# Chemistry - Equations

62,762 results

Chemistry
When solving Hess law problems,do we need to use all the equations given to get the Htotal or just choose the relevant equations that are related to the final equation required? Let's say there r 5 equations given,but the relevant equations are 3 only ,so we can neglect the ...

Chemistry
What are the equations for these two equations? Not net ionic equations. a) Nickel (II) chloride and iron b) Sodium and water

Chemistry
COMPLETION AND BALANCING OF EQUATIONS Complete and balance the following equations: 1. ZnCl2 + AgNO3

Chemistry
COMPLETION AND BALANCING OF EQUATIONS Complete and balance the following equations: 1. ZnCl2 + AgNO3

Chemistry
Balancing chemistry equations and need help! Thank You!? Help balancing any of the following equations: Cl2+Na Br----> NaCl2 + Br Na+LiOH---->

Chemistry
Write balanced equations for the formation of K4[Ni(NCS)6] starting from an anhydrous sample of nickel(II) nitrate. (3 equations necessary)

Math 116
Consider the following system of equations. y=2x-2 y-2x=9 What can you conclude about the system of equations? a. The system of equations is inconsistent. b. The system of equations is dependent. c. The system of equations is independent. d. none of these.

chemistry
complete and balance the following molecular equations and then write net ionic equations for each reaction. BaCl2(aq) + K2SO4(aq) KNO3(aq) + HCl(aq)

Math 1
Consider the following system of equations. y = 4x - 4 y - 4x = 3 What can you conclude about the system of equations? A) The system of equations is inconsistent. B) The system of equations is dependent. C) The system of equations is independent. D) none of these

math
Consider the following system of equations. y = 2x - 2 y - 2x = 7 What can you conclude about the system of equations? The system of equations is inconsistent. The system of equations is dependent. The system of equations is independent. none of these

Chemistry
Does anyone know of any sites that make learning to balance equations easy? I just transferred to a new school and the chemistry class is way ahead of my old class. I really don't get it. Please help since there is a test tomorrow and it's on stuff that you have to be able to ...

Chemistry
I understand how to balance equations when the full equations are given to me but I don't understand how to write a single replacement reaction. Help Me??

chemistry
How to balance a chemical equations quickly? please tell me a shortcut to balance any type of equations.

chemistry
Metals + cold water. Li, Na, K, Ca. Notes on reactions, equations or space? <<<< don't no what space or equations means. can someone help? Also, say order of reactivity.

Chemistry
Write the word equations below as chemical equations and balance. copper + sulfuric acid yield copper(II) sulfate+ water + sulfur dioxide

Chemistry
Question: write the balanced equations for the titration of oxalic acid (C2H2O4) with KOH. Work so far: I know that the overall equation is COOH)2 + 2KOH ------.> (COOK)2 + 2H2O but I am unsure how to proceed to the two step-wise equations

Chemistry
Mg(s) + 2HCl(aq) -> MgCl2(aq) + H2(g) delta H1? MgO(s) + 2HCl(aq) ->MgCl2(aq) + H2O(l) delta H2? To make these equations add up to the formation reaction of MgO, you will need to include the following: H2(g) + 1/2O2(l) delta H =-241.8 kJ Using Hess's Law and manipulating...

math
Explain why the simultaneous equations y=1/2x+2 and 2y-x:4 have an infinite number of solutions. What is diffrent about these equations compared with the equations in the first question ( the equations were y=2x+3 and 5y-10x=5)? What is similar? ( include work to prove why and...

math
Consider the following system of equations. Y = 3x – 7 Y - 3x = 5 a) The system of equations is inconsistent. b) The system of equations is dependent. c) The system of equations is independent. d) none of these

Algebra
Translate to a system of equations. DO NOT SOLVE. A nontoxic scouring powder is made up of 4 parts baking soda and 1 part vinegar. How much of each ingredient is needed for a 16-oz mixture? What are the two equations? For most problems, I can easily find the info for the two ...

Chemistry
Write formula equations and net ionic equations for the hydrolysis of the following salts in water. a. sodium carbonate b. ammonium bromide I don't know what the products should be. a. Na2CO3+H2O--> ? b. NH4Br+H2O--> ? Please help me with this. I really need this. Thanks...

chemistry
how do you do ionic equations Do you mean net ionic equations?

Math, Year 10, Simult. Equations
How can i know if two lines/equations intersect on a graph, algebraically? For example, I have two equations: 1. -x^2 + 3x + 4, and 2. x - 4 Ty in advan.

math
solve the simultaneous equations to find the coordinates of the point of intersection for the pair of lines of the simultaneous equations. Then check the answer by graphing the equations 3x-y=-4 2x-y=0

Chemistry
I am learning the different types of chemical reactions synthesis, decomposition, single displacement, and double displacement I am also learning skeletal equations word equations and balancing the equations I know how to balance equations if I am given the formula in symbols ...

CHemistry
Redox equations are often long and difficult to balance by inspection. Luckily, electron transfers and oxidation numbers provide hints for balancing such equations. Balance the following equation: K2CrO4 + Na2SO3 + HCl ---> KCl + Na2SO4 + CrCl3 + H20

Algebra 2
1.) Write a system of equations that has NO solution. 2.) If you wanted to eliminate the y variables in the system of equations below, what would you multiply the first and second equations by?( Do not solve the equation) 2x-3y=8 7x-4y=11

Algebra 2
1.) Write a system of equations that has NO solution. 2.) If you wanted to eliminate the y variables in the system of equations below, what would you multiply the first and second equations by?( Do not solve the equation) 2x-3y=8 7x-4y=11

Algebra 2
1.) Write a system of equations that has NO solution. 2.) If you wanted to eliminate the y variables in the system of equations below, what would you multiply the first and second equations by?( Do not solve the equation) 2x-3y=8 7x-4y=11

Chemistry
Write balanced equations for the formation of [Ni(NH3)6][BF4]2 starting from an anhydrous sample of nickel(II) choride hexahydrate. (3 equations necessary) I am slightly confused by this. I think the starting sample has the formula [Ni(H20)6]Cl2 Would this react with ammonia...

math
How do you solve system of equations and tell if they're consistant and independant,consistant and dependent,and inconsistant? If you find no solutions then the system is inconsistent. Suppose you have N variables and M equations (N larger than or equal to M). Then, if you ...

Chemistry-Repost
Write formula equations and net ionic equations for the hydrolysis of sodium carbonate in water. Responses Chemistry - DrBob222, Friday, April 24, 2009 at 10:50pm The hydrolysis of Na2CO3 ends us as the hydrolysis of the carbonate ion. The molecular formula is Na2CO3 + HOH==...

Math
Stupid question time. I need to figure out how to rearrange equations to solve for x in my chemistry homework, which involves putting equations in quadratic form first. But I can't for the life of me remember how to "rearrange" them correctly. So what in the step by step way ...

Chemistry-Balancing Equations
I need help balancing equations. _C7H60+_02->_C02+_H20 I don't know how to balance it because when i do it just won't work out ill have too much on one side and it just wouldn't work. i know im missing a rule or something.

math
please anwer these: 1) how can i multiply and divide polynomials containing radicals? 2) how can i solve radical equations? 3) how can i solve qudratic equations by factoring ? 4) how can i solve quadratic equations graphically ? thank you !!!!!

algebra
solve the system of equations by graphing. Then classify the system as consistent or inconsistent and the equations as dependent or independent. x+y=14 x-y=2 What is the solution of the system of equations?

alegebra
solve the system of equations by graphing. then classify the system as consistent or inconsistent and the equations as dependent or independent. 3u+v=13 3u=v+29 What is the solution of the system of equations?

chemistry
Write the rate equation for the relative disappearance of dinitrogen pentoxide. Write the rate equations for the relative appearance of nitrogen dioxide and oxygen gas. When writing the equations, remember to think about how many NO2 and O2 molecules are formed from 2 N2O5.

chemistry- redox
Complete and balance the following equations using the method of half-reaction. both reactions happen in acidic solutions: a. Cu(s) + NO3-(aq)--> Cu2+(aq) + NO2(aq) b. Mn2+(aQ) + NaBiO3(s)--> Bi3+(aq) + MnO4-(aq) I'm having trouble getting the half-rxn equations and the ...

chemistry
Net Ionic equations for.. 1. Co(NO3)2 + NH3 --> ?? 2. Cu(NO3)2 + NH3 --> ?? 3. Ni(NO3)2 + NH3 --> ?? I can balance equations, I just don't know what goes on the products side.

chemistry
Which of the following equations represents a reaction for which the delta H can be called a standard enthalpy of formation, delta Hf? a) FeO(s) + CO2(g) -> FeCO3(s) b) 1/2 N2(g) + 2 O(g) -> NO2(g) c) 2 Na(s) + Cl2(g) -> 2 NaCl(s) d) Ba(s) + N2(g) + 3 O2(g) -> Ba(...

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 ...

Chemistry- gaz and stoechiometry
The preparation of KClO3 follows these equations: 2KMnO4 + 16HCl->2KCl + 2MnCl2 + 5Cl2 (g) + 8H2O 3Cl2 (g) + 6KOH ->KClO3 + 5KCl + 3H2O 1) How many moles of KClO3 are produced by one mole of KMnO4 I think the only link between the two equations is Cl2 but I don't ...

Math
How do I write the Symmetric Equation of a line given the following parametric equations: (where t is a scalar) x=0t y=0t z=1+1t I know normally I would solve each equation for t and set the equations equal to one another. However, I can not solve for t in the first two ...

Math
How do I write the Symmetric Equation of a line given the following parametric equations: (where t is a scalar) x=0t y=0t z=1+1t I know normally I would solve each equation for t and set the equations equal to one another. However, I can not solve for t in the first two ...

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 ...

College Algebra
Solve the system of equations with ROWOPS program. I know how to do the first step but after that it gets difficult for me, this is the system of equations: 3x + y - z = 1 x + 2y - z = 0 2x - y + z = 4 I used to be able to do these but now I'm getting a little rusty. Thanks ...

chemistry
use thermochemical equations shown below to determine enthalpy for the reaction: H2CO3-->H2O+CO2 1) H2CO3 --> H2CO + O2 H; 224 KJ 2)H2CO + O2 --> H2O + CO2 H; -100KJ I know this problem is one that you have to rewrite the equations to get the equation in the original ...

chemistry
use thermochemical equations shown below to determine enthalpy for the reaction: H2CO3-->H2O+CO2 1) H2CO3 --> H2CO + O2 H; 224 KJ 2)H2CO + O2 --> H2O + CO2 H; -100KJ I know this problem is one that you have to rewrite the equations to get the equation in the original ...

Predicting products for electrolysis
when you have your 4 different equations to form 4 different possible equations, what two equations do you use for water, O2(aq) + 4H+ + 4e- ----> 2H20 (+1.23) 02 (g) + 2H2O (l) + 4e- ----> 4OH- (+0.40) 2H20 (l) + 2e- ---> h2 (g) + 2OH- (aq) (-0.83) I'm not quite sure...

Math: Parametric Equations
Let G be the graph of the parametric equations x = cos(4t), y = sin(6t). What is the length of the smallest interval P such that the graph of these equations for all t E P produces the entire graph G? (The "E" represents the symbol for "is in" that looks kind of like a rounded E)

engineering
Using mechanics of materials principles, (i.e. equations of mechanical equilibrium applied to a free-body diagram), derive the following equations: s’ = s cos2q = s[(1+ cos 2q) / 2] t' = s sinq cosq = s [sin 2q / 2] s=sigma, q=theta, t=tau I have looked in "Theory of ...

Physical Chemistry
In my physical chemistry book, I'm reading about "Margules Equations": ln γA = ΒxB2 ln γB = ΒxA2 I don't understand where these equations come from. How is it known that there is a single constant Β that satisfies both relationships?

Chemistry
The two most common oxidation states are Cr(III) and Cr(VI). Balance the following oxidation-reduction equations that involve one of these oxidation states of chromium. Assume that the reactions occur in acidic solution. A. Cr(s) + O2 (g) + H^+ <-> Cr^3+ B. Fe^2+ (aq) + ...

Math - system of equations
write two other equations that have the same solution as this system od equations. 3x-4y=-14 -x+3y=18 I found the solution to the system it is (6,8) there after how do i go about it?

Chemistry URGENT PLEASE PLEASE PLEASE HELP!
Determine whether the solution is basic, acidic, or neutral. Write net ionic equations to show how it behaves in aqueous solutions. 1) Fe2(SO4)3 I know it is acidic Do I do hydrolysis equations for the net ionic or do I do redox reactions?

algebra 1
I'm stuck on this problem. Can you help? -4x-9y=1 -x + 2y =-4 WHat is x and y? Two equations in two unknowns. Here is a quick way to solve them -4x - 9y = 1 4x - 8y = 16 (I got that my multiplying both side so the secind equation that you provided by -4) Now add the two ...

Math
Solve the following system of equations by graphing. If the system is inconsistent or the equations are dependent, say so 5x-2y=3 10x-4y=6 I know the equations are dependent but I am confused on what is the solution set I'm thinking its (10x-4y=6) but I'm really not sure.

Chemistry
Why doesn't potassium ion K+ from KMnO4 appear in the following two unbalanced equations: MnO4– + C2O42– Mn2+ + CO2 MnO4– + Fe2+ Mn2+ + Fe3+ ? The potassium ion is a spectator ion. You have written ionic equations (but omitted the arrows to separate the reactants from ...

chemistry
our lab experiment was Isolationa nd Identification of the Major Constituent of Clove Oil. We know the major component is Eugenol, but our professor wants us to write the equations for the extraction of eugenol from the distillate with dichloromethane and then the equation for...

alegebra
Solve the system of equations by graphing. Then classift the system as consistent or inconsistent and the equations as dependent or independent. 3x-y=14 3x+4y=-26 What is the solution of the system of equations? Type an ordered pair.N for no solution R for the solution if real...

Math
Write two equations that have your two integers as solutions. Show how you built the equations using your integers, numbers used 5 and 8. Solve your system of equations by the addition/subtraction method. Make sure you show the necessary 5 steps.

Chemistry
I'm having alot of trouble in chemistry. Currently were studying chemical equations and reactions. I would like to know if this is a single or double replacement reaction. 2Li + H2O ---> 2LiOH + H2

chemistry
Why does a titrated sample that is fuschia with phenolphthalein turn colorless when the solution is blown into? HINT: Use chemistry and properly balanced chemical equations to support your statement.

Math
I am stuck on trying to figure out how to do this question. Could someone please show me 5 necessary steps ? Thank you. Here is how the assignment question is worded. Select any two integers between -12 and +12 which will become solutions to a system of two equations. Write ...

Algebra
To solve the following system of equations by elimination, which step would best to perform first? 1/2a - 1/4b = 1 1/3a + b= 3 A. Add the two equations. B. Subtract the two equations. C. Multiply the first equation by 4. D. Divide the first equation by 3.

Silmultaneous Equations
Need a bit of help solving the following equations. sqrt(5/8-(sqrt(5)/8))LH+cos (43pi/180)RH = 0 and 1/4(1+sqrt(5)LH+sin(43pi/180)RH-2g=0 What is the best way to start when trying to combine these equations? Thanks

Chemistry
Need for two balanced chemical equations? I am in need of these two equations which I however do not know how they react. If anyone could help, it is greatly appreciated :) "Formation of products by heating a solid mixture of calcium propanoate and soda lime" "Formation of a ...

chemistry
how do you balance equations?

quantitative chemistry
Determine [Zn2 ], [CN–], and [HCN] in a saturated solution of Zn(CN)2 with a fixed pH of 1.78. The Ksp for Zn(CN)2 is 3.0 × 10–16. The Ka for HCN is 6.2 × 10–10. I know the following is what needs to be done, but im unsure of how to go about it. 1. Write the pertinent ...

Chemistry
This is for grade 11 chemistry, balancing equations. Help asap? I'd like to get it done by tonight, if possible. Type of reaction: Predict product in words: Write Balance equation: Heres the question. Aluminum+ Zinc Sulfide =

math
how do i solve two step equations? Do you mean two equations in two unknowns? The method of substitution is one way. There is a good tutorial here: http://www.themathpage.com/alg/simultaneous-equations.htm

chemistry
how to balance chemical equations

Chemistry
how do you balance equations to get the formula?

Chemistry
2)Which of the following equations represents a reaction for which the delta H can be called a standard enthalpy of formation, delta Hf? a) FeO(s) + CO2(g) -> FeCO3(s) b) 1/2 N2(g) + 2 O(g) -> NO2(g) c) 2 Na(s) + Cl2(g) -> 2 NaCl(s) d) Ba(s) + N2(g) + 3 O2(g) -> Ba...

Trig
How do you convert rectangular equations into polar equations? If x4−y4=xy , then r2=atan(b); What is a? What is b?

Math 8R - HELP!
Multi-Step Equations Systems of Equations x + y = 0 5x + 2y = -3 this is what i got so far.... x + y = 0 ----> x = 0 - y 5x + 2y(0-y) = -3 please help!!!!

PLEASE HELP WITH DIFFERENTIAL EQUATIONS QUESTION??
Which of these equations have an equilibrium solution. What are they? How are their DE's different? dy/dx=6y-y^2 dy/dx 15-3y

biology
I need help figuring out how to balance scientific equations well what are the equations?

Vectors
How to solve a system of equations if there are FOUR equations with THREE unknowns?

Math - Equations
Just learned equations and want to know if i am doing write.. 4y= 2x-2 2y=2x6 ans (-7,-4) x+2y=7 3x-2y= -11

Math
Find parametric equations and symmetric equations for the line of intersection of the given planes. x + y + z = 2, x + z = 0 X=1 y = Z= x=, y=

algebra 2
Solve system of equations.Describe each step if your solution. W+X+Y+Z=2 2W-X+2y-Z=1 -W+2x-y+2z=-2 3w+x+y-Z=5 Please help I only know how to do this with 3 equations.

Math
How would I expand this two quadratic equations and find a & x for both of them? Here are my equations: y=a(x+1.5)^2+0 y=a(x+2)^2+1.5

Mathematics
Q 1 . Change the following polar equations into Cartesian equations: (a) r = a sin 2 A (b) A=π/4

Maths
Change the following polar equations into Cartesian equations: (a) r = a sin 2 A (b) A=π/4

Math: Parametric Equations
The graph of the parametric equations x=cos(t) y=sin(t) meets the graph of the parametric equations x=2+4cos(s) y=3+4sin(s) at two points. Find the slope of the line between these two points. So far I've set up the system of equations cos(t)=2+4cos(s) sin(t)=3+4sin(s) but it ...

cHEMISTRY
i don't know how to write chemical formulas is it like nomenclature because i need to balance equations (which i know how if the equation is given to me the symbols type but not in words), i need to write skeletal equations but i don't know if they are correct. example: 2H2+O2...

AP Chemistry
What is meant by minimum and maximum energy problems. Are there different equations to find them. What does this conceptually mean? * This is dealing with quantum chemistry such as plancks equation, and debroglie equation.

Algebra Quadratic Equations
What are the pros and cons of completing the square as a way to solve quadradic equations?

Math
Which of the following equations gives the relationship between S and T in the table below? S 1 2 3 4 5 6 T 1 4 7 10 13 16 How do you find equations again?

Math 8 HELP!
Multi-Step Equations Systems of Equations y = 2x - 4 y = x - 1 please help!!! :'(

algebra 2
How does writing equivalent equations help you solve a system of equations?

Math
My math teacher said to use the FOIL (First Outer Inner Last) property to simplify these quadratic equations I have made from looking at two parabolas. Here are my equations & how would you use the FOIL property on each of the equations and also can someone help me with ...

quick question regarding equations
I know there are methods out there but what do you think is the best or easiest method(s) of solving a system of equations. Depends on the coefficients of the equation. If in one of the equations I can solve for one of the variables without having to express it in fractions, I...

math,correction
I have to determine which two equations represent parallel lines. equations are (a) y=(-4)x+2 (b) y=(4)x+2 (c) y= (1/2)x +2 (d) y=(-4)x+3 so the answer would be: A and D yes

Math
I have figured out x to be 2 for this system of equations but now I need help on determining the solution of the equations which are y=4x and y=2x^2. Can you please help me!

math
1. Select any two integers between -12 and +12 which will become solutions to a system of two equations. 2. Write two equations that have your two integers as solutions. Show how you built the equations using your integers. Your solution and equations should not be the same as...

chemistry
i have aproblem in balancing equations

Chemistry
Describe what hard water is and how a water softening unit works. Provide balanced chemical equations to show how sodium sulphate can remove these ions (Magnesium and Calcium). The first was no problem, but I am having trouble trying to get through the second part balancing ...

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