# Posts by krys

Total # Posts: 28

**Chemistry**

Thanks for the clarification and confirming my assumption. I'll be sure to use accurate values in the calculation.

**Chemistry**

So I have to find the % by mass of an unknown metal that reacted with HCl to create MCl2 (with the M being unknown). Then I need to determine identity of the missing metal. I know that the final mass of the compound MCl2 is 12.47g and that the original mass of the metal M ...

**Calculus**

Whoops, sorry about that. It does seem like you still wind up with 1/0. Hmm... let's see when you graph it it looks like it's approaching -infinity so that's probably why you keep winding up with 1/0 since that will give you infinity technically. Also, I don't ...

**Calculus**

Use L'hopitals rule to find the limit. If you take the derivative of the top, and the derivative of the bottom derivative of lnx = (1/x) and the derivative of x = 1 You should be able to eliminate your problem with the 0.

**Physics**

A truck with a mass of 2200 kg, moving at 31 m/s (69 mph), crashes into an immovable wall. It crumples; after the collision, the truck is 0.65m shorter in length than it was before. What is the average speed and how long did the collision last? I was confused on how to start ...

**Algebra**

Mary is y years old. Write an algebraic expression in terms of y for the age of A) her brother, who is 4 years older. B) her mother, who is 3 times as old. C) her sister, who is 2 years younger.

**Algebra**

= (3*6+2s*6)+ 4(s+8) = (18+12s) + 4(8+s) = 18 + 12s +(8 * 4 + s *4) = 18+12s + (32 + 4s) =18+32 + 12s + 4s = 18 +32=50 = 12s+4s= 16s = 2(25+8s) Is my answer right? Thanks

**Algebra**

6(3+2s) + 4(s + 8) =

**Math**

Everyday Ms. Twinkle walks around a park near her house. The park is in the shape of rectangle 2 mi long and 1 3/10 mi wide. How far does she walk?

**Math**

What is 2/3 * 5/6 * 14 = Simplify if necessary

**physics**

A 0.230-kg block along a horizontal track has a speed of 1.70 m/s immediately before colliding with a light spring of force constant 48.0 N/m located at the end of the track. What is the spring's maximum compression if the track is frictionless?

**Math**

6 faces, 8 vertices and 12 edges

**Math**

how many faces does rectangular prism have? and How many vertices does rectangular prism have?

**statistics**

if 20% of the people in a community use the library in one year, find these probabilities. a) at most 3 people used the library b) exactly 3 people used the library c) at least 5 people used the library

**statistics**

if 20% of the people in a community use the library in one year, find these probabilities

**chemistry/ electrochemistry**

1. What is the value of the equilibrium constant for the reaction occurring in the cell shown below at 298 K? Ag(s) | Ag+(aq, 1 M) || Cu2+(aq, 1 M) | Cu(s) Report your answer to four significant figures in scientific notation (1.234E-3 or 1.234E3). Can anyone explain the steps...

**Chemistry**

To determine the value of ÄG°f(AgI2–(aq)), a researcher measured the concentrations at equilibrium to be: [I3–]eq = 4.07 M and [I2]eq = [AgI2–]eq = 0.686 M at 298 K. 2 Ag(s) + 2 I3–(aq) <------> 2 AgI2–(aq) + I2(aq) ÄH°f(kJ/mole...

**Science Half Lives**

2.7 days.. so the answer is 25 g ?

**Science Half Lives**

I am confused about how to claculate half lives. Can you explain. ( How much of a 400 gm sample od gold is left after 10.8 days if the half life is 2.7)

**11th grade Physics**

Consider a situation in which your car, when coasting down a straight downhill road, acquires a constant velocity. In this situation: a. gravity is the only force on the car b. friction is the only force acting on the car c. the net force acting on the car is zero d. there ...

**12th grade**

-3674 as stated in Newton's Third Law of Motion

**history**

how did the factors of population,economics,disease and climate shape the basic social conditions and ways of life in both the south and new england?

**8th grade**

n+3=12 12 - 3 _____ 9 n+3=12 CHECK IT! 9+3=12 9 n=9 +3 ___ 12 TADA!!!

**physics**

sqrt (130^2 + 4500^2) = 4501.8 N tan(angle) (4500.0/130.0)

**Math**

Oh, okay. Well, I've seen this before: 2x + 3y > 0

**Math**

I am in dire need of assistance. Can anyone tell me the forumula/solution to transforming inqualities into equivalent inequalities with y alone on one side? I really don't understand this.

**Geography/auto Industries**

What government imposed barries stop or hinder the export of automobiles? In almost all cases, trade barriers are imposed to restrict IMPORTS. Is that what you meant? India was a prime example, but that situation is changing. There were others.

**Physics**

Look up or derive the frequencies of the standing waves of a length of wire, L, clamped at the ends and under tension. What are the similarities and differences between a vibrating string and a resonating pipe? Does the diameter of the wire matter? Does the diameter of the ...

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