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What does $C_2O_5$ mean?
1. 2 carbon atoms and 5 oxygen atoms
2. 3 carbon atoms and no oxygen atoms
3. 4 carbon atoms and no oxygen atoms
4. 5 carbon atoms and 2 oxygen atoms
Compounds are pure substances made of
1. two or more kinds of atoms.
2. two of the same type of atom.
3. more than 5 types of atoms.
4. mixtures.
Compounds are formed as a result of                       .
1. a physical combination
2. being pure
3. a filtration mixture
4. a chemical combination
The difference between an atom and a molecule is that
1. most atoms are bonded together to make a molecule.
2. an atom can be seen by scientists, but a molecule cannot.
3. atoms and molecules are the same and have no differences.