Goodbye, Or Increased Inactivity???

This topic contains 119 replies, has 22 voices, and was last updated by Trevish 8 years, 6 months ago.

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July 14, 2015 at 10:39 am #114860 Score: 0

Anonymous

Another Stress Bump -.-

July 14, 2015 at 10:40 am #114861 Score: 0

Anonymous

Very interesting timetable…

July 14, 2015 at 1:19 pm #114866 Score: 0

DragonEngineer
Participant

Mole Concept Map for Chemistry.

How it works:
If you are given Mass and you want to find number of particles, take it as a game of maze. How are you going to move from mass to number of particles? As you move from 1 box to another box, do something stated at the arrows

For example:
Mass (g)
|
| x Molar Mass, aka Relative Molecular, Atomic or Formula Mass
|
\/
Number of moles (mol)
|
| x (6 x 10^23)
|
\/
Number of particles (1 particle can be 1 molecule, 1 electron, 1 ion, 1 proton etc)

Always work around with moles.
If you are given mass of known substance, find its Relative Molecular Mass and you can find moles.
If you are given concentration (mol/dm^3) and volume (solvent, such as water), you can find the number of moles.
If you are given amount of heat given out and the enthalpy change of combustion (KJ/mol), you can find number of moles as well.

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Excel in Chemical Calculation now

July 14, 2015 at 1:20 pm #114867 Score: 0

DragonEngineer
Participant

Need help with Physics and Chemistry feel free to ask for notes 😀

July 14, 2015 at 1:35 pm #114868 Score: 0

takoballball
Participant

I likeee potaaatooo

July 14, 2015 at 1:45 pm #114869 Score: 0

Anonymous

…

July 14, 2015 at 1:47 pm #114870 Score: 0
Trevish
Blocked
No one can help me with Computer Science?
I dont have enough notes nor a reference book and i dont take tuition
I need NOTES
Syllabus of CIE:2210Y
IGCSE
- This reply was modified 8 years, 9 months ago by Trevish.
July 14, 2015 at 3:02 pm #114874 Score: 0

DragonEngineer
Participant

Which part of computer science?

Logics?
Binary, Hexadecimal, Decimal?
Computing Maths?

July 14, 2015 at 3:39 pm #114879 Score: 0
Trevish
Blocked
Programming
Logic gates i know for :And Or Not
Only
- This reply was modified 8 years, 9 months ago by Trevish.
July 14, 2015 at 3:42 pm #114881 Score: 0

Trevish
Blocked

If it’s possible
Share with me a website where i can learn computer science and where i can get notes to create my own revision Notes

PS:Before i was doing computer studies and syllabus changed last year to computer science…I am the first one to take part in comp science IGCSE exams

July 14, 2015 at 5:56 pm #114889 Score: 0

Trevish
Blocked

BUMP!

July 14, 2015 at 8:59 pm #114898 Score: 0

Palace_Destroyer (ethanowens,Zegrilo,miniwolverineX)
Participant

i nid hilp with binari :i

(I need help with binary :D)

July 15, 2015 at 6:44 am #114972 Score: 0

Trevish
Blocked

Binary is easy.
Denary to Binary
Eg:200
Step 1:Remember the powers of 2[You will need up to 128 now since 200 is less than 256 and above)
2^8 2^7 2^6 2^5 2^4 2^3 2^2 2^1 2^0
256 128 64 32 16 8 4 2 1

PS:The number in the brackets will represent the binary number

Step 2:Now you make 200 minus(-) the number which is less than it
200-128=72,take the remainder and – the next number below it(1)
72-64=8.(1)
Since 8 cannot – 32,the binary become (0)
You move to next but here too,8 cannot – 16,the binary once again become (0)
8 can – 8;Thus 8-8=0 (1)
Then for the rest the binary becomes (0) because 0 cannot – 4,2,1
Then for each of them the binary is 0

The answer is therefore: 11001000 <-Denary to binary

Under the table it will be like this:

128 64 32 16 8 4 2 1
1 1 0 0 1 0 0 0

=> 1100100

July 15, 2015 at 1:15 pm #114986 Score: 0

Anonymous

Lol, direct conversion is prone to mistakes, what i usually do is to convert to Hexadecimal first which makes the numbers small enough to work with, and then convert from hexadecimal to binary which is much easier, because 2^4=16

Decimal = Hexadecimal = Binary

0 = 0 = 0000

1 = 1 = 0001

2 = 2 = 0010

3 = 3 = 0011

4 = 4 = 0100

5 = 5 = 0101

6 = 6 = 0110

7 = 7 = 0111

8 = 8 = 1000

9 = 9 = 1001

10 = a = 1010

11 = b = 1011

12 = c = 1100

13 = d = 1101

14 = e = 1110

15 = f = 1111

All these can be easily derived and memorised, i got this in my head because of DV Values in Pokemon Gold (played in AGDQ 2013 and SDGQ 2014…)

July 15, 2015 at 3:25 pm #114992 Score: 0

DragonEngineer
Participant

Thanks for taking over my consultation. BTW for hexadecimals, the letters (A to F) should be capital letter.

Logic Gate
AND: Output is true when both inputs are true
OR: Output is true when one of the inputs is true
NOT: invert the input

NAND: Output is false when both inputs are true (AND followed by NOT)
NOR: Output is false when one of the inputs is true (OR followed by NOT)

XOR: Output is true when the inputs have different truth value
XNOR: Output is true when the inputs have the same truth value

Here is the logic gates for IMPLIES gate
T implies T is T
T implies F is F
F implies T is T
F implies F is T

BTW
Guess what is this planet?

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