Friday

November 27, 2015
Total # Posts: 75

**chemistry**

The equations for the heats of the formation of copper (I) oxide,Cu2O and copper(II) oxide,CuO are: 2Cu(s) +1/2 O2(g) CuO(s); ∆Hof =-166.7kj/mol Cu(s) +1/2 O(g) CuO(s); ∆Hof= -155.2kj/mol The first and second ionisation energies of copper are 750 and 2000kj/mol ...
*October 4, 2015*

**Physics**

how much heat is needed to vaporize a 400.0 g of liquid water at 310.0 K?
*September 23, 2015*

**math**

what are the three smallest 7 digit whole numbers that can be made using only the digits 4,3,0,9,2,8,and 5? Each digit must be used exactly one time in each number.
*August 25, 2015*

**math **

how many flowers can be planted in a flower bed 13 ft long at 13 inches apart?
*August 6, 2015*

**Physics**

A plane has a max speed of 200 km/h. What is the maximum speed it can travel due west if there's a northwest wind at 50 km/h?
*January 22, 2015*

**Geometry**

The second-largest state in the US is Texas, covering 268,580 square miles (including water). What is the approximate radius of a sphere with the same surface area as the area of Texas?
*October 24, 2014*

**network analysis**

Point A and B are 0.1m apart. A Point charge of +3.0*10^-9 c is placed at A and a point charge at -1.0*10^-9c B. X is the point on the straight line between A and B where the electric potential is zero. calculate the distance AX
*September 21, 2014*

**d,m,v**

whats the volume of benzene.?
*September 13, 2014*

**geometry maths**

A piece of wire 30 cm long is cut into two pieces. One of these is bent into a circle, and the other is bent into a square enclosing the circle, as shown in the diagram. What is the diameter of the circle? (Remember that the circumference of a circle = 2 pi r.
*April 3, 2014*

**Science :)**

The answer to 4 on Princess Anna's isn't D it is A. Weigh the costs and benefits of building a shopping mall near the river. I just did the test that's the only one I missed.
*December 18, 2013*

**Math **

Suppose you are comparing two numbers that are greater than 1,000. You want to find the smaller of the numbers. How many pairs of digits might you have to compare before you have your answer? Explain.
*September 5, 2013*

**Chemistry**

Calculate the molar concentration of uncomplexed Zn2+ (aq) in a solution that contains 0.22 mol of Zn(NH3)4 2+ per liter and 0.3109 M NH3 at equilibrium. Kf for Zn(NH3)4 2+ is 2.9 X 10^9 I started this way... (0.3109 + 4)2/0.22-x)= 2.9 X 10^9
*March 18, 2013*

**Chemistry (reposting)**

In which of the following solution would CaC2O4 have the highest molar solubility? Please help. A) 0.01 M NaCl B) 0.01 M H2C2O4 C) 0.01 M Na2C2O4 D) 0.01 M NaHC2O4 E) 0.01 M HCl I think it is E because it is a strong acid and will completely dissociate
*March 18, 2013*

**Chemistry**

Calculate the molar concentration of uncomplexed Zn2+ (aq) in a solution that contains 0.22 mol of Zn(NH3)4 2+ per liter and 0.3109 M NH3 at equilibrium. Kf for Zn(NH3)4 2+ is 2.9 X 10^9 I started this way... (0.3109 + 4)2/0.22-x)= 2.9 X 10^9 I'm lost and cant figure out ...
*March 17, 2013*

**Chemistry**

In which of the following solution would CaC2O4 have the highest molar solubility? Please help. A) 0.01 M NaCl B) 0.01 M H2C2O4 C) 0.01 M Na2C2O4 D) 0.01 M NaHC2O4 E) 0.01 M HCl I think it is E because it is a strong acid and will completely dissociate..
*March 17, 2013*

**physics**

A cue ball rolling across a pool table at 5.7 m/s collides with a stationary eight ball of equal mass. The cue ball stops after the collision. What is the velocity of the eight ball after the collision?
*March 10, 2013*

**english**

possessive pronouns of martha katz's?
*February 13, 2013*

**science**

A solution contains 2 mEq/mL of KCL (Molecular weight 74.5). If a 20 mL ampule of this solution is diluted to 1 liter what is the percent strenght of the resulting solution?
*January 14, 2013*

**Physics**

(5x^-3)^2
*September 5, 2012*

**math**

8(x+1/2)=2x+4
*January 11, 2012*

**math**

30=3c+2(3c-3
*December 13, 2011*

**math **

3(d+2)-d=16
*December 13, 2011*

**English**

(This homework question has been removed because it was copied directly from a test.)
*November 28, 2011*

**Geometry**

Explain whether the following statement is a valid definition: “A 30° angle is an acute angle.” Use the converse, biconditional, and at least one Euler diagram to support your answer.
*November 28, 2011*

**math**

(from current question)5x+negative13x+6x+4x simplify
*November 16, 2011*

**math**

(from current question)14x+20y+negative17y+negative17x
*November 16, 2011*

**math**

5x+negative13x+6x+4x
*November 16, 2011*

**math**

14x+20y+negative17y+negative17x
*November 16, 2011*

**math**

what is the percent of 438 to 789
*October 20, 2011*

**math**

how you figure percents like percent of438 to 789
*October 20, 2011*

**science**

How many years after voyage 2's launch was it before scientists could view its photographs of Uranus?
*October 14, 2011*

**math**

the arcade has three pinball machines and five video games.If a person wants to play one pinball machine and one video game,how many different combinations of games could that person play?
*October 4, 2011*

**math**

fraction for15%
*October 3, 2011*

**math **

i need the fraction for3/8
*October 3, 2011*

**math**

a percent for 0.9 decimal
*October 3, 2011*

**math**

9/10 its the right answer
*October 3, 2011*

**math**

a fraction for 0.9 decimal
*October 3, 2011*

**math**

a percent for 3/8
*October 3, 2011*

**math**

convert 15% into a fraction
*October 3, 2011*

**math**

the decimal for 15%
*October 3, 2011*

**math**

find a fraction of 20%
*October 3, 2011*

**science**

why do you think that people choose to live in places where earthquakes are common
*September 27, 2011*

**math **

Mr.Garica's class is harvesting the school garden.The rectangular garden is twenty-five feet by fifteen feet.What is the area of the garden?
*September 26, 2011*

**math**

What the density of 16/2
*September 21, 2011*

**math**

how many feet are in 261.32 yards
*September 20, 2011*

**math **

what is 1/3of 98
*September 20, 2011*

**math**

the melt in your mouth chocolate factory is a rectangular building.The distence across the front of the store is 98 yards.The distance from the front to the back one-third of this distance.If the owners paint a sign all the way around the outside of the factory,how many feet ...
*September 20, 2011*

**math **

square roots to the nearest tenth of 42
*September 20, 2011*

**math**

find the square root to the nearest tenth of 13
*September 20, 2011*

**math**

square root of 64 and the square -64
*September 20, 2011*

**math **

the two square roots of 9 are 3 and what
*September 20, 2011*

**math**

the melt in your mouth chocolate factory sells three times as many mints as it sells almond bars.it sells half as many almond bars as it sells caramels.if it sells 3,750 cases of mints each month,how many caramels does it sell in one month
*September 20, 2011*

**math**

find the prime factorization of 175
*September 20, 2011*

**math**

ms.sue the answer you gave me is not to helpful without a diagram of composite and odd numbers 20-35
*September 20, 2011*

**math**

i need to complete a venn diagram using the numbers 20-35 please help me drawing a venn diagram.
*September 20, 2011*

**math**

what is the scientific notation for 1,890,000 and 7,426,000
*September 20, 2011*

**math**

i need to cmplete a venn digram of composite and odd using the numbers 20-35.
*September 20, 2011*

**math**

what is the scientfic notation of35,000and982,000,000
*September 15, 2011*

**math**

write in scientific notation 35,000 and 982,000,000
*September 15, 2011*

**math **

what is the fraction form of 5.1
*September 14, 2011*

**math**

which of the following numbers are integers?8,1-1/2,0,-1,3.1
*September 14, 2011*

**math**

Polk Elementary School has three classes for each grade level,kindergarten through fifth grade.If there is an average of 27 students per classroom,about how many students attend Polk Elementary School?
*September 14, 2011*

**algebra**

25 divided 0.76 in long formed
*September 11, 2011*

**chemistry**

If 50.0 g of sodium bicarbonate is reacted and 11.0 g of carbon dioxide is produced, what is the percent yield of carbon dioxide? 2NaHCO3 --> Na2CO3 + CO2 + H2O
*April 6, 2011*

**English**

What has a lot of power and start with with a "s" and ends with a "l".
*March 2, 2011*

**calculus**

If g is a differentiable function such that g(x) is less than 0 for all real numbers x and if f'(x)=(x2-4)g(x), which of the following is true? f has a relative maximum at x=-2 and a relative minimum at x=2, f has a relative minimum at x=-2 and has a relative maximum at x=...
*January 2, 2011*

**math**

on monday 86 science fiction books were sold at a book sale this is 8 more than twice the amount sold on thursday how many science fiction books were sold on thursday
*November 29, 2010*

**Math**

there were 10 quizzes. the range was 38. the mean was 90. there was one outlier. few students got 100. Find the sum of the 10 quiz.
*April 22, 2010*

**economics**

A professor of economics gives multiple choice exams each semester. He curves the exams by giving the maximum possible points to the high score on the exam. For example, if a 50 question exam is worth 100 points and the top score in the class is 40, then each question is worth...
*November 24, 2009*

**Chemistry**

C5H12 + 8O2 > 5CO2 + 6H2O
*November 6, 2009*

**6th grade Math**

what is the volume of 12 in 10 in 5 in
*March 2, 2009*

**English IV Honors**

The question already has all the answers...
*November 12, 2008*

**math**

which of the following numbers are integers?81/2,0,-1,3.1
*September 10, 2008*

**english vocab word**

I need a vocabulary word that means a lot of power and starts with a "s" and ends with a "l".
*November 5, 2006*

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