# Posts by Bob

Total # Posts: 3,282

**Chemistry**

Balance the following equation for a half reaction that occurs in basic solution. Use e– as the symbol for an electron. SO3^2- ---> S2O4^2-

**Chemistry**

Thanks a lot i figured this one out too its: 2H2O + MnO2 + 3Cu^2+ ----> MnO4^- + 3Cu^+ + 4H^+

**Chemistry**

This is how I am doing it: 1. break up into half reactions MnO2--->MnO4 and Cu^2+ ---> Cu^+ 2. add H20, H+, and e- to both sides and I get: 2H2O + MnO2 ---> MnO4 + 4H + 8e^- and e^- + Cu^2+ ----> Cu^+ then adding them I get: 2H2O + MnO2 + Cu^2+ ---> MnO4 + Cu...

**Chemistry**

In a particular redox reaction, MnO2 is oxidized to MnO4– and Cu2 is reduced to Cu . Complete and balance the equation for this reaction in acidic solution. Phases are optional. MnO2 + Cu^2+ ---> MnO4^- + Cu^+

**English Literature**

THANK YOU SO MUCH

**English Literature**

We have just finished reading Poe's "The Fall of the House of Usher" and I need to explain, in a paragraph what "Roderick is all mind in a weak body" means. I think it's somehere along the lines of his spirit being alive but his exterior being dead...

**chemistry**

if 7 moles O2 are used, houch energy is produced?

**french**

unscramble - qobusteiu

**Chemistry**

How do you calculate ΔSfus and ΔSvap for HCl given melting point,ΔHfus, boiling point, and ΔHvap also how do you determine the entropy change when 5.20 mol of HCl(l) freezes at atmospheric pressure.

**Chemistry**

The following equation represents the decomposition of a generic diatomic element in its standard state. (1/2)X2(g)--->X(g) Assume that the standard molar Gibbs energy of formation of X(g) is 5.45 kJ·mol–1 at 2000. K and –64.30 kJ·mol–1 at 3000...

**Chemistry**

Ok thanks a bunch!

**Chemistry**

how do you find lnQ?

**Chemistry**

For a gaseous reaction, standard conditions are 298 K and a partial pressure of 1 bar for all species. For the reaction C2H6(g)+H2(g)---->2CH4 the standard change in Gibbs free energy is ΔG° = -32.8 kJ/mol. What is ΔG for this reaction at 298 K when the ...

**Chemistry**

A critical reaction in the production of energy to do work or drive chemical reactions in biological systems is the hydrolysis of adenosine triphosphate, ATP, to adenosine diphosphate, ADP, as described by ATP(aq) +H2O (l) --->ADP(aq) +HPO4^2- for which ΔG°rxn = &#...

**math**

the drawing below measures 7.8 cm by 6.2 cm what is the perimeter in meters? scale 1cm=10m the drawing is square

**science 1 question**

ocean trenches are formed when the denser oceanic plate sinks

**health**

Sooo whats the answer????

**econ**

You want to determine the profit-maximizing production quantity for a monopolist. You can ask the firm's consultant to draw the firm's revenue and cost curves, but each curve would cost you $1,000. From the following list indicate which curves you will request and why...

**Macroeconomics**

I need help to answer this question? You want to determine the profit-maximizing production quantity for a monopolist. You can ask the firm's consultant to draw the firm's revenue and cost curves, but each curve would cost you $1,000. From the following list indicate ...

**physics**

500 N

**physics help!**

a!!! It's A!

**physics**

3.3

**Health**

A pound of butter since butter has more fat than lean meat does.

**Health**

Which would produce a greater number of Calories- a pound of lean meat or a pound of butter? Why is it so?

**Math**

The entrance hall to the Louvre Museum in Paris is a glass and metal pyramid with a surface area of approximately 1980 square on each side . The base of the pyramid is a square that is 35.4 meters on each side. What is the slant height of the pyramid ? Round to the nearest ...

**health**

So what is the answer???

**Chemistry**

H2O(aq) + H2O(aq) ==> H3O^+(aq) + OH^-(aq)

**Science**

a certain object has a volume of 25.0 mL and a mass of 100 g. What is the density of the object

**science(check answers)**

4 is C. and 5 is true.

**educational technology**

Adb is correct 100%

**math**

I need help

**Algebra 1**

Hi! I'm doing my math homework, but I got confused. Can someone please help me how to solve simplest radical forms with an example? With square roots?

**Physics!**

Ad

**Computers**

System A consists of a single ring with 100 stations, one per repeater. System B consists of four 25 stations rings linked by a bridge. If the probability of a link failure is , a repeater failure is , and a bridge failure is , derive an expression for parts (a) to (e). 50 ...

**Science**

i dont freaking know thats my answer

**science pls help**

True c,a,a

**Calculusmath**

what is an equation of the conic section x^2+y^2=16 after a rotation of 45 degrees about the origin. A. (x')^2+(y')^2=16 B. (x')^2- (y')^2=16 C. (x')^2- 2x'y'+(y')^2=16 D. (x')^2+ 2x'y'+(y')^2=16

**science(check answers)**

b b d a

**chemistry**

Phosphoric acid is a triprotic acid, so H3PO4, H2PO4 -, and HPO4 2- are all acids. Which of the solutions below would have the lowest pH? 0.1 M NaH2PO4 0.1 M Na2HPO4 0.1 M Na3PO4

**World Geography**

If I were elected an official, I'd first of all be totally freaked out. That's because fifteen year old shouldn't be elected any type of office until their old enough to get a job. But second of all I'd try to fulfill whatever duty I was elected to do. I would...

**Physics**

A train 500 m long is moving on a straight track with a speed of 84.2 km/h. The engineer applies the brakes at a crossing, and later the last car passes the crossing with a speed of 16.4 km/h. Assuming constant acceleration, determine how long the train blocked the crossing....

**Physics**

Does it take twice the work to stretch a spring 2cm from its equilibrium position as it does to stretch it 1cm from its equilibrium position?

**Math**

150 + 50 x 17 = 1000 (1 km)

**math 4**

40 cm and 40 in

**computers**

1. It is important to include voice and point of view in writing because (1 point) A. It helps the reader understand the characters feelings and emotions B. It adds more words to the story C. It makes the information stand out D. It makes the story more important 2. A venn ...

**physics**

idk

**Finance**

940=34.5(PIVIFAr%,n)1,000(PVIFr%,n)

**social studies**

do ur own homwurk

**Physics**

idk

**ecology**

If you observe no changes in gene frequencies in a population over several generations, can you conclude that the population is not subject to natural selection?

**English**

If I wanted to search romanticism I would have done it, but I was hoping someone who already knows about it could help push me in the right direction/give me something to go on.

**English**

What was poetry like during the Romantic period? Discuss three characteristics of Romanticism. I'm looking for 1-2 sentences for the first question, and maybe 3-6 for the second question. Thank you so much to anyone who helps. Any help is appreciated. :)

**science**

Thx

**Chemistry**

A 150.0 mL sample of a 1.50 M solution of CuSO4 is mixed with a 150.0 mL sample of 3.00 M KOH in a coffee cup calorimeter. The temperature of both solutions and the calorimeter was 25.2°C before mixing and 31.3°C after mixing. The heat capacity of the calorimeter is 24...

**math**

A manufacturer produces a 4-cup and 8-cup coffee maker. The 4-cup maker takes 6 hours to produce and the 8-cup takes 9 hours. The manufacturer has at most 500 hours of labor per week. a. Write an inequality to represent the number of each type of coffee makers they can produce...

**Science**

number 16 is B not C.

**Wave**

Rebecca is wrong, but Henry is right.

**science**

1.What two things happen to particles in a substance when the substance is heated? 2. What are the three most common states of matter on Earth? 3. Why does a liquid take the shape of whatever container it is in but does not expand to fill the container completely? 4. A certain...

**math**

Oregon is about 400 miles from west to east, and 300 miles from north to south. If the image of Oregon on a map is 15 inches tall (form north to south), about how wide is the image of Oregon on the map?

**english**

F$UCK THIS F$UCKING TEST

**english**

There are 19 questions on the test now, they're's no way any of these are right now. I hate this Odysseus book

**english**

fable

**Help with science**

5 c 7 c

**physics**

ind the force of gravity between a newborn baby (mass = 2.9kg ) and the planet Mars (mass = 6.4×10^23kg), when Mars is at its closest to Earth (distance = 5.6×10^10m).

**physics**

Find the force of gravity between a newborn baby (mass = 2.9kg ) and the planet Mars (mass = 6.4×1023kg), when Mars is at its closest to Earth (distance = 5.6×1010m).

**algebra**

The perimeter of a pool is 64 feet and has a width of x and a length of x-4. Write an equation and find both the width and length of the pool.

**Chemistry**

Calculate the enthalpy change of formation for the following reactions using Hess's law, and the enthalpies of formation given in Figure 4: b) MgO +2HCl --> MgCl2 +H2O c)NaOH+ HCl -->NaCl +H20 Figure4: the given enthalpies of formation compound values are: Mg(OH)2 is...

**Physics**

UCSC?

**Physics**

For a rotating object the equation for acceleration is a = v^2 / r. The force is F = m*a = m*v^2 / r. The force in this problem is the coulomb force. F = k*3q*q / r^2 = m*v^2 / r Since the kinetic energy is just m*v^2 / 2, and that's all we need, let's multiply both ...

**Chemistry**

Water is composed of 11.2% hydrogen and 88.8% oxygen. what mass of water contains 50.0g of 0xygen?

**Physics**

What is the frequency of a blue light with a wavelength of 489 nm

**chemistry**

An unknown substance has a mass of 28.1 g. The temperature of the substance increases by 16.3 degrees Celsius when 176 J of heat is added to the substance. What is the most likely identity of the substance? The table lists the specific heat capacities of select substances.

**SS-check my answers plz!!!**

u are a major cheater

**algebra 1**

A gardner is calculating the perimeter of a rectangular garden, which has a length of 25 feet. The area of the garden is 400 square feet. What is the perimeter of the garden? Write the equation: could it be this? p=400/25+400/25+25+25

**Algebra 1**

ok thanks

**Algebra 1**

A jacket costs $45. It is on sale for 20% off. What is the price of the new jacket? Write the equation.

**Physics**

A spring with a force constant of 5.4 N/m has a relaxed length of 2.63 m. When a mass is attached to the end of the spring and allowed to come to rest, the vertical length of the spring is 3.64 m. Calculate the elastic potential energy stored in the spring. Answer in units of ...

**Algebra 1**

Two students are absent. This is 1/8 of the entire class. How many students are in the entire class? Write the equation: How would you write an equation?

**Algebra 1**

thanks

**Algebra 1**

Two students are absent. This is 1/8 of the entire class. How many students are in the entire class? Write the equation: How would you write an equation?

**Eng 2**

Which phrase best describes this type of sentence? Sandy creates her best pieces of art late in the day. A) prepositional phrase modifying an adverb B) adverb modifying other adverbs C) prepositional phrase modifying other prepositional phrases D) preposition with compound ...

**Math**

I HAD THIS QUESTION TOO. ITS 13mm

**algebra 2**

10

**MATH**

Find the exact values. (a) tan(π/3) = ? (b) sin(7π/6) = ? (c) sec(5π/3)= ?

**Math**

Rewrite by completing the square x2 + x + 1

**Math**

Given the line 4x - 3y = 12, what is the distance between it and the origin I know the answer is 2.4 but how do u do it

**5th grade math**

A.. Because then number after 1 have to multiply the previous number (1) so 1*1=1. Then it subtracts the previous number 1-1=0. So the list would be 1,0,0,0,0 so on... So A is incorrect

**Math**

Which method did u use? I don't know if there is a faster way of doing it then what I'm doing

**Math**

Given the line 4x - 3y = 12, what is the distance between it and the origin Is it 2.4?

**science**

IS PLUTO A PLANET...

**math crctprep**

The Jones family drove a total of 3584 miles in 9 days. They drove the same number of miles each day. Which of the following is closest to the number of miles they drove each day?

**Math**

Someone help please

**Math**

if a b and c are constants and (x+2)(x+b)= x^2+cx+6, what is c

**Language Arts**

Can you define this in simpler terms: Determine the meaning of words and phrases as they are used in the text, including figurative and connotative meanings; the cumulative impact of specific word choices on meaning and tone. How might this be important in school, work, or ...

**SCIENCE HELP PLEASE**

no because its stupid

**Math**

if x,y and y-(1/x) are not 0, then (x-(1/y))/(y/(1-x))=?

**Math**

If n! =1×2×2×...×(n-1)×n,find value of (3!)!/3!

**Math**

What is the value of 1000^2/(252^2/248^2) How do you do it faster

**Math**

If x≠0, x/2=y^2 and x/4=4y, then what is the x

**Math**

1. For all non-zero numbers x and y such that x= 1/y, what is the value of ( x- 1/x)(y+ 1/y)