Friday

September 19, 2014

September 19, 2014

Total # Posts: 92

**Chemical**

Ok thanks a lot for your help I understand it now :D
*September 14, 2014*

**Chemical **

The molar enthalpy of solution for ammonium chloride is 14.8kJ/mol. What is the final temperature observed when 20.0g of ammonium chloride is added to 125mL water at 20.0'C?
*September 14, 2014*

**Chemistry**

ok thanks
*September 13, 2014*

**Chemistry**

For the following equation, write a thermochemical equation that includes an energy term within the equation: The formation of 1 mol of copper(II)chloride from its elements releases 220.1kJ of energy.
*September 13, 2014*

**Chemistry**

Ok thanks again for all your help :D
*September 13, 2014*

**Chemistry**

ok thanks a lot for your help but why did you put a question mark after the > in the equation you gave?
*September 13, 2014*

**Chemistry**

What do you mean?
*September 13, 2014*

**Chemistry**

Rewrite the following using a thermochemical equation with a deltaH value: a) The standard molar enthalpy of combustion for propane is -2220kJ/ mol.
*September 13, 2014*

**Physics**

Assuming the best high jump record from a standingposition in a school was 1.52 m, what initial velocity was needed for this jump? Neglect any sideways motion.
*June 15, 2014*

**Physics**

wait nvm
*June 14, 2014*

**Physics**

If I send you a link could you take a look at it?
*June 14, 2014*

**Physics**

A 45-t electric train accelerates uniformly from a station with the train’s motion depicted in the graph in Figure 2.(Recall that 1 t = 1.0 × 103 kg.)Determine the net force acting on the train during the uniform acceleration portion of the motion.
*June 14, 2014*

**Physics**

Alright thanks a lot mate :D
*June 14, 2014*

**Physics**

The Yukon Quest, an annual dog-sled race between Whitehorse in the Yukon and Fairbanks in Alaska, covers a gruelling distance of 1.61 × 103 km. Assuming that the average speed of the dog team that set a course record is 6.28 km/h, determine the best time for this race. ...
*June 14, 2014*

**Math**

I know
*June 11, 2014*

**Math**

Use partial factoring to determine the vertex of y=3x^2+5x-1.
*June 11, 2014*

**Math**

oh ok thanks a lot for your help :D
*June 11, 2014*

**Math**

angle theta is in the standard position and 0'=<theta=<180'. If cos theta = -2/3, find the exact value of sin theta* tan theta.
*June 11, 2014*

**Math**

thanks for you help :D
*June 10, 2014*

**Math**

The doubling period of a bacteria culture is 35 minutes and it starts with 1400 bacteria. How many bacteria will there be after 3 hours? Round your answer to the nearest tenth.
*June 10, 2014*

**Maths**

ok thanks a lot for your help :D
*June 10, 2014*

**Maths**

The average depth of the water in a port on a tidal river is 4 m. At low tide, the depth of the water is 2 m. One cycle is completed approx every 12 h. a) find an equation of the depth d(t) metres, with respect to the average depth, as a function of the time, t hours, after ...
*June 10, 2014*

**Math**

sorry it should be corrected to t
*June 10, 2014*

**Math **

Determine the number of triangles that could be drawn with the given measure. Then, find the measures of the other angles and the other side in each possible triangle. Round side lengths to the nearest tenth of a unit and angle measure to the nearest tenth of a degree, where ...
*June 10, 2014*

**Math**

Ok thanks a lot for your help steve :D
*June 10, 2014*

**Math**

How do you know what the period of this function is: y=2cos3(x+45')? Explain.
*June 10, 2014*

**Math**

ok thanks a lot for your help :D
*June 9, 2014*

**Math**

Determine the number of triangles that could be drawn with the given measure. Then, find the measures of the other angles and the other side in each possible triangle. Round side lengths to the nearest tenth of a unit and angle measure to the nearest tenth of a degree, where ...
*June 9, 2014*

**Maths**

but that wasn't the correct answer
*June 9, 2014*

**Maths**

Find the maximum or minimum value of function and the value of x when it occurs: -2x^2+5x+5.
*June 9, 2014*

**Math**

wait nvm thanks for your help :D
*June 9, 2014*

**Math**

so can you show me the correct way to do it?
*June 9, 2014*

**Math**

but the answer says that it's a max of 65/8 at x=5/4
*June 9, 2014*

**Math**

Find the maximum or minimum value of function and the value of x when it occurs: -2x^2+5x+5.
*June 9, 2014*

**Chemistry**

ok thanks :D
*May 30, 2014*

**Chemistry**

A sample of hydrogen gas is collected by water displacement at 20.0'C when the atmospheric pressure is 99.8kPa. What is the pressure of the dry hydrogen, if the partial pressure of water vapour is 2.33kPa at that temperature?
*May 30, 2014*

**Chemistry**

I figured it out thanks for your help :D
*May 30, 2014*

**Chemistry**

I got 1.7*10^4L but not sure if I was correct or not
*May 30, 2014*

**Chemistry**

A tank of chlorine gas contains 25.00 kg of pressurized liquid chlorine. If all the chlorine is released in its gaseous for at 17'C and 0.98atm, what volume does it occupy?
*May 30, 2014*

**Math **

If 5+x, 8, and 1+2x are consecutive terms in an arithmetic sequence, find x.
*May 29, 2014*

**Math**

A doctor prescribes 200 mg of medication on the first day of treatment. The dosages is halved on each successive day for one week. To the nearest milligram, what is the total amount of medication administered?
*May 29, 2014*

**Math**

Find the sum of the arithmetic series -12-9-6-...39.
*May 28, 2014*

**Math**

How do you get the values?
*May 28, 2014*

**Math**

A tractor-trailer worth $84 000 depreciates 20% the first year and 10% each year thereafter. How much is it worth after 5 years?
*May 28, 2014*

**Math**

wait I understand thanks for your help :D
*May 28, 2014*

**Math**

why didn't you use this equation: 765=3(2)^n-1
*May 28, 2014*

**Math**

How many terms of the series 3+6+12+24+...add to 765?
*May 28, 2014*

**Maths**

like sorry for the sequence 1, 4, 16 how did you get 1?
*May 24, 2014*

**Maths**

I have one last question. How did you know a=1?
*May 24, 2014*

**Maths**

alright thanks :D
*May 24, 2014*

**Maths**

by the way did you multiply the equation by 10 to get rid of the decimal to get a whole number?
*May 24, 2014*

**Maths**

Thanks for your help :D
*May 24, 2014*

**Maths**

A geometric series has three terms. The sum of the three terms is 42. The third term is 3.2 times the sum of the other two. What are the terms?
*May 24, 2014*

**Math**

ok thanks
*May 24, 2014*

**Math**

A ball is thrown 16 m into the air. The ball falls, rebounds to half its previous height, and falls again. If the ball continues to rebound and fall in this manner, find the total distance the ball travels until it hits the ground for the sixth time.
*May 24, 2014*

**Chemistry**

ok thanks a lot for your help :D
*May 17, 2014*

**Chemistry**

so then would the answer be 2.07?
*May 17, 2014*

**Chemistry**

The temperature of a 2.25L sample of gas decreases from 45.0'C to 20.0'C. What is the new volume?
*May 17, 2014*

**Math**

thanks a lot for your help!
*May 11, 2014*

**Math**

Canada ranks fifth in the world in the production of gold. By the end of one year, one of Canada's mines had produced about 198 t of gold since it opened. if the annual production averaged 4.5 t, predict the total production by the end of next year and the year after that
*May 11, 2014*

**Math**

A Canadian zoo started with 16 whooping cranes and planned to hatch 20 chicks a year. A few birds were kept for breeding and the rest released into the wild. At the end of last year, a total of 136 cranes had spent some time in the zoo. If the pattern continues, how many ...
*May 11, 2014*

**Physics**

Hey thanks a lot but how did you know to put 8/(24)?
*May 1, 2014*

**Physics**

Find the equivalent resistance in 16 ohm and 8.0 ohm connected in parallel.
*May 1, 2014*

**Physics**

Find the equivalent resistance in 16 ohms and 8.0 ohms connected in parallel.
*April 30, 2014*

**Math**

Alright thanks a lot :D
*April 26, 2014*

**Math**

An exponential function with a base of 3 has been vertically stretched by a factor of 1.5 and reflected in the y-axis. Its asymptote is the line y=2. Its y-intercept is (0,3.5). Write an equation of the function and state its domain and range.
*April 26, 2014*

**chemistry**

Thanks :D
*April 20, 2014*

**chemistry**

can you please show me the proper way to do it?
*April 20, 2014*

**chemistry**

Yes but the answer was incorrect
*April 20, 2014*

**chemistry**

HCL acid is available as a stock solution with a concentration of 10 mol/L. If you need (9.0*10^-1) L of (2.50*10^0) mol/L hydrochloric acid, approximately how much distilled water will you need to make the dilution?
*April 20, 2014*

**chemistry**

Thank you for all your help it was much appreciated :D
*April 20, 2014*

**chemistry**

When I did the equation you gave me I got 483mL but that wasn't the answer.
*April 20, 2014*

**chemistry**

but doesn't the litres in the mol/L have to be converted to mL?
*April 20, 2014*

**chemistry**

HCL acid is available as a stock solution with a concentration of 10 mol/L. If you need (2.100*10^0) L of (2.3*10^0) mol/L hydrochloric acid, approximately how much distilled water will you need to make the dilution?
*April 20, 2014*

**Math**

Type Amount Recycled (%) Amount Recycled (in millions of tons) Paper and Paperboard 52.8 45.9 Yard Trimmings 22.2 19.3 Metals 8.6 7.5 Glass 3.7 3.2 Plastics 3.1 2.7 Wood 2.7 2.3 Food waste 1.6 1.4 Other 5.3 4.6 Date US Population Jul 1, 2012 313.85 million Jul 1, 2011 311.59 ...
*March 20, 2014*

**Math**

1. You want to deliver an article with the most impact and easy reading to the readers; you decide that you need to present the data as percentages. For each of the data statements, though, none of them have percent’s. Convert each statement’s data into a percentage...
*March 20, 2014*

**accounting**

11422 4572 812 4518
*October 2, 2012*

**math**

if the area of a rectangle is 27 square inches and one side is 3 inches how many square inches is the other side
*March 12, 2012*

**physics**

An electric motor is tested and found 76% efficient. if the input work is 400 J, what is the motors output work?
*June 11, 2011*

**7th grade**

english: how are you supposed to make a person that bribes people to a character trait
*October 31, 2009*

**Econimics**

Is president Obama's plan for health care reform socialism or common sense " mixed economy" approach in the economic and political mainstream of America? How would Adam Smith have used the free market to solve our health care problem? What other models exist for ...
*October 18, 2009*

**Repost physics**

thank you damon
*September 15, 2009*

**Repost physics PLEASE HELP IS NEEDED**

pweasey-weasy?
*September 15, 2009*

**Repost physics**

Suppose the position of an object is given by ->r(vector) = (3.0t^2*ihat - 6.0t^3*jhat)m. Where t in seconds. Determine its velocity ->v as a function of time t. Determine its acceleration ->a as a function of time t. Determine ->r at time t = 2.5 s. Determine ->...
*September 15, 2009*

**chem**

The bond enthalpy of N2(g) is 418.0 kJ/mol. Calculate ÄH°f for N(g). I figured that if it gave the enthalpy for N2, then the enthalpy for N would be half of the given amount. But that wouldn't be bonded to anything?? Is there a standard calculation?
*April 15, 2009*

**bio - cell and molec**

for what values of delta G would the following reactions have? (no numerical value, just positive or negative) a. ATP -> ADP + P(subscript i) b. ADP + P(subscript i) -> ATP c. Glucose -> Pyruvate d. glocose -> oxygen e. starch -> glucose
*April 1, 2009*

**chem**

NO2(g) → ½N2(g) + O2(g) DH1 = -33.9 kJ NO2(g) → NO(g) + ½O2(g) DH2 = 56.5 kJ What is DH for the reaction ½N2(g) + ½O2(g) → NO(g) ?
*March 7, 2009*

**college gen chem**

A quantity of 16.13 mL of a KOH solution is needed to neutralize 0.4883 g of KHP. What is the concentration (in molarity) of the KOH solution?
*March 2, 2009*

**physics**

i am not sure
*June 12, 2008*

**social studies/ state goverment**

what is the vehicle registration in Minnesota? and what is the driver licensing location in Minnesota?
*May 17, 2008*

**Romeo and Juliet (English Literature)**

1. To what heavenly body does Romeo compare Juliet? Why is this so? 2. What does Juliet mean when she says to Romeo, "tis, but thy name that is my enemy?" 3. How is Romeo let to Juliet's home? 4. Is it difficult for Romeo to win Juliet's love? Why? 5. Why ...
*October 31, 2007*

**Air pollution analysis**

What are the effect of the following on demand for gas/oil/highways/airpollution? 1. a 900 annual tax on vehicle that gets less than 20 mil/gallon 2. 2000 annual income tax credit for owners of hybrids 3. income tax surcharge that lowers disposabl income to reduce demand for ...
*November 4, 2006*

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