Lake County MIJ Comprehensive Science 2 V17, Leonel Velez (4565/S)
The table below shows the half-life of an element:
Half-Life Data
Element Half-Life
Carbon-14 5,730 years
Scientists have found that the carbon-14 content of an unknown prehistoric sample was reduced to one-half. What best describes the identity of the
sample?
An organism that died more than 10,000 years ago
O A rock that formed more than 10,000 years ago
An organism that died 5,730 years ago
O A rock that formed 5,730 years ago
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USO 11

the answer is c i believe

6.4 cm (max) - 25 cm (min)

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.