some kid

An unknown compound contains only the three elements C,H, and O. A pure sample of the compound is analyzed and found to be 65.60 percent C and 9.44 percent H by mass. a.)Determine the empirical formula of the compound. b.)A solution of 1.570 grams of the...

16 years ago

The identity of an unknown solid is to be determined. The compound is one of the seven salts in the following table. Al(NO3)3•9H2O BaCl2•2H2O CaCO3 CuSO4•5H2O NaCl BaSO4 Ni(NO3)2•6H2O Use the results of the following observations or laboratory tests to ex...

16 years ago

Find the antiderivatives. 1) çãx (x+1) dx 2) ç(x^3-4)/ (x^2) dx 3) ç(3sinx) dx 4) ç(5secxtanx) dx 5) ç(1/x) dx 6) ç(e^x - 2x) dx 7) ç(3)/((1-x^2)^1/2) dx I picked the antiderivatives i did not know how to do. Please show me how to do a couple of t...

16 years ago

In the titration of 50.0 mL of 1.0 M CH3NH2 (kb=4.4 x 10^-4), with 0.50 M HCl, calculate the pH a) after 50.0 mL of 0.50 M has been added b) at the stoichiometric point.

16 years ago

Let R be the first quadrant region enclosed by the graph of y= 2e^-x and the line x=k. a) Find the area of R in terms of k. b) Find the volume of the solid generated when R is rotated about the x-axis in terms of k. c) What is the volume in part (b) as k...

16 years ago

The position of a particle moving on the x-axis at time t>0 seconds is: x(t)= e^t - t^1/2. a) Find the average velocity of the particel over the interval [1,3]. b) In what direction and how fast is the particle moving at t= 1 seconds? c) For what values o...

16 years ago

What is ksp for lithium carbonate? I got an answer of 2.40 x 10^-4 but i need to check that answer with somebody who can work this out

16 years ago

It is found that 24.68 mL of 0.1165 M NaOH is needed to titrate 0.2931 g of an unknown acid to the penolphtalein end point. Calculate the equivilent mass of the acid.

16 years ago

A conical tank sits point down, at ground level, so that the circular top of the tank is parallel to the ground. The tank is 5.0 meters tall, and the top of the tank has a diameter of 3.0 meters. The tank is half full of water. What is the water level (de...

16 years ago

The sum of the measures of angle A and angle Y is 90. If the measure of angle X is 30 less than twice the measure of angle Y, what is the measure of angle X? a) 20 degrees b) 35 degrees c) 50 degrees d) 65 degrees Is it d? Thank you!

9 years ago

8. Simplify. x+7/x^2+4x-21 A. 1/x-3 B. x-3 C. 1/x-7 D. x-7 I went with A. Am I correct if not help me please?

9 years ago

what is Rb2SO3? like the compund name?

17 years ago

yes. the numbers are exactly the same value.

16 years ago

Al(NO3)3•9H2O BaCl2•2H2O CaCO3 CuSO4•5H2O NaCl BaSO4 Ni(NO3)2•6H2O Use the results of the following observations or laboratory tests to explain how each compound in the table may be eliminated or confirmed. The tests are done in sequence from a) through e...

16 years ago

i don't know why it wont copy/pate. can u help me in the other chemistry question i posted?

16 years ago

the weird symbols in front are supposed be integral signs but watever. i got number 1 and i have the rest i need someone to check the rest. 2)(1/2x^2)/(-4x) 3)-cosx 4)5secx + c 5)0 6)e^x - x^2 7) 3sinx

16 years ago

for the ICE chart, does it need to be in moles or molarity?

16 years ago

the question says: the solubility of Li2CO3 is 7.4 x 10^-2 mol/L, find ksp. I also couldn't find it on any of my talbes but it seems like its a doable question

16 years ago

I thought it couldn't just be squared because we have an uneven ratio (2:3)

16 years ago

in connections too. are these answers at the top right? really need these to be right!

12 years ago

Okay thank you!

9 years ago

Wait I have one more question that I don't get

9 years ago

its BA BA

8 years ago

Jeez. I've seen my LITTLE brother who is 7yo and he has better spelling and grammar than some of you. That's just pretty sad to verify that he does. But yes, the answer is almanac. ₲Ɇ₮ ฿Ɇ₮₮ɆⱤ ₲Ɽ₳₥₥₳Ɽ

5 years ago

Click on my user, I bet you won't understand ANY of what is put up. But go ahead, I bet most people would chicken out. c:

5 years ago

Your answers were wrong

5 years ago

i don’t know WHAT is going on here, but i’m guessing you’re all connexus students?? i just came here for help, and this is what i see lol

4 years ago