Characteristics of matter that can be seen through direct observation such as density, melting point and boiling point

Covalent bonds generally form when the bonded elements have a difference in electronegativity less than 1.5. subtract the electronegativities for the following pairs of elements and predict whether they form a covalent bond. electronegativity difference of c and c: ionic covalent electronegativity difference of mg and cl: ionic covalent

Using the periodic table, complete the following. element: hydrogen symbol: h₂ molecular weight: g mass of one mole: g/mol

In an exothermic reaction, energy may be released to the surroundings in the form of question 4 options: heat light thermal all of the above