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natash

Questions (76)

a soln. that is .195 M in CH3NH2 and .105 M in CH3NH3Brwhat is the balanced equation for this ? How do you know ?
1. 2 answers
2. 1,522 views
why is the total distance traveled by a mass traveling in a circle of radius R during n revolutions =2piRn. The average speed is
1. 1 answer
2. 501 views
why is the total distance traveled by a mass traveling in a circle of radius R during n revolutions =2piRn. The average speed is
1. 1 answer
2. 606 views
what is the electron configuration for Au+ ?where does f block fit in?
1. 1 answer
2. 667 views
in the ground state electron configuration of Fe3+, how many unpaired electrons are present? I thought it was 1, but im getting
1. 3 answers
2. 6,671 views
How much energy is required to ionize a hydrogen atom in its ground (or lowest energy) state?What wavelength of light contains
1. 1 answer
2. 1,621 views
The minimum energy required to change the conformation of 11-cis-retinal within the eye is about 164kJ/mol.Calculate the longest
1. 2 answers
2. 951 views
consider the following thermochemical equation for the combustion of acetoneC3H6O(l)+4O2(g)---->3CO2(g)+3H2O(g) delta H
1. 2 answers
2. 1,742 views
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.
1. 3 answers
2. 2,688 views
during the absolute refractory period a supramaximal stimulus can bring the cell to thresholdtrue or false
1. 1 answer
2. 1,221 views
Glial cells normally lose their mitotic ability prior to birthTrue or False Which of the following is NOT a function of
1. 2 answers
2. 701 views
Find the percent by mass of sodium chloride in a 1.15M NaCl solution. The density of the solution is 1.07g/mL.
1. 1 answer
2. 5,976 views
How many CO2 molecules would be formed from the reaction mixture that produces the greatest amount of products?2CH3OH(g)+3O2(g)-
1. 2 answers
2. 1,789 views
How many CO2 molecules would be formed from the reaction mixture that produces the greatest amount of products?2CH3OH(g)+3O2(g)-
1. 1 answer
2. 1,158 views
For the reaction shown, find the limiting reactant for each of the following initial amounts of reactants.4Al(s)+3O2
1. 1 answer
2. 5,097 views
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
1. 1 answer
2. 1,294 views
I want to know why indium and oxygen form In2O3, where does the 3 come from ?
1. 1 answer
2. 413 views
The American Dental Association recommends that an adult female should consume 3.0mg of flouride per day to prevent tooth decay.
1. 2 answers
2. 992 views
the scientific method is only concerned with experimentationTrue or False
1. 1 answer
2. 686 views
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
1. 2 answers
2. 828 views
Na is a metalO, Si, Kr, B are nonmetals Mn is a semimetal why am i getting this wrong ?
1. 1 answer
2. 496 views
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
1. 2 answers
2. 1,703 views
following a drought on Daphne Major, the beaks of the offspring of the surviving medium ground finches (average 14mm) were
1. 1 answer
2. 1,392 views
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,
1. 1 answer
2. 1,041 views
which is more parsimonious?the horse and the zebra are more closely related than either is to the chicken, or the chicken and
1. 0 answers
2. 433 views
If a mutation would be beneficial, is it more likely to occur?a)Yes, because it helps the species survive b)No
1. 1 answer
2. 447 views
1. What are the qualities of H bonds? give some examples of H bonds.2.examples of saturated and unsaturated fats
1. 0 answers
2. 545 views
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
1. 4 answers
2. 5,333 views
Calculate the mole fraction of total ions in an aqueous solution prepared by dissolving .400 moles of MgCl2 in 850.0g of water.m
1. 1 answer
2. 3,967 views
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
1. 1 answer
2. 1,137 views
which of the following substances should have the highest melting point?Xe F2 SrS MgO CO2 the answers D, is it because its an
1. 1 answer
2. 6,002 views
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.
1. 1 answer
2. 3,460 views
A 4.55L sample of water contains .115g of sodium ions. Determine the concentration of sodium ions in ppm if the density of the
1. 1 answer
2. 6,180 views
How many isomers of C2H3Br3 are possible? explain.
1. 12 answers
2. 3,940 views
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
1. 2 answers
2. 577 views
what are the 3 isomers of C2H2Cl2what are 2 isomers of C2H3Br3, are any other isomers possible? explain.
1. 6 answers
2. 1,206 views
what kind of e-pair geometry, molecular geometry, and bond angles does C4H10 exhibit? I'm confused.
1. 3 answers
2. 1,880 views
Is dimethyl ether a polar molecule?between dimethyl ether and ethyl alcohol, which molecule is expected to be more soluble in
1. 3 answers
2. 2,059 views
why do plants of arid environments have fewer smaller vessels than plants of moist environments?
1. 0 answers
2. 664 views
choose the compound below that contains at least one polar covalent bond, but is nonpolara. ICl3 b SeBr4 c. CF4 d. HCN Im stuck
1. 3 answers
2. 10,625 views
draw the lewis structure for NO2- including any valid resonance structures. which of the following statements are true?a. the
1. 1 answer
2. 11,068 views
use the data given below to construct a Born-Haber cycle to determine the lattice energy of CaOCa(s)--->Ca(g) 193
1. 2 answers
2. 3,331 views
which molecule or compound below contains a polar covalent bond? why?C2H4 LiI NCL3 ZnS AgCl
1. 1 answer
2. 5,404 views
I'm doing a lab on helium and hydrogen emission spectra.so I got violet 20.35cm blue/green 21.70cm green 22.75 light green 23.08
1. 0 answers
2. 557 views
ok I'm having trouble with graphing this chemistry lab. It's on atomic emission spectra. In this experiment we observed the line
1. 1 answer
2. 886 views
1. under what circumstances is the molecular geometry around a single central atom the same as the electron group geometry
1. 1 answer
2. 3,613 views
In the trigonal bipyramidal geometry, which position- axial or equatorial- do nonbonding electrons prefer? why?I know its
1. 2 answers
2. 3,012 views
what is it important to keep the NaOH solution covered at all times?How will the molarity of the NaOH solution be affected by
1. 1 answer
2. 1,524 views
For each of the following circumstances, indicate whether the calculated molarity of NaOH would be lower, higher or unaffected.
1. 3 answers
2. 4,123 views
How many mL of stomach acid (assume it is .035 M HCI) can be neutralized by an antacid tablet containing .231gMg(OH)2?
1. 1 answer
2. 2,963 views
Acetic acid (HC2H3O2) is an important component of vinegar. A 10.00mL sample of vinegar is titrated with .5052 M NaOH, and 16.88
1. 9 answers
2. 4,347 views
Briefly explain why the transitions associated with the Lyman series correspond to wavelengths in the ultraviolet region of the
1. 1 answer
2. 3,338 views
what colored lines are expected in the atomic emission spectrum for mercury?
1. 1 answer
2. 569 views
why are the atomic emission line spectra different for each element?
1. 1 answer
2. 862 views
In what ways would you expect a fetus to differ from an animal some time after birth?
1. 8 answers
2. 545 views
Minerals ener the plant through the soil solution. SOme are passively carried along with the ater that is taken up. Plants can
1. 0 answers
2. 486 views
when setting up their experiment, a student discovered that the solution in their flask turned bright pink upon adding 2 drops
1. 1 answer
2. 1,516 views
write the net ionic equation for the unknown titration reaction in this experiment.KHC8H4O4(aq) + NaOH(aq)----> KNaC8H4O4 +
1. 5 answers
2. 4,155 views
If 20.0mL of .2019M HCI requires 39.63mL of a NaOH solution for complete neutralization, what is the concentration of the NaOH
1. 1 answer
2. 668 views
Lab: claim a pot with pea plants in it. If your pot has more than 3 plants, cut if back to three by cutting the extra plants off
1. 1 answer
2. 513 views
Why do we study pollen tube growth in a lab on hormones?
1. 0 answers
2. 429 views
Lab: claim a pot with pea plants in it. If your pot has more than 3 plants, cut if back to three by cutting the extra plants off
1. 0 answers
2. 533 views
what approach do you suggest using to prevent your water sample from cooling off beore you start your measurements?
1. 3 answers
2. 2,078 views
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
1. 4 answers
2. 3,025 views
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
1. 1 answer
2. 571 views
when an aqueous solution suspected of containing BA2+ or Pb2+ or both is mixed with sulfuric acid a precipitate forms. In
1. 1 answer
2. 1,349 views
set C:AgNO3(aq), Ba(NO3)2 (aq), HCI(aq), H2SO4(aq), NaOH(aq) what preliminary test results are you looking for to identify
1. 2 answers
2. 3,903 views
write a balanced equation for the reaction that occurs when an aquesous solution of iron(II) chloride is mixed with an aqueous
1. 2 answers
2. 1,622 views
Dihybrid crosswhat is the phenotype distribution of each: Dominant green seeds Recessive yellow seeds Dominant purple flowers
1. 0 answers
2. 588 views
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
1. 2 answers
2. 940 views
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.
1. 1 answer
2. 625 views
I neeeeeeeeeed helppp pronto,Measurements show that a honeybee in active flight can acquire an electrostatic charge as great as
1. 1 answer
2. 1,036 views
what is the locomotory organelle for Dictyostelida?
1. 2 answers
2. 387 views
Which of the following products are insoluble in water?a. AgC(2)H(3)0(2) b. MgSO(4) c.Pb(NO3)2 d.Hg(2)CO(3) e.Ca(OH)2 Try
1. 0 answers
2. 483 views
When the following combustion reaction is balanced using the smallest whole number coefficients, determine the coefficients for
1. 0 answers
2. 699 views
how do you solve Fcos29(degree)-210.308-0.58Fsin29=0Solving for F? F(cos269-.58sin29)=210.308 F= 210.308/(cos269-.58sin29)
1. 0 answers
2. 511 views

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