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Fiona

Questions and answers by Fiona

Questions (96)

John leaves point A to travel 360klm and Joanne leaves point A 40 mins later and her cars speed is 18klm per hour faster than
1. 1 answer
2. 488 views
For this problem, will someone please check my answer?How many grams of oxygen are produced in the decomposition of 5.00g of
1. 1 answer
2. 594 views
Given four unlabeled compounds and four labels (potassium sulfate, potassium carbonate, chromium sulfate, and cobalt bromide) is
1. 1 answer
2. 617 views
If barium nitrate solution is added to sodium hydroxide solution does a precipitate form? Are there exceptions?I have an
1. 1 answer
2. 1,033 views
I have an assigment question that I need help with.The Q states that sodium hydroxide absorbs water from the atmosphere. Then
1. 1 answer
2. 695 views
I know that 10^-2.3=5.0 * 10^-3How do I get 10^-2.6 in the same form as 5.0 * 10^-3? please and thank you! Punch in 10 on your
1. 1 answer
2. 877 views
In the reaction2H20(aq) --> O2(g) + 2H20(l) why doesn't increasing the pressure of oxygen have any effect on the reaction rate?
1. 1 answer
2. 428 views
does log base of 4 sqrt(t/s)=1/2log base of 4 t - 1/2log base of 4s?sqrt=square root thanks yes yah thanks!
1. 1 answer
2. 361 views
I have two substances potassium sulfate and potassium carbonate. They are unlabelled and I need to know which one is which. If I
1. 1 answer
2. 472 views
sorry to annoy anyone, but WHAT is the big idea of energy? i would really appreiciate a responseIn what context? Too much use.
1. 6 answers
2. 633 views
for the reaction4NH3(g) + 5O2(g) <--> 4NO(g) + 6H2O(g) if H = -950kJmol-1, does that mean it's an exothermic reaction? Ooops
1. 4 answers
2. 3,775 views
Which of the following reactions is exothermic?1. Na(s) --> Na(g) 2. Na(g) --> Na+ + e- 3. Cl2(g) --> 2Cl(g) 4. Cl(g) + e- -->
1. 3 answers
2. 3,745 views
If the oxygen being fed into the system4NH3(g) + 5O2(g) <--> 4NO(g) + 6H20(g) + 950kJmol-1 is heated, how will the equilibrium
1. 1 answer
2. 592 views
1. What will happen if I add water to a FeSCN+2 solution?FeSCN+2(aq) + H2O(l) <--> ???? 2. Will the equilibrium shift to the
1. 1 answer
2. 1,065 views
I think I made a mistake with my previous question. I have two solutionspotassium thiocyanate (KSCN) and iron (III) chloride
1. 1 answer
2. 663 views
When asked to name all of the ions and molecules present in a 0.1 mol L-1 solution of CH3COOH, why are there OH- ions present if
1. 1 answer
2. 547 views
When we mix NaOH and H2SO4 we get the equationOH-(aq) + H+(aq) --> H2O(l) and if we mix H2CO3 and NaOH we get the equation
1. 1 answer
2. 754 views
Why is a solution of KNO3 neutral and not acidic?K^+ doesn't hydrolyze (H2O has a stronger attraction for the OH- than K^+) and
1. 1 answer
2. 832 views
I have an assignment QA 0.1 mol L-1 water solution of NH4CH3CO2 has a pH of approx 7. Explain this using two equations. I have
1. 1 answer
2. 1,135 views
How does one calculate the pH of a solution that is only 1.84% ionised?determine the concentration of the H+, which will be in a
1. 1 answer
2. 403 views
If the hydrochloric acid is warm, is the following equation correct?2HCl(aq) + Na2SO3 --> 2NaCl(aq) + SO2(g) + H2O(l) yes,
1. 1 answer
2. 355 views
If a solution of Ca(OH)2 has a pH of 12.31 how can I calculate the concentration of calcium hydroxide in mol L-1 ?Write the
1. 3 answers
2. 883 views
What sort of chemical test can be performed to identify from two unlabelled powders which one is zinc hydroxide and which one is
1. 1 answer
2. 379 views
I'm trying to work out the equation for when ammonia solution is added to zinc hydroxide solution. I think a precipitate forms.[
1. 1 answer
2. 1,008 views
Does the reaction betweenCO2(g) + Mg(OH)2(aq) produce MgCO3(s) + H2O(l) or Mg(HCO3)2 ??? Normally, Mg(CO3)2 but I suspect an
1. 1 answer
2. 734 views
If a colourless liquid with a pungent odour is added slowly to another colourless liquid, a dark brown precipitate is produced
1. 1 answer
2. 1,206 views
Does sodium metal react with potassium hydroxide solution?No. It would be a displacement reaction and this only works if the
1. 2 answers
2. 577 views
Electrochemical CellsOut of platinum, iron, carbon and silver which would be the LEAST suitable as an electrode in a standard
1. 1 answer
2. 447 views
Do you know the carbon chain lengths for the different states of alkynes?Eg alkanes having a carbon chain length of 1-4 are
1. 1 answer
2. 444 views
What is the suffix for an alcohol which contains more than three -OH groups?
1. 1 answer
2. 368 views
Where did Cleopatra die?Thanks much!
1. 3 answers
2. 411 views
In the poem "Parade" by Rachel Field, what details in the poem describe the town? The only thing I see is the elm trees and the
1. 3 answers
2. 595 views
I'm not sure how to quote a dialogue from a play in my essay.And if it includes a line such as: WALTER(With immense passion)
1. 5 answers
2. 554 views
Help please!What is the domain and range for the following numbers 2.68, 2.58, 2.38? Thank you
1. 3 answers
2. 467 views
A 190 g particle is released from rest at point A inside a smooth hemispherical bowl of radius 25.0 cm.Calculate the
1. 3 answers
2. 758 views
Why do eskimos wash their clothes out tide? (can only be 10 letters)
1. 3 answers
2. 457 views
If 2 g of salicylic acid is heated with 4 g of acetic anhydride, what is the theoretical yield ?C7H6O3 + C4H6O3 --> C9H8O4 +
1. 2 answers
2. 857 views
Find the probability of at least 3 successes and at least 2 failures. N(trials)=10 and p=3/10
1. 1 answer
2. 648 views
a hedgehog wishes to cross a road without being run over. he observes the angle of elevation of a lamp post on the other side of
1. 4 answers
2. 5,958 views
Name one difference between acids and bases in terms of:-Their chemical formula -A property Any help would be awesome.
1. 1 answer
2. 464 views
I have a couple of questions I need a hand with:1. Oxygen has a melting point of -218 degrees celcius and a boiling point of
1. 5 answers
2. 1,006 views
1)How much work is done by a person lifting a 2 kg object from the bottom of a well at a constant speed of 2m/s for 5 s. Is the
1. 4 answers
2. 1,563 views
How do you go about finding equations to a given solution set?
1. 1 answer
2. 315 views
in the reaction of aluminium and iron (III) oxide to form iron and aluminium oxide, H-850 kJ. how many grams of aluminium oxide
1. 4 answers
2. 1,704 views
Runner A is initially 2.4 km west of a flagpole and is running with a constant velocity of 8.4 km/h due east. Runner B is
1. 2 answers
2. 575 views
Runner A is initially 2.4 km west of a flagpole and is running with a constant velocity of 8.4 km/h due east. Runner B is
1. 2 answers
2. 577 views
Write this equation as a logarithm of a power:w ln 4
1. 1 answer
2. 361 views
A 540 g block is released from rest at height h0 above a vertical spring with spring constant k = 320 N/m and negligible mass.
1. 1 answer
2. 838 views
A 540 g block is released from rest at height h0 above a vertical spring with spring constant k = 320 N/m and negligible mass.
1. 4 answers
2. 1,399 views
Hello! I need help with these four math problems. Thanks so much! :)1.) ƒ(x) = (x^4)/4 − 3x^3 + (23x^2)/2 - 15x. Find the x
1. 3 answers
2. 683 views
Re-write the sentences in Spanish.Are my answers correct? Thanks! :) 1.) I used to eat. 2.) Clean!! 3.) You (informal) have seen
1. 6 answers
2. 645 views
How do you solve this? Thanks!y+3 = -2(x+1)
1. 1 answer
2. 324 views
Okay, so! I figured out how to get the Point-slope form to the question I was given which led me to y+3 =-2(x+1), but, now I'm
1. 4 answers
2. 464 views
1.) Which of the following inequalities is true for all real values of x?a.) x^3≥^2 b.) 4x^2≥2x^2 c.) (3x)^2≥4x^2 d.)
1. 3 answers
2. 1,295 views
A car skids to a stop at a traffic light, leaving behind a 8.25m skid mark as it comes to a rest. Assuming that the car is
1. 2 answers
2. 500 views
Condense the expression to the logarithm of a single quantity.5lnx-6ln(x+2)
1. 2 answers
2. 536 views
The ionic equation and net ionic equation and balance equation:A) Ca(OH)2 + HNO3 --> B) H2SO4 + Na2CO3 --->
1. 3 answers
2. 1,982 views
A person weighs 150 N on the moon. If the acceleration due to gravity on the moon is 1.63 m/s2, what is the mass of the person?
1. 5 answers
2. 1,416 views
Find all the solutions of the equation in the interval {o,2pi)5sqrt3 tan x+3=8sqrt3 tan x
1. 4 answers
2. 1,415 views
The heat of solution of potassium acetate (KC2H3O2) in water is -15.3 kJ/mol.If 18.8 g of KC2H3O2(s) is dissolved in 655 mL of
1. 5 answers
2. 4,433 views
Find the height of the tower to the nearest tenth of a meter. the dimensions are 58 degrees and 36m. [its a right angle
1. 2 answers
2. 626 views
Find a pair of positive integers such that the sum of the numbers is 20 and the sum of their reciprocals is 4/15.
1. 1 answer
2. 416 views
The sum of two numbers is 63. One number is 7 more than the other. Find the numbers.
1. 2 answers
2. 536 views
Find two numbers for which the sum is 51 and the difference is 13.
1. 1 answer
2. 397 views
The equilibrium constant is equal to 5.00 at 1300K for the reaction2SO2(g) + O2(g) <--> 2SO3(g) if initial concentrations are
1. 4 answers
2. 8,054 views
African slaughter rituals should be allowed in the suburbs
1. 4 answers
2. 513 views
How many ways are there to select a group of five from 6 males and 6 femalesa) with no restrictions b) if the group must contain
1. 4 answers
2. 342 views
This is not school related, but it is Jiskha related. If you get banned for Jiskha, is there any way to get in-banned. I have
1. 10 answers
2. 509 views
Okay, so I don’t know why but I’m banned again. I was just trying to answer a question yesterday and it said in red you are
1. 10 answers
2. 513 views
Twice the square of a certain whole number added to 3 times the number makes 90 find the number
1. 1 answer
2. 95 views
How can one effectively handle situations where their nickname is being used by someone else?
1. 1 answer
2. 63 views
Is there a reliable method to find new friends who are willing to play and share with me?
1. 1 answer
2. 55 views
Breast Cancer
1. 2 answers
2. 65 views
why don't i hear audio on another tab while screen recording? When I was screen recording a voice spinner, I do not hear audio.
1. 2 answers
2. 102 views
Points M, N, and O are the midpoints of sides KL, LJ, and JK, respectively, of triangle JKL. Points P, Q, and R are the
1. 1 answer
2. 27 views
There is a group of five children, where two of the children are twins. In how many ways can I distribute $3$ identical pieces
1. 1 answer
2. 15 views
In how many ways can three pairs of siblings from different families be seated in two rows of three chairs, if siblings may not
1. 1 answer
2. 11 views
I was going over some notes and I noticed a pretty big dilemma talking about types of tables and graphs. I was wondering what
1. 1 answer
2. 14 views
A standard deck of cards contains 52 cards. These 52 cards are arranged in a circle, at random. Find the expected number of
1. 1 answer
2. 27 views
Let a, b, c, be the numbers 1, 2, 3, in some order. Find the largest possible value of a + 2b + 3c.
1. 1 answer
2. 22 views
Find the number of ways that Magnus can give out 12 identical stickers to 4 of his friends. (Not everyone has to get a sticker.)
1. 1 answer
2. 20 views
Points A , B, and C are drawn, with the following:AB = 6 AC = 16 BC = 10 Point B is on AC Semicircles are constructed on AB, AC,
1. 1 answer
2. 9 views
Find all points $(x,y)$ that are $5$ units away from the point $(2,7)$ and that lie on the line $y = 5x - 28.$
1. 1 answer
2. 11 views
There is a group of five children, where two of the children are twins. In how many ways can I distribute 8 identical pieces of
1. 1 answer
2. 11 views
In how many ways can you distribute 8 indistinguishable balls among 5 distinguishable boxes, if at least one of the boxes must
1. 1 answer
2. 11 views
If f(x) = x^2 - 4 for x >= -4 and x + 3 otherwise, then for how many values of x is f(f(x)) = 5?
1. 1 answer
2. 10 views
In how many ways can you distribute 8 indistinguishable balls among 5 distinguishable boxes, if at least one of the boxes must
1. 1 answer
2. 10 views
Find the largest prime factor of 1,005,010,010,005,001. (Without a computer of course).
1. 1 answer
2. 13 views
Aishah poured 17 litres of water into 3 containers. Container A had 3 times as much water as Container B. Container C had 2.5
1. 1 answer
2. 18 views
Pearl writes down seven consecutive integers, and adds them up. The sum of the integers is equal to 28/5 times the largest of
1. 1 answer
2. 11 views
We introduced i as a square root of -1. Does i itself have any square roots among the complex numbers? If so, name one. If not,
1. 1 answer
2. 10 views
The sequence a(n) satisfies a(1) = 3 anda(n) = [a(n-1)-1]/a(n-1)+1 for all n ≥ 2. Find a(100).
1. 1 answer
2. 10 views
What is the value of $(a+b)\sqrt{cd}$ if $a = 2$ , $b = 4$, $c = 3$, and $d = 12$?
1. 1 answer
2. 9 views
One of the roots of 2x^3 − 9x^2 + 13x + k = 0 is x = 2. Find the other two roots.
1. 1 answer
2. 8 views
If y = (x + 1)/(x^2 + 1), and x is any real number, then what is the sum of the maximum and minimum possible values of y?
1. 3 answers
2. 15 views
We have the lines y=3x and y=2x. Let y=mx be the angle bisector of these two lines. How can I find "m"?
1. 1 answer
2. 10 views

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