50 points! When a sodium thiosulfate solution (Na2S2O3(aq)) is added to hydrochloric acid, sulfur is formed.

1. What would you observe during the reaction? How could you set up the experiment to measure the reaction time for a given combination of thiosulfate and acid solutions?

2. What other products are formed?

3. Apart from heating it, how else could you speed up the reaction? How would this work?

1. Insoluble yellow solid sulfur forms and gets deposited at the bottom. to setup the experiment draw a cross on a white paper and place beaker on top of it. take known volumes of sodium thiosulfate and hydrochloric acid in a beaker and mix it. At the same time start stop watch. measure time taken for the cross to disappear.

2. Sodium chloride, sulfurdioxide and water

3. increase concentration of acid

the answer is 303.15 or 303

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.