ADA Practice Test Gen Chem

[sexysummer]

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Please help with this one

 

[Lnguyen7]

Remember these rules
1. The size of atom increases as you go from right to left and top to bottom of a periodic table.
2. To compare between cation, anion and neutral atoms: A2+ < A+ < A < A- < A--. This comparison, however, is only meaningful when comparing between isoelectronic species.

Using first rule, Mg is the largest.

 

[sexysummer]

Remember these rules
1. The size of atom increases as you go from right to left and top to bottom of a periodic table.
2. To compare between cation, anion and neutral atoms: A2+ < A+ < A < A- < A--. This comparison, however, is only meaningful when comparing between isoelectronic species.

Using first rule, Mg is the largest.

Thanks,
Here is the second question
see above

 

[sexysummer]

Remember these rules
1. The size of atom increases as you go from right to left and top to bottom of a periodic table.
2. To compare between cation, anion and neutral atoms: A2+ < A+ < A < A- < A--. This comparison, however, is only meaningful when comparing between isoelectronic species.

Using first rule, Mg is the largest.

I have a another o chem question


see image

what are they saying

 

[Lnguyen7]

Basically they want to know what n represents. Here n is the number of bonds connected to the heteroatom.

 

[Denevistas]

where can i get these questions???

 

[danchoi03]

I would ignore # 99 and #100 on ADA 2009 OC. These problems are rarely on the real DAT. It is more important that you understand all the fundamentals that are taught by Chad.

 

[paragon1111]

the answer to your first order question is E. This can be elucidated from the formula (original) * (1/2)^n where = number of half lives. In this case, we have 5 half lives (50 min total/10 min half lives=5 half lives0. we have 1 Mol of A as a beginning concentration. Plug and pray 🙂