just one question how do you find the constant k???
how many half lives have passed if only 0.625g remain of the original 40g?
Thank you very much Reiny and also Damon. This is the first time I felt embarrassed helping my son. Sign of things to come of course. As Reiny suggested, we ended up plotting and then selecting less than half a dozen candidates. I also cheated and made a spreadsheet just to sp...
My son has been given the collinear problem below that has be stumped two folds. 1- By trying to solve the problem using (y2-y1)/(x2-x1)=slope -- and then, find the (b) in y=mx+b for two points takes way way too long to be a 7th grade probem. My son has already been working on...
I got 7516.88J for ?J and mass of soln = 158.2g So my equation is 7516.88 J = 158.2g x 3.78 J/(g·°C)x(Tfinal -21.87) 12.57 = Tfinal - 21.87 Tfinal = 34.44°C Which was wrong. The hint they gave me was Start by finding the amount of heat produced when 70.0 mL of 0...
The neutralization of H3PO4 with KOH is exothermic. H3PO4(aq) + 3KOH(aq) -> 3H2O(l) +K3PO4(aq) +173.2KJ 70.0 mL of 0.207 M H3PO4 is mixed with 70.0 mL of 0.620 M KOH initially at 21.87 °C. Predict the final temperature of the solution if its density is 1.13 g/mL and its...
Can someone please help with this problem and explain it please? If soil has a density of 1.32 g/cm cubed, then what does 1.0 cubic yards of soil weigh in pounds?
1) Which large European city declined significantly in population over the past century? A) Paris B) London C) Rome D) Madrid 2) The industrial city was characterized b A) decentralization B) corporate growth C) manufacturing D) commerce 3) Modern humans have existed for abou...
34.5 g of O2 react with lithium metal to produce solid lithium oxide. How many grams of Li2O are produced