HELP, 30 Points !!

1. Approximately what is the minimum temperature needed to dissolve 10 g of KNO₃ in 100 g H₂O? Round your answer to the nearest whole number.

2. Imagine that you have 100 g of water.

You start dissolving KNO₃ in the water and you find that after you’ve dissolved about 55 g of KNO₃, you can’t dissolve any more; it just sinks to the bottom.

Approximately what is the temperature of the water?Round your answer to the nearest whole number.

In the following redox reaction which is the oxidizing agent and which is the reducing agent? alcl3 + na nacl + al

Schrodinger and heisenberg developed an alternate theory about atomic nature that contradicted some of bohr's model of the atom. how do changes resulting from new technology and evidence affect the reputation of the atomic theory?

Modern pennies are composed of zinc coated with copper. a student determines the mass of a penny to be 2.482 g and then makes several scratches in the copper coaling (to expose the underlying zinc). the student puts the scratched penny in hydrochloric acid, where the following reaction occurs between the zinc and the hcl (the copper remains undissolved): zn(s) + 2 hcl(aq) → h2(g) + zncl(aq)the student collects the hydrogen produced over water at 25 °c. the collected gas occupies a volume of 0.899 l at a total pressure of 79 j mmhg. calculate the percent zinc (by mass) in the penny. (assume that all the zn in the penny dissolves.)