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<TR><TD class=heading>Question: </TD><TD>Which of the following is the correct electron structure for Calcium? I thought the electron Structur was 2,8,10 ?? as the 3rd shell can fit 2(n)^2 = 2x3^2 =18 electrons so why is the answer 2,8,8,2? why does it go to the 4th shell when the 3rd...

which one is good?

Is it Ns2S? not sure?

Anyone else struggling with Microbiology and Physiology? There are so many new terms to learn. And when they are explaining a concept they refer to another bio term to explain the current term. Its like reading in a foreign language. For people who have never done biology in HS, what did u...

<TABLE cellSpacing=0 cellPadding=4 width="95%" bgColor=#9999ff border=3><TBODY><TR><TD class=questbody bgColor=#9999ff colSpan=2><BASEFONT>Based on the solubility rules, which one of the following should be soluble in water? </BASEFONT></TD></TR><TR><TD class=questitem width="5%"...

MC Question How many moles of oxygen are there in 19.71g CO2 ? a 0.493 mol b 0.403 mol c 2.23 mol d 867 mol e 0.896 mol =>12+16*2 = 44g/mol CO2 =>19.7/44 = 0.448mol CO2 This is where i am not sure...

SO3 2- SULFITE ok so Sulfite is correct because S= 4, O3 = -6 so net = -2? is that the logic?

here is a M/C question i got... which of these are incorrect SO3 2- SULFITE HPO4 2- HYDROGEN PHOSPHATE NO2 1- NITRITE MnO4 2- MAGNITE SiO3 2- SILICATE THE ANSWER WAS MAGNITE, HOW DO I KNOW THAT IS NOT MnO4 2- ?? THANKS

can u check my answer to this? Calculate the molarity of a Sodium Hydroxide solution if it required 2.96mL of 0.225M H2S04 to completely react with 2.00ml of the Hydroxide. My answer in 2.96mL 0.225M H2s04 => 0.225mol/1000ml x 2.96mL = 0.00066 mol H2SO4 therefore 0.00066 mole in 2mL of OH...

Aussie Aussie Aussie ....

firslty i know the group 1 and 2 elements are all +1 and +2 respectively. thats easy and Flourine-Iodine are -1 Oxygen-sulfer is -2 Nitrogen to phosphoru is -3 is there a way of working out the ionic charge of elements such as nickel,copper, zinc. i.e the elements in the middle. do you...

thanks buddy

I know for say HCl its H+ + Cl- however given this H2So4 + 2NaOH -> Na2SO4 + 2H20 how do i write the ionic equation for it? 2H+ ... ?? or H2+ ... ?? or H+ + H+ what do we do for the subscript 2 for the H2SO4 and the 2 mole of NaOH

when do you need them?

if the lectures are all on overheads then NO, coz he/she is only going to read straight off the overheads if the lecturer writes on the whiteboard then YES. usually maths subjects i attend as its more HOW to do something. whereas a theory course cant really be taught without the student...

so how is it different to CuSO4 + 5H20 ?

oops 154 is correct

what 3.25M NaOH is needed to prepare 500ml of 1.0molar solution i can do m1v1=m2v2 i get answer 167ml. however can someone explain logically how to figure this problem out without the m1v1=m2v2 formula?

yes its worthless. just feeding the Student Unions ego's

how come it is not written as CuSO4 H10O5 ? 4, 10 and 5 little subscripts