalphy of formation of MX2= 891. The enthalphy of sublimation of M= 141. The first and second ionization energies of M are 605 and 1392. The electron affinity of X= 339. The bond ... 
math analysis
how many faculty of each rank should be hired at each college to exactly meet the demand for sections and completely exhaust the salary budget Rank table. Lecture. Instrutor Section taught. 3. 4 annual salary. 20. 25 (Thousands $) Table. Community college 1. 2. 3 demand for ... 
Math(Please help)
What is the domain? Use a graphing utility to determine the intervals in which the function is increasing and decreasing and approximate any relative maximum or minimun values of the function. g(x) = 12 Ln x / x My answer was: Domain = (12,0) decreasing = (3,2) and increasing... 
**CHEM**
Arrange the following elements in order of decreasing atomic radius: Cs, Sb, S, Pb, Se *(list from largest to smallest...or..."the correct ranking cannot be determined") ***I think the answer 'should be', from largest to smallest: ***Cs, Pb, Sb, Se, S***???? Am I correct in my... 
economics
Hey can someone tell me how to graph this in excel please. Thanks. Produce a chart in Excel showing TC and TR with Q on the horizontal axis. Have Q go from 0 to 15,000 units. Produce a second chart showing MC and MR with Q again on the horizontal axis. Here is the problem for ...