Chemistry Questions

When two or more chemical species combine to form a single product, the reaction is said to be synthesis reaction. It is also called as Direct Combination reaction.

Here in the given options, Sodium (Na) combines with Chlorine (Cl) to form a more complex single product Sodium Chloride (NaCl).

The chemical name of common salt is Sodium Chloride with a chemical formula NaCl.

The main use of salt in the diet is to produce in small amounts the hydrochloric acid required for the digestion of food.

The compound methane is a simple hydrocarbon contains one carbon bonded to four hydrogens. Ethane is a simple hydrocarbon which contains two carbon atoms and four hydrogen atoms. Similarly, propane with three carbons.

Monazite is an ore of cerium, thorium and lanthanum.

Unlike other gas cycles, the phosphorus cycle differs in having atmospheric reservoir. No other gases are involved in it.

Burning gasoline is the only process that involving in a chemical change in the given options. A chemical change is a change in the starting substances that are called reactants from the formed new substances that are called products. 

Yes, Carbon disulfide is prepared by heating sulfur and charcoal. 

S2 + C ----> CS2