Russell Tio

My Samsung Galaxy S2 (GT-I9100) suddenly couldn't power on last night when it was working perfectly when I last checked it an hour ago. Can't charge the phone or connect to PC via USB. Tried multiple batteries with the phone, they work with friends' phones but not mine. Attempted to hard reset but nothing happens. Left battery out for a day then tried to turn on again.

Brought phone to a Samsung Service Centre and they said they can change the motherboard, but that will wipe the phone data and factory reset. But the only concern I have is to recover the contacts (I didn't backup), SMSes, memos etc, those that are in the phone and not SIM/SD card.

Is there a way to recover or salvage the data in the phone?

FeSO4(aq) + 2NaOH(aq) --> Na2SO4(aq) + Fe(OH)2(s)

When sodium hydroxide solution is added to aqueous iron(II) sulfate, iron(II) hydroxide precipitate is formed.

However, when sodium hydroxide solution is added in excess:

Fe(OH)2(s) + 2NaOH --> Na2FeO2(aq) + 2H2O(l)

The precipitate of iron(II) hydroxide reacts to form soluble sodium zincate, and the solution becomes free of precipitate. Why is this so?

Same for other similar reactions:

ZnCl2(aq) + 2NaOH(aq) --> 2NaCl(aq) + Zn(OH)2(s)

Zn(OH)2(s) + 2 NaOH(aq) --> Na2ZnO2(aq) + 2H2O(l)

FeSO4(aq) + 2NaOH(aq) --> Na2SO4(aq) + Fe(OH)2(s)

When sodium hydroxide solution is added to aqueous iron(II) sulfate, iron(II) hydroxide precipitate is formed.

However, when sodium hydroxide solution is added in excess:

Fe(OH)2(s) + 2NaOH --> Na2FeO2(aq) + 2H2O(l)

The precipitate of iron(II) hydroxide reacts to form soluble sodium zincate, and the solution becomes free of precipitate. Why is this so?

Same for other similar reactions:

ZnCl2(aq) + 2NaOH(aq) --> 2NaCl(aq) + Zn(OH)2(s)

Zn(OH)2(s) + 2 NaOH(aq) --> Na2ZnO2(aq) + 2H2O(l)

What happens when hydrochloric acid is added to water? Why is heat given off?

A man sold x similar books for $132 altogether. If he had sold (x - 1) books but charges $1 more for each book, he would have received the same amount of money. Find the value of x.

Please show your working and please give a reason for each step, if possible.

A man sold x similar books for $132 altogether. If he had sold (x - 1) books but charges $1 more for each book, he would have received the same amount of money. Find the value of x.

Please show your working and please give a reason for each step, if possible.

Adam works part time at a fast food restaurant that pays $x per hour, while Jenny works as a sales assistant in a boutique that pays $(x + 2) per hour. Adam works 8 hours more per week than Jenny and they each earn $192 a week. Find the value of x and the number of hours that Adam works in a week.

Please show workings clearly.

A man sold x similar books for $132. If he had sold (x - 1) books but charges $1 more for each book, he would have received the same amount of money. Find the value of x.

Polystyrene (styrofoam) is a good insulator, but air is an even worse insulator. Why then, do people keep items in polystyrene boxes instead of leaving them exposed to air? How exactly do these insulators like styrofoam work? I would appreciate if you make references to the molecules of the materials.

Polystyrene (styrofoam) is a good insulator, but air is an even worse insulator. Why then, do people keep items in polystyrene boxes instead of leaving them exposed to air? How exactly do these insulators like styrofoam work? I would appreciate if you make references to the molecules of the materials.

Polystyrene (styrofoam) is a good insulator, but air is an even worse insulator. Why then, do people keep items in polystyrene boxes instead of leaving them exposed to air? How exactly do these insulators like styrofoam work? I would appreciate if you make references to the molecules of the materials.

Why, in base pairing, must Adenine go with Thymine and Cytosine with Guanine? Why not A with C or G?

Why does water seem to disappear when ethanol is sprayed onto it? I am referring to the ethanol used in the lab to sterilise equipment.

There were 40% more boys than girls at a gathering. After 24 boys and 24 girls left the gathering, there were 50% more boys than girls. how many boys were there at the gathering at first?

I need not a single answer, but detailed steps and procedure with explanations. The one that I am able to understand gets ten points.

The numerator of a fraction is 5 less than the denominator. If 1 is added to both the numerator and the denominator, the fraction would become 2/3. Find the fraction.

Please include a step-by-step guide with explanations. Thanks.

The numerator of a fraction is 5 less than the denominator. If 1 is added to both the numerator and the denominator, the fraction would become 2/3. Find the fraction.

Please include a step-by-step guide with explanations. Thanks.

What is the function of the tunic of an onion? The tunic is the outer layer of an onion. The "skin" of the onion. What is it's function?

10 points for best answer. Links greatly appreciated.

What is the function of the tunic of an onion? The tunic is the outer layer of an onion. The "skin" of the onion. What is it's function?

10 points for best answer. Links greatly appreciated.

(a/b) / (c/d)

= (a/c) / (b/d)

True or False???