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Questions (10)
3ca(s) + 2H3PO4(aq) -> Ca3(PO4)2(aq)+3H2(g)
1)a reaction between calcium and a solution of 1.2moldm-3 phosphoric acid produced 3
2 answers
894 views
The following questions are about the reaction of sodium oxide with nitric acid.
1)What mass of sodium oxide would be needed to
5 answers
633 views
How may particles are there in:
in 1 mole of silicon? in 2 moles of fluorine? in 31g phosphorous? in 18g water? please help im
6 answers
383 views
In 1346 the army of King Edward III of England defeated the forces of King Phillip VI of France at the battle of Crecy.The
4 answers
1,119 views
One device used for throwing spears is an atlatl. This device was used by human hunters over 20000 years before the invention of
1 answer
438 views
A golf ball is stuck at point o on the ground and moves with an initial velocity of 20ms-1 at an angle of 53 degrees to the
3 answers
1,730 views
1) A golf ball is hit from a position that is 4m higher than h ehorizintal area where the ball lands. The intiial velocity of he
2 answers
585 views
1)A ball is thrown so that it initially travels at 10ms-1 at an angle of 70 above the horizontal
a)a simple model assumes that
4 answers
1,758 views
A ball is kicked from ground level so thta is intiial velocityis 10ms-1 AT AN angleof 60 degrees above the horizontal. It hits a
2 answers
745 views
An arrow is fired horizontally with a speed of 30ms-1 from a height of 2m above the ground level. Model the arrow as a particle
4 answers
2,355 views
Answers (15)
Please help im sure i did it all wrong
I thought the last two were different I got for 31g phosphorous: 5.149501661 X 10-23 for 18g water: 2.990033223 X 10-23 Scott I dont get what you meant by your last two answers
is the last one 0.0416
Forgot to post the other question for thisequation: 2) 2.00g of calcium was added to 500cm3 of 0.1moldm-3 and the solution was left until all the effervescence had stopped. a) What volume of 2 moldm-3 NaOH solution would be needed to neutralise th
My teacher put in Ar=121.8 so we would know the ar to use if for the question if that helps yuo answer the question so you can hopefully help me
IM VERY STUCK ON C
DrBob222 please help with a i dont know what to do or what it is and for c that was what the question said and I'm still confused please tell me the steps specific to this.
I dont get it the total is 160 and there are2 numbers so 2 fractions? and I dont get the x thing with 1-x AND 79(X)+81(1-X) iM VERY CONFUSED PLEASE HELP
Thanks for your help so far but I dont know what to write for these questions Drbob222 I only know how to answer clear questions saying "what is the configuration" so please help.
Please help with this question I still need help specific to this question
With that last line what is that equation and what is it used for?
When it says "HOW MUCH?" is it talking about the mass or the moles? If its talking about the moles is the answer 3 moles?
I'm confused with the working out could you make it clearer please
Where did you get 22,400 from wouldnt you divide by 24000
DrBob222 I thought that 24,000 was for cm3 not dm3
