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2004 - Multiple Choice - Q5
Started by rscott, May 23 2006 11:22 AM
4 replies to this topic
#1
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Posted 23 May 2006 - 11:22 AM
Could anyone explain this question to me, because I really don't know how to approach it. I would type it up, but it would take ages!
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#2
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Posted 23 May 2006 - 12:48 PM
You just need to find the mass of each of the atoms.
For example the first one,
H 
O tells us there are 2 hydrogen ions, whose mass each is one, therefore the total mass of the hydrogen ion = 2, there is only one oxygen, and the mass number is 16, therefor total mass of atom= 18
IF go go through this for all of them you should get
1. 18
2. 19
3. 20
4. 20
5. 21
6. 22
From this you can see 3 & 4 are the same, which makes the answer D
Hope this helps
For example the first one,
H O tells us there are 2 hydrogen ions, whose mass each is one, therefore the total mass of the hydrogen ion = 2, there is only one oxygen, and the mass number is 16, therefor total mass of atom= 18IF go go through this for all of them you should get
1. 18
2. 19
3. 20
4. 20
5. 21
6. 22
From this you can see 3 & 4 are the same, which makes the answer D
Hope this helps
*~* Kiss me, beneath the milky twilight, lead me, out on the moonlit floor, lift your open hand, strike up the band and make the fireflies dance, silver moon sparkling, so kiss me *~*
#3
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Posted 23 May 2006 - 03:39 PM
Ah, I get it now! I was getting confused with all the numbers & brackets. Thanks for the help
#4
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Posted 23 May 2006 - 04:06 PM
Yeah there are too many symbols and numbers in it
I had 2 ask my teacher how to do it
Glad it helped you
I had 2 ask my teacher how to do it
Glad it helped you
*~* Kiss me, beneath the milky twilight, lead me, out on the moonlit floor, lift your open hand, strike up the band and make the fireflies dance, silver moon sparkling, so kiss me *~*
#5
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Posted 24 May 2006 - 02:02 PM
yes it is rather confusing!!
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