Questions and answers by

Jiskhaa

Questions (21)

If 1 mol L of 2.0 mol L hydrochloric acid is diluted to form a solution with concentration 0.2 mol L,A. What is the final
1. 0 answers
2. 575 views
Find the exact values of sin 2 theta, cos 2 theta and tan 2thea using the double angle formulasin theta = 3/4 , pi/2 < theta <
1. 1 answer
2. 637 views
Discuss the effect of the 'extra' hydroxyl groups on the physical properties of diols and triols, compared to alkanols that have
1. 0 answers
2. 581 views
List commercial, everyday products whose manufacture starts with ethylene or ethene.I have already listed down plastic bags and
1. 1 answer
2. 410 views
If (x-k, where k is integral, is a factor of the polynomial P(X)=2x3-3x2-12x-7, what possible values may k have?Working out
1. 1 answer
2. 481 views
Calculate the molarity of the solutions made by dissolving the following amounts of solute in water and making the volume up to
1. 1 answer
2. 559 views
Find the equation of the locus of the point P(x,y) which moves so that it's distance from the point (0,3) is equal to its
1. 1 answer
2. 513 views
If Q(x)=x^2 for x less than or equal to 1=ax+b for 1<x<2 = x^2-5 for x greater than or equal to 2 Find the values of a,b if Q(x)
1. 1 answer
2. 424 views
X squared-(k+3)x+4k=0Please help me find the value of k for which there are equal roots but of opposite sign Working out please
1. 1 answer
2. 507 views
M squared is greater than or equal to 36How to find m I only have one set of answers for m and that is m is greater than or
1. 1 answer
2. 927 views
45% is 28100%=? Please show me the concept and the working out as well please
1. 1 answer
2. 379 views
An impure sample of substance X melts at about 113 degress. Which of the substances could be X and state yResorcinal 111 degrees
1. 1 answer
2. 595 views
Which of the following metals would be expected to have the most unstable salts?a) sodium b) zinc c) tin d) silver Please define
1. 1 answer
2. 475 views
If tan theta= 1/5Simplify tan(540-theta) In the unit circle do I have to go clockwise or anti-clockwise from the fourth
1. 1 answer
2. 1,472 views
During the phase of condenstion, is heat being absorbed from surroundings or released into surroundings! I think it is being
1. 1 answer
2. 513 views
Why are the united nations headquarters in New York City?
1. 1 answer
2. 503 views
The value of a certain fraction becomes 1/5 if one is added to its numerator. If one is taken from its denominator, its value
1. 1 answer
2. 1,365 views
A closed rectangular wooden box has external dimensions 17x12x10. If the wood is 1cm thick, calculate the volume of wood
1. 1 answer
2. 628 views
A rectangualr metal sheet is 32m long, 16m wide and 12mm thick.Eight circular holes, each of diameter 3m are cut in the sheet,
1. 1 answer
2. 586 views
The earth is approximately a sphere of average diameter 12740km.The smallest of the planets is Mercury, also spherical, with
1. 1 answer
2. 671 views
Calculate the number of litres of water delivered per minute by a pipe with cross-sectional area 15 square centimetres, if the
1. 1 answer
2. 492 views