Saturday

February 25, 2017
Total # Posts: 27

**Chemistry**

1. When 20cm^3 of a gaseous Allene burns in an excess of oxygen, 60cm^3 of carbon dioxide are formed. Both volumes are measures at r.t.p. What is the formula of alkene? Is it C3H6 or C6H12 and why? 2. A student investigate the reaction of vegetable oil with hydrogen. 100cm^3 ...

*November 13, 2011*

**Chemistry**

1. What does 'the time taken to reach completion decreases if 20cm^3 of hcl containing 4mol/dm^3' means? How to work out to find the concentration? 2(a)What does concentrated hcl means? (b)What does dilute hcl means? Which will react faster or slower / a or b? Thanks ...

*October 30, 2011*

**Maths**

The braking distance of a car is directly proportional to te square of it's speed. When the speed is p metres per second, the braking distance is 6m. When the speed is increased by 300%, find (a) an expression for speed of the car (b) the braking distance (c) the % ...

*October 21, 2011*

**Math**

Banana bought 3 companies for A :$20000000 B : $250000000 G : $350000000 He made a profit of $(9.6x10^6) when he sold the companies. He also made a profit of 25% on A and loss of 10% on B. Find the percentage profit he made on G. How do I do this? What are the fixed...

*October 21, 2011*

**Math**

Why 72 + 2x = 11x ? Would you be able to list some of the common sentences for forming this type of equations? Thanks!! :)))

*October 15, 2011*

**Math**

Thanks!!! :) is there any shorter ways? :)))

*October 15, 2011*

**Math**

A piece of rope is cut into three pieces in the ratio 2:7:11. If the longest piece is 72cm longer than the shortest piece, find the length of the original rope. Ps: how do I do this type of question? What are the fixed steps?

*October 15, 2011*

**Chemistry**

Why during melting, particles gain energy and vibrate more, until they are able to overcome the forces that hold them in their fixed position? Why during boiling, particles gain kinetic energy and move quickly until they can completely break the forced holding them together? ...

*September 9, 2011*

**General question**

Alright and thanks!

*September 8, 2011*

**General question**

Hi. Is there any ways that I can post the questions up here using pictures? As some of the questions requires diagrams to be solved. Thanks a lot.

*September 8, 2011*

**Chemistry**

Aqueous potassium sulfate can be prepared by titrating dilute sulfuric acid against aqueous potassium carbonate. What conclusion can e drawn from here? And explain why is it so.

*September 7, 2011*

**Math**

Apples are sold in cartons of 25. David bought home 2 cartons an found 3 rotten apples in the first carton. There were thrice as many rotten apples in the second carton. 1. Find the probability of randomly selecting a good apple from carton 2. 2. If 2 apples are randomly ...

*September 7, 2011*

**Math**

What?!

*September 7, 2011*

**Math**

Machine A pack = 7200/p boxes of cookies Machine B pack = 7200/p+2.60 boxes of cookies Machine A can pack 1560 more boxes of cookies thanks machine B. Form an equation which reduces to 1560p^2 + 4056p - 18720 = 0 and explain why is this equation is true.

*September 7, 2011*

**Chemistry**

Calcium carbonate is insoluble in water. Name two substances that when mixed in solution, will form a precipitate of calcium carbonate. Explain why is it the two substances that you have chosen. why does magnesium chloride cannot be prepared in the lab by the reaction of...

*September 6, 2011*

**Algebra**

Factorise 4ysquare +24y+36

*August 26, 2011*

**Math**

THANKS ! :D

*August 10, 2011*

**Math**

Number of goals : 0, 1,2,3,4,5 Number of matches : 7,x,5,3,1,4 (a) if the mean number is more than 2, find the largest possible value of x. (b) if the median number of goals is 2, find the largest possible value of x

*August 10, 2011*

**Math**

m is inversely proportional to n^2, where m and n are positive numbers. If m is increased by 1500% , find the percentage change in n. THANKS.

*August 9, 2011*

**Math**

(i) Solve the equation 3y^2-5y-2=0 (ii) hence, solve the equation, 3(1/x-1)^2 -5(1/x-1)-2=0

*August 8, 2011*

**Math**

S is directly proportional to M^3. It is given that S=36 for a certain value of M. Find the value of S when this value of M is (a) doubled (b) reduced by 40%

*August 7, 2011*

**Math**

Yes!! Aww thanks!! Sorry for the confusion I've made. Yes it's 3Y

*August 5, 2011*

**Math**

Oops! Sorry! 3G I mean.. Thanks!

*August 5, 2011*

**Math**

Given 4w = 5x and 2x = 3G , find the ratio w:x:y

*August 5, 2011*

**Math**

What is the smallest positive integer value n, for which 2700n is a multiple of 35?

*August 5, 2011*

**Math**

How do I get 13:36 ?

*July 13, 2011*

**Math**

Mr smith flight took off at Vancouver at local time 1335. The flight was bounded for Sydney via hongkong. After 16.5h flight, mr smith reached hongkong at 1505 local time on the same day. The plane took off again after 2h 20min. The plane landed in sydney at local time 0245 ...

*July 13, 2011*

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