Rank the crystal lattice structures in order of decreasing efficiency of space in the structure.
20,916 results, page 4

Chemistry
Can someone explain hybrid structures and resonance structures. 
algeba
if a student's rank in a class of 400 students is 44 find the student's percentile rank. 
PHYSICS
NEED HELP ON THE ANSWER OF THIS PROBLEM THE EFFICIENCY OF THE PULLEY DECREASES WITH A COEFFICIENT OF FRICTION OF 2.0 THE EFFICIENCY OF THE PULLEY IS 60% WHAT WOULD YOU EXPECT THE EFFICIENCY TO BE IF THE COEFFICIENT OF FRICTION INCREASED TO 0.3 
chemistrylattice energy
Determine the lattice energy for CaBr2 if the enthalpy of solution for CaBr2 is 145 kJ/mol, and the heats of hydration for Ca2+ and Br are 1650 kJ/mol and 292 kJ/mol respectively. 
Math
Without using technology, rank these logarithms in order from least to greatest: log₄62,log₆36,log₃10,log₅20. I'm not sure how to do this question because the bases are different. Thanks! 
computers
can the linear nested IF/ENDIF structures can contain other decision or looping structures inside their code block 
Science
How do the structures of organisms compare and contrast to nonliving structures like construction cranes,ships,airplanes or bridges? 
algebra
if a student rank in a class 400 is 87 waht id the student percentile rank 
Maths algebra
The efficiency of an industrial pump decreases by a fixed percentage each year. The percentage decrease each year is with respect to the efficiency of the pump at the start of each year. Over each four year period, the efficiency decreases by 80%. Let us write e = f(t) so that... 
Chemistry
You are conducting experiments with your xray diffractometer. (a) A specimen of molybdenum is exposed to a beam of monochromatic xrays of wavelength set by the Kα line of silver. Calculate the value of the smallest Bragg angle, θhkl, at which you can expect to ... 
Water treatment
If the RQ is 6 and the k2t is 4, what is the removal efficiency of (CO2) of the cocurrent tower aerator. What will be the efficiency if a tower aeration with counter current flow is used instead? what is the efficiency of the cocurrent tower aerator (%): what is the ... 
earth
Six artificial satellites complete one circular orbit around a space station in the same amount of time. Each satellite has mass m and radius of orbit L. The satellites fire rockets that provide the force needed to maintain a circular orbit around the space station. The ... 
Chemistry
rank the following atoms and ions in the order of expected increasing radius: Ca, Ca2+, Ar Pls pls help me kindly... Anyone? 
chem
Rank the size of a change in temperature of one degree Fahrenheit, one degree Celsius, and one kelvin. In other words, if a thermometer were to show that the temperature outside increased by these amounts, which change would feel the largest? If any of the options are the same... 
CHEMISTRY
Rank the following complex ions in order of increasing wavelength of light absorbed. (Use the appropriate <, =, or > symbol to separate substances in the list.) Co(H2O)63+, Co(CN)63, CoI63, Co(en)33+ 
CHEMISTRY
Rank the following complex ions in order of increasing wavelength of light absorbed. (Use the appropriate <, =, or > symbol to separate substances in the list.) Co(H2O)63+, Co(CN)63, CoI63, Co(en)33+ 
Economics
Rank in order from best to worst, the economic systems(command, market and mixed) according to which, in theory, best attempts to meet the conditions of The Human Development Index. Why did you rank them this way. I am thinking (in theory): 1command 2mixed 3market The The ... 
chemistry
Based on position in the periodic table and electron configuration, arrange these elements in order of decreasing E_ i1 
chemistry
A, B, C, and D are 4 salts whose Ksp values are 9.21 × 108, 7.44 × 1011, 1.07 × 1021, and 38.65, respectively. What is the correct arrangement of their solubilities in decreasing order? A. D, A, B, C B. C, B, A, D C. A, B, D, C D. C, B, D, A 
Physics/Math
Determine the missing value. a) Output value/Efficiency: 100 J Efficiency: 100% Input E = ??? b) Input: 100 J Efficiency: 30% Output E = ?? Output= 30 J c) Output E: 120 000 J Efficiency: 2% Input E= ?? How would I solve for the put value? Thank you! 
Chemistry
Can someone check to see if my answers look ok. For the following crystals, explain how their melting points are related to the bonding forces and the crystal structure: a)Copper,Cu Copper has metallic bonds between atoms. It can occur as isometric cubic and octahedral ... 
English
Which of the following organizational patterns would be most effective for writing about the benefits of continuing government assistance for the U.S. space program? (1 point) chronological order order of importance compare and contrast argument and support< 
Child Development
Rank the perspectives of language development in order of importance. Explain why you feel your first choice is the most important. 
child development
Rank the perspectives of language development in order of importance. Explain why you feel your first choice is the most important. 
Math
Rank the following data in increasing order and find the positions and values of both the 39th percentile and 67th percentile. 5 9 9 0 7 2 5 6 9 1 0 6 
Science
How do structures in living organisms compare with structures of nonliving things such as construction cranes, buildings, ships, airplanes, or bridges? 
Maths please someone help me out!!!
3. The efficiency of an industrial pump decreases by a fixed percentage each year. The percentage decrease each year is with respect to the efficiency of the pump at the start of each year. Over each four year period, the efficiency decreases by 80%. Let us write e = f(t) so ... 
Algebra
Im having a hard time figuring out this problem: Use the function, y=(x+1)^2 +2, to answer the following parts. The increasing interval and decreasing interval To find both I believe that: increasing : x < 1 decreasing : x > 1 So is this on solution below Increasing ... 
Chemistry
The estimated lattice energy for is CsF2+2347kj/mol. Use the data given to calculate an overall energy change (in kilojoules per mole) for the formation of from its elements. Ea for F = 328 E11 forCs = +375.7 E12 for Cs = +2422 Heat of sublimation for Cs = 76.1 Bond ... 
Chemistry
I don't understand this question and answer can someone help me? In order to exhibit delocalized pi bonding, a molecule must have . At least resonance 2 resonance structures. & In comparing the same two atoms bonded together, the greater the bond order, the shorter the bond ... 
chemistry
Draw one of the Lewis structure of the N2O5. In each case one oxygen bridges the nitrogens (NON single bond) and 2 other oxygens are bonded to each N. How many equivalent resonance structures are there that satisfy the octet rule and where O makes at most 2 bonds? 
chemistry
Draw one of the Lewis structure of the N2O5. In each case one oxygen bridges the nitrogens (NON single bond) and 2 other oxygens are bonded to each N. How many equivalent resonance structures are there that satisfy the octet rule and where O makes at most 2 bonds? 
chemistry
A chemical analysis indicates that a silicon crystal weighing 100g contains 16.5 mg of aluminum (Al) which is substitutionally incorporated (the Al atoms replace some of the Si atoms). What is the number of extrinsic charge carriers in this crystal? Express your answer as ... 
chem
Determine the electron and molecular geometries of each of the following molecules. For those with more than one central atom, indicate the geometry about each central atom. (Enter your answers in the order given in the skeletal structure from left to right.) CH3OH (skeletal ... 
Chemistry
If the RQ is 6 and the k2t is 4, what is the removal efficiency of (CO2) of the cocurrent tower aerator. What will be the efficiency if a tower aeration with counter current flow is used instead? what is the efficiency of the cocurrent tower aerator (%): what is the ... 
biology
I need help finding diagrams of the leaf structure, stem structure and root structure of a lilac flower with explanations. Sites would help 
Physics help please!
The engine has an efficiency e1. The engine takes input heat Qh from a hot reservoir and delivers work W1. The heat rejected by this engine is used as input heat for a second engine, which has an efficiency e2 and delivers work W2. The overall efficiency of the twoengine ... 
7th grade Life Science
Which of the following structures does not provide support for invertebrae bodies? a)backbone b)tiny glass structures c)skin d)exoskeleton 
Science
Karen is studying types of spacecraft. Which of these spacecraft can people use to travel to and from orbits close to Earth? A)space probe B)space shuttle C)space station D)space telescope I think the answer is C. 
Physics
The interatomic spacing in a crystal of table salt is 0.281 nm. This crystal is being studied in a neutron diffraction experiment, similar to the one that produced the photograph in the figure. How fast must a neutron (mass = 1.67 x 10^27 kg) be moving to have a de Broglie ... 
linear algebra
which of the following sets of vectors span R^3? a.){(1, 1, 2), (0, 1, 1)} b.) {1, 2, 1), (6, ,3, 0), (4, 1, 2), (2, 5, 4)} c.) {(2, 2, 3), (1, 2, 1), (0, 1, 0)} d.) {(1, 0, 0), (0, 1, 0), (0, 0, 1), (1, 1, 1)} can someone show the steps to check for one of them and i ... 
Chemistry
Choose the true statements regarding the chargeminimized Lewis structure(s) of the BrO2 ion. (selet all that apply) a. There is only one chargeminimized structure for this ion. b. There are two chargeminimized resonance structures for this ion. c. The formal charge on the ... 
Anatomy & Physiology
Although all of the structures of the respiratory system are in contact with the circulatory system, which respiratory structure is most closely associated with dense network of capillaries? A. pharynx B. vocal folds C. trachea D. alveoli 
chemistry
a hydrated salt is a solid that includes water molecules within its crystal structure. a student heated a 9.10gram sample of a hydrated salt to a constant mass of 5.41 grams. what percent by mass of water did the salt contain? 
Chemistry
A scintillation counter detects radioactivity by: A) none of the answers. B) emission of light from a NaI crystal when radioactivity passes through the crystal. C) ionization of argon gas in a chamber which produces an electrical signal. D) analyzing the mass and velocity of ... 
Algebra II Please help
Assign each letter and a blank space to a number as shown by the alphabet table. 0=_ 1=A 2=B 3=C 4=D 5=E 6=F 7=G 8=H 9=I 10=J 11=K 12=L 13=M 14=N 15=O 16=P 17=Q 18=R 19=S 20=T 21=U 22=V 23=W 24=X 25=Y 26=Z use matrix [1 2] 3 7 and encode the phrase "One Question to go" o=15 ... 
chem
Arrange the following amines in order of decreasing base strength. NH3, NH2Br, CH3NH2, (CH3)2NH 
Chemistry
Arrange the following ions (Cu^2+. Zn^2+, Al^3+, and Mg^2+) in order of decreasing ability to be reduced. Could someone check my answer and see if it is right? Thanks Cu^2+ > Zn^2+ > Al ^3+ > Mg ^ 2+ 
chemistry
How do you arrange these aqueous solutions in order of decreasing freezing point: 0.10 m Na3PO4, 0.35 m NaCl, 0.20 m MgCl2, 0.15 m C6H12O6, and CH3OOH? 
Chemistry
Arrange the following cations in order of decreasing size :Ra2+,Sr2+,Ca2+,Ba2+.Also explain it. 
engineering science
A ramjet is to propel an aircraft at Mach 3 at high altitude where the ambient pressure is 8.5 kPaand the ambient temperature Tnode is 220 K. The turbine inlet temperature T is 2540 K. If all components of the engine are ideal  that is, frictionless  determine (a) the ... 
linear algebra
Determine whether {v1, v2, v3} is a basis for R3 v1 = [1] [3] [1] v2 = [3] [8] [4] v3 = [2] [2] [2] Put the vectors as rows or columns in a matrix and perform Gaussian reduction to determne the row or column rank. In this case you should find that the rank is 3, therefore ... 
Physics
A beam of Xrays with a wavelength ƒÜ of 0.179nm is directed at an iron crystal whose planes have a spacing of 0.1013nm. How many diffraction peaks (each arising from a different order n) are possible? I'm really not sure how to go about solving this. Any help is appreciated... 
AP Chemistry
Which action(s) will decrease the equilibrium concentration of a nonreacting gas in water? 1. decreasing the temp. of the water 2. decreasing the volume of water 3. decreasing the pressure of the gas above the liquid a. 1 only b. 2 only c. 3 only d. 1 and 3 e. 1, 2, and 3 
Biology (bobpursley)
1) Describe how comparing the anatomy of living species provides evidence of evolution. A: Comparisons of the anatomy of different types of organisms often reveal basic similarities in body structures even though the structure's functions may differ between organisms. For ... 
Chemistry
List SOF2, SO2F, and S2O3^2 in order of increasing sulfurtooxygen bond length. How do u tell by just looking at the Lewis structures? 
CHEMISTRY
You are conducting experiments with your xray diffractometer. (a) A specimen of molybdenum is exposed to a beam of monochromatic xrays of wavelength set by the Kα line of silver. Calculate the value of the smallest Bragg angle, θhkl, at which you can expect to ... 
CHEMISTRY
You are conducting experiments with your xray diffractometer. (a) A specimen of molybdenum is exposed to a beam of monochromatic xrays of wavelength set by the Kα line of silver. Calculate the value of the smallest Bragg angle, θhkl, at which you can expect to ... 
Physics
Engineers are trying to create artificial "gravity" in a ringshaped space station by spinning it like a centrifuge. The ring is 170 m in radius. How quickly must the space station turn in order to give the astronauts inside it apparent weights equal to their real weights at ... 
physics
Engineers are trying to create artificial "gravity" in a ringshaped space station by spinning it like a centrifuge. The ring is 120 m in radius. How quickly must the space station turn in order to give the astronauts inside it apparent weights equal to their real weights at ... 
Chem
Pure gold adopts a facecentered cubic crystal structure. It also has a density of 19.30g/mL. What is the edge length of gold's unit cell? What is the atomic radius of gold? I understand how to do this problem the other way: when you have the unit cell and are looking for the ... 
Health
can you please check my answer thanks True or False The purpose of a contrast medium is to allow direct visualization of internal organs and structures. I said true tho to make a particular structure visible on a radiograph crossed my mind my text book is not that clear 
matrices
Let A be a 5 by 4 matris and suppose that the system Ax=b has a solution. Explain why the solution is unique if and only if the rank of A is 4. I said that it is unique becaue the rank is equal to the number of columns. Do you have a better explaination. 
chemistry
Place these hydrocarbons in order of decreasing boiling point: paraffin : methane: octane: isooctane: ( also known as 2,2,4 trimethylpentane) octadecane: 
science
name one example each of a solid, liquid and a gas. arrange them in the decreasing order or the kinetic energy possessed by the particles in them 
Chemistry
Place the following elements in order of decreasing atomic size: selenium, chlorine, fluorine, rubidium, calcium, and sulfur. 
Chemistry
Place the following elements in order of decreasing atomic size: selenium, chlorine, fluorine, rubidium, calcium, and sulfur. 
Math
Can someone please help me with these three question? I having a very difficlut time answering them May first question To select a _________ sample, the population is divided into disjoint subgroups according to some characteristics like income level, and then a few ... 
Chemistry
Draw the Lewis structures for BrO3 and ClO4 and indicate their correct number of additional resonance structures. I'm a little confused about this. For example, I've got the correct original form of BrO3 down. Where all 3 O atoms are single bonded to Br, and the Br itself ... 
English
1. May I take your order? 2. Would you like to order now? 3. Will you order? 4. Order, please. 5. Please order your food. 6. Are you ready to order? 7. Do you want to order? 8. Why don't you order? 9. How about ordering? 10. What do you think of ordering? (In a restaurant, can... 
L.A
1. In a persuasive essay, the thesis statement should represent an opinion. A. True < B. False 2. The most common structure of a persuasive essay is A. Order of importance B. Chronological order < C. Problem and solution 3. Which of the following is NOT a sentence A... 
class rank
what does the class rank 1 out of 120 mean? 
Physics (Gravitation)
2. To leave the gravitational ﬁeld of a planet, a space rocket must be launched at an escape velocity of: ve =r2GM r , where G is the gravitational constant G ¡Ö 6.8¡Á10−11Nm2/kg2, M is the mass of the planet and r is its radius. Suppose that we want to land a... 
chemistry
You are conducting experiments with your xray diffractometer. (a) A specimen of molybdenum is exposed to a beam of monochromatic xrays of wavelength set by the Kα line of silver. Calculate the value of the smallest Bragg angle, θhkl, at which you can expect to ... 
child development
Rank the perspectives of language development in order of importance. Explain why you feel your first choice is the most important. this is the question that i submitted to you I wantedto know what you mean by study them. 
physics
Two small stereo speakers A and B that are 1.40m apart are sending out sound of wavelength 33.5cm in all directions and all in phase. A person at point P starts out equidistant from both speakers and walks (see the figure (Figure 1) ) so that he is always 1.50m from speaker B... 
chemistry
what transition metal complex is responsible for transporting oxygen in our blood? Also, what is its structure? The transition metal (there are several transition seriesI assume you are referring to the 3d transition metals) is iron. As to its sturcure, the iron itself has ... 
Physics
Engineers are trying to create artificial "gravity" in a ringshaped space station by spinning it like a centrifuge. The ring is 100m in radius. How quickly must the space station turn in order to give the astronauts inside it weights equal to their weights at the earth's ... 
Physics
Engineers are trying to create artificial "gravity" in a ringshaped space station by spinning it like a centrifuge. The ring is 100m in radius. How quickly must the space station turn in order to give the astronauts inside it weights equal to their weights at the earth's ... 
History
Almost all governments include four major power structures that assist in the running of the state. Define these structures and discuss how they evolved and their importance to the stability of governmental authority. 
Chemisty Please Help
The instructions are, Write Lewis structures that obey the octet rule for the following species. (Assign atomic charges where appropriate.) 1) XeO4 2) CIO^4 3) PO4^3 Would I just draw them in a different way or just the regular Lewis Structure? 
Science
Study the image of the fossil shown below. How might a scientist use this fossil to learn more about the history of life on Earth? connexus dot com/content/media/917517416201372829PM1012149111.jpg to compare structures in the fossil with homologous structures in other ... 
Science
Which of the following must be true of the structures of axons and muscle cells in order for nerve impulses to stimulate muscle contraction? A. Axons in muscle cells must both have structures that make in secrete the same molecules B. Axons in muscle cells must both have ... 
chemistry
Chemical analysis of a silicon crystal reveals gallium at a level of atomic percent. Assuming that the concentration of thermally excited charge carriers from the Si matrix is negligible, what is the density of free charge carriers (free carriers/cm3) in this Si crystal? 
space/astronomy
Rank the objects based on the strength of the gravitational force that would be felt by a spacecraft traveling at a distance of 10 AU from the center of each of the objects, from weakest to strongest. 1)red giant mass: 1Msun radius: 100Rsun 2)sun 3)white dwarf mass: 1msun ... 
Chem
Which molecule is not polar (possesses no net dipole)? Option 1. acetone [Marvin structure] Option 2. cisdichloroethene [Marvin structure] Option 3. methylbromide [Marvin structure] Option 4. transdichloroethene [Marvin structure] Option 5. dibromomethane [Marvin structure] 
MATH
A lattice point is a point with integer coordinates. How many lattice points $(x,y)$ with $100\le x\le 100$ and $100\le y\le 100$ are on the graph of the parametric equations \begin{align*} x&=3040\cos t,\\ y&=50 + 30\cos t? \end{align*} 
Algebra
The table shows the relationship between the number of players on a team and the minutes each player gets to play Players Minutes 7 35 8 30 9 25 10 20 Is the relationship a function that is decreasing or increasing; is the relationship a functions that is linear or nonlinear ... 
Biology
Need help with this one: c)The cytoskeleton of eukaryotes serves many functions. One of these functions is served in prokaryotes by a different major structure. Which structural feature is it? How do these different structures serve the same function in the two cell types? ... 
PHYSICS  PLEASE HELP
Converting sunlight to electricity with solar cells has an efficiency of 15%. It's possible to achieve a higher efficiency (though currently at higher cost) by using concentrated sunlight as the hot reservoir of a heat engine. Each dish in the figure concentrates sunlight on ... 
calculus
h(x)= x + cos(ax), where a is a positive constant such that 0 < a < 4. What values of a make h(x) strictly decreasing? I know h'(x) has to be less than zero for h(x) to be decreasing and h'(x) = 1asin(ax). I'm not sure where to go from here... 
Chemistry
Chemical analysis of a germanium crystal reveals indium at a level of 0.0003091 atomic percent. Assuming that the concentration of thermally excited charge carriers from the Ge matrix is negligible, what is the density of free charge carriers (free carriers/cm3) in this Ge ... 
chemistry
Chemical analysis of a germanium crystal reveals indium at a level of 0.03091 atomic percent. Assuming that the concentration of thermally excited charge carriers from the Ge matrix is negligible, what is the density of free charge carriers (free carriers/cm3) in this Ge crystal? 
Chemistry
Chemical analysis of a silicon crystal reveals gallium at a level of 3.091X10^2 atomic percent. Assuming that the concentration of thermally excited charge carriers from the Si matrix is negligible, what is the density of free charge carriers (free carriers/cm3) in this Si ... 
chemistry
Chemical analysis of a silicon crystal reveals gallium at a level of 3.091*10^7 atomic percent. Assuming that the concentration of thermally excited charge carriers from the Si matrix is negligible, what is the density of free charge carriers (free carriers/cm3) in this Si ... 
Chemistry
Chemical analysis of a germanium crystal reveals indium at a level of 0.0003091 atomic percent. Assuming that the concentration of thermally excited charge carriers from the Ge matrix is negligible, what is the density of free charge carriers (free carriers/cm3) in this Ge ... 
chemistry
Chemical analysis of a germanium crystal reveals indium at a level of 0.0003091 atomic percent. Assuming that the concentration of thermally excited charge carriers from the Ge matrix is negligible, what is the density of free charge carriers (free carriers/cm3 ) in this Ge ... 
AP Statistics
Suppose a Normal model describes the fuel efficiency of cars currently registered on your state. The mean is 24 mpg, with a standard deviation of 6 mpg. Describe the fuel efficiency of the worst 20% of all cars. I know that you convert 20% into decimal form to get .2 and put ... 
chemistry
Chemical analysis of a silicon crystal reveals gallium at a level of 3.091×10−4 atomic percent. Assuming that the concentration of thermally excited charge carriers from the Si matrix is negligible, what is the density of free charge carriers (free carriers/cm3) in this... 
Chemistry
Chemical analysis of a silicon crystal reveals gallium at a level of 3.091×10−4 atomic percent. Assuming that the concentration of thermally excited charge carriers from the Si matrix is negligible, what is the density of free charge carriers (free carriers/cm3) in this...