science

7. membrane-enclosed organelle
8. type of chemical bond formed through an electrostatic attraction between two oppositely charged ions
11. large biological molecules
12. excessive loss of body water
14. chemical reactions
15. basic building blocks of matter
17. surface on which a plant or animal lives
18. a group of naturally occurring molecules that include fats

1. pure chemical substance consisting of two or more different chemical elements
2. subatomic particle with a negative electric charge
3. covalent chemical bond formed between two molecules
4. electrically neutral group of two or more atoms held together by chemical bonds
5. form of matter that has constant chemical composition
6. subatomic particle with a positive electric charge
9. substance that, in aqueous solution, is slippery to the touch
10. the cleavage of chemical bonds by the addition of water
13. combination or composition
16. chemistry subdiscipline involving the scientific study of the structure