Wednesday
July 23, 2014

Posts by Saira


Total # Posts: 187

science
when people remember memories after a memory loss, would you call those memories flashbacks or is there a different term? and is it possible for someone to lose memory for a specific event but remember everything after that? what is the term and are there any websites which ca...

Health
how can a disabled wheelchair person lead a normal life? how do they cook? etc

Math!!!! *plz help*
Use Brackets. Write Each Expression so that it equals the number in blue. a) 8+2x5 50 b) 6x3+1 24 c) 1+6x3+1 25 d) 2+8x5-1 49 e)7+14\7-5 14 f)12\2x5-4 2 Help Me Please i dont get what to do and how to.... ( \ stands for division)

Math
thnx

Math
50 24 25 49 14 2 = numbers in blue in my textbook

Math
Use Brackets. Write Each Expression so that it equals the number in blue. a) 8+2x5 50 b) 6x3+1 24 c) 1+6x3+1 25 d) 2+8x5-1 49 e)7+14\7-5 14 f)12\2x5-4 2 Help Me Please i dont get what to do and how to.... ( \ stands for division)

English
What does fantastical mean? My essay topic is compare the fantastical in Poe and lawrence's "the rocking horse"

chemistry
What is the approximate energy required to raise the temperature of 5 L of air by 230 °C? The volume is held constant. (Assume air almost entirely consists of nitrogen, oxygen, and argon, and that it is initially at 273 K. Cv(specific heat) for nitrogen=20.7,oxygen=21 and ...

chemistry
What is the approximate energy required to raise the temperature of 5 L of air by 230 °C? The volume is held constant. (Assume air almost entirely consists of nitrogen, oxygen, and argon, and that it is initially at 273 K. Cv for nitrogen=20.7,oxygen=21 and argon=12...

languagge
whats the natural resources of Japan ?

math grade 5
4> OOps you have to spin it 3 times not 2 times

math grade 5
My sister in grade 5 needs help but i dunt exactly know how to do the answers myself, so if someone can help me out i can explain to her better. Thanks 3. You are using a tree diagram with 12 branches to show the possible outcome of a probability experiment What might the expe...

science
a ball is thrown from a point 100m above the ground with speed 20m/s.find the velocity,direction and magnitude with which it strikes the ground?

sciene
thanks alot ms.sue

sciene
how can solar power work at night

health
thank you Ms.sue and bobpursley.

health
1. Carbohydrates 2. Protein 3. Fat 4. Minerals 5. Vitamins 6. Water

health
a dinner that includes all six nutrients? what can that be.please help me.

science 5
im not sure

science 5
ts the est source of power in toronto please tell me i need help

health
i also need the names of the different fast food so i can research there ingrdients. thank you

health
thanks

health
need help

health
unhealthy fast food you can find list ingredents

ancient civillation
we stared this unit 2 days ago and we have a project on them they are china egypt and greaPr

ancient civillation
which lasted the longest. which lasted shortest. which began earliest. which began latest. Also what were the civillations that lasted 3000 years or more. please help i`m confused.

social studies
thank you writeacher

social studies
i need help for my project please help

social studies
the habbitat and clothing of Ancient Civilizations – ancient Egypt please help. Thanks

math
what is 20 Jamaican dollars equal in Canada.

Chemistry
nvm i got it had to conver delta S J/k to kj/k

Chemistry
How do i calculate: What is is ΔG° at 25 °C? 2O3(g) → 3 O2(g) ΔH° = -284 kJ ΔS° = 139 J/K i know the equation is: ΔG°= ΔH°- t (ΔS) im not getting right answer

spelling
decades:sad ,dad ...

spelling
i also cant figure words for decades

spelling
perimeter: meter ,merit litre:let

spelling
can you list some smaller words that are in perimeter and litre. thank you

writting
Thank you . You helped me alot.

writting
Instead of these words i want more powerful words that mean the same but is more powerful.

writting
what does hewn mean? Also can i get a list of synonyms for objects , cutting , impact and act. please help!

4th grade
maybe there is 6 pennies and 30 dimes.

3rd grade
heres more rhyming worlds: flick , Kick.

2nd grade
I came up with the same number as chelsea.

Chemistry
IN the polystyrene beaker, mix 20mL of 0.1 M Acetic acid and 25mL of 0.1M Sodium Acetate and immediately measure the pH. Remove the electrode and add 5ml of 0.1 M HCl to this buffer. Stir the solution and measure the pH. _______________ INFO: concentration of acetic acid= 0.1M...

Chemistry
Yes they go together

Chemistry
Part A: Unknown Acid use 1gram and mix with 120 mL of distilled water Determine the concentration of the acid by titrating with 0.0998 M of NaOH Concentration of NaOH= 0.0998M Volume of NaOH= 3.5 mL # moles of NaOH= Initial Concentration of Weak Acid- Show Calculation of Ka an...

Chemistry
Hydrolysis of Salt: Using the universal indicator we had to determine the pH of sodium acetate, and the results i got was pH- 8.5 . Now i have to explain this with a equation to show hydrolysis. I don't know how to write it out but, Sodium is not hydrolyzed and acetate is ...

Chemistry
Calculate the pH of a 0.10 M solution of barium hydroxide, Ba(OH)2.

duratioon
how to calculate duration of a balance sheet

4th grade
please help

4th grade
Before farms before did not have electronics so it was hard to to work.Also Farmers did not use fertilizers so it also was hard to grow crops.And there is more about the lord and peasants.

4th grade
explain how farms today are different than medieval farms . Compare the farms. list a lot of differences and same things . please help!

social studies, 4 thgrade
what type of games do village people now play.

4th grade
Thanks Ms.sue!!!

4th grade
explain how village customs today are different than medieval times village customs.please help

4th grade
You have GREATER chance with box b because there is only 1 yellow marble and there is 2 red marbles so most of the marbles are red,but box a has almost the same amount of red and yellow marbles.

Chemistry
So its deltaTf = Kf * m m= 9.70°C/-1.86°C kg/mole = 5.2515 m (molality) What i'm not sure about is, if Delta Tf= in this equain is tfinal-t initial or its the freezing point as ypu mentioned .5C

Chemistry
Hey guys I did a lab and I have to answer the questions relating to the lab. I did question can someone please check if these are accurate 1. Calculation to Determine the molecular weight of unknown substance Mass of unknown used: 2.0232 g Mass of water used: 50.0 g (0.05kg) K...

Chemistry
Raoult's Law and Ionic or Organic Solutions At 55.0 C, what is the vapor pressure of a solution prepared by dissolving 62.8 g of LiF in 247 g of water? The vapor pressure of water at 55.0 C is 118 mmHg. Assume complete dissociation of the solute.

Chemistry ....Please Double check
If 4.55 g of sodium sulphide and 15.0 g of bismuth nitrate are dissolved in separate beakers of water which are then poured together, what is the maximum mass of bismuth sulphide, an insoluble compound, that could precipitate? What reactant was the limiting reactant? Na2S + Bi...

Chemistry
Rank the following ionic compounds by lattice energy. Highest to Lowest LiCl MgO Na2O Beo Na2S

Chemistry ....Please help
Is this Correct? 3Na2S + 2Bi(NO3)3 -->Bi2S3 + 6Na^+(aq)+ 6NO3-(aq) A.) 4.55g/ 78.05= 0.059 moles Na2S 15.0g/ 394.99= 0.038 moles Bi(NO3)3 B.) Na2S= 0.059/ 3= 0.019 Bi(NO3)3= 0.038/ 2= 0.019 (Just for general knowledge if this was a different question, and after dividing by ...

Chemistry ....Please help
If 4.55 g of sodium sulphide and 15.0 g of bismuth nitrate are dissolved in separate beakers of water which are then poured together, what is the maximum mass of bismuth sulphide, an insoluble compound, that could precipitate? What reactant was the limiting reactant? Na2S + Bi...

Art
I need help understanding the Principles and Elements of Visual Arts with the help of images which examplify them...

psychology
Well elemenatry my dear isn't it obvious that the correct choice is B.

gr.10 mathh!
factor the equation: -6x^2+15x+36 please show me the steps in answering this problem. thanksss..)

Chemistry
Which of the following mixtures would result in buffered solutions when 1.0 L of each of the two solutions are mixed? a) 0.10 M NaCl and 0.10 M NaNO2 b) 0.10 M NaCl and 0.10 M NH4Cl c) 0.10 M CH3NH2 and 0.15 M CH3NH3Cl d) 0.10 M HCl and 0.05 M NaNO2 e) 0.10 M HCL and 0.20 M Na...

Chemistry
I am not really sure how to do this: Calculate the pH when 1.0*10^-3 moles of solid NaOH is added to a) One liter of 9.1*10^ -6 M HCL b) One liter of a solution containig 0.05 M CH3COOH and 0.1 M CH3CooNa

Chemistry
Buffers- Common Ion effect IS this Correct Calculate the pH of a aqueous solution containing 0.15 M HNO2 and 0.20 M NaNO2 (aq). The Ka of nitrous acid is 4.0*10^-4. HNO2 + H20 <--> NaNO2- + H30^+ Inital 0.15 0.20 X Final 0.15 0.20 Ka= [H30+][NaNO2]/ [HNO2] 4.0*10^-4 = [H...

Chemistry
Hydrolysis of Salt: Using the universal indicator we had to determine the pH of potassium chloride, and the results i got was pH- 7.5 . Now i have to explain this with a equation to show hydrolysis. I dunno how to write it out, but i think KCL should be neutral.

Chemistry
This is whta i have so far...The Ka is 1.8*10^-5 so pKa is= -log(1.8*10^-5) = 4.74 pH= pKa+log ([C2H3O2^-]/[HC2H3O2]) = 4.47+ log ([C2H3O2^-]/[HC2H3O2])

Chemistry
I actually posted this up before and Gk helped out but i don't understand the steps what do i enter for the pka for the first one? __________________________________________ I did an experiment on Buffers: In a polystyrene beaker, mix 20 ml of 0.1M Acetic acid ad 25 ml of ...

Chemistry
OMg iforgot i posted it up befoe sorry

Chemistry
A 80.0 mL volume of 0.25 M HBr is titrated with 0.50M KOH. Calculate the pH after addition of 40.0 mL of KOH.

Chemistry
A 80.0 mL volume of 0.25 M HBr is titrated with 0.50M KOH. Calculate the pH after addition of 40.0 mL of KOH.

Chemistry
I did an experiment on Buffers: In a polystyrene beaker, mix 20 ml of 0.1M Acetic acid ad 25 ml of 0.1 M sodium acetate and immediately measure the pH. Remove the electrode and add 5 ml of 0.1 M HCL to this buffer. Stir the solution and measure the pH. This is my data: Conc.of...

Chemistry
A 0.040M solution of a monoprotic acid is 14% ionized. Calculate the Ka for the weak acid. ---------------- so: HX <---> H+ + X- Ka= [H+][X-]/ [HX] Since its a monoprotic acis i know the concentration of H and X will be equal And the HX will be 86% (100%-14%) BUt i m not...

Chemistry
Imagine that you are in chemistry lab and need to make 1.00 L of a solution with a pH of 2.70. You have in front of you * 100 mL of 6.00×10−2 M HCl, * 100 mL of 5.00×10−2 M NaOH, and plenty of distilled water. You start to add HCl to a beaker of water w...

Chemistry
[CH3COOH] + [CH3COO-]= 0.100 M pH = pKa + log [CH3COO-] / [CH3COOH] 5.00 = 4.760 + log [CH3COO-] / [CH3COOH] 10^0.24 =1.74 = [CH3COO-]/ [CH3COOH] I have an idea how to solve it but i dunt know how to get the M of CH3COO AND CH3COOH

Chemistry
A beaker with 150 mL of an acetic acid buffer with a pH of 5.00 is sitting on a benchtop. The total molarity of acid and conjugate base in this buffer is 0.100 M. A student adds 5.60 mL of a 0.280 M HCl solution to the beaker. How much will the pH change? The pKa of acetic aci...

Chemistry
A new potential heart medicine, code-named X-281, is being tested by a pharmaceutical company, Pharma-pill. As a research technician at Pharma-pill, you are told that X-281 is a monoprotic weak acid, but because of security concerns, the actual chemical formula must remain top...

1st grade
You have to clean your room because its your room not your moms.

4th grade Math
A polygon can be any shape not just shapes with 4 angles. anonymous is right.

Chemistry
WHen i did it the answers i got was order of reaction m= 2 and k = 4.6 Can someone please double check

Chemistry
i need help with a rate law question: The reaction is 2ClO2(aq) + 2OH -(aq)---> ClO3-(aq)+ ClO2-(aq) + H2O(l) Experiment 1: [ClO2]0= 0.0500 [OH-]0= 0.100 INITIAL RATE= 5.75*10^-2 Experiment 2: [ClO2]0= 0.100 [OH-]0= 0.100 INITIAL RATE= 2.30*10^-1 Experiment 3: [ClO2]0= 0.10...

Chemistry..Please Help
thank you i got the answers

Chemistry..Please Help
HENRY'S LAW I did the first one im not sure how to do the 2 and the 3rd question. 1. What is the Henry's law constant for CO2 at 20{C}? C=kP K=c/p = 3.70*10^-2/1.00atm= 0.037 2. What pressure is required to achieve a CO2 concentration of 6.00×10−2 at 20{C}?...

Chemistry..
oops sorry when i multiply (0.002 Litres)(0.138) the answer i get is 0.000276 and kg was an accident

Chemistry..
A protein subunit from an enzyme is part of a research study and needs to be characterized. A total of 0.180 g of this subunit was dissolved in enough water to produce 2.00 mL of solution. At 28C the osmotic pressure produced by the solution was 0.138 atm. What is the molar ma...

Chemistry please help
thank you

Chemistry please help
Hey guys I did a lab and I have to answer the questions relating to the lab. I did question can someone please check if these are accurate 1. Calculation to Determine the molecular weight of unknown substance Mass of unknown used: 2.0 g Mass of water used: 50.0 g (0.05kg) Kf =...

Chemistry
A mass of 0.630 g of NaCl is dissolved in 525 g of water. CAlculate the molality. mass of NaCl= 0.630g mass of H20= 525g molar mass of NaCl= 58.44 This is what i did it keeps telling me the answer is wrong. Convert grams to moles of NaCl 0.630 * 1 mol NaCl/58.44= 0.01078 Molal...

MATH GRADE 3
THANKS BOBBI

MATH GRADE 3
AT THE SPORT STORE THERE WERE 7 BIKES,1 UNICYCLE,AND 5 CARS PARKED IN THE LOT. HOW MANY WHEELS WERE THERE IN TOTAL? GIVE A NICE EXPLANATION WITH THE ANSWER PLEASE HELP.

CHemistry
Would someone please explain to me what intermolecular forces are. I don't really understand the whole concept.

CHemistry
My professor gave us these question in call and we solved for it in class, however im not sure how we got the answers. I dunt really understand the concept of intermolecular forces if some can please help me i have a quiz tomorrow. A. For each pair of substance, identify the k...

Chemistry
What happens to these physical properties as the strength of intermolecular forces increases? My answers are there as well but its not correct Increase or decrease? a) melting point - increases b) vapor pressure-increases c) boiling point- increases d) viscosity - decreases e)...

Chemistry
thanks u i got that but wasnt sure if its right

Chemistry
What is the solubility of calcium cholride

Chemistry
Write out the Ka and Kb for the biocarbonate ion with chemical equation: Would this be correct: HCO3^-(aq) <--> H+(aq) + CO3^-2(aq) Ka = [H+][CO3-2]/[HCO3- H2O + CO3-2(aq) <--> HCO3-(aq) + OH-(aq) Kb = [HCO3-][OH-]/[CO3-2] Or in my textbook there a chart that says:...

3rd grader needs help with grammar
Its my classmates and I.

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