natash

what is the locomotory organelle for Dictyostelida?

18 years ago

I neeeeeeeeeed helppp pronto, Measurements show that a honeybee in active flight can acquire an electrostatic charge as great as 93.0 pC a. how many electrons must be transferred to produce this charge? b.suppose 2 bees, each with a charge of 93.0pC, are...

18 years ago

what is the magnitude of the electric field produced by a charge of magnitude 6.00 micro coulombs at a distance of a. 1.00m b. 2.00m

18 years ago

a point charge q=5.0 micro coulombs is placed at each corner of an equilateral triangle with sides .26 m in length. a. what is the magnitude of the electric field at the midpoint of any of the three sides of the triangle?

18 years ago

write a balanced equation for the reaction that occurs when an aquesous solution of iron(II) chloride is mixed with an aqueous solution of potassium hydroxide

17 years ago

set C: AgNO3(aq), Ba(NO3)2 (aq), HCI(aq), H2SO4(aq), NaOH(aq) what preliminary test results are you looking for to identify conclusively your unknown solutions as set C? Explain.

17 years ago

when an aqueous solution suspected of containing BA2+ or Pb2+ or both is mixed with sulfuric acid a precipitate forms. In another test, when the original solution is mixed with an aqueous solution of sodium sulfide no precipitate forms. What do these two...

17 years ago

If the warm water in this experiment (Im not quite sure if you need more information) is at 98C, how much heat must be relesed in order for the temperature of 100. mL of water to decrease to 32C ?

17 years ago

If a 5.26-g sample of copper at 258C is placed in 125mL of water at 21.0C, how hot will the water get? Assume no heat loss to the surroundings. The specific heat of copper is .385 J/g C

17 years ago

what approach do you suggest using to prevent your water sample from cooling off beore you start your measurements?

17 years ago

If 20.0mL of .2019M HCI requires 39.63mL of a NaOH solution for complete neutralization, what is the concentration of the NaOH solution? how many significant figures are justified in the answer?

17 years ago

write the net ionic equation for the unknown titration reaction in this experiment. KHC8H4O4(aq) + NaOH(aq)----> KNaC8H4O4 + H2O(l)

17 years ago

when setting up their experiment, a student discovered that the solution in their flask turned bright pink upon adding 2 drops of the indicator, even before beginning the titration. what do you suspect was the mistake that the student made?

17 years ago

In what ways would you expect a fetus to differ from an animal some time after birth?

17 years ago

why are the atomic emission line spectra different for each element?

17 years ago

what colored lines are expected in the atomic emission spectrum for mercury?

17 years ago

Briefly explain why the transitions associated with the Lyman series correspond to wavelengths in the ultraviolet region of the electromagnetic spectrum.

17 years ago

Acetic acid (HC2H3O2) is an important component of vinegar. A 10.00mL sample of vinegar is titrated with .5052 M NaOH, and 16.88 mL are required to neutralize the acetic acid that is present. a.write a balanced equation for this neutralization reaction b....

17 years ago

How many mL of stomach acid (assume it is .035 M HCI) can be neutralized by an antacid tablet containing .231g Mg(OH)2?

17 years ago

For each of the following circumstances, indicate whether the calculated molarity of NaOH would be lower, higher or unaffected. Explain your answer in each case. a.the inside of the pipet used to transfer the standard HCI solution was wet with water. b.Yo...

17 years ago

what is it important to keep the NaOH solution covered at all times? How will the molarity of the NaOH solution be affected by its continued exposure to the atmosphere? The pale pink color of the titration solution at the end point will fade to colorless...

17 years ago

In the trigonal bipyramidal geometry, which position- axial or equatorial- do nonbonding electrons prefer? why? I know its equatorial but I'm not exactly sure why

17 years ago

1. under what circumstances is the molecular geometry around a single central atom the same as the electron group geometry around the central atom? 2.If all of the electron groups around a single central atom are bonding, and the same outer atom is bonded...

17 years ago

ok I'm having trouble with graphing this chemistry lab. It's on atomic emission spectra. In this experiment we observed the line spectrum of first helium, and here is the data: color: distance: wavelenght: violet 20.35cm light blue 21.70cm green 23.08cm l...

17 years ago

which molecule or compound below contains a polar covalent bond? why? C2H4 LiI NCL3 ZnS AgCl

17 years ago

use the data given below to construct a Born-Haber cycle to determine the lattice energy of CaO Ca(s)--->Ca(g) 193 Ca(g)--->Ca+(g) + e- 590 Ca+(g)--->Ca2+(g) +e- 1010 2O(g)---->02(g) -498 O(g) +e--->0-(g) -141 O-(g) + e---->O2-(g) 878 Ca(s) +1/2 O2(g)--->...

17 years ago

draw the lewis structure for NO2- including any valid resonance structures. which of the following statements are true? a. the nitrite ion contains 2 N-O bonds that are equivalent to 1 1/2 bonds. b. the nitrite ion contains 2 N=O double bonds c. the nitri...

17 years ago

choose the compound below that contains at least one polar covalent bond, but is nonpolar a. ICl3 b SeBr4 c. CF4 d. HCN Im stuck between C and D C is a tetrahedral which has no net dipole so is non polar, and D is linear which also makes it non polar.

17 years ago

Is dimethyl ether a polar molecule? between dimethyl ether and ethyl alcohol, which molecule is expected to be more soluble in water? explain.

17 years ago

what kind of e-pair geometry, molecular geometry, and bond angles does C4H10 exhibit? I'm confused.

17 years ago

what are the 3 isomers of C2H2Cl2 what are 2 isomers of C2H3Br3, are any other isomers possible? explain.

17 years ago

My lab is on Comparison of the B-carotene content of raw and cooked carrots...if you use a single 5.0g piece of carrot, do you expect to extract more or less B-carotene than with the finely cut carrot sample? explain.

17 years ago

How many isomers of C2H3Br3 are possible? explain.

17 years ago

A 4.55L sample of water contains .115g of sodium ions. Determine the concentration of sodium ions in ppm if the density of the solutions is 1.00g/mL. Ok so ppm=mass of solute/mass of solution *10^-6 so we have the mass of the solute .115g and for the solu...

17 years ago

HOw much energy is required to heat 36.0g H2O from a liquid at 65C to a gas at 115C? The following physical data may be uselful. Hvap=40.7kJ/mol C liquid=4.18 C gas=2.01 C solid= 2.09 T melting=0 C T boiling=100 C The answers about 87.7 kJ However I'm not...

17 years ago

which of the following substances should have the highest melting point? Xe F2 SrS MgO CO2 the answers D, is it because its an ionic compound?

17 years ago

In the reaction of calcium metal and water, 50.0 mL of hydrogen gas is collected over water at 25.0 degrees C with a total pressure of 752 mmHg. Calcualte the number of moles of hydrogen gas that was produced. Do we just plug this into n=pv/rt ? or is the...

17 years ago

Calculate the mole fraction of total ions in an aqueous solution prepared by dissolving .400 moles of MgCl2 in 850.0g of water. mole fraction =amount solute(in mols) /total amount of solute and solvent (in mols) so wouldn't it be .400/ .400+ 47.2 which is...

17 years ago

determine the vapor pressure of a solution at 55 degrees C that contains 34.2g NaCl in 375 mL of water. The vapor pressure of pure water at 55 degrees C is 118.1 torr. so Psolution=XsolventPsolvent I don't know why I'm not getting the correct answer... so...

17 years ago

If a mutation would be beneficial, is it more likely to occur? a)Yes, because it helps the species survive b)No

17 years ago

if a mutation would be beneficial, is it more likely to occur? a. yes, bec. it helps the species survive b. No the answer is B, however I'm not sure why. wouldn't a mutation that is beneficial be more likely to occur for the sake of the species ?

17 years ago

following a drought on Daphne Major, the beaks of the offspring of the surviving medium ground finches (average 14mm) were larger than the beaks of the entire population prior to the drought ( 12mm average). Based on the prior study, it is known that the...

17 years ago

Rank the size of a change in temperature of one degree fahrenheit, one degree celsius, and one kelvin. Ok I can't seem to get this question right no matter what I do. Isn't one fahrenheit degree the largest then celsius and kelvin? There are 180 fahrenhei...

17 years ago

Na is a metal O, Si, Kr, B are nonmetals Mn is a semimetal why am i getting this wrong ?

17 years ago

If tan(x)=8/3 and sin(x)<0, then find cos (x) sec(x) csc(x) i don't understand how u do this problem

17 years ago

the scientific method is only concerned with experimentation True or False

17 years ago

The American Dental Association recommends that an adult female should consume 3.0mg of flouride per day to prevent tooth decay. If the flouride is consumed as sodium flouride (45.24% F)what amount of sodium flouride contains the recommended amount of flo...

17 years ago

I want to know why indium and oxygen form In2O3, where does the 3 come from ?

17 years ago

Sterling silver is a mixture of silver and copper having a mole ration of silver to copper equal to 7.8 what is the mass percent composition of this mixture? Ok I know the answer to this and I know how its done: 1 mol Cu weighs 63.5 g 7.8 mol Ag weigh 7.8...

17 years ago

For the reaction shown, find the limiting reactant for each of the following initial amounts of reactants. 4Al(s)+3O2 (g)-->2Al2O3 (s) 4 mol Al 2.6 mol O2

17 years ago

How many CO2 molecules would be formed from the reaction mixture that produces the greatest amount of products? 2CH3OH(g)+3O2(g)--->2CO2(g)+4H2O(g)

17 years ago

How many CO2 molecules would be formed from the reaction mixture that produces the greatest amount of products? 2CH3OH(g)+3O2(g)--->2CO2(g)+4H2O(g)

17 years ago

Find the percent by mass of sodium chloride in a 1.15M NaCl solution. The density of the solution is 1.07g/mL.

17 years ago

Glial cells normally lose their mitotic ability prior to birth True or False Which of the following is NOT a function of astrocytes? a. can take up NT from a synapse b.can stimulate or inhibit neurons c.needed to form synapses in the CNS d.Phagocytose for...

17 years ago

during the absolute refractory period a supramaximal stimulus can bring the cell to threshold true or false

17 years ago

A 25.0 g aluminum block is warmed to 65.2 C and plunged into an insulated beaker containing 55.3g of water initially at 22.0C. the aluminum and water are allowed to come to thermal equilibrium. Assuming that no heat is lost, what is the final temperature...

17 years ago

consider the following thermochemical equation for the combustion of acetone C3H6O(l)+4O2(g)---->3CO2(g)+3H2O(g) delta H rxn=-1790kJ. If a bottle of nail polish remover contains 179mL of acetone, how much heat would be released by its complete combustion?...

17 years ago

The minimum energy required to change the conformation of 11-cis-retinal within the eye is about 164kJ/mol. Calculate the longest wavelenght visible to the human eye

16 years ago

How much energy is required to ionize a hydrogen atom in its ground (or lowest energy) state? What wavelength of light contains enough energy in a single photon to ionize a hydrogen atom?

16 years ago

in the ground state electron configuration of Fe3+, how many unpaired electrons are present? I thought it was 1, but im getting a wrong answer.

16 years ago

what is the electron configuration for Au+ ? where does f block fit in?

16 years ago

why is the total distance traveled by a mass traveling in a circle of radius R during n revolutions =2piRn. The average speed is the distance traveled divided by the elapsed time, so: v=2piRn/delta T, where delta T is the elapsed time.

16 years ago

a soln. that is .195 M in CH3NH2 and .105 M in CH3NH3Br what is the balanced equation for this ? How do you know ?

16 years ago

i believe its 21/12(b-2), how did you get the 17b?

18 years ago

google it, its all there

18 years ago

I'm a bit confused so is this the right way to set up the problem heat lost by Cu+heat gained by water=0 5.26g(.385)(Tf-258C)+125g(4.18)(Tf-21C)=0 then you solve for Tf?

17 years ago

I'm using nested styrofoam coffee cups

17 years ago

not exactly

17 years ago

ok for part 2 moles of NaOH=L*M .01*.5052=.005052 moles of NaOH then moles of NaOH =moles of HC2H3O2 since 1-1 ratio from equation that makes .005052 moles of HC2H3O2 correct? then M acetic acid=.005052 moles/.01688L which =2.9*10^-1 is that correct? and...

17 years ago

Ohhh, so which one would be lower, higher, or unaffected. Can you pleaseeeeeeeeeeeeee explain

17 years ago

so if the electronegativities are not the same it has a net dipole? Is this only in a linear molecule?

17 years ago

I believe you just add 29+31+33+35+37+39+41+43+45+47+49 which are 11 terms =429

17 years ago

Ohhhh that's right you have to look at each C separately, that's where I got mixed up, thanx.

17 years ago

yes I know can you just write out the structures, for ex. C2H6O , ethanol CH3CH2OH and dimethyl ether CH3OCH3 those are the 2 isomers

17 years ago

I didn't ask you to do my homework, those were specific questions I needed help with. All I needed was the condensed structure.

17 years ago

I'm glad you googled that up ;) Ummm no actually that wouldn't be the answer, it's far from being the answer, it's just a tiny part you need, to come up with the answer. So if you don't know what the question is plz refrain from your remarks of "We don't...

17 years ago

I'm thinking its CH3NH3Br + H2O <====>H3O + CH3NH2 is this correct ?

16 years ago