Across
- 3. a group of two or more atoms that are linked together by chemical bonds; the smallest particle that characterizes a compound.
- 4. a subatomic particle representing the basic unit of a negative charge
- 5. sum of protons and neutrons in a nucleus
- 6. a record of the distribution of particles in a sample according to mass
- 9. a substance which cannot be broken down into simpler substances by ordinary chemical means
- 10. characteristics
- 13. the branch of science that deals with the study of the composition, structure, and properties of matter and the changes that matter undergoes
- 15. process of purifying a liquid by boiling and collecting vapor
- 18. the temperature at which a solid changes into a liquid; the vapor pressures of solid and liquid are equal at this temperature
- 21. a substance which can be broken down by chemical means into simpler substances
- 22. subatomic particle which protons, neutrons, and other particles are thought to be composed of.
- 23. process of separating mixtures by taking advantage of their differing solubilities in a given solvent
- 31. the energy possessed by matter due to its motion
- 33. a technique used to separate components of mixtures based on their differing solubilities or interactions with a stationary liquid or solid phase
- 35. the temperature at which a liquid is changed into a gas; the vapor pressure of a liquid and gas are equal at this temperature
- 38. the small, dense, center of an atom
- 40. a quantity described as the randomness of a substance or system
Down
- 1. the mass per unit volume of a substance
- 2. a grouping of elemental symbols which tells not only what types of atoms compose the compound but also the number of each type of atom in one molecule of the compound
- 3. an instrument used to determine the isotopes present in an element
- 4. a reaction in which the products have a lower heat energy content than the reactants
- 7. a class of matter that is homogeneous, of definite composition, and has its own unique properties which make it different from every other substance, it may either be an element or a compound.
- 8. change a change in the physical appearance of matter but not in the identity
- 11. average mass of atoms of an element relative to carbon-12 isotope
- 12. a measure of the force of gravity upon an object
- 14. the materials that compose the physical universe, anything that has mass and occupies space
- 16. a reaction in which the products have a higher heat energy content than the reactants
- 17. a state of matter characterized by particles which are close together, held in a fairly rigid positions about which they vibrate; a solid has definite volume and shape
- 18. two or more elements or compounds that are physically mixed but not chemically combined
- 19. subatomic particle found in nucleus having positive charge
- 20. the measure of the quantity of matter in an object
- 24. how close a measurement is to the actual value
- 25. the smallest particle of an element that retains the characteristics of the element
- 26. a negatively charged ion
- 27. an atom or molecule that is electrically charged because it has a different number of electrons than protons
- 28. a subatomic particle in the nucleus of the atom
- 29. a fourth state of matter in which matter is partially broken down into electrons and ions
- 30. a positively charged ion
- 32. atoms of the same element that differ in their mass numbers
- 34. model a model for the atom consisting of nucleus and mostly empty space occupied by light electrons
- 36. the reproducibility or repeatability of a measurement
- 37. a proton or a neutron
- 39. a part of a system which is in contact with but physically distinct from other parts of the system