Questions Asked on
June 15, 2018

maths
Simplify :1/1cosx +1/1+cos x
asked by Anne 
geometry
Determine whether the conjecture is true or false. If false, give a counterexample. Given: ∠A is supplementary to ∠B and ∠B is supplementary to ∠C. Conjecture: ∠A is supplementary to ∠C. Select one: a. False; they could be right angles. b.
asked by homework 
Chemistry
If the reaction between H2 and I2 to form HI were at equilibrium and an additional 0.25 moles of H2 were added to the reaction, what would happen? The equilibrium would shift in the direction of the products. The equilibrium would shift in the direction of
asked by HQade 
Chemistry
What is the overall cell potential for this redox reaction? Ca2+ + 2Li = Ca + 2Li+ Ca2+ + 2e = Ca 2.87 V Li = Li+ + e 3.05 V
asked by Student 
analytical chemistry
Calculate the ph during the titration of 20.0ml 0.5000M ethanoic acid Ka=0.0000175 with 0.500M NaOH after the addition of 0.0ml and 10.0ml NaOH
asked by Anonymous 
chemistry
Given the enthalpy reactions below, 2 X + O2 → 2 XO ΔHrxn = 1301.8 kJ/rxn XCO3 → XO + CO2 ΔHrxn = 169.7 kJ/rxn What is the ΔHrxn for this reaction? 2 X + O2 + 2 CO2 → 2 XCO3
asked by kenzie 
math
There are 2.2 pounds in one kg.If Mary Catherine has 2.5 kg hamburger meat for her cookout ,how many pounds of hamburger meat does she have.
asked by Ja'Quavius 
Maths
A plane flies northward for 430km, it then flies eastwards for 380km.How far is it from the starting point?
asked by DUKE 
Algebra
The foot of an extension ladder is 9ft from a wall. The height that the ladder reaches on the wall and the length of the ladder are consecutive integers. How long is the ladder?
asked by Ethan 
chemistry
2 C6H6 + 15 O2 → 12 CO2 + 6 H2O ΔHrxn = 6542 kJ/rxn If 8.88 g of C6H6 (FW = 78.114 g/mol) is burned and the heat produced from the reaction is used to heat 6354 g of water at 22.5o C, what is the final temperature of the water (swater = 4.184 J/g C)?
asked by kenzie 
calculus2
Find its area. y = sec^2(x), y = 8 cos(x), −π/3 ≤ x ≤ π/3
asked by A 
chemistry
2 Fe2O3 → 4 Fe + 3 O2 ΔHrxn = 824.2 kJ/rxn How much heat will occur in the decomposition of 72.7 g of Fe2O3 (FW: 159.687 g/mol)? (Write answer to a whole number, zero places past decimal point)
asked by kenzie 
Chemistry
A student prepares a 0.28 M solution of acetic acid. If the Ka of the acid is 1.76 x 10^5, then what is the pH of the solution? 4.76 0.55 5.31 2.65 I got 2.65 as my answer. :)
asked by HQade 
English
Why Is It Important to Beowulf's Image As An Epic Hero That He Faced Grendel Without A Weapon? A.)Grendel Is The Embodiment Of Evil And Evil Doesn't Fight With A Weapon. B.)By Giving Up His Sword, Beowulf Showed Both Superior Strength And Superior Ethics
asked by Joshua 
Chemistry
A weak acid with an initial pH of 3.2 was titrated with a strong base. 15 mL of 0.1 M NaOH was added to the acid to reach the equivalence point at a pH of 8.6. What would you expect the approximate pH of the analyte to be after the first 5 mL of 0.1 M NaOH
asked by Jason 
Chemistry
For the second order reaction: A > products the plot of what term versus time would yield a straight line? 1/[A] ln[A]/[A] [A] ln[A] I'm pretty certain it's ln[A]?
asked by HQade 
Chemistry
For the following reaction, the partial pressures are listed in the table: Substance Equlibrium H2S 5.4 I2 1.2 HI 0.43 S 7 If the Kp of the reaction is 0.134, which direction would the reaction need to go to establish equilibrium? H2S(g) + I2(s) 2HI(g) +
asked by jenny 
Maths
Of 20 girls 16 plays hockey,12 plays tennis and 4playsbusket every girl plays at least one game and 2plays all the three games how many plays 2and only 2games
asked by Alice 
Science
Doesn't a diploid cell has 46 chromatids and duplicate in to 92 chromotids? why do people say 46 chromosomes in a deploid cell?
asked by Science 
Chemistry
When the pH of a buffer is equal to its pKa, what is the amount of dissociation that has occurred? 1 % 25 % 50 % 100 %
asked by HQade 
Math
A watch loses 30 second hour. If the watch was set right on Sunday at 11:30 p.m. What day and time did it show after 10 hours? 10 * 30 = 300 5 min
asked by Kiff