Homework Help

Hello This will no doubt be a very basic question, but I had a question about the following, which is in my text book: REMEMBER ‘Oxidation Is Loss’ of electrons. The opposite of oxidation is reduction, so remember OIL RIG, ‘Oxidation Is Loss, Reduction Is Gain’ of electrons. Oxidation and reduction always occur together; such reactions are known as REDOX reactions. My question, as this is part of the "what oxygen can do to other compounds": are Redox reactions only related to oxygen or can they be any loss/gain of electrons? Thanks

Question: A non-living thing such as a rock does not grow.However, a crystal immersed in a saturated solution may increase in size. HOW IS THIS CHANGE DIFFERENT FROM THAT OF A LIVING ORGANISM? Topic characteristics of living things How can I give a proper answer? Should I talk about cells and tissue expansion as we eat??? Plz help me to sort this problem out and to give a proper definition!

The book says: The lift is at rest---> weight=mg The lift is moving up or down with uniform velocity---> weight=mg I understood this far. Now, it says that when the lift is accelerating uniformly a)upwards--->weight=m(g+a) b)downwards--->weight=m(g-a) My problem is: Why is it + in a) and - in b)? Thnx

pls am a final year student of computer science in diploma am having a little challenge with my project and d topic is BOOKSHOP MANAGEMENT AND ORDERING SYSTEM and am using VB10 to design it but at some point am having problem coding a button to update my database pls ur help will be really appreciated

Hi all, Is there someone who can explain to me how to convert floating point number and its binary representation into IEEE standard?? Thanks so much

I don't know if this is the right place where I can post my question. I'm studying computer architecture for an exam in September but I find some question in the program and I don't know how to answer to them. I tried to search on Internet but I did not find anything. The questions are: Given the number of sets, the number of lines per set, the number of words per line and the number of cells per word, draw the structure of a cache (show tags, valid bits and data structured in sets, lines, words and cells). Given the number of sets, the number of lines per set, the number of words per line and the number of cells per word, and assuming the LRU (least recentl…

Cu(s) + 2NO3-(aq) + 4H+(aq) -> Cu2+(aq) + 2NO2(g) + 2H2O(l) Which of the following takes place during the reaction above? A) Cu(s) is oxidized B)Cu(s) is reduced C)H+(aq) is oxidized D)H+(aq) is reduced E)NO3-(aq) is oxidized The answer is A, and I got it right, but the solution also said that NO3- is reduced, but I don't see how that's possible.Wouldn't it be oxidized if it's going from NO3- to NO2?

Hi guys so this is the problem I want to ask. For part A I got F=mg +k (deltax), And for part B I got P=Patm+F/A (F is from part A.) So part C is where I got confused. What does it mean by here quadratic equation? In my mind if the piston is allowed to reach equilibrium, the volume of the gas would change(in this case, double) and the pressure would maintain the same. But them I saw part D part E and so on and I got threw off. I have no idea how to approach part c. Please help!

please answer,show me how you got it and teach me how to get it thanks for boyle's law a. p1=2.5atm , v1=1.5L , p2=3.8atm , v2=? b. p1=2.0atm , v2=350mL , p2=750mmHg v2=? c. p1=75mmHg , v2=9.1 mL p2=? , v2=890mL Charles' Law a. v1=10.0mL , t1=210k , v2=? , t2=450k b. v1=255mL , t1=55*c , v2=? , t2=150k c. v1=13L , t1= -150*c , v2=52L , t2=? Gay-lussacs a. p1=1.74atm , t1=120*c , p2=? , t2=20*c b. p1=220mmHg , t1=150*c , p2=? , t2=300k c. p1=0.75atm , t1=198*c , p2=220mmHg t2=? it's not really homework just examples i saw in the book as i need to prepare for a quiz tomorrow morning. when this was discussed i was absent that's why not su…

The problem asks what is wrong with the name 3-ethyl-4,4,-dimethylhexane. Is ethyl supposed to be on carbon 4 and the two methyls on carbon 3? McMurry's text if there is a branch point occuring equidistant from both ends, begin counting from the end nearer the second branch point. In this case, both ends are still the same distance from the second branch point. Do I begin counting from the end closer to the higher branched carbon, the carbon with two methyls attached to it?

Let's say we have a pentane with an oxygen double bonded to carbon 2. Is that an acetyl functional group or a ketone? My organic chemistry book by McMurry doesn't list acetyl in the table of functional groups which orders them in the priority they have in the name. How do I prioritize an acetyl functional group when naming a compound?

Hello everyone Friday is part one of my maths exam.. One I can't seem to solve: [math]\int{e^{\sqrt{x}}dx}[/math] Could anyone help me? Thanks! F.

what cause the change in taste of beer when poured into the glass to the point when it was finished

Hello to all.. I have some homework to do but I haven't good thermodynamics background experience... The "translated homework is".. The compressor has a gass mas flow of 45 kg/min. on the entrance the specific enthalpy is 46 kJ/kg. On the exhaust the enthalpy is of 175 kJ/kg. Heat "dispersion" into the environment is 105 kJ/min. Define the engine power if the effiency is 75%... From this i have first defined the variables h1 = 46 kJ/kg h2= 175 kJ/kg Qod = 105 kJ/min = 0,75 kg/s ?? eff = 75% = 0,75 m= 45 kg/min = 0,75 kg/s ?? On some internet pages i have found that Power = m * (h2 - h1) and eff = P/Psteam Please let me know 1.) If the u…

Hey guys! I'm new here, so firstly- hello! I've a exercise to from Metrology. Evaluate measurement uncertainty for the following measurement: 1. Measurement quantity: length of a bar L = 500 mm 2. Material of the measuring object: steel 3. Temperature range in the measuring room: 14 to 26 °C 4. Measurement instrument: Micrometer; digital (resolution 0,001 mm) - Uncertainty of calibration: U = 2 µ m + 4 × 10-6 × L 5. Temperature difference between the measurement object and the measurement instrument:DT = 2 °C I have problem because I'm now on exchange, and this is my first time with Metrology. I didn't had any lectures, practice and etc. In internet I found a lot of …

What are the factors that make job shop a NP hard problem?

Not home work but does anyone know a formula for the volume of a torus and the surface area? I'm probably going to need to figure the force on the inside surface of a rotating torus as well so a formula for that would be helpful as well. I am pretty much restricted to algebra and geometry for math skills...

A capacitor loses half its charge every second. If after 5 seconds its charge is 'q', what was its initial charge?

Hello everyone! In preperation for my approval exam to med school: A sound source sends waves with a power of [math]100\text{ W}[/math]. The sound level, expressed in [math]\text{dB}[/math] at a distance of [math]10\text{ m}[/math] is: A. 139 B. 129 C. 109 D. 10 I tried to solve this like this: If [math]\left[i\right]=\text{Wm}^{-2}[/math], then [math]I=Px^{-2}[/math]: [math]I=100\text{ W}\cdot 100^{-1}\text{ m}^{-2}=1\text{ Wm}^{-2}[/math] [math]N=120+10\cdot\log{I}=120+10\cdot\log{1}=120\text{ dB}[/math] Clearly, this isn't right. Can someone help me? The answer should be C. Also tried to solve this by picking x² = 10²*pi, the result then w…

If more lamps are connected in series,what happens to the current in the power source? decreases or increases and why? please explain in detail Thanks in advance

Elements A and X combine to form the compound A3X2. If the electron-dot symbol of the neutral atom A shows two electrons, the number of electrons in this symbol for atom X must be 2 4 5 6 My initial answer would have been 3 because if each A has 2, and there are three of them, there would be 6 total for A, so you need 6 total for X, so each X would need 3, but that would not an option. So I just picked 5 because 3+5=8. 5 is the right answer, but why?

I'm supposed to determine products for the given set of reactions (A,B, C) CH2=CH-CH3 + HBr --> A A + H2S --> B B + CH3I --> C A is obviously 2-bromopropane, but what I'm unsure about is whether it will react with H2S in both substitution and elimination? If yes, would the resulting alkene (elimination product) react with CH3-I to form alkyl halide, whereas thiol (substitution product) would react to form sulfide?

Hello. I am a third year Medical Technology student. In our country, Phlebotomy is almost always done by the MedTechs. You can say that it is a very, very vital skill for me to learn. However, no matter how many times I've done it, I can't seem to get it right. Our class is using vacutainers and is currently working on the median cubital vein. While I have no problem locating the vein with my fingers, everytime I slide the needle in, no blood comes out when I finally insert the vacutainer tube. I always, always seem to be missing the vein. Is there any tips or tricksin hitting the veins? How would you know if you've already hit one? My uncle, an old student of Phy…

100 mL of 0.2 mol/L sodium carbonate solution and 200 mL of 0.1 mol/L calcium nitrate solution are mixed together. Calculate the mass of calcium carbonate that would precipitate and the concentration of the sodium nitrate solution that will be produced. Step 1: I wrote out the basic equation without balancing. Na2CO3(aq)+Ca(NO3)2(aq)----->CaCO3(s)+NaNO3(aq) Step 2: Balance. Na2CO3(aq)+Ca(NO3)2(aq)----->CaCO3(s)+2NaNO3(aq) Step 3: I wrote out my givens. Compound Na2CO3 Ca(NO3)2 Volume 0.1L 0.2L Conce…

Hello I was wondering whether anyone could help me. I have to answer the following question. I know that I'm probably missing a really simple calculation but I am struggling. Ecosystem Type- Desert Scrub Surface Area (106 km 2) 19.80 Mean Plant Biomass (kgC m-2) 0.175 Total Plant Biomass (1012 kgC) 3.47 Mean NPP (kgC m-2 yr-1) 0.032 Total NPP (1012kgC yr-1) ? I need to work out the total NPP