A wide melting point range (more than 5°C) usually indicates that the substance is impure; a narrow melting point range (O. 5-2°C) usually indicates that the substance is fairly pure.

Knowing the melting point of a chemical is very important for its storage & transport. A higher melting point indicates greater intermolecular forces and therefore less vapour pressure. Melting point test is not required for every chemical. Usually it is conducted for solid materials under normal conditions.

The melting point is a physical property of a solid and can be used to help identify a substance. If the compound melts over a very narrow range, it can usually be assumed that the compound is relatively pure. Conversely, compounds that melt over a wide range are assumed to be relatively impure.

A physical property is a characteristic of a substance that can be observed or measured without changing the identity of the substance. Physical properties include color, density, hardness, and melting and boiling points.

When molecules are tightly packed together, a substance has a higher melting point than a substance with molecules that do not pack well. For example, symmetrical neopentane molecules have a higher melting point than isopentane, in which molecules do not pack well. Molecular size also affects the melting point.

Pure, crystalline solids have a characteristic melting point, the temperature at which the solid melts to become a liquid. The transition between the solid and the liquid is so sharp for small samples of a pure substance that melting points can be measured to 0.1oC.

Diamond, while much harder than the soft metal lead, is not as dense. When a lead bullet hits a target, the metal is soft enough to immediately flatten on impact or even break apart and heavy fragments may even bounce around in the target causing massive damage.

A super-hard metal has been made in the laboratory by melting together titanium and gold. The alloy is the hardest known metallic substance compatible with living tissues, say US physicists.

The short answer is yes, titanium or any metal that is hard enough can cause a ricochet.

Ballistic protection versus sheet thickness for various titanium alloys against 9mm FMJ. V50 ballistic test results are shown in Fig. 4. For 50A, 6-4 and 15-3, a thickness of a 4.2mm (0.126-in) appears to be capable of satisfying the typical requirement3) of no complete penetrations below 426 m s-1 (1400 ft sec-1).