# Posts by CL

Total # Posts: 64

**Chemistry**

How much energy (in kj) is required to ionize 2.78 moles of hydrogen atoms the right answer is: 3.65x10^3 kj wondering how they got this answer.

*February 23, 2017*

**Chemistry**

Calculate the ionization energy (in kj) for a mole of hydrogen atoms, making the assumption that ionization is the transition from n=1 the correct answer is : 1.31x10^3 kJ

*February 23, 2017*

**Chemistry**

never mind! figured it out. forgot to multiply the velocity to 1%

*February 23, 2017*

**Chemistry **

what is the minimum uncertainty in the position of an electron moving at a speed of 4 x 10^6 m/s ± 1 %? I keep getting 1.44 x10^-11 m, but the right answer is 1x10^-9 m.

*February 23, 2017*

**Chemistry **

4.72 g of a compound of carbon, hydrogen, and silver was burned in an atmosphere of oxygen, yielding 7.95 g of CO2, 1.02 g of H2O and 3.02 g of a mixture of silver and silver oxide. Because the production of this mixture yielded an indeterminate value for the amount of silver...

*February 23, 2017*

**Chemistry **

Can geranium be used to detect infrared radiation emitted by a remote control device that has a wavelength of 902 nm? the work function (binding energy) of geranium is 7.61 x10^-19 J?

*February 23, 2017*

**Chemistry **

the lead (II) nitrate in 25.49 ml of a 0.1338M solution reacts with all of the aluminum sulfate in 25.00 ml solution. What is the molar concentration of the aluminum sulfate in the original aluminum sulfate solution? For a question like this how do I find out it is a 3:1 ratio...

*February 23, 2017*

**Chemistry **

the lead (II) nitrate in 25.49 ml of a 0.1338M solution reacts with all of the aluminum sulfate in 25.00 ml solution. What is the molar concentration of the aluminum sulfate in the original aluminum sulfate solution?

*February 22, 2017*

**Chemistry**

A 0.2638 g impure sodium carbonate sample is analyzied by titrating the sodium carbonate with the 0.1288 M hydrochloride solution requiring 38.27 mL. The reaction is CO3^2- + 2H^+ --> H2O + CO2 Calculate the percent sodium carbonate in the sample.

*February 21, 2017*

**physics**

4) An aircraft has a landing velocity of 50 ms-1 and decelerates uniformly at 10 ms-2 to rest . Calculate: (a) the time taken to slow down to this velocity (b) the distance covered during the deceleration

*February 8, 2012*

**physics**

Yea it's def c

*March 4, 2011*

**business research**

a. Employee job satisfaction (high, normal, low) and employee success (0-2 promotions, 3-5 promotions, 5+ promotions) are to be studied in three different departments of a company. b. Consumers making a brand choice decision between three brands of coffee are influenced by ...

*December 16, 2010*

**english**

Why is it more significant to write in the present tense when describing a person in comparison to writing in the past?

*July 5, 2010*

**Physics**

acceleration and velocity are two different things. try using.. d = vt + (1/2)a(t^2)

*July 5, 2010*

**physics**

acceleration = change in velocity / change in time so.. a = 10 - 0 / 1.35 a = 7.41 m/s^2

*July 5, 2010*

**math**

A straight road up a hill has a slope of 1/4. From the bottom of the hil to the top of the hill, the horizontal change is 80 m. Determine the height of the hill. I'm thinking that it's 80/4 = 20 m.. but I'm not 100% sure.

*July 5, 2010*

**physics - special relativity**

whoops.. wrote it wrong.. should be.. 0.6m = (mv) / (square root 1 - (v/c)^2) and that's as far as i got.. i don't know what to do from there or if it's the right equation :S

*June 7, 2010*

**physics - special relativity**

When a rocket is moving at a constant speed, it has a relativistic mass that is 60 percent greater than its rest mass. Find the speed of the rocket. **** So far, I tried using the relativistic mass equation.. 0.6m = mv / square root 1-(v/c)2

*June 7, 2010*

**Algebra**

-5x > 0 -5x/-5 > 0/-5 x < 0 since we are dividing by a negative, the inequality changes so, no the answer is not the same 9x > 81 x > 81/9 x > 9

*May 10, 2010*

**biology**

a) Explain why the knee-jerk reflex still functions in a person with a severed spinal cord. b) Why is there no sensation of the stimulus?

*May 10, 2010*

**math - classifying events**

A market survey has estimate that the probability of a household's subscribing to the following magazines is: Reader's Digest - 0.6 Chatelaine - 0.5 Maclean's - 0.4 Reader's Digest and Chatelaine - 0.2 Reader's Digest and Maclean's - 0.2 Chatelaine and ...

*May 6, 2010*

**math - combinations**

;S i checked the answer key and it says 6075

*April 13, 2010*

**math - combinations**

To study the unity of Canada, a seven=person committee is to be selected from five public figures from Western Canada, five public figures from Central Canada, and five public figures from Eastern Canada. I figured out parts a & b to this question, but I'm having troubles ...

*April 13, 2010*

**math - combinations**

Each hand in the game of bridge has 13 cards dealt from a regular deck of 52 cards. a) How many different bridge hands are possible? b) How many different bridge hands have all pour aces in them? c) How many different bridge hands have no aces in them? I figured out part A, ...

*April 13, 2010*

**math - permutations with factorials**

Over the past week, an airline pilot was n Vancouver three days, Calgary two days, Whitehorse one day, and Winnipeg two days. a) How many different itineraries could the pilot have had? b) If you knew that the two days in Calgary were consecutive (a layover), how many ...

*April 9, 2010*

**jsp**

can you modify an attribute of the application object after it has been set?

*April 8, 2010*

**math**

Louis Braille devised a system of six raised or not-raised dots to signify a letter of the alphabet. a) How many different letters or characters may be coded in Braille? b) If you wanted to code 94 distinct characters, such as those found on a computer keyboard, how mant dots ...

*April 7, 2010*

**math**

Samuel Morse developed a character coding system that was used to send messages along telegraph lines and also for light signalling between ships. Morse code is based on a series of dots and dashes (short of long bursts). The most frequently used letter, E, is coded as a ...

*April 7, 2010*

**math**

part a.. should be 5, 0.125 10, 0.0625 as you move down the y-values.. you can see the pattern that they go down by half each time.. so from 0.25, decrease that by half and so forth.

*April 7, 2010*

**math**

i don't get where the horizontal displacement of +30 comes from :S

*March 29, 2010*

**math**

A ferris wheel has radius of 25 m and its centre is 27 m above the ground. It rotates once every 40 seconds. Sandy gets on the ferris wheel at its lowest point and the wheel starts to rotate. Determine a sinusodial equation that gives her height, h, above the ground as a ...

*March 29, 2010*

**math**

is there a formula for an INFINITE ARITHMETIC series/sequence? i know its not s = a / 1-r.. that's for geometric.

*March 4, 2010*

**math 12 - sequences and series**

Given the expression Sn = n^2 + 2n for the sume of the first n terms of a series, determine a) An expression, in simplified form, for Sn-1 in tmers of n b) an expression, in simplified form, for the nth terms, tn in terms of n

*March 1, 2010*

**chemistry**

What weight of H2 at STP could be contained in a vessel that holds 4g of oxygen at STP? First, I used the Ideal Gas Law to find the volume of oxygen at STP, but im not sure what to do from there..

*January 27, 2010*

**biology**

Compare the chemical composition of the contents of the stomach one hour after eating a meal containing proteins, carbohydrates, and fats, to the contents of the small intestine several hours later.

*January 25, 2010*

**math i need help please**

b/2-15 = 16 b/2 = 16 + 15 b/2 = 31 b = 31 * 2 b = 62 answer A!

*January 25, 2010*

**biology**

Compare the chemical composition of the contents of the stomach one hour after eating a meal containing proteins, carbohydrates, and fats, to the contents of the small intestine several hours later.

*January 25, 2010*

**chemistry**

yes we did. so would it slow or speed up the rate of the reaction?

*January 22, 2010*

**chemistry**

today, i did a lab on the molar volume of hydrogen gas. in this experiment, we poured around 10 mL of hydrocholric acid into a gas collection tube with water and measured the volume of gas to be around 20.9 mL. would changing the molarity of the hydrochloric acid affect the ...

*January 22, 2010*

**french**

in correspondance to my last post.. i was wondering.. how does one say "you know me better than that!" in french? that's wat i meant when i wrote.. Tu dois me savoir mieux que cela!

*January 22, 2010*

**french**

can someone please edit this for any spelling/grammar mistakes? it's a skit on french expressions. N: Bonjour, Cynthia. C: Bonjour, Neal! N: Comment-ça va? C: Ça va bien, mais je suis très fatigué! N: Oh? Pourqoui es-tu fatigué? C: Parce-...

*January 21, 2010*

**Pre-Algebra**

225 + 324 = c^2 549 = c^2 take the square root of 549. c = 23.4

*January 14, 2010*

**math**

o____O how did you get to that value? can you show me how to solve it algabraeically?

*January 14, 2010*

**math**

Solve for x: sin2x + cos^2x = 1 0° < or equal to x < 360°

*January 14, 2010*

**math**

Solve for x: 2x^3 + 9x^2 +10x +3 =0

*January 13, 2010*

**math**

nevermind, i understand!

*January 13, 2010*

**math**

how did you get 210 and 330? =S

*January 13, 2010*

**math**

Solve: tanx - 2sin2x = 0 0°< or equal to x < 360°

*January 13, 2010*

**Math**

35/185 = x/100 x = [100 * 35] / 185 x = 18.9%

*January 12, 2010*

**math**

60/180 = x/100 x = [60 * 100] / 180 x = 33%

*January 12, 2010*

**math**

70/100 = x/3000 x = [3000 * 70] / 100 x = 2100

*January 12, 2010*

**math**

28/x = 40/100 isolate x x = [100 * 28] / 40 x = 70 so you are correct, it is answer c

*January 12, 2010*

**chemistry**

When I measure pressure in relation to depth, I found that as the depth increases, so does the pressure. I experimented this in a LARGE graduated cylinder. What would be the difference if I used a SMALL graduated cylinder versus a large one? What is the evidence for this? And ...

*January 12, 2010*

**chemistry**

When I measure pressure in relation to depth, I found that as the depth increases, so does the pressure. I experimented this in a LARGE graduated cylinder. What would be the difference if I used a SMALL graduated cylinder versus a large one? What is the evidence for this? And ...

*January 12, 2010*

**8th grade Math**

17x - 89y combine the like terms (8x and 9x)

*January 12, 2010*

**chemistry**

Thank you! What would be the difference if a small graduated cylinder was used instead of a large one? The pressure would still increase as the depth increases? What about the molecules?

*January 11, 2010*

**chemistry**

I did a lab on pressure and depth today. This lab was to simply submerge a plastic tube into a large graduated cynlinder to find the relationship between the two. I found that as the depth increases, so does the pressure. One of the questions I'm stuck on for part of my ...

*January 11, 2010*

**programming**

I am supposed to modify this program so it begins by asking the user for the number of values. The program then uses a loop to read the specified number of values and then display their average. program is below that i worked on in class. I been working on this all day and ...

*September 2, 2009*

**visual basic**

here is my source code for my program im trying to convert 10 units from furlong to meters the answer is supposed to be 2011.68 meters i keep getting 2000. I know if i cant get this right the rest of the conversion will give the wrong answers anybody have any ideas? Dim inch ...

*May 8, 2009*

**visual basic**

Doing a units of measurement program don't know what the formula i need to use to convert the units? Also was wondering how do i get the answer to show at least 3 decimals places im getting to many numbers for my results? Should i declare them as a double or a long? inch...

*May 8, 2009*

**visual basic**

Cant get my message dialog box to display anbody see waht wrong with it? The message box is located in my if then else statement Dim total As Integer = 0 Dim gradeCounter As Integer = 0 Dim grade As Integer = 0 Dim average As Double = 0 ' sum grades in ListBox Do ' ...

*May 7, 2009*

**Accounting II**

In am month in which 30,000 equivalent full units are produced, Manufacturing overhead should be? Units Manufacturing overhead hi 117,000 306,000 low 81,000 234,000 The answer is 132,000(I need to know what steps they did to figure that out)

*November 11, 2008*

**science**

diluted?

*September 11, 2008*

**Spelling**

1 word 2 meanings. My child has an assigment and the teacher wants 2 meanings for each word. What is this? I think it either means: flower and flour or whirligig-which can mean a childs top, and round circular thing, anything that revolves. I hope this helps. If I have not ...

*October 11, 2006*

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