6. Read the following sentences: "When the atoms of a specific substance are regrouped, a new substance is formed with often vastly different properties from the
original substance. Occasionally something completely harmless, or even necessary,
can become dangerous or lethal when its molecules (a grouping of two or more atoms)
are regrouped."
What does the word properties mean above?
A. extremely large amounts
B. places where experiments are done
C. qualities or characteristics
D. elements or compounds
7. Choose the answer that best completes the sentence below.
Oxygen by itself is not harmful; it can become harmful when combined with
carbon
A. however
B. for instance
C. in summary
D. namely