Q1. Sodium thiosulfate solution reacts with dilute hydrochloric acid.
The solution becomes cloudy as the reaction takes place.
(a) The equation for the reaction is:
Na2S2O3(aq)
+
2 HCl(aq)
2 NaCl(aq)
+
SO2(g) +
H2O(1)
+
S(s)
Explain why the solution becomes cloudy.
(2)
(b)
Plan an investigation to show how the concentration of the sodium thiosulfate

Rocks, as they are compressed, begin forming mountains above the earth's surface when two continental plates converge. the continental crust increases in depth as the mountains grow above. the himalayan mountains formed at a convergent plate boundary in this manner. the rocks are smashed together causing them to due to the intense heat and pressure from the colliding plates and eventually forming rock. a) melt; igneous b) layer; sedimentary c) recrystallize; metamorphic d) melt into the earth's interior; metamorphic