A chemical bond is any of several forces or mechanisms, especially the ionic bond, covalent bond, and metallic bond, by which atoms or ions are bound in a molecule or crystal.
There are two types of chemical bonds mainly, these are the ionic and covalent bonds. The ionic bonds are formed between metals and non metals whereas the covalent bonds are formed between non metals. A chemical bond is an attraction between two different atoms.
ChemicalTo determine it, you must alter the identity of the substance.
See the Related Questions link to the left of this answer: "What is the difference between a chemical and physical property?"
Elements cannot be altered, without disrupting the physical structure of the atom, so the atomic structure between the protons, neutrons, and electrons are physical.
So which one is it...? Chemical or physical?
Physical. Barney9's answer was a little confusing.. but overall, you can identify an element without disrupting the atomic structure of it's atoms.
Atomic number 80 Atomic mass 200.59 g.mol -1 Electronegativity according to Pauling 1.9 Density 13.6 g.cm-3 at 20°C Melting point - 38.9 °C Boiling point 356.6 °C Vanderwaals radius 0.157 nm Ionic radius 0.11 nm (+2) Isotopes 12 Electronic shell [ Xe ] 4f14 5d10 6s2 Energy of first ionisation 1004.6 kJ.mol -1 Energy of second ionisation 1796 kJ.mol -1 Energy of third ionisation 3294 kJ.mol -1 Standard potential + 0.854 V ( Hg2+/ Hg ) Discovered by The ancients
The chemical formula for nicotine is C10H14N2
See the Related Question (link to the left of this answer).
"How many moles of carbon dioxide are there in a 50.0 dm3 sample of the gas at a pressure of 100.0 kPa and a temperature of 50 degrees celsius?" 1.86 moles