Questions and answers by

~christina~

Questions (167)

How would you make 300ml of a mixture of toluene and hexane in a ratio of 70:30 respectively?~I really don't know how I would do
1. 3 answers
2. 572 views
A ball was hit over a netVy= 0 Soy= 2.37m g= -9.8 Vox= 34.42m/s t= 2.137 Sx= 23.92m I know the equations used are Sx=
1. 2 answers
2. 540 views
how would I draw this compound?2-bromo-6-chloro-4,4-dimethylheptane I've tried it again and again but I can't seem to get
1. 3 answers
2. 631 views
2 crates shown in the figure below are on a horizontal frictionless surface. The woman is wearing golf shoes for traction as she
1. 2 answers
2. 1,289 views
(a) Express the vectors A, B, and C in the figure below in terms of unit vectors.(b) Use unit vector notation to find the
1. 3 answers
2. 2,153 views
Concerning TLC plates...1. why should't I allow the solvent to reach the top of the plate? (I assume it's the same as using
1. 2 answers
2. 904 views
I had to do a fractional distillation while my lab partner did a simple distillation. I had 2 unknown compounds which could have
1. 0 answers
2. 552 views
Kathy has a sports car that can accelerate at the rate of 4.90m/s^2. She races with Stan. Both cars start from rest but
1. 3 answers
2. 2,332 views
Speedy Sue during is driving at 30.0m/sand enters a 1 lane tunnel. She then observes a slow moving van 155m ahead traveling at
1. 2 answers
2. 2,196 views
Can the Kinematic equations be used if the acceleration is = to zero?~I know that they can only be used if the acceleration is
1. 2 answers
2. 507 views
2 cars are moving in same direction in parallel lanes along a highway. At some instant velocity of car A exceeds car A exceeds
1. 5 answers
2. 1,216 views
Calculate the weight of water that can be removed from a wet organic phase using 50.0g of magnesium sulfate. Assume that it
1. 0 answers
2. 823 views
what would the maximum slope possible for a v vs t graph of acar released from rest on an air track elevated at one end?~I know
1. 2 answers
2. 848 views
which compound has the higher boiling point??1) \/o\ 2) \/\OH a)The compound has a larger dipole moment,
1. 2 answers
2. 698 views
~it was bumped over to the next page so I recopied it and added my answer for the question and was wondering if my integration
1. 6 answers
2. 548 views
A creature moves at a speed of 5.00 furlongs per fortnight (not a very common unit of speed). Given that 1 furlong= 220 yards
1. 2 answers
2. 2,838 views
A rod extending between x=0 and x= 14.0cm has a uniform cross-sectional area A= 9.00cm^2. It is made from a continuously
1. 6 answers
2. 2,821 views
In a parking lot, the # of ordinary cars is larger than the # of sports utility vehicles. by 94.7%. The difference btwn the # of
1. 5 answers
2. 889 views
At the time of this books printing the national debt is about $8 trillion.(a) If payments were made at the rate of $1000 per
1. 1 answer
2. 539 views
A major motor company displays a die-cast model of its first automobile, made from 9.35kg of iron. To celebrate its one-hundreth
1. 3 answers
2. 3,718 views
The periods of oscillaton were measured down to 0.38s. How could this be done with common laboratory timers?-a given hint is :
1. 4 answers
2. 1,404 views
Lab..again0.050g benzoic acid/succinic acid/sodium benzoate. -choose 1 and put 0.050g of that compound into 5ml conical vial
1. 2 answers
2. 1,306 views
I guess nobody will help me with what "part water" means??If you want clarifying on that is it for example say 1g compound and
1. 6 answers
2. 574 views
This pertains to the Merck Index.I would have to say that the exact solubility is not very clear like for ex. Sodium
1. 3 answers
2. 623 views
I'm not sure how to reference the source if I used the Merck Index.It's the 14th edition and it has the editors and publisher
1. 2 answers
2. 653 views
This pertains to using a pasteur pipette.I have this weird problem when I use a pasteur pipette. I go and draw the liquid into
1. 7 answers
2. 950 views
What would the best way to determine the organic layer from the aqueous layer in a extraction procedure?~would it be to add a
1. 14 answers
2. 2,490 views
what is a distribution coefficent?
1. 1 answer
2. 316 views
Aiieeee!Todays lab...good grief. I was supposed to dissolve 0.3g of impure sulfanilamide in enough ethyl alchohol (95%) and me
1. 6 answers
2. 727 views
1.) When determining the melting point it's described in my text as recording 2 points in the melting process.a) when the
1. 2 answers
2. 1,050 views
~From before since the question's been bumped to the next page. Just copied and paste with added stuff.I'm confused as to what
1. 12 answers
2. 994 views
I just read my syllabus for lab and I am kind of shocked at what it says.I do know that I have to write out procedures of the
1. 4 answers
2. 983 views
I'm confused as to what to do for the calculations for my lab.Lab: Semimicroscale crystalization-erylenmyeyerflask and Hirsch
1. 4 answers
2. 1,271 views
If these compounds are shaken in a test tube for 10-20 sec will they form a miscible (1 layer) or immisible (form 2 layers)?a)
1. 5 answers
2. 563 views
Solubility:Solubility of compounds in a)water (highly polar) b)methyl alchohol (intermediate polarity) c)Hexane (nonpolar) My
1. 4 answers
2. 1,583 views
A few questions.1. What is the difference btwn crystalization and precipitation? 2. What will happen if you choose a solvent
1. 4 answers
2. 662 views
statement from my text says:"like disolves like", This rule is most commonly applied to polar and nonpolar compounds. According
1. 4 answers
2. 1,200 views
Indicate the correct waste container for the following compoundschoices are halogenated organic, nonhalogenated organic,
1. 3 answers
2. 624 views
82.453 in 3 significant figures with scientific notation.~hm..I don't know how to do this...it sounds simple but I'm confused.
1. 2 answers
2. 1,403 views
How would I go and express these numbers with 3 significant figures in normal notation?a)15.08 b)1444 c)83,909 d)0.524 e)0.0254
1. 5 answers
2. 3,105 views
Q: How could the function y=3t^2 +4 be plotted on a cartesian graph to produce a straight line? What would be the numerical
1. 5 answers
2. 6,164 views
Do experimental measurements give the true value of a physical quantity?explain. ~I say no it doesn't. But why that is is up to
1. 8 answers
2. 4,218 views
CH3CHClCH2Cl vs. CH2ClCHClCH3How would I know if : -The two formulas represent
1. 6 answers
2. 1,308 views
I have a problem drawing this formula.CH3CH2CH2CH(CH3)CCCH3 The problem is the 2 c's next to each other. I don't know
1. 5 answers
2. 806 views
how would I determine the hybridization of the carbon atom if it has 3 single bonds with hydrogen and no free electrons?Do I
1. 2 answers
2. 512 views
now there's nothing here...
1. 5 answers
2. 290 views
For that question by Josh on the second page I reviewed what you did and am confused to how you found the g excess reagent (NH3)
1. 3 answers
2. 1,216 views
I was curious to know whether it was standardized practice to have labs for chemistry classes in highschool.I personally have
1. 12 answers
2. 1,245 views
Is it just my computer or something is funny with the Jiskha page where only the last answers are shown on the page. Does anyone
1. 2 answers
2. 560 views
Why would a potato cook faster if you poke holes in it with a fork before microwaving it?~My thinking is that it would increase
1. 0 answers
2. 725 views
It wasn't answered before and I hope I don't get reprimanded for asking again...(those sites didn't help)Are bodies fully
1. 0 answers
2. 554 views
I forgot about this but now remember what I wanted to ask about. I read in a newspaper that a local girl had drank 7 cups of
1. 0 answers
2. 748 views
I was curious about formaldehyde after reading somewhere online where this man went and drank a beer which was apparently
1. 0 answers
2. 544 views
This question relates to what someone posted below...It was explained to them that a reducing agent is oxidized when it reduces?
1. 0 answers
2. 741 views
How can someone's blood literally boil when they go into a plane at too high an altitude?They said it was called the bends on
1. 0 answers
2. 650 views
I have a odd question once again.(I'm not creating a report on this) Plastic/ foam in the microwave... I have actually done this
1. 0 answers
2. 528 views
sorry for repost~C
1. 0 answers
2. 317 views
I have a question as to how to separate my own opinion from what I have reasearched.I seems that I have a actually blend this
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2. 955 views
From what was commented on my report on tooth bleaching hazards, I was curious to know what exactly everyone thought about it. I
1. 3 answers
2. 558 views
From what was commented on my report on tooth bleaching hazards, I was curious to know what exactly everyone thought about it. I
1. 0 answers
2. 572 views
Just as I promised, here is my reasearch result on bleaching safety. It took me a whole week to compile the information, go to
1. 0 answers
2. 519 views
In lab...last one ...where I had to go and heat these brass cartileges (I really don't think that's spelled correctly) and the
1. 0 answers
2. 447 views
There are many tooth whitening products on the market from what I've seen. And also available in treatments from the dentist as
1. 1 answer
2. 573 views
Potassium Carbonate + Sodium Bicarbonate...toxic or not? Saw a actual bottle of this stuff in the supermarket...label says oddly
1. 0 answers
2. 492 views
A car goes from a dead stop to 25m/s in 5s going east. It keeps going then slows down after it reaches 60m/s. It is being drived
1. 0 answers
2. 456 views
Imagine a particle of dust that masses 25.48ug. What is it's mass in atomic mass units? Round off to appropriate # of
1. 0 answers
2. 710 views
I'm totally confused with this topic..not sure if it's science or whatnot..Pyrite/ fool's gold yep then comes the weirdness...I
1. 0 answers
2. 662 views