Friday
July 25, 2014

Posts by Sindy


Total # Posts: 33

3rd grade math
Sven is thinking of two numbers. The sum is 12. The difference is 4. What are the two numbers?

physics
a motorboat is heading across a river at 6km/h in a direction making an angle 60 degree to the current. current is moving boat downstream at 3 km/h. what is the resultant velocity?

history
what is another name for a nation

math
Thanks

math
What is a 72 times 50. My answer is 3,600

geometry
The coordinates of triangle ABC areA(0,0), B(2,6), and C(4,2). Using coordinates geometry; prove that, if the midpoints of sides AB and AC are joined, the segment formed is parallel to the third side and equal to one- half the length of the third side.

geometry
The coordinates of triangle ABC areA(0,0), B(2,6), and C(4,2). Using coordinates geometry; prove that, if the midpoints of sides AB and AC are joined, the segment formed is parallel to the third side and equal to one- half the length of the third side.

statistics
4(0.4)K to the power negetive 0.6 L to the power O.6,over K)all in brackets

statistics-varsity level
(3L to the power 0.5. Over L to the power 2)all in brackets to the power 2 outside brackets?

Maths
Any help with the following would be greatly appreciated. I don't understand how to use the information given to create the equation. 1) A car travels between A and B at an average speed of 60 km/h. If the car increased its average speed to 100 km/h it would take 10 minute...

Maths
I'm really struggling with word problems right now. Got through 20 just three left. Can someone please give me some pointers or the first few steps? 1. A sum of money is divided between A, B and C in the ratio 1 : 2 : 3. However, before the money is divided C dies and it i...

Maths
Thanks!

Maths
Two bike riders X and Y both start at 2 pm riding towards each other from 40 km apart. X rides at 30 km/h, Y at 20 km/h. If they meet after t hours, find when and where they meet.

social science
To compare one person’s test scores to the scores of all other people who took the test, psychologists must know something about the test’s? projective nature subjective nature length norms

Chemistry
I did is again: Benzoic acid: q= m*Cs*T Cs = 4.217kJ/g°C q1 + q2 = 0 [m*Cs*T] + [26.38kJ] = 0 [.876g*Cs*8.518°C]+ [26.38kJ] = 0 7.462g°C * Cs = -26.38kJ Cs= -3.535kJ/g°C to get the molar enthalpy: -3.535kJ/g°C * 114g/mol= 403.03kJ/mol* °C

Chemistry
Benzoic is 26.38 and the temp rises 8.518

Chemistry
this is so confusing =(

Chemistry
36913.6 J/g * 114g/mol= -4208150.4J/mol and to convert that to kJ= -4208150400 kJ/mol. the correct answer is -5116 kJ/mol

Chemistry
Okie I get 36913.6J/g* degree C but how do I change that into kJ/mol?

Chemistry
Okie i get Cp= 42178.8J/g delta C and for the octanol im using q= m*Cs*T q= 0.876*Cs*8.158 q= 7.1395g degreeC * Cs In your work i don't understand thisequation: [mass octanol x specific heat octanol x delta T] + [Cp x delta T] = 0

Chemistry
The combustion of benzoic acid releases 26.38kJ/g and is often used to calibrate a bomb calorimete. The combustion of 1.045g of benzoic acid caused the temperature of the calorimeter to rise by 5.985 degreeC.Using the same calorimeter, a sample of 0.876g of C8H18 was burned. t...

Chemistry
What is the mass of La2(C2O4)3*9H2O, can be obtained from 650mL of 0.0170 M aq solution of LaCl3 by adding a stoichiometric amount of sodium oxalate. I don't know how to balance the equation for this..i started: LaCl3+ Na2C2O4 -> La2(C2O4)3*9H2O + NaCl

chem
If a student needs to prepare 50g of bromobenzene and expects no more than a 75% yieldl, how much benzene should the student begin with if the yield is 75%? C6H6(l)+ Br2(l) --> C6H5Br(l)+ HBr(g) I calculated the moles of C6H5Br as .3185. But ion the end my answer is 18.7g H...

us history
HOW DID THE THREE-FITHS COMPERMISED LEAD TO THE CIVIL WAR!

science
animals cause ___________________ weathering by burrowing in and moving underground soil around.

CHEMISTRY!!-
The following date were obtained for the reaction 2ClO2(aq)+2OH(aq)->ClO_3^-(aq)+ClO_2^-(aq) + H2O(l) where rate= delta[ClO_2]/ delta t [ClO_2]0 [OH^-1]0 Initial Rate (mol/L) (mol/L) (mol/L*s) .0500 .100 5.75*10^-2 .100 .100 2.30*10^-1 .100 .050 1.15*10^-1 a) Determin the r...

URGENT MATHS
Ok thanks. The problem is, I'm from Australia and we don't use those measurements. But I MIGHT be able to use other Australian measurements.

URGENT MATHS
I got 2 questions and I've been stuck on them for days and its due in 2 days. 1. For a quick way of doing multiplication, you can do: for example: 81 x 89=? First you do 1x9=9 in which case you have to add '0' in front of it to make it 09. Then you add 1 to any of ...

science
As temperature rises , solids generally become more soluble in water , but gases become less soluble .If a soft drink contains high concentrations of sugar and carbon dioxide , wich of the following may be expected to happen if it is cooled down ? 1. sugar may precipitate out ...

science
As temperature rises , solids generally become more soluble in water , but gases become less soluble .If a soft drink contains high concentrations of sugar and carbon dioxide , wich of the following may be expected to happen if it is cooled down ? 1. sugar may precipitate out ...

science
plz answer me

science
As temperature rises , solids generally become more soluble in water , but gases become less soluble .If a soft drink contains high concentrations of sugar and carbon dioxide , wich of the following may be expected to happen if it is cooled down ? 1. sugar may precipitate out ...

language arts
what follows a linking or action verd After a linking verb, there'll be a predicate noun or predicate adjective: ~~She is my sister. (is=linking verb; sister=predicate noun) ~~Delilah is very tall for a fourth grader. (is=linking verb; tall=predicate adjective) After an ac...

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