Biology; Chemistry; Physics: Post your doubts here!

[Tharindu]

actually, the volume of alkali needed to neutralise an acid is the point where an acid (H+ ion) is in excess to when an alkali (OH- ion) is in excess. It is actually very difficult to exactly pour out the same number of OH- ions as there are H+ ions, so the little excess of OH- ions results in alkaline solution.

Y are u in tension about this? just make sure u know the colour change!

Thanks man...u have always been helpful

 

[ashiqbal]

Right back at you, anyone could get confused by "dominant homozygous or heterozygous or dominant characteristic is
homozygous?" Doesn't seem a question nor does it look like an answer

look duke: the thing is that they have asked what percent of the recessive phenotype is homozygous?
total number of recessive phenotype = 1 (aa)
number of recessive that are homozygous = 1(aa)
probability = 1/1 = 1

okay, take it another way.
If it had asked for dominant than would your answer be 1 (3/3) or 0.75?

for this, make the calculations again
total number of dominant = 3 (AA, Aa, Aa)
number of dominant that are homozygous = 1 (AA)
probability = 1/3 = 0.667

got it now????

 

[ashiqbal]

Thanks man...u have always been helpful

oh stop it u!

 

[Tharindu]

Name a compound that will react with zinc oxide to make zinc nitrate ???

 

[ashiqbal]

Name a compound that will react with zinc oxide to make zinc nitrate ???

HNO3! Zinc oxide is amphoteric. nitric acid will neutralize it!

 

[asd]

umm so the homozygous one is clear or still confusion ?

 

[Tharindu]

HNO3! Zinc oxide is amphoteric. nitric acid will neutralize it!

Y is neutralization important here??

 

[asd]

Zinc oxide can show both, acid characteristics and as well as basic. Here, the reactant is an acid, so zinc oxide will neutralise it by acting as a base. If the reactant was a base, it would act as an acid..

 

[asd]

look duke: the thing is that they have asked what percent of the recessive phenotype is homozygous?
total number of recessive phenotype = 1 (aa)
number of recessive that are homozygous = 1(aa)
probability = 1/1 = 1



for this, make the calculations again
total number of dominant = 3 (AA, Aa, Aa)
number of dominant that are homozygous = 1 (AA)
probability = 1/3 = 0.667

got it now????

0.667 ?
Is that for dominant phenotypes ?

 

[ashiqbal]

0.667 ?
Is that for dominant phenotypes ?

nopes. for dominant being homozygous!

 

[asd]

Y is neutralization important here??

2HNO3 + ZnO ---> Zn(NO3)2 + H2O

 

[asd]

nopes. for dominant being homozygous!

Oh, K

 

[Tharindu]

Is aqueous ammonia harmful???

 

[asd]

Is aqueous ammonia harmful???

It's not toxic usually, nor flammable.
While ammonia gas has a pungent smell and irritates when we inhale.

 

[haha101]

Guys Chem Atp is just around the corner ! Any "Mushkil Sawals ?"

 

[haha101]

Are flame tests included in our syllabus ?

 

[asd]

No

 

[haha101]

Is it just me Or do all of you think that whenever volume of a gas syringe is asked in chem it is 72 cm3

 

[asd]

Never noticed ..

 

[Rimsa]

Is it just me Or do all of you think that whenever volume of a gas syringe is asked in chem it is 72 cm3

just you =P