| Question | Answer |
|---|---|
| density | measurement of how packed or crowded the object is, ratio of mass to volume |
| particles, shape, volume, compressibility, energy/disorder of a solid | very close, definite, definite, no, liw |
| particles, shape, volume, compressibility, energy/disorder of a liquid | close, indefinite, definite, no, medium |
| particles, shape, volume, compressibility, energy/disorder of a gas | very far, indefinite, indefinite, yes, high |
| p or c, flammability | chemical |
| p or c, color | physical |
| p or c, reactivity | chemical |
| p or c, volume | physical |
| p or c, density | physical |
| p or c, mass | physical |
| p or c, melting point | physical |
| altering a substance without changing its compocition | physical change |
| one or more substances change into a new substance | chemical change |
| 6 piece of evidence that indicate a chemical change | gas bubbles, solid precipitate, color change, odar, heat, light |
| p or c, conducting electricity | physical |
| law of conservation of mass | matter cannot be created or destroyed in a chemical reaction |
| the smallest unit of matter that retains the identity of the substance | atom |
| center of the atom that contains the mass of the atom | nucleus |
| positively charged subatomic particles, mass=1 amu | protons |
| neutrally charged subatomic particles, mass=1 amu | neutrons |
| region that surrounds the nucleus that contains most of the space in the atom | e cloud |
| negatively charged subatomic particles | electrons |
| atomic number= | number of protons= number of electrons |
| average mass of all isotopes | atomic mass |
| mass number – atomic number | number of neutrons |
| what causes heated elements to emit color | dropping to a lower level |
| contributions of thompson, rutherford, and bohr to atomic history | T- plum pudding, R-gold foil, discovered nucleus, B- electrons orbit in rings |
| fusion | process of combining lighter atoms to form heavier ones |
| explain how and why both positive and negative ions are formed | positive- cations are formed by loosing electrons to achieve 8 in valence shell; negative- anions are formed by gaining electrons to achieve 8 in valaence shell |
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