Friday

April 18, 2014

April 18, 2014

Total # Posts: 42

**algebra**

What is the equation for the line of best fit that matches the data shown in the table and in the graph? x y -7 9 -3 6 -1 3 2 1 6 -1 A. y = 0.79x - 3.12 B. y = -0.79x + 3.12 C. y = 3.12x - 0.79 D. y = -3.12x + 0.79 i can't show the graph here but it's basically a plot ...

**algebra**

thank you!

**algebra**

What is the equation of the line that is parallel to 8x - 5y = 2 and goes through the point (-5, -2) ? A. y = 8/5x + 6 B. y = 8/5x + 10 C. y = 8/5x - 6 D. y = 8/5x - 10 i'm guessing this would be D, or possibly B.

**Calculus**

A cup of hot chocolate has temperature 80 C in a room kept at 20 C.? After a half hour the hot chocolate cools to 60 C. a) what is the temperature of the hot chocolate after another half hour? b) when will the chocolate have cooled to 40 C? I think I know how to do b, I'm ...

**Calculus**

I did it by multiplying by the conjugate. I'm not sure of how to do it any other way. Can you explain how that works?

**Calculus**

What is the limit (as u--->2) of square root(4u+1)-3/u-2. I got 1 as an answer, but I want to check if that's right. I heard it could be something else so I'm unsure and doubtful of my answer.

**Chemistry**

Rank the given compounds based on their relative Brønsted acidities. H-I, H-F, H-SH, H-NH2, H-CH3. I thought it correlated with whichever element was more electronegative was also more acidic. An explanation would be much appreciated.

**Calculus**

Find a number, delta, such that if |x-2|<delta, then |4x-8|<0.1 I don't have a clue how to begin this. My teacher just started off the lesson with this without any explanation so I am at a loss. A step-by-step explanation would be very much appreciated!!

**Chemistry**

Acetylene, C2H2, can be converted to ethane, C2H6, by a process known as hydrogenation. The reaction is: C2H2(g) + 2H2(g) === C2H6(g) Given the following, what is the Kp for the reaction? C2H2(g): 209.2 ΔG˚f (kJ/mol) H2(g): 0 ΔG˚f (kJ/mol) C2H6(g): -32.89&...

**Chemistry**

The value of Kc for the reaction below is 1.6 C(s)+CO2(g)=2CO(g) What is the equilibrium concentration of CO when [CO2]=.50M? The usual ICE table doesn't work for me. C(s)+CO2(g)=2CO(g) I - 0 C -x +2x E .50 +2x 1.6=[2x]^(2)/(.50) That's how I did it but the answer is ....

**Chemistry**

The solubility of iron(III)hydroxide is 4.39E-10M. What is the Ksp for this compound? I don't know how I would go about this problem.

**physics**

u=0.5*qv u=0.5*25*100 u=1250

**Chemistry**

Could you provide more explanation as to where those numbers came from?

**Chemistry**

Nitrogen and hydrogen gases react to form ammonis gas as follows: N2(g)+3H2(g)-->2NH3(g) At a certain temperature and pressure, 1.2L of N2 reacts with 3.6L of H2. If all the N2 and H2 are consumed, what volume of NH3 at the same temperature and pressure will be produced? I&...

**Chemistry**

Never mind, I got it.

**Chemistry**

Which do not obey the octet rule? Check all that apply. NO BF3 ICl2^- OPBr3 XeF4 An explanation would be appreciated, thanks.

**Chemistry**

How would I go about creating a Lewis Dot structure for the Calcium Carbonate and Magnesium Hydroxide? I know how to do it for any compound with two elements such as SF5, but I don't know how to approach it when there's a polyatomic ion involved and there are three ele...

**Chemistry**

I'm still not quite sure how you were able to figure that out.

**Chemistry**

What is the maximum number of electrons in an atom that can have the following quantum numbers? n= 4 ml= -3 ms= +1/2 How would you figure that out given those information? What's the process of that?

**Chemistry**

Part B: Use the result from part A, data in this chapter (Chapter 7:Periodic Properties of the Elements), and Hess's law to calculate the enthalpy of the above reaction. Part A is: Na(g)--> Na^(+)+e^(-) Cl(g)+ e^(-)--> Cl^(-)(g)

**Chemistry**

Consider the gas-phase transfer of an electron from a sodium atom to a chlorine atom: Na(g)+Cl(g)-->Na^(+)(g)+Cl^(-)(g) I was able to write the reaction that relates to an ionization energy and that relates to an electron affinity. I broke it up into: Na(g)--> Na^(+)+e^(...

**Chemistry**

Thanks so much, that really helped me understand it.

**Chemistry**

Nitrogen & hydrogen goes react to form ammonia gas as follows: N2(g)+3H2(g)-->2NH3(g) At a certain temperature & pressure, 1.2L of N2 reacts with 3.6L of H2. If all the N2 and H2 are consumed, what volume of NH3, at the same temperature & pressure will be produced? I tried ...

**Chemistry**

Thanks so much, that really helped me solve other problems.

**Chemistry**

In the ground-state electron configuration of Fe^{3+}, how many unpaired electrons are present? An explanation would be great, thanks.

**Evolutionary Bio**

I was wondering if someone could explain to me how two haploid mating types can form a diploid. Also could someone explain the haplodiplontic life cycle? I would very much appreciate it.

**Chemistry**

What is the zeff value for a valence electron in an oxygen atom? An explanation would be much appreciated.

**Chem**

Yeah, I ended up getting it. It was a calculation error and I got the equations as well; I had to have two with the phases. Thanks.

**Chem**

Still got it wrong. I converted from tons to grams, still no good.

**Chem**

Ah, ok. Thanks for all the help.

**Chem**

So I followed that and got 168.58 and I put it as a scientific notation since it wanted only two sigfigs (1.7E2, I had to round as well), but it was wrong.

**Chem**

I tried to convert the tons to grams and got 7.2E7, but that ended up being wrong. I also need a balanced equation.

**Chem**

A particular coal contains 2.5% sulfur by mass. When this coal is burned, the sulfur is converted into sulfur dioxide gas. The sulfur dioxide reacts with calcium oxide to form solid calcium sulfite. If the coal is burned in a power plant that uses 1800 tons of coal per day, wh...

**Chem**

Could you show me step-by-step how to find the limiting reagent? That's the part I get a little confused in.

**Chem**

Solutions of sodium carbonate and silver nitrate react to form solid silver carbonate and a solution of sodium nitrate. A solution containing 3.30 g of sodium carbonate is mixed with one containing 3.00 g of silver nitrate. How many grams of each of the following compounds are...

**Chem**

I got the answer (210grams). Thanks.

**Chem**

Just to clarify, when I convert from moles to grams, do I double Fe because it has the coefficient 2?

**Chem**

Yeah, I balanced it already; I put it up. My teacher didn't do this, that's why I didn't know how to start, but is that pretty much all I have to do? That extra multiplication/division?

**Chem**

Calculate the number of grams of Fe formed when 0.300kg of Fe2O3 reacts. Equation: Fe2O3+CO-->Fe+CO2 converted .300kg to 300g Balanced Fe2O3+3CO-->2Fe+3CO2 So I started by trying this: 300gFe2O3(1molFe2O3/159.687gFe2O3)...and then I don't know where I would go from t...

**Chem**

Yeah it was that last digit that threw me off. Thanks for the help. I rounded early so the calculation came out different.

**Chem**

How many moles of ammonium ions are in 8.794g of ammonium carbonate? I got .1832 as an answer and I was told that I was very close and I just may have done some kind sigfig or calculation error but I have no idea what it is since I did this problem so many times only to get th...

**Unit of Inquiry**

I am a 5th grade student and my group has to research this question. I have to turn it in tomorrow and was given the assignment today. I am stuck can you please help? Thanks The question is: Why do people make things that ruin the environment?

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