I) Predict what will happen to the size of metal calcium and give a reason for your answer. ii) Why did the phenolphthalein change colour?

111) What can you conclude from the pop sound given off?

iv) Explain why the pop sound was not produced in the other two test tubes.

the potential energy of the reactants is 200j.

from the energy diagram, the energy of the product formed is 350j; this means that, this reaction is an endothermic reaction, because it absorbs energy from its environment.

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so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer