With the of balanced chemical equation explain what happens when: (1)zinc is put in dilute hydrochloric acid (2)zinc is put in concentrated sodium hydroxide.(3)hydrogen is passed over hot tungsten oxide.(40hydrogen is reacted with carbon monoxide in presence of a catalyst.

1)

2)

3)

4)

Explanation:

The following happens:

(1)Zinc is put in dilute hydrochloric acid

There is an evolution of hydrogen gas as the Zinc undergoes oxidation by hydrogen and it reduces the hydrogen to hydrogen gas.

(2)Zinc is put in concentrated sodium hydroxide.

Again there is evolution of hydrogen gas and formation of zincate sodium. This happens when we heat the mixture.

(3)Hydrogen is passed over hot tungsten oxide.

The hydrogen reduces the tungsten metal during the reaction and it gives solid tungsten metal.

(4) Hydrogen is reacted with carbon monoxide in presence of a catalyst.

This is producer gas reaction.

chemical digestion occurs in the stomach were hcl and pepsin forms chyme, the mouth in which salivary amylase breaks down starch to form bolus, and the small intestine specifically the duodenum.