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Questions (1)
The skeletal structures of the two amino acids, glycine and lysine, are given below along with the values of the relevant acid
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Answers (184)
Kyan is right
I think its correct. lle is the least because it has the longest non polar R group, Ser has an OH the strongest polar group, His has NH group but are attached in ring which makes them least polar, Trp has 2 aromatic rings and Phe has 1 aromatic ring.
specifically this is qualitative chem. The two compounds are metal halides and the common condition which the test is proceeded is in acidic condition. The most suitable reagent for that is dil nitric acid.
first you need to draw a molecular orbital diagram. it is with the diagram that can help you identify bonding and antibonding electrons.
both have different polarity. Polar substances can dissolve/mix with each other. non polar substances can dissolve/mix with each other. you cannot mix both polar and non polar substances. example: Oil is non polar and water is polar. you will find two
Reaction: Na2CO3 + CuSO4 --> CuCO3 + Na2SO4 CuCO3 is insoluble and so form ppt. mole ratio: Na2CO3 : CuSO4 1 : 1 actual mole of CuSO4 = Mv = 0.159M x 26.7e-3L =_______moles = moles of Na2CO3. volume of Na2CO3 = n/M where n is the mole of Na2CO3 and M is
a. a pencil and a book (totally different materials) b. this can be aldehyde and ketones c. salt and metal. they both conduct electricity though they have different structures.
ok. matter is everything that surround us. anything that has mass, energy etc. liquid, solid, gases are all matters. even anything that moved having a velocity or kinetic energy or mass or even anything we can't see is matter. i recommend that you read
what in the heck are you talking about???..read the question carefully!!! there's none talking about chemical nature of trichloroethane..how toxicity it is or been produced in closed systems who cares about that!!!..you completely nonsense. what does
this is mostly physics. ensure to give the correct subject so that experts can come at your aid asap.
i guess log is 10g???...stp is standard temperature and pressure. in this condition, 1 mole of gas contains 22.4L. Is it propyrie or propyne??? whateva it is, its an organic compound so would yield H2O and CO2 when combusted completely. here's what you
It looks like this is a practical/experiment type questions that you should already have your the results. It would be easier if you enter your values for the temperatures and pressures and leave the mole calculations and % for help.
Heat (Q) evolved is Q = mc?T where m is the mass in grams, c is the specific heat and ?T is the change in temperature. In this case, the change in temperature is in degreesCelcius and the energy is in calories. You can do conversion in the final answer to
O2, Fe and Cl2 should all have zero enthalpy of formation because, they are pure or in diatomic state. However, Fe and Cl2 are not under standard conditions because standard condition is 25degreesC at 1atm. So to me it should be O2.
ok. You are confusing with the charge and the oxidation number. To me, both are the same, except that they are represented differently; the charge is written or shown in the chemical formula of the ion using a number followed by a sign (2- or 3- etc). The
ok..so write the balance equation; H2SO4 + 2NH3 --> (NH4)2SO4 this shows that 1 mole of sulphuric acid react with 2 moles of NH3 to produce 1mole of ammonium sulphate. The question asks the mass of (NH4)2SO4 produced by 5.00g of NH3 is used. So focus only
recall: human chromosome is represented as XX for females and XY for males. for hemophilic people, h is assigned next to the X chromosome (note, hemophilia is carried or present only on the X chromosome). Ok..the father of the woman (the mother of the boy)
67g of ice is 67/18 = 3.72moles. 6.0kJ/mol means it takes 6.0 kJ to convert 1mole of solid ice into liquid water. so, for 3.72moles requires 3.72x6= 22.333kJ energy input. the energy released is 445.1kJ/mol from NaOH. so 22.333kJ energy from NaOH must be
To me its like this; the [OH] is 0.0025, so we can calculate [H] using [H][OH] = 1e14 and rearranging for [H] gives 1e14/[OH] with [H], we can find pH = -log[H]. Then use pH to find pOH using pH + pOH = 14. hope that helps.
the balance equation is the overall net ionic equation. so use that to obtain the mole ratio between Na2Cr2O7 and KI. calculate the mole of sodium dichromate by m/Mr where m is 0.125g and Mr is molar mass. Then determine the mole of KI with using the mole
Break down the equation into reduction and oxidation half equation. oxidation reaction is I- --> IO3- balance the equation starting with oxygen by adding water, then followed by addition of H+ ions to balance H atoms, and then finally the electrons to
I suggest you first do the dilution of the stock solution by a x10 in order to get 0.001M solution. 1. Pipette out 25mL of the stock solution into a 250mL v.flask, top up with water to the mark. 2. Top up to the mark with water using wash bottle or
2 moles of Al produces 2 moles of Fe. and 750grams of Al is 750g/26gmol-1 = 28.85moles. 2Al is 2x28.85moles = 57.7moles which is equal to the mole of Fe. with this mole, use the formula m = nMr to find the mass, where n is the mole and Mr is the molar mass
% yield = (exp.yield)/(theoretical) x 100% exp. yield = 2.81g to find theoretical yield; 1. Construct a balance equation for water electrolysed into H2 and O2. Note the mole ratio between H2O and H2. 2. calculate the mole of H2O using n = m/Mr where m is
1. construct a balance equation for HCl and Zn reaction and note the mole ratio between HCl and Zn. 2. calculate the mass of Zn from the ore i.e. 36.0% of 7.55g gives the mass of Zinc. 3. Calculate the mole of zinc using n = m/Mr where Mr is the molar mass
the desired molarity is 0.01M. The idea is to take a xgrams of sodium oxalate into a 500mL v.flask and dissolve it in water to make 0.01M solution. The xgrams is what you have to calculate. 1. calculate the moles of sodium oxalate using n = Mv where M is
1. balance equation is; Na2Cr2O7 + 2KI --> 2NaI + K2Cr2O7 mass of Na2Cr2O7 = 0.125g mole of Na2Cr2O7 = m/Mr = 0.125g/Mr =___mole mole ratio Na2Cr2O7 : KI 1 : 2 2.calculate the mole of KI using the mole ratio above and mole of Na2Cr2O7. volume of KI = n/M
indicate your subject instead of just a d!!
the equation simply shows that 2 moles of ammonium iodide reacts with 1 mole of Chlorine gas to produce 2 moles of ammonium chloride with 1 mole of Iodine. You can check for the phase for each chemical so it'll help you to understand more on the reaction.
molarity is the amount of solute dissolving in a liter of solute. H2O in the oxalic is simply water and so does not affect the molarity of the solution. The important part is the mass or mole of the pure oxalic acid. so, find the actual mass of the pure
try this; n = Mv = 0.6x1.2 = 0.72moles so, 0.72moles is the total mole i.e. KOH and water. Since the impure KOH is 84%, then the mole for KOH is; 0.84 x 0.72 = 0.605moles so, m = nMr = 0.605x(molar mass of KOH).
the equilibrium constant is the ratio of the concentration product of the product and the reactant of a particular reaction. i.e. Kc = [NH4+]/[NH3][H+] where Kc is 4.5e8.
incomplete??
incomplete??
1.00g = 11100 cal how much grams in gallons???..how much joules in calories???...knowing these can lead you to your answer...
Q=mc?T where ?T is the change in temperature in degrees, m is the mass in grams and c is the specific heat capacity of water.
use avogadros number 1mole = 6.02e23 atoms how many moles are there in 2.5x10e21 atoms???
the % given is a % by mass. so they are grams. convert the mass to mole for each element divide each mole with the smallest mole round off the moles to 1 sig figure. then you can name them. the empirical formula is C3H6O. this formula can be an aldehyde
3 moles of O2 is produced. use avogadros number 6.02e23 molecules in 1 mole. 1mole = 6.02e23 molecules of O2. how many molecules are present in 3 moles of O2??
yes there are butyl, pentyl and so on. these are called alkyl groups or side chains. they only be side chains if they are attached to the longer carbon skeleton.
the carbon should contain 4 bonds. so CH3COCH3 means that the middle carbon is double bonded to oxygen to make 4 bonds (one bond to each CH3 and double bonded to Oxygen). In ether, the Carbon is single bonded to the oxygen, which will have something like
stream of particles
that depends on the number of moles of the acids that need to be neutralized by the base and the concentration of the base. 1. HNO2 + NaOH --> NaNO2 + H2O i.e. 1 mole base react with 1 mole acid the mole for the HNO2 is cv = 0.1Mx0.025L = 0.0025mol = mole
Yes you mistake in identifying the main chain. the main chain is the longest chain, i.e. from the left CH3 to the bottom CH3 which contains 7 carbons i.e. heptane. so, branch CH3 and CH2CH3 are on carbon 4 (4-ethyl-4methyl)....
prioritize the longest chain as the parent/root. so the chain on the right has 3 carbons (propane). the other two are shortest and so they are branches.
2,2 dimethyl means two CH3 branches attached to the second carbon of the parent chain. 2-ethyl means the -CH2CH3 chain attached to the second carbon of the parent chain. the parent chain is the longest chain. the longest chain in the formula you gave
ensure the equation is balanced. obtain the mole ratio between Zn and Ag i.e. 1 mole of Zn produces 2 moles of Ag convert the mass of Ag (m=5.4g) into mole using m/Mr where Mr is the molar mass of Ag. take note of that mole for Ag and use it to calculate
NaCl solubility at 100degrees is 39.1g/100mL. so you can use this to calculate how much will dissolve in 750mL of water.
the energy of the photon is hc/lamda where h is the Planck's constant, c is the speed of light and lamda is the wavelength in meters.
ppm is mg/L so 1.08e3ppm is 1.083e3mg/L. you can convert this to mole/L by simply converting the mg to grams then to mole using m/Mr where m is the mass in grams and Mr is the molar mass of Na (periodic table). once you get that, you will end up with a
