Questions and answers by

lyne

Questions (127)

i already asked this question for how to divide(x^2 +2x) / 2x-1 i need to find the quoyient not how to simplify it. I need to
1. 2 answers
2. 435 views
how would i do(x^2 + 2x) / (2x-1) thanks
1. 2 answers
2. 321 views
okay i need to find the domain and range of thisz(x) = �ãx^2 - 100 (everything is in the square root) so i think i found the
1. 1 answer
2. 1,140 views
how large are bacteria?what are the requirements for autoclaving bacteria
1. 0 answers
2. 365 views
what would the graph of this look likexy<0
1. 1 answer
2. 535 views
what is the common-source outbreak of the H1N1 flu of 2009
1. 0 answers
2. 400 views
Where and what is patient zero in the H1N1 infection? Use this info to discuss primary infections vs. secondary infectionsi can
1. 1 answer
2. 492 views
ok this is kinda stupid but i totally just confused myself with the simplest thing hahaokay when doing the FOIL methed to this
1. 2 answers
2. 507 views
are most petri dishes the same size?if so what would the diameter of one be? i need to find the surface area of a petri dish
1. 3 answers
2. 515 views
are most petri dishes the same size?if so what would the diameter of one be? i need to find the surface area of a petri dish
1. 2 answers
2. 553 views
im solving nonlinear equationsthey are y = x^2 y - 2 = x so i plugged in the x^2 to get x^2 - x = 2 then i factored out an x to
1. 3 answers
2. 399 views
When using a light microscope to look att two hairs crossed over each other...Under low power were both hairs in focus at the
1. 1 answer
2. 685 views
what is the best resolution of our light microscopesthe formula should be RP = wavelength/2NA right?? so my question is which
1. 1 answer
2. 497 views
List 6 uses of microbes both by humans and in mother nature
1. 0 answers
2. 474 views
mole can be abreviated as mol right??
1. 1 answer
2. 356 views
if you were to react 14.00 grams of salicylic acid with 8.50 grams of acetic anhydride, what would your theoretical yield be?the
1. 1 answer
2. 509 views
what VSEPR "shapes" and bond angles do you find Toluene
1. 2 answers
2. 1,055 views
how many grams of a precipitate will form when you mix 45 ml of a 3.5M silver nitrate solution with 45 ml of a 5.4 M magnesium
1. 2 answers
2. 817 views
what atoms usually form coordinate covalent bondsi couldn't find this anywhere also i just want to make sure is the
1. 1 answer
2. 659 views
how many atoms of tungsten are in 504.56 g of tungsten(IV)acetate.i attempted this problem but ended up with atoms of
1. 1 answer
2. 1,048 views
list three ions that are iso-electric with potassium +1please explain i have no clue
1. 1 answer
2. 439 views
what ionic compounds could you form from the following?Sodium Calcium Neon Phosphorus Chlorine i have NaCl, CaCl2, Na3P, and
1. 1 answer
2. 612 views
my last question is how do you determine the molecular formula of a covalent compound given its formula?
1. 1 answer
2. 426 views
my teacher told me that polar bonds have a difference in elecronegativities of .4-2.1is that the only way to find if a bond is
1. 1 answer
2. 556 views
what are structural formulas??also is this correct hybridization is the setting aside of p orbitals in order to form bonds (pi
1. 4 answers
2. 547 views
how would you determine the % of ionic/covalent char. in the bond?this is on my test review and don't remember learning it
1. 2 answers
2. 451 views
I have to write an essay on the role Germany had in World War 1 between 1914 and 1920.I need to have three key points but I can
1. 3 answers
2. 596 views
I have to draw the QMM of CL2C2. For the Lewis structure i think that the two C atoms form a triple bond and the Cl atoms form
1. 2 answers
2. 789 views
help with below questions please and thank you
1. 2 answers
2. 387 views
why is COCl2 polara. different electronegativities b. nonsymmetric c. tetrahedral d. symmetric e. trigonal planar more than one
1. 1 answer
2. 1,609 views
I have to draw the QMM of CL2C2. For the Lewis structure i think that the two C ayoms form a triple bond and the Cl atoms form
1. 1 answer
2. 633 views
How do multiple bonds introduce rigidity into molecules?what is meant by rigidity??
1. 1 answer
2. 949 views
what is the duet rule?
1. 1 answer
2. 426 views
when do you need to use the octet rule for lewis structures and when does it not applyi am confused for N2O4 i cant get the
1. 3 answers
2. 876 views
hpw would i draw a lewis structure for a molecule with 3.5 bondsfor example NO2???
1. 1 answer
2. 619 views
Why are all diatomic molecules diatomic molecules linear, regardless of the number of valence electron pairs on the atom?i don't
1. 1 answer
2. 966 views
okay we are drawing bonds and i was wondering how i am supposed to know if you can make a double or triple bondfor example for
1. 6 answers
2. 621 views
Define variables and write a system of equations for each situation. Solve using substitution.Suppose you are thinking about
1. 4 answers
2. 1,524 views
Give two reasons for the new interest in leisure activities in the 1920s.i already know one: rising wages and labor-saving
1. 2 answers
2. 532 views
what's one good and bad effect of Prohibition?
1. 3 answers
2. 450 views
what does the geologic time scale indicate about the change in life-forms over time?
1. 2 answers
2. 789 views
how did geologists determine the divisions of the geologic time scale?
1. 1 answer
2. 686 views
The total acidity in water samples can be determined by neutralization with standard sodium hydroxide solution. What is the
1. 1 answer
2. 1,926 views
Most window cleaners are aqueous solutions of ammonia. A 9.00 mL sample of a particular window cleaner requires 42.95 mL of
1. 3 answers
2. 776 views
NH3 + HCl -->can someone please finish that?? is it 2H2 + N2 + Cl or something? if so how would i balance it?
1. 1 answer
2. 423 views
Calculate the hydrogen ion concentration, in moles per liter, for solutions with each of the following pH values.pH=1.10 im
1. 2 answers
2. 2,214 views
Calculate the hydrogen ion concentration and the pH of each of the following solutions of strong acids.(a) 0.00010 M HCl if you
1. 1 answer
2. 1,348 views
help below please
1. 1 answer
2. 282 views
Write a chemical equation showing how each of the following species behaves as a base when dissolved in watera.) O2- i have O2-
1. 1 answer
2. 1,518 views
does normality measure concentration of solutions??
1. 1 answer
2. 343 views
for my test i have to be able toBe able to determine the final molarity of a mixture of two solutions my teacher said the
1. 2 answers
2. 438 views
what are the different types of solutions??is it saturated nonsaturated and supersaturated?
1. 1 answer
2. 370 views
how many moles of hydroxide ions are there in 82.35 mL of a 2.164M Sr(OH)2 solution?i understand how to do the math for problems
1. 1 answer
2. 834 views
Calculate the sodium ion concentration when 80.0 mL of 4.5 M sodium carbonate is added to 30.0 mL of 1.0 M sodium bicarbonate.ho
1. 1 answer
2. 660 views
What volume of .101 M HNO3 is required to neutralize each of the following solutions?there are four and i got them all right but
1. 3 answers
2. 1,662 views
If the volume of solute is 6 ml and the volume of the solution is 300 ml, what is the solute's percent by volume?is it
1. 1 answer
2. 1,100 views
How much water should be added to 45.0 mL of 0.225 M HCl to dilute the solution to 0.155 M?i did .225M x .045L / .155M = 65mL so
1. 1 answer
2. 470 views
How much of each starting material would you use to prepare 2.00 L of each of the following solutions?0.240 M NaOH from 1.00 M
1. 1 answer
2. 1,921 views
What is the molarity of a solution when 3L of a 4M solution is mixed with 3L of a 6M solution?
1. 2 answers
2. 459 views
How would you prepare 250.0 ml of a 0.6 M aluminum sulfate solution
1. 1 answer
2. 1,037 views
How much water should be added to 55.0 mL of 0.201 M HCl to dilute the solution to 0.155 M?i used M1V1 = M2V2 and i got 71.3mL
1. 2 answers
2. 495 views
how do you prepare a solution using the proper lab equipment(both from dry solid and a stock solution)i researched it but all i
1. 2 answers
2. 786 views
we have to make an instrctinal packet showin relationships between moles and concentration.i cant find the following 1)how is
1. 6 answers
2. 580 views
is cm^3 and cc and mL all the same??
1. 1 answer
2. 278 views
we did a lab where we mixed an iron nail with cupric chloride to find the reactionis this the balanced equation... Fe + CuCl2
1. 1 answer
2. 737 views
Solutions that have large amounts of solute are___solutions that have small amounts of solute are ___
1. 1 answer
2. 571 views
A student prepared aspirin (C9H8O4) in a laboratory experiment using the following reaction.C7H6O3 + C4H6O3 C9H8O4 + HC2H3O2 The
1. 3 answers
2. 2,875 views
Consider the following unbalanced reaction.P4(s) + 6F2(g) 4PF3(g) How many grams of F2 are needed to produce 114. g of PF3 if
1. 1 answer
2. 2,190 views
function rule for tispoints- 1 2 3 4 lines- 0 1 3 6 its similar to an earlir one i posted but i still don't quite understand
1. 3 answers
2. 520 views
Chlorine dioxide, ClO2, has been used as a disinfectant in air conditioning systems. It reacts with water according to the
1. 4 answers
2. 2,218 views
what is the function rule for this figuresides- 3 4 5 6 7 diagonals- 0 2 5 9 15
1. 1 answer
2. 419 views
Hydrogen cyanide is produced industrially from the reaction of gaseous ammonia, oxygen, and methane.2 NH3(g) + 3 O2(g) + 2
1. 2 answers
2. 3,871 views
#2) Consider the preciditation reaction of a solution containing 3.50 grams of sodium phosphate mixed with a solution containing
1. 1 answer
2. 1,058 views
a.Write the balanced chemical equation for the reaction of methane and sulfur. (Type your answer using the format CO2 for CO2.
1. 6 answers
2. 2,614 views
im having trouble balancing this. I tried it but everything just ends up being unevenBa(OH)2 * 8H2O + NH4SCN --> Ba(SCN)2 + H2O
1. 2 answers
2. 446 views
When ammonia gas is burned in oxygen the products formed are water and nitrogen monoxide gas. Write the balanced equation
1. 2 answers
2. 851 views
Aspirin (C9H8O4) is synthesized by reacting salicylic acid (C7H6O3) with acetic anhydride (C4H6O3). The balanced equation is
1. 5 answers
2. 1,582 views
is dr bob on
1. 2 answers
2. 339 views
Nitrogen (N2) and hydrogen (H2) react to form ammonia (NH3). Consider a mixture of six nitrogen molecules and six hydrogen
1. 4 answers
2. 12,192 views
can anyone tell me if natalie is on
1. 1 answer
2. 404 views
How many grams of oxygen are required to react with 2.50 g of propane (C3H8) to form CARBON MONOXIDE and water?this is what i
1. 3 answers
2. 2,198 views
Ca + Br2 --> CaBr2its synthesis and the reason the reaction happens is stable electron configuration but i don't understand why.
1. 4 answers
2. 1,896 views
is there any way to tell if a teacher is currently 'on' and answering other question
1. 3 answers
2. 422 views
Ca + Br2 --> CaBr2its synthesis and the reason the reaction happens is stable electron configuration but i don't understand why.
1. 2 answers
2. 619 views
3BaCl + 2Na3PO4 --> Ba3(Po4)2 +^NaClis Ba3(PO4)2 the ppt. because Cl salts are soluble so it will dissolve?
1. 2 answers
2. 751 views
i did a lab and found that of the products two gases were formedH2 and H2CO3 the question is... What are the tests that will
1. 2 answers
2. 461 views
Ca(s) + Br2(l) --> CaBr2 is synthesismy teacher also said that the cause of the reaction is stable electron configuration is
1. 2 answers
2. 3,801 views
NaCl + CuSO4to write the product would i just do double replacement to get Na2SO4 + CuCl2 so the whole thing would be 2NaCl +
1. 5 answers
2. 720 views
predict the identity of the precipitate that forms.calcium nitrate, Ca(NO3)2, and sodium chloride , NaCl why does the answer
1. 1 answer
2. 1,653 views
What does it mean to say that the ions of an electrolyte behave independently of one another when the electrolyte is dissolved
1. 1 answer
2. 678 views
1/2|6y-9| +5 is < or = 2i solved it and got two fractions but the answer is 0 can anyone explain? btw this is absolute value
1. 3 answers
2. 473 views
The term Intrinsic denotes a characteristic or property of some thing or action which is essential and specific to that thing or
1. 2 answers
2. 648 views
sorry for all the questions i have an exam tomoro!but what is intrinsic or intensive are they the same?
1. 1 answer
2. 456 views
arent the allotropes of carbondiamond buckminsterfullerene(or whatever its called haha) and graphite?
1. 2 answers
2. 611 views
are these correct when solving for proper significant figures2.33 + 4.0045=6.33 .000456 + 1.0023=1.0027 2.33/4.0045=.582
1. 1 answer
2. 534 views
how many mL in .00670 grams of a substance that has a density of 1.96 g/cm3.do you do 1.96g/cm3 divided by .00670 grams to solve
1. 0 answers
2. 485 views
continued from before....the question was what are three chemical characteristics and ten physical characteristics so then would
1. 3 answers
2. 658 views
okay and i don't understand what they are asking for for chemical characteristics.i was thinking like density, melting point,
1. 1 answer
2. 502 views
need help on chemistry below
1. 1 answer
2. 376 views
how many protons, nnutrons, atomic mass, mass number, and charge to each of the following have?sodium atom fluorine ion stannic
1. 5 answers
2. 729 views