1. A Science Unit for Mrs. Berg’s Class

2. atom
 1. The basic building block of matter.
2. The smallest component of an element having the
chemical properties of the element.

3. chemical formula
 noun A chemical formula or molecular formula is a
way of expressing information about the atoms that
constitute a particular chemical compound. ex.
Al2(SO4)3

4. compound
 noun,verb,adjectiveA substance made up of two or
more elements chemically joined together into a
molecule.
 NaCl = salt

5. electron
 noun particle in an atom that has a negative
electrical charge

6. element
 noun A substance whose atoms are all alike. There
are over 100 elements on the Periodic Table.

7. gas
 noun,verb One of the three states of matter. This
state of matter has no fixed shape and no fixed
volume.

8. heterogeneous
 adjective These types of mixtures contain more than
one substance evenly mixed but not chemically
bonded together and is the same throughout.

9. homogeneous
 adjective When two or more substacnes come
together but don't chemically combine or bond to
make a new substance it is called this.

10. inorganic
 adjective Any substance that does not contain
carbon.

11. ion
 noun a positively or negatively charged atom

12. liquid
 noun,adjective A state of matter that has no fixed
shape but that has a definite volume.

13. matter
 noun,verb Anything that takes up space and has
mass.

14. molecule
 noun The smallest physical unit of a substance that
can exist independently, consisting of one or more
atoms held together by chemical forces.

15. neutron
 noun An elementary particle with 0 charge and mass
about equal to a proton; enters into the structure of
the atomic nucleus.

16. nucleus
 1. The positively charged center of an atom.
2. The nucleus is in the center of the atom

17. organic
 noun,adjectiveObtained from a living thing;
Containing carbon

18. particles
 noun Very small pieces of matter.

19. proton
 noun A stable particle with positive charge equal to
the negative charge of an electron.

20. solid
 noun,adjective A state of matter that has a definite
shape and a definite volume.

21. solution
 noun A homogeneous mixture that has dissolved
substances.