Biology ch.2 Number 2

2. The central cord of an atom consists of two kinds of particles
4. Is the energy in a system that is available for work
5. Solid,liquid and Gas is the _________ of matter
7. This term refers to a base
8. Substance dissolved in the solution
10. When an atom or molecule with an electrical charge is called this….
11. The number of protons in an atom is called this
14. A catalyst, usually a protein, in living system
15. Forms two atoms share one or more pairs of electrons
17. Reactions that involve a net absorption of free energy are called
19. Scale that compares the relative con
21. - the ion H3O+, consisting of a protonated water molecule and present in all aqueous acids.
22. Any substance that increases the concentration of hydroxide ions when added to a water solution

1. Is the quantity of matter an object has
3. Combining in ways that cause their atoms to become stable
6. In many chemical reactions, the amount of energy needed to start the reaction is called this
9. Are pure substance that can’t be broken down chemically into simpler kinds of matter
12. The simplest part of a substance that retains all of the properties of the substance and that can exists in a free state
13. The reaction in which electrons are transferred between atoms are known as ___________.
16. compound formed by a chemical reaction
18. A measurement of the amount solute dissolved in a fixed amount of solvent
20. Substance in which the solute is dissolved