HS - is amphoteric; it can behave as either an acid or a base.

Prove that HS - is an amphoteric. (You need to write two equations).

We use a kind of plant growth hormone to regular plant growth. We dissolve 5mg of the solution into 2kg of water. What is the dosage of the solution in ppm?

A chemical reaction requires 31.39 kj. how many kilocalories does this correspond to?

How are polyatomic ions similar?

What conditions will cause a redox reaction to be nonspontaneous? O A. The reduced element is higher on the potential list than the oxidized element. O B. The sum of the voltages of the oxidation and reduction half- reactions is negative. O C.

What is the process where a solid changes directly into a gas without first turning into a liquid? A. melting B. sublimation C. evaporation D. condensation

In general, why would a thermometer increase in temperature? What happens with the energy involved?

What is the kinetic energy of the emitted electrons when cesium is exposed to UV rays of frequency 1.6*1015Hz?

For the reaction H2SO4 + 2Na2OH4 - > Na2SO4 + 2H2O If you want to make 5 moles of Na2SO4, how many miles of H2SO4 do you need? A) 5 B) 10 C) 12 D) 2

Which element from the periodic table has four valence electrons

Describe the structure and bonding of a thermosoftening polymer and explain why they melt when heated.