Question

writing of word equations, chemical equations and state the type of reaction. Write atleast 30 reactions​

Answer 1

. Among common catalysts are precious metal compounds used in automotive exhaust systems that accelerate the breakdown of pollutants such as nitrogen dioxide into harmless nitrogen and oxygen. A wide array of biochemical catalysts are also known, including chlorophyll in plants (which facilitates the reaction by which atmospheric carbon dioxide is converted to complex organic molecules such as glucose) and many biochemical catalysts called enzymes. The enzyme pepsin, for example, assists in the breakup of large protein molecules during digestion.

Classification by type of product

Gas-forming reactions

Many reactions produce a gas such as carbon dioxide, hydrogen sulfide (H2S), ammonia (NH3), or sulfur dioxide (SO2). An example of a gas-forming reaction is that which occurs when a metal carbonate such as calcium carbonate (CaCO3, the chief component of limestone, seashells, and marble) is mixed with hydrochloric acid (HCl) to produce carbon dioxide.

CaCO3(s) + 2 HCl(aq) → CaCl2(aq) + CO2(g) + H2O (l)

In this equation, the symbol (aq) signifies that a compound is in an aqueous, or water, solution.

Cake-batter rising is caused by a gas-forming reaction between an acid and baking soda, sodium hydrogen carbonate (sodium bicarbonate, NaHCO3). Tartaric acid (C4H6O6), an acid found in many foods, is often the acidic reactant.

C4H6O6(aq) + NaHCO3(aq) → NaC4H5O6(aq) + H2O (l) + CO2(g)

In this equation, NaC4H5O6 is sodium tartrate.

Bread-dough rising, a gas-forming reaction between tartaric acid and baking soda.

Bread-dough rising, a gas-forming reaction between tartaric acid and baking soda.

Most baking powders contain both tartaric acid and sodium hydrogen carbonate, which are kept apart by using starch as a filler. When baking powder is mixed into the moist batter, the acid and sodium hydrogen carbonate dissolve slightly, which allows them to come into contact and react. Carbon dioxide is produced, and the batter rises.