The half-life of carbon-14 is 5600 years. if a piece of charcoal made from the wood of a tree shows only 6363% of the carbon-14 expected in living matter, when did the tree die?

Draw the more stable lewis dot structure for bro2-

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

Which of the following is a physical change? a.burning a piece of wood b.sawing a piece of wood in half c.rust forming on an iron fence d.a copper roof changing color from orange to green