Recent content by MellowOne

I figured it out, I forgot a step and yeah I just looked at it again and realized I put the wrong conversion.

Homework Statement Fluoride ion is poisonous in relatively low amounts: 0.2 g of F - per 70 kg body weight can cause death. Nevertheless, in order to prevent tooth decay, F - ions are added to drinking water at a concentration of 1 mg of F - ion per L of water. How many kilograms of sodium...

Ok, I got it...I just took the derivative of the distance formula which would make it into the velocity formula. Then I set the velocity equal to 0 and used the quadratic equation to find t.

Homework Statement A car is stopped at a traffic light. It then travels along a straight road so that its distance from the light is given by x(t) = bt^2 - ct^3, where b = 2.30 m/s^2 and c = 0.120 m/s^3. How long after starting from rest is the car again at rest? Homework Equations...

Homework Statement A sample of 5.53g of Mg(OH)2 is added to 25.0mL of 0.200M HNO3. How many moles of Mg(OH)2, HNO3, and Mg(NO3)2 are present after the reaction is complete? Homework Equations M = mol/L The Attempt at a Solution The balanced equation for the reaction is Mg(OH)2 +...

Sorry, maybe I should have put the function that I was given. I'm not sure what F! means, but here's the function I'm given. F(x) = (x^3 - 7x^2 + 17x - 15)/( x - 3) It is a continuous graph, but at x = 3 there's a point of discontinuity which is (3,2).

Homework Statement For the statement "If x is within _______ units of 3 (but not equal to 3), then f(x) is within 0.01 unit of 2," write the largest number that can go in the blank Homework Equations Nonr The Attempt at a Solution It's a multi-step problem, but the two numbers I...

okay thank you i got it!

but we don't know how many grams we have of chlorine...?

A 2.80g sample of an unknown chlorofluorocarbon is decomposed and produces 552mL of chlorine gas at a pressure of 756 mmHg and a temperature of 298K. What is the percent chlorine (by mass) in the unknown chlorofluorocarbon? PV= nRT D= m/vOk, so for this problem I tried using the PV=nRT...

Homework Statement The balanced net ionic equation for precipitation of CaCO3 when aqueous solutions of Na2CO3 and CaCl2 are mixed is _____. Homework Equations Not sure of any The Attempt at a Solution I'm not sure how to get a "net ionic equation." I took chemistry 2 years ago and...

I actually figured out the question already. Thanks for the help though. Looking at what you did before I got through most of it. The only part that still puzzles me is why the distance you use to get the correct answer is 4m when in reality the answer should be found using 5.65m which is from...

Well I tried using 0 as an answer but it wasn't right. Here's my new thought process. What if we found the distance it traveled using what we know? It traveled 4 m to the right and 4 m up. So using a^+b^2 =c^2 we can find the distance which was 5.65685m. Now this is the part I'm stuck. Since W =...

KEf = KEi It wouldn't be 0 would it? Edit: Cause work HAD to be done to move the body.

Is that KEf - KEi = Total Work?