Questions and answers by

Saira

Questions (82)

My teacher said that Canada’s currently in the expansion phase (from the business cycle), but why is that so? What reasons
1. 1 answer
2. 474 views
Draw a flowchart to calculate the average of 50 students in one subject.
1. 3 answers
2. 3,512 views
Tony is 2/3 as old as Pete; the difference in their age is 4 years. How old is Pete?
1. 4 answers
2. 539 views
If Rita can type 55 words a minute, how many minutes to the nearest minute will it take her to type a 1695-word article?
1. 1 answer
2. 626 views
when people remember memories after a memory loss, would you call those memories flashbacks or is there a different term?and is
1. 1 answer
2. 485 views
how can a disabled wheelchair person lead a normal life? how do they cook? etc
1. 1 answer
2. 819 views
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
1. 1 answer
2. 642 views
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
1. 3 answers
2. 546 views
What does fantastical mean?My essay topic is compare the fantastical in Poe and lawrence's "the rocking horse"
1. 1 answer
2. 405 views
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°=
1. 1 answer
2. 687 views
can you list some smaller words that are in perimeter and litre. thank you
1. 6 answers
2. 392 views
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
1. 1 answer
2. 677 views
Part A:Unknown Acid use 1gram and mix with 120 mL of distilled water Determine the concentration of the acid by titrating with
1. 2 answers
2. 662 views
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
1. 1 answer
2. 520 views
Calculate the pH of a 0.10 M solution of barium hydroxide, Ba(OH)2.
1. 1 answer
2. 1,335 views
how to calculate duration of a balance sheet
1. 0 answers
2. 458 views
explain how farms today are different than medieval farms . Compare the farms. list a lot of differences and samethings . please
1. 4 answers
2. 337 views
what type of games do village people now play.
1. 1 answer
2. 352 views
explain how village customs today are different than medieval times village customs.please help
1. 2 answers
2. 275 views
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
1. 3 answers
2. 635 views
Raoult's Law and Ionic or Organic SolutionsAt 55.0 C, what is the vapor pressure of a solution prepared by dissolving 62.8 g of
1. 2 answers
2. 701 views
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
1. 1 answer
2. 1,070 views
Rank the following ionic compounds by lattice energy.Highest to Lowest LiCl MgO Na2O Beo Na2S
1. 1 answer
2. 1,042 views
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
1. 2 answers
2. 571 views
I need help understanding the Principles and Elements of Visual Arts with the help of images which examplify them...
1. 0 answers
2. 574 views
factor the equation: -6x^2+15x+36please show me the steps in answering this problem. thanksss..)
1. 2 answers
2. 740 views
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
1. 1 answer
2. 1,593 views
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
1. 1 answer
2. 500 views
Buffers- Common Ion effectIS this Correct Calculate the pH of a aqueous solution containing 0.15 M HNO2 and 0.20 M NaNO2 (aq).
1. 1 answer
2. 1,341 views
Hydrolysis of Salt:Using the universal indicator we had to determine the pH of potassium chloride, and the results i got was pH-
1. 1 answer
2. 530 views
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
1. 3 answers
2. 1,236 views
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.
1. 2 answers
2. 1,416 views
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.
1. 3 answers
2. 2,405 views
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
1. 2 answers
2. 709 views
A 0.040M solution of a monoprotic acid is 14% ionized. Calculate the Ka for the weak acid.---------------- so: HX <---> H+ + X-
1. 1 answer
2. 2,978 views
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
1. 2 answers
2. 3,095 views
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
1. 2 answers
2. 1,024 views
A new potential heart medicine, code-named X-281, is being tested by a pharmaceutical company, Pharma-pill. As a research
1. 2 answers
2. 1,476 views
i need help with a rate law question:The reaction is 2ClO2(aq) + 2OH -(aq)---> ClO3-(aq)+ ClO2-(aq) + H2O(l) Experiment 1:
1. 2 answers
2. 3,238 views
HENRY'S LAWI 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
1. 2 answers
2. 1,317 views
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
1. 3 answers
2. 4,141 views
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
1. 4 answers
2. 816 views
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
1. 3 answers
2. 1,857 views
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
1. 3 answers
2. 432 views
Would someone please explain to me what intermolecular forces are. I don't really understand the whole concept.
1. 2 answers
2. 510 views
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
1. 3 answers
2. 956 views
What happens to these physical properties as the strength of intermolecular forces increases?My answers are there as well but
1. 2 answers
2. 3,578 views
What is the solubility of calcium cholride
1. 2 answers
2. 444 views
Write out the Ka and Kb for the biocarbonate ion with chemical equation:Would this be correct: HCO3^-(aq) <--> H+(aq) +
1. 1 answer
2. 923 views
Question..Nicotinic acid (niacin) is a monoprotic acid with the formula HC6H4NO2. A solution that is 0.012M in the nicotinic
1. 1 answer
2. 1,842 views
which countries were part of the triple entente in the first world war one?
1. 1 answer
2. 509 views
1)which shapes are polygons.2)which shapes have atleast one curved side.if you know this please help me as soon as posible
1. 2 answers
2. 279 views
1)which shapes are polygons.2)which shapes have atleast one curved side.if you know this please help me as soon as posible
1. 1 answer
2. 308 views
Hey i have a mid term today at 3 , and this one sample question my prof posted online. If someone can please show me how to get
1. 2 answers
2. 1,075 views
I posted this below and received help but im still lost and worked out the problem but am getting the wring answer:-------------
1. 3 answers
2. 595 views
We actually talked about this before just to remind you im posting the previous post below:_____________________________________
1. 2 answers
2. 587 views
Given the equilibrium constant values:1.N2(g)+ 1/2O2(g)<---> N2O(g) KC=2.7*10^{-18} 2.N2O4(g)<----> 2NO2(g) KC= 4.6*10^{-3} 3.
1. 3 answers
2. 1,429 views
Lead metal is added to 0.140 Cr^3+(aq).Pb(s)+ 2Cr^3(aq)<---> Pb^2+(aq)+2Cr^2+(aq) KC=3.2*10^{-10} A. What is Pb^2+ when
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2. 1,025 views
How would i solve for Y:3.2*10^-10= (y)(2y)^2/ (0.140-2y)^2
1. 3 answers
2. 340 views
Lead metal is added to 0.140 Cr^3+(aq).Pb(s)+ 2Cr^3(aq)<---> Pb^2+(aq)+2Cr^2+(aq) KC=3.2*10^{-10} A. What is Pb^2+ when
1. 2 answers
2. 530 views
A mixture initially contains A,B, and C in the following concentrations: A1 = 0.300 M, B1 = 1.15M, and C1 = 0.350 M. The
1. 2 answers
2. 868 views
Given the two reactions1.PbCl2 <--->Pb^2+ + 2 Cl^-, K1= 1.82×10^−10 2. AgCl <----> Ag^+ + Cl^-, K2 = 1.15×10−4 what is the
1. 6 answers
2. 5,186 views
I have a midterm next week so i just wanted to make sure i understand:When we have a solid in a equation like: A(s)<---> B(g)+
1. 2 answers
2. 455 views
Le Chateleir`s PrinciplePlease check if my answers are right and i dunt know some of them: Consider the following system at
1. 10 answers
2. 7,440 views
The "REVERSIBLE" chemical reaction-A + B <--> C + D Kc = CD / AB =4.4 Concentration at the start and after equilibrium- A = 1.00
1. 2 answers
2. 787 views
I posted this up yesterday:I have to use the equation : density= mass/ volume: But i don't know how to find out the volume using
1. 4 answers
2. 581 views
How would i calculate the density of Li2S in grams per cubic centimeter?I have to use the equation : density= mass/ volume: But
1. 4 answers
2. 3,284 views
How do you find out the coordination number of a crystal?For example im given a picture of the crystal structure of lithium
1. 2 answers
2. 1,332 views
1.SOLUBILITY:At 25C, the molar solubility of calcium phosphate in water is 1.1*10^{-7}M. Calculate the solubility in grams per
1. 4 answers
2. 1,988 views
What mass of ethylene glycol C2H6O2, the main component of antifreeze, must be added to 10.0 L water to produce a solution for
1. 13 answers
2. 6,071 views
What mass of ethylene glycol C2H6O2, the main component of antifreeze, must be added to 10.0 L water to produce a solution for
1. 8 answers
2. 3,778 views
Hi, i actually posted this up before..please double check the answers if i got them right have to hand in on Wednesday:The
1. 5 answers
2. 662 views
Rank these liquids by their expected surface tension.Rank from greatest to least surface tension. 1.CH3CH2OCH3 2.CH3CH2CH2-OH
1. 4 answers
2. 16,688 views
1. The vapor pressure of dichloromethane, CH2Cl2, at 0C is 134mmHg. The normal boiling point of dichloromethane is 40C.
1. 5 answers
2. 1,789 views
The Chemicals are:Baking Soda- NaHC03 Calcium Chloride- CaCl2 Bromothymol Blue - (acid base indicator)
1. 7 answers
2. 2,031 views
1.HOW do you state the amplitude, period, phase shift and vertical shift for the function y= 2sin[4(angle symbol)-pie/2]-5?2.
1. 2 answers
2. 744 views
Molecular Orbitals1.Which of the following diatomic species are paramagnetic and which are diamagnetic? a.C2^2+ b.B2^2- c.Li2^-
1. 1 answer
2. 1,590 views
Suppose that the microwave radiation has a wavelength of 12.4 cm. How many photons are required to heat 255 mL of coffee from
1. 3 answers
2. 1,810 views
Sensory PhysiologyPick two types of sensory receptors: A. Pick two different modalities that would stimulate them B. Put these
1. 1 answer
2. 588 views
Please double check one last time have to hand it in tomorrow.Thank-You in Advance.This was the lab experiment:
1. 3 answers
2. 8,168 views
A 1.082 g sample of a component of the light petroleum distillate called naptha is found to yield 3.317 g CO2 and 1.584 g H2O on
1. 2 answers
2. 571 views
A 2.00 ml sample of an aqueous solution of hydrogen peroxide, H2O2 (aq) is treated with an excess of Kl (aq). The liberated I2
1. 1 answer
2. 706 views