Recent content by CMATT

Thank you so much! This makes more sense. My book had some description about solubility and pure compounds when recrystallizing, but I just couldn't grasp the concept. Thanks again!

Sorry my chemistry book is confusing! I misread

Homework Statement Why is ethanol a bad choice for recrystallization of phthalic acid? 2. The attempt at a solution I know phthalic acid is very soluble in water, so water is a great candidate to recrystallize phthalic acid. I also know water and ethanol are not miscible. But I don't know how...

Homework Statement Predict the hybridization and geometry of the indicated atom. Answer all parts. Homework Equations CH3CH2 There is a ( - ) sign above the second C Hybridization = ? Geometry = ? The Attempt at a Solution I know I'm supposed to count the groups around the atom, but I'm...

Homework Statement Choose the element in each of the sets you would expect to have the highest IE2. a. K b. Be c. Mg d. Ca e. Al Homework Equations The correct answer is K The Attempt at a Solution I do not understand why it is K ...I kind of guessed by using my Ionization Energy diagram...

100 g Cesium / 51.16 g Cesium = 1.954 85.5 g Cesium / 1.954 = 43.7 g I see it now, thank you for your help

Homework Statement Suppose the element A contains three isotopes, 86A (atomic mass 85.909 u, abundance 16.19%) 87A (atomic mass 86.908, abundance 7.00%) and 88A (atomic mass 87.906 u). What would be the atomic mass of A that would appear in the periodic table? Homework Equations (A1 x %A1) +...

Homework Statement A sample of a compound of cesium (Cs) and iodine (I) contains 51.16g cesium and 48.84 g iodine, how many grams of cesium can be obtained from 85.5g of this compound? The attempt at a solution I don't really know where to begin. What I have tried was the following: 51.16 g +...

Homework Statement Choose each of the following statements that would be true regarding the brain or special senses. There could be multiple answers. a) Properly using the captive bolt should result in pupils that constrict in response to a bright light b) The part of the brain that releases...

201 m ?

Yes, I drew a graph with N/S/E/W directions and lines showing where the cow is relative to the direction. She is traveling east at first, and then changes direction to go north. Both positive directions...but even when I add them and divide I'm still getting it wrong. As for the pythagoras, I'm...

So do I add them together then?

Homework Statement A cow runs in a straight line, moving 108 m east in 16.4 seconds. It then turns and runs 93 m north in 7.64 seconds. a) What was the cow's average speed over the whole trip? b) What was the cow's average velocity over the whole trip? Homework Equations average speed =...

NEVERMIND! I solved it

Homework Statement Ultrasound reflected from an oncoming bloodstream that is moving at 28.7 cm/s is mixed with the original frequency of 2.41 MHz to produce beats. Use the speed of sound in human tissue as 1540 m/s. Assume that the frequency of 2.41 MHz is accurate to seven significant figures...