bonus points

2. a transition of a substance directly from solid to gas.
3. atoms will gain, lose, or share valence e- to attain an 8-valence electron.
4. the enthalpy change for a reaction carried out in multiple steps equals the sum of the enthalpy changes for each step.
6. the pressure of an individual gas when in a mixture of gases
10. When 2 liquids do not mix.
11. the number of protons in the nucleus.
14. atoms of the same element with different numbers of neutrons.
16. a mixture that is not uniform.
17. how close a measured value is to an accepted value.
18. Stirring, Crushing, and Heating help the rate of ____
19. Heat is measured as ___

1. tend to form covalent bonds.
5. Ionic compounds are called ___
6. Property a characteristic that can be observed or measured without changing the sample’s composition.
7. the temperature and pressure at which the solid, liquid, and gas forms of a substance coexist.
8. the study of how heat is converted to and from other forms of energy and how it affects matter.
9. molecules move faster
12. the mass of one mole of particles.
13. The substances that change are called ____
15. how close a series of measurements are to each other.