3 Name the changes of state taking place at A and B in Figure 1.

Use words from the box.
[2 marks]
boiling
condensing
freezing
melting
Change of state at A:
Change of state at B:

Given sno2 + 2h2 - sn + 2h20 tin oxide reacts with hydrogen to produce tin and water. how many moles of sno2 are needed to produce 500.0 grams of sn?

An alkaline battery produces electrical energy according to the following equation. zn(s) + 2 mno2(s) + h2o(l) zn(oh)2(s) + mn2o3(s) (a) determine the limiting reactant if 17.5 g zn and 31.0 g mno2 are used. (type your answer using the format ch4 for ch4.) (b) determine the mass of zn(oh)2 produced. _ g

The chart shows the bid provided by four contractors to complete a job. which contractor is the most cost-effective?