chemistry

4. measures percent of hydrogen ions
5. substance that helps a chemical reaction to proceed more quickly
8. pure substance that can not be broken down
10. the mass of the atom
12. cloudy mixture in which tiny particles of one substance are held within another and particles cannot be separated out from the other substance
13. chemical combination of two or more elements in a specific ratio
14. a reaction that takes place when two
19. substance that reacts with another substance or substances in a chemical reaction to create new substances with different properties
20. a atom that has either gained or lost electrons
21. neutral particle in the nucleus of an atom
22. catalyst involved in chemical reactions in living thing things
23. compound that dissolves in water to form a solution with a ph higher than 7

1. new substance produced in a chemical reaction between reactants
2. substance that can be made into long wire
3. group 18 elements in the periodic table the most and unreactive elements
4. positively charged particle in the nucleus
5. chemical reaction that occurs when oxygen reacts when oxygen reacts with a substance to form a new substance and give of energy
6. device for producing electricity from chemical or solar energy
7. group of atoms acting as one
9. invisible negatively charged particle that orbits the nucleus of a atom
11. creation of electrical circuit
15. conductor through which electric current enters or leaves a device or material
16. number of protons in the nucleus
17. slow chemical change that occurs when oxygen in the air reacts with a metal
18. Products of reaction that can escape