Monday

April 21, 2014

April 21, 2014

Total # Posts: 77

**Chemistry**

What mass of lithium (in g) is required to react completely with 57.5mL of N2 gas at STP? Lithium reacts with nitrogen gas according to the following reaction: 6Li(s)+N2(g)→2Li3N(s)

**Chemistry**

Consider the following balanced equation: 2N2H4(g)+N2O4(g)→3N2(g)+4H2O(g) Complete the following table showing the appropriate number of moles of reactants and products. If the number of moles of a reactant is provided, fill in the required amount of the other reactant, ...

**Algebra!**

(1) A business shipped 108 packages one day. Customers are charged $3.50 for each standard-delivery package and $7.50 for each express-delivery package. Total shipping charges for the day were $506.00. How many of each kind of package were shipped? Standard: Express: (2) A dep...

**Algebra!**

(1) A business shipped 108 packages one day. Customers are charged $3.50 for each standard-delivery package and $7.50 for each express-delivery package. Total shipping charges for the day were $506.00. How many of each kind of package were shipped? Standard: Express: (2) A dep...

**Physics**

A 75 kg skier starts at rest on top of a icy inclined plane (with a 30 degree angle to the ground). He ends up going past the inclined plane and onto a flat ground. And comes to a rest. The coefficient of friction is .100. How long does it take for the skier to go from rest (a...

**financial litercy **

a sales manager has weekends off and 20 paid vacation days per year, including holidays that fall on weekdays. if her salary is $93,600 per year, what is her pay per weekday?

**chemistry**

Calculate the change in entropy (ΔS˚) of reaction (J/K) for the equation as written. BaCO3(s) → BaO(s) + CO2(g) Table: S° (J/(K mol)) BaCO3(s) = 112 BaO(s) = 70.3 CO2(g) = 213.7 So the answer is -41.7 I thought to find the entropy of reaction you subract th...

**Science**

What vocabulary term causes iron to rust

**calculus**

Find critical points of f, and the extrema of f on the given interval. a)f(x) = x^4-10x^2; [0,3] b)f(x) = (x/e^x); [0,2]

**math**

1/3 + 5/14 divided by 5/7 Any help?

**chemistry**

a 1.00g sample of water is allowed to vaporize completely in a 10.0L container. What is the pressure of the water vapor at 150 degrees celsius?

**physics**

A boulder in a river has weight of 65N. It displaces a volume of water with a weight of 10N. Which is the net force on this rock? 55 N down 65 N down 75 N up 75 N down

**Math**

Verify the identities by transforming the left-hand side into the right-hand side. Show work. (tan^2X)/(1-cos^2x)= sec^2x HELP

**math**

-infinity < n < 4

**trig**

Let P be the point on the unit circle U that corresponds to t. Find the coordinates of P and the exact values of the trigonometric functions of t whenever possible. 2pi 3pi/4 5pi/6 Three questions. I think those are supposed to be t.

**physics**

There's an easy formula to figure out how fast something will be at the end of a fall. Square root of (2gh). Mass isn't even involved Sq.Rt.(2 x 9.8 x 2) Sq.Rt.(39.2) 6.26 m/s

**Science**

It would be greater on both bodies as gravity is inversely proportional to distance.

**Science**

The earth would go in a straight line tangent to it's current rotation of the sun as the sun is no longer pulling it in causing the elliptical in the earths rotation. Without the gravity pulling it in, the earth would simply go flying off into space.

**math**

2^2+3^2=4^2 4+9=16 13=16 No, they could not be the side lengths of a right triangle because they are not correct in the Pythagorean theorem.

**trig**

If csc theta = 2, then what is theta approximated to 4 decimal points? RADIANS

**Math**

Andre gets 62 marbles and Don gets 124 marbles.

**Physics**

Relative Density = Weight in water/Loss of weight in water 13/7= 1.86 12/8= 1.5 That's the relative density of each according to oil and water, but I'm not sure how to find the same number for both unless you just average them, then it would be 1.68.

**Physics**

That's in Newtons.

**Physics**

Buoyant Force = weight of displaced liquid. 4cm^3= 0.000004m^3 0.000004x1030x9.8 = Buoyant Force 4.0E-2 = Buoyant Force

**English**

Yeah i also do connections. 10th grade. In September of 2012 i went to the beach for a week. it is now almost christmas and i still am trying to get caught up. weve been on break foralmost a week. this is so stressful. People think its easy because were home. NOOOOOOOOOOOOO!!!...

**4th grade math**

how do I find the mean of 92;96;99;103;88

**Math**

Kevin has a rabbit, a ferret, a gerbil and a turtle. He feeds them in a different order each day. In how many different orders can Kevin feed his pets?

**Trigonometry help**

If sin(x) = 1/3 and sec(y) = 13/12 , where x and y lie between 0 and π/2, evaluate the expression using trigonometric identities. (Enter an exact answer.) sin(x + y)

**cal**

If sin(x) = 1/3 and sec(y) = 13/12 , where x and y lie between 0 and π/2, evaluate the expression using trigonometric identities. (Enter an exact answer.) sin(x + y)

**u.s history**

What type of change did franklin d. Roosevelt bring?

**Literature/The Crucible**

Because proctor did not know the 6th commandment, then what happen?

**Chemistry**

When 0.526 L of Ar at 1.20 atm and 227°C is mixed with 0.270 L of O2 at 501 torr and 127°C in a 400. mL flask at 27°C, what is the pressure in the flask?

**Chemistry**

I got it. Thank you so much.

**Chemistry**

So, how do I get the grams ? Thank you.

**Chemistry**

1. A small piece of zinc reacts with dilute HCl to form H2, which is collected over water at 16°C into a large flask. The total pressure is adjusted to barometric pressure (752 torr), and the volume is 1538 mL. Use Table 5.2 to help calculate the partial pressure and mass ...

**criminal justice**

how do defense attorneys deal with the moral dilemma of representing people they know are guilty?

**HISTORY**

Why should a political system be unitary, federal, or confederal? If the U.S. were to have another constitutional convention, would we keep a federal system or change it?

**English-literature**

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**social studies**

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**chemistry**

What will happen to the volume of a gas in a closed container if you increase the external pressure when the temperature remains constant?

**math**

Use linear combinations to solve the system 3x − y = −4 −6x + y = 34 The value of x is The value of y is

**math**

A passenger in an airplane flying at an alti- tude of 14 kilometers sees two towns directly to the left of the plane. The angles of depres- sion to the towns are 30◦ and 52◦. How far apart are the towns? Answer in units of ft.

**Biology and Graphing (Stats)**

i need to make a graph on excel.. my data involve putting goldfish (from the same tank and same type) into 3 different environments : acidic, neutral (control), and basic. What kind of graph should I use? just a line graph? but then what should my variables look like? the 3 sa...

**math story problems**

Petra bought gasoline when the odometer read 15,345.4. After the next filling, the odometer read 15665.6. It took 13.4 gal to fill the tank. a) How many miles did she drive? b) How many miles per gallon (mpg) did the car get?

**MATH**

a) Multiply and simplify using fractions 3 5 - * - 5 7 b)Convert your answer to a decimal. thank you for the help.

**Career**

and hair salons

**chemistry**

I need help with a

**chemistry**

What is the acid and base whose reaction will produce the salt Na3PO4? What is the acid and base whose reaction will produce the salt PbS? What is the acid and base whose reaction will produce the salt KIO3? phosphoric acid, sodum hydroxide lead hydroxide, H2S potassium hydrox...

**chemistry**

What are the acids and bases of the following salts? Na3PO4 PbS KIO3 Do you meant on dissociation? phosphoric acid, sodium hydroxide lead hydroxide, hydrogen sulfuric potasslim hydroxide, idoic acid. I am not certain of your question.

**chemistry**

What are the acids and bases of the following salts? Na3PO4 PbS KIO3

**economics**

If the reserve requirement is 20% and a bank doesn't have excess reserves, why would a $100 deposit lead to a greater than $100 increase in the money supply? Interest?

**econ.**

If the reserve requirement is 20% and a bank doesn't have excess reserves, why would a $100 deposit lead to a greater than $100 increase in the money supply. because of the money multiplier. A $100 deposit (e.g., into a checking account) gives the bank both a $100 liabilit...

**economics**

If the reserve requirement is 20% and a bank doesn't have excess reserves, why would a $100 deposit lead to a greater than $100 increase in the money supply. answer posted above.

**math**

What are the following symbols used in math sequences: a sub i, n, N? ai is the ith element of the sequence n is the value of i in the term you are refering to. For instance, 3,4,5,6 a3 is 5. That term corresponds to n=3 N is the number of terms in the sequence.

**chemistry**

I cannot figure out how to work this stoichiometry problem with the given equation: Mg+2HCl-->MgCl2+H2 What volume of hydrogen is produced from the reaction of 50.0g of Mg and the equivalent of 75g of HCl What do you not understand about it? It is a limiting reagent problem...

**chemistry**

How much does 1 molecule of bromine weigh? I know the atomic mass for bromine is 79.90 g but I do not know how to use it to figure out the weight of the molecule. The given answer is 2.654x10^-22 but I do not know how to get there. First, the molecule of bromine is Br2. Since ...

**chemistry**

How is the way metals form ions different from the way nonmetals form ions? Think about this. When Na, a metal, becomes an ion, what must it do? It has one electron in its outside shell. When Cl, a non-metal, forms an ion, what must it do? It has seven electrons in its outside...

**chemistry**

does chlorine or carbon have greater ionization energy? I would expect it to be harder to pull an electron away from 17 + charges on chlorine than 6+ charges on carbon; although the outer electron is farther away in Cl. You can look these things up in a table; I did and Cl has...

**chemistry**

How do you name this acid? HClO2 I found the answer but now I need to know N2F4. chlorous acid dinitrogen tetrafluoride

**spanish**

If you told us which vocabulary you are currently studying it could help narrow down the words. can someone help me unscramble these? it's in spanish. capetlusidr tabonca tishces tconserede well, i figured out all of the above, except for "tconserede" i'm cur...

**chemistry**

What is the maximum number of hybrid orbitals a carbon atom can form? Is it 4 because carbon has 4 valence electrons? yes.

**chemistry**

How do you compare and contrast a chemical equation and an ionic equation? Is a chemical equation any equation while an ionic equation deals with the gain/loss of electrons? A chemical equation usually consists of what I call a molecular equation whereas an ionic equation (or ...

**chemistry**

What would the formula be for barium chloride dissolved in water? BaCl2(aq)

**chemistry**

Does this equation need to be balanced? AlCO3 => AlO+CO2 Also, how would this equation be balanced? NiCl+O2 => Ni2O3+Cl2O5 Neither equation you have is an equation so they can't be balanced. Do you mean aluminum carbonate. That would have the formula Al2(CO3)2. Alumi...

**Math**

What is the maximum slope for a bridge on an interstate? Since this is not my area of expertise, I searched Google under the key words "maximum slope interstate bridge" to get this possible source: http://72.14.253.104/search?q=cache:_pnq5Gew-asJ:www.modot.mo.gov/oth...

**Shakespeare**

I am having trouble finding scholarly articles/essays on issues found in King Lear. Any suggestions? First look at this site for Themes and Motifs: http://www.sparknotes.com/shakespeare/lear/ Then use a search to check articles on those themes. One is brutality... there has be...

**chemistry**

How does an ionic bond form between zinc and oxygen? Zn has two electrons in its outside shell and wants to give them away (which makes the next inner shell now the outer shell but is is full with eight electrons). Oxygen has six electrons in its outside shell and want to gain...

**chemistry**

What are the certain conditions when ionic compounds conduct an electric current? Why are ionic compounds not always used as conductors? Ionic compounds conduct an electric current when the ions are free to move about. This usally means they are in solution form (as ions) or t...

**chemistry**

How does an ionic bond form between zinc and oxygen? Zn has two electrons in its outside shell and wants to lose those two. Oxygen has six electrons in its outside shell and wants eight; therefore, oxygen takes the two electrons form Zn making the Zn with a +2 charge and oxyge...

**chemistry**

The more reactive an atom, the higher its potential energy. Which atom has higher potential energy, neon or fluorine? Neon is hardly reactive at all. When it reacts, it will make news. Fluorine is a very reactive element. It is very difficult to keep it from reacting, often vi...

**chemistry**

How could you make the reaction Cu(NO3)2 + NaCO3 -- CuCo3+NaNO3 balanced? You have the formula for sodium carbonate wrong> Na2CO3 The carbonate ion is -2 valence, and Na is +1. Now it will balance.

**chemistry**

what happens when solids, liquids, and gases are heated/cooled? Most expand if heated; contract if cooled. Solids, if heated high enough will melt and the liquid may occupy less volume than the solid. Likewise, liquids, if heated high enough, will boil and the volume of the va...

**chemistry**

What instrument is used to determine the mass and relative ambuandaces of small atomic particles? You may be thinking of the mass spectrometer. I'm not sure how small you are talking about but the mass spec is used to determine atomic masses and relative abundance of the e...

**Brothers Karamazov**

I do not understand why Dmitri originally doubted that Smerdyakov murdered Fyodor but later changed his mind and thought Smerdyakov murdered Fyodor. Be sure to go into www.sparknotes.com/lit and find this book under the B's -- then read the section called Analysis of Major...

**chemistry**

How are gases and vapors different? Most use gases and vapors interchangeably. I looked up both words in my copy of Webster's and found gas listed vapor as a synonym and vapor listed gas as a synonym. However, some of the definitions for vapor listed "particles as in ...

**advanced math**

How do you find the domain and range of an equation? Since this is not my area of expertise, I searched Google under the key words "domain range equation" to get these possible sources: http://education.yahoo.com/homework_help/math_help/problem_list?id=miniprealggt_1...

**math/science**

Since the SI unit for temperature is Kelvin, why is the Celsius scale most often used in the science labs? I don't know that it IS the most often used. For example, almost all of the calculations require changing from C to K (gas law problems, and almost all others EXCEPT ...

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