ch. 2 crossword 2

1. the quantity of matter an object has
4. the energy in a system that is available for work
6. breaking apart of the water molecule into two ions of opposite charge
7. reactions in which electrons are transferred between atoms
8. is a mixture in which one or more substances are uniformly distributed in another solution
10. ion the OH- is known as this
12. the amount of energy needed to start the reaction
13. pure substances that cannot be broken down chemically into simpler kinds of matter
14. a solid liquid or a gas
16. a compound formed by a chemical reaction
17. it forms when two atoms share one or more pairs of electrons
20. the central core of an atom consists kinds of particles name one

1. the simplest part of a substance that retains all of the properties of the substance and that can exist in a free state
2. chemical substances that neutralize small amounts of either an acid or a base added to a solution
3. solution solutions in which water is the solvent
5. reactions that involve a net absorption of free energy
9. combining in ways that cause their atoms to become stable
11. solution no more solute can dissolve
12. the number of protons in an atom
15. an atom or molecule with an electrical charge
18. a catalyst usually a protein in a living system
19. the number of hydronium ions in a solution is greater than the number of hydroxide ions