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December 21, 2014

Posts by write2khin


Total # Posts: 27

immunology
- Case scenario: explain why the likelyhood of allergies can be inherited from parent to child but the type of allergy (e.g. peanuts) cannot. I am a bit confused, any one can help me solved thanks.
December 8, 2012

chemistry
Using data in table below and S °(C2H6(g))= 229.5 J·mol-1·K-1, calculate ÄfS° for C2H6(g) in J·mol-1·K-1. Compound S °, J·mol-1·K-1 Compound S °, J·mol-1·K-1 C(s) 5.69 H2(g) 130.6 I am sorry , last ...
May 15, 2010

chemistry
Using data in table below and S °(CaSO4·H2O(s))= 194.0 J·mol-1·K-1, calculate Delta fS° for CaSO4·H2O(s) in J·mol-1·K-1.
May 13, 2010

chemistry
Using data in table below and S °(CaSO4·H2O(s))= 194.0 J·mol-1·K-1, calculate ÄfS° for CaSO4·H2O(s) in J·mol-1·K-1. CompoundS °, J·mol-1·K-1 C(s) 5.69 H2(g) 130.6 N2(g) 191.5 O2(g) 205.0 Na(s) 51.0 Cl2(g...
May 13, 2010

Chemistry
A 0.10 M solution of a weak monoprotic acid has a hydronium-ion concentration of 5.0 ´ 10^-4 M. What is the equilibrium constant, Ka, for this acid? a. 5.0 ´ 10^-2 b. 5.0 ´ 10^-3 c. 2.5 ´ 10^-4 d. 2.5 ´ 10^-5 e. 2.5 ´ 10^-6 2. (Points: 1) ...
May 13, 2010

Chemistry
A 0.10 M solution of a weak monoprotic acid has a hydronium-ion concentration of 5.0 ´ 10-4 M. What is the equilibrium constant, Ka, for this acid? a. 5.0 ´ 10-2 b. 5.0 ´ 10-3 c. 2.5 ´ 10-4 d. 2.5 ´ 10-5 e. 2.5 ´ 10-6 2. (Points: 1) What is ...
May 13, 2010

chemistry
Using data in table below and S °(CaSO4·H2O(s))= 194.0 J·mol-1·K-1, calculate ÄfS° for CaSO4·H2O(s) in J·mol-1·K-1. Compound S °, J·mol-1·K-1 C(s) 5.69 H2(g) 130.6 N2(g) 191.5 O2(g) 205.0 Na(s) 51.0 Cl2(g...
May 12, 2010

chemistry
Compound S °, J·mol-1·K-1 C(s) 5.69 H2(g) 130.6 N2(g) 191.5 O2(g) 205.0 Na(s) 51.0 Cl2(g) 223.0 Ca(s) 154.8 S(s) 31.8
May 12, 2010

chemistry
Using data in table below and S °(CaSO4·H2O(s))= 194.0 J·mol-1·K-1, calculate ÄfS° for CaSO4·H2O(s) in J·mol-1·K-1.
May 12, 2010

Chemistry
If an amount of heat q is applied to an object and its temperature changes by ÄT, the amount of heat that must be applied to change the temperature by 10ÄT is
May 12, 2010

Chemistry
1. How much heat in kilojoules is needed to bring 2.00 kg of water from 27.7 to 82.6 ¡ãC (comparable to making four cups of coffee)? 2. Consider the reaction: CH4(g) + 2O2(g) ¡ú CO2(g) + 2H2O(g) Use data in table below Compound S¡ã, J&...
May 12, 2010

Chemistry
Select the two conditions that must be met by a thermochemical equation so that its standard enthalpy change can be written as ÄfH°. a) One mole of each reactant is used. b) All substances are at 0°C and 1.013x105 Pa pressure. c) The reactants are found in their ...
May 12, 2010

Chemistry
Consider a 790-mL container at 21 °C in which the pressure of argon is 1.98x106 Pa. a) What mass of argon (in g) is present in this container? b) How many molecules is this?
May 3, 2010

Chemistry
Please help
May 2, 2010

Chemistry
Consider a 980-mL container at 133 °C in which the pressure of nitrogen oxide is 0.394x106 Pa. a) What mass of nitrogen oxide (in g) is present in this container? b) How many molecules is this? (a)----g (b)-----molecules
May 2, 2010

chemistry
An aqueous solution of Na2SO4 has a molal concentration of 0.293 mol kg-1. Its density is 1.0350 g mL-1. Calculate the molar concentration of Na2SO4. ----- mol L-1 Calculate the mass percent of Na2SO4 in the solution. ------- % What is the mole fraction of Na2SO4 in the ...
May 2, 2010

chemistry
Oxygen gas can be generated by heating KClO3 in the presence of a catalyst. KClO3 ----> KCl + O2 (unbalanced) What volume (in L) of O2 gas will be generated at T = 25 oC and P = 10.26x104 Pa from 1.28 g KClO3?
May 1, 2010

chemistry
A pressurised can of whipped cream has an internal pressure of 1.09x105 Pa at 25.0 oC. If it is placed in a freezer at -15.0 oC, what is the new value for its internal pressure (in Pa)? explain to me! thanks
May 1, 2010

chemistry
Two ions which have a simlar shape are? a. CO32- and SO32- b. OH- and SO32- c. PO33- and NO3- d. SO32- and PO33- e. CO32- and PO33- I think (a) not sure plez expalin to me
April 23, 2010

chemistry
Which of the following groups of elements is arranged in order of increasing electronegativity? a. Br < Li < C b. K < Mg < O c. Na < K < N d. Mg < Li < C e. Ca < Cl < C
April 23, 2010

chemistry
Which of the following compounds would have the highest melting point? a. CsF b. LiF c. NaBr d. LiCl e. NaCl
April 23, 2010

chemistry
i think 2
April 14, 2010

chemistry
For a 0.001 molar solution of NH4HCO3, the van’t Hoff factor would be about a. 1. b. 2. c. 3. d. 4. e. 5.
April 14, 2010

Mathematic
solve x2 + 2x - 3 < 0 and graph. Anyone can solve the problem please.
April 13, 2010

chemistry
1) All of the following are oxidation-reduction reactions except (a) 2Al(s) + Fe2O3(s) ---> A12O3(s) + 2Fe(s) (b) (NH4)2Cr2O7(s) ---> Cr2O3(s) + N2(g) + H2O(1) (c) Cu(s) + 2H2SO4(aq) ---> CuSO4(aq) + SO2(g) + 2H2O(1) (d) Hg(NO3)2 + 4KI ---> K2HgI4(aq) + 2 KNO3(aq...
April 10, 2010

chemistry
it is to work to find the net ionic equation for question iii
April 10, 2010

chemistry
1) All of the following are oxidation-reduction reactions except (a) 2Al(s) + Fe2O3(s) ¨A12O3(s) + 2Fe(s) (b) (NH4)2Cr2O7(s) ¨ Cr2O3(s) + N2(g) + H2O(1) (c) Cu(s) + 2H2SO4(aq) ¨ CuSO4(aq) + SO2(g) + 2H2O(1) (d) Hg(NO3)2 + 4KI ¨ K2HgI4(aq...
April 10, 2010

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