Biology ch.2 Number 2

3. The central cord of an atom consists of two kinds of particles
5. The number of protons in an atom is called this
7. Is the energy in a system that is available for work
10. Reactions that involve a net absorption of free energy are called
13. When an atom or molecule with an electrical charge is called this….
14. The simplest part of a substance that retains all of the properties of the substance and that can exists in a free state
16. This term refers to a base
18. Forms two atoms share one or more pairs of electrons
20. Are pure substance that can’t be broken down chemically into simpler kinds of matter
21. Substance dissolved in the solution
22. - the ion H3O+, consisting of a protonated water molecule and present in all aqueous acids.

1. compound formed by a chemical reaction
2. A measurement of the amount solute dissolved in a fixed amount of solvent
4. Solid,liquid and Gas is the _________ of matter
6. The reaction in which electrons are transferred between atoms are known as ___________.
8. Scale that compares the relative con
9. Substance in which the solute is dissolved
11. Combining in ways that cause their atoms to become stable
12. In many chemical reactions, the amount of energy needed to start the reaction is called this
15. Any substance that increases the concentration of hydroxide ions when added to a water solution
17. A catalyst, usually a protein, in living system
19. Is the quantity of matter an object has