A group of students added an excess of finely divided zinc metal to aqueous sulphuric acid. When no more gas was evolved, they filtered the mixture and used the filtrate to obtain dry crystals of hydrated zinc sulphate. (a) Write a balanced chemical equation for the reaction between zinc and
aqueous sulphuric acid. Include state symbols.

7. what temperature is need to just dissolve 50 g of nh4cl in 75 g of water? '

The characteristics of two different types of reactions are shown below: reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of an element. which statement is true about the atoms of the elements that participate in the two reactions? their identity changes in both reaction a and reaction b. their identity changes in reaction a but not in reaction b. their identity changes in reaction b but not in reaction a. their identity remains the same in both reaction a and reaction b.

This statement about matter and its behavior is best classified as a