Question

You are fixing your car and get grease all over your hands. Grease is a high molecular weight, non-polar substance. You have the following substances at your disposal to clean your hands: water, alcohol (ethanol: C2H5OH), gasoline (octane: C8H18), ammonia, hydrochloric acid, and salt (sodium chloride).

1. Identify the ionic compounds. Give reasons.

2. Using your knowledge of solubility, liquid properties, and intermolecular forces, which substance would you use to clean your hands? Choose one substance only. Give reasons for your choice.

Answer 1

1.7 Water (Ho) is a on 1490) is a covalent compound os the bond betooen oxygen and hydrogen us formed by sharing of electrone. Ethanol (C₂H5OH) does not form ions when in solution. So, it is not ionice. It is covalent. Yasoline (octane: (GH18) is also a covalent compound as the bound between C and it is forstmed by sharing of electrons. Arrimonio (NH2) is also a covalent compound as the bound between N and his formed by sharing of electrons. Hydrochloric Acid (Hu) is loric compound as it ionizes into he and hions when in solution Sodium Chloride (Nac) is ionic compound as the bound between No and el és ionic bond (bond formed by transforence of electrons from one atom to another). .. Tonde Compounds :- Hydrochloric acid, sodium chloride

27 In order to wash away the grouse with help of the above compounds, it is necessary for grease to be soluble in that substance. We know like dissolves like. .. Polar seebstance is more soluble or dissolros im polar solgent. fame is the case for non-polar substance, Nom polar substance is more soluble or dissolros in non-polar solvent. the know, Grease is Non-Polar Solvent. So, it will be washed away with mom polar substance only. Among the above compounds, only Gasoline (octane: C H18) is Nom- Polar substance. . We will choose Gasoline to clean the hands.