Across
- 2. the starting materials in a chemical reaction
- 4. A closed path through which electrons flow.
- 7. a combination of two or more substances that are not chemically combined
- 8. an ion with a positive charge
- 10. the state in which matter takes the shape of its container and has a definite volume
- 13. point an object that appears to stay in place in relation to an object being observed for motion
- 14. A push or pull one body exerts on another.
- 15. one of the elements of group 18 of the periodic table, are unreactive
- 19. an element that is shiny and that conducts heat and electricity well
- 21. a meteoroid that reaches Earth's surface without burning up completely
- 22. The amount of time required for one-half of the nuclides in a sample of radioactive isotope to decay.
- 23. a wave interaction that occurs when two or more waves overlap
- 25. The transfer of energy through matter in which energy moves from particle to particle
- 26. The transfer of energy by the bulk movement of matter in which particles move from place to place in fluid, carrying the energy with them.
- 28. a horizontal row of elements in the periodic table
- 31. A mixture in which different parts can be easily distinguished.
- 32. The bending of waves around a barrier.
- 33. a relatively small, rocky body that travels through space
- 34. a factor that changes in an experiment in order to test a hypothesis
- 36. The unit of measuring current,the rate of flow of electrons in a circuit
- 37. the rate of motion at a given instant in time.
- 39. The highest point of a wave.
- 44. a group of atoms that are held together by chemical forces, smallest unit of matter that can exist by itself
- 45. a pattern, plan, representation, or description designed to show the structure or workings of an object, system, or concept
- 46. a homogeneous mixture throughout which two or more substances are uniformly dispersed
- 48. The maximum distance the particles of a waves medium vibrate from their rest position
- 49. A chemical equation that has the same number of atoms of each element on both sides of the equation
- 52. the substance in which a solute is dissolved to form a solution
- 53. circuit a circuit in which different loads are on separate branches
- 55. an atom's central region, which is made up of protons and neutrons
- 57. the amount of energy needed to change the temperature of 1 kg of a substance by 1°C
- 61. any use of the senses to gather information
- 62. The unit of measure for frequency.
- 63. an observe change in the frequency of a wave when the source or observer is moving
- 64. the process in which two or more nuclei with small masses join together, or fuse, to form a larger, more massive nucleus
- 68. the rate at which work is done
- 71. the change of state in which a solid becomes a liquid by adding heat
- 72. the speed of an object in a particular direction
- 73. Force exerted by every object in the universe on every other object. The amount of force depends on the masses of the objects and the distance between them.
- 74. a measure of the size of a body or region in three-dimensional space
- 76. the SI unit of force
- 77. a measure of the gravitational force exerted on an object; its value can change with the location of the object in the universe
- 78. the positively charged particles of the nucleus; the number of protons in a nucleus is the atomic number that determines the identity of an element
- 79. The tendency of an object to resist any change in its motion. If motionless, it tends to remain at rest; if moving, it tends to keep moving at the same speed and in the same direction.
Down
- 1. The rate at which velocity changes over time
- 3. a natural or artificial body that revolves around a planet
- 5. anything that has mass and takes up space
- 6. an electron that is found in the outermost shell of an atom and determines the atom's chemical properties
- 7. the sum of the numbers of protons and neutrons in the nucleus of an atom
- 9. an element that has properties of both metals and nonmetals
- 11. A material that does not allow heat or electrons to move through it easily.
- 12. a bright streak of light that results when a meteoroid burns up in Earth's atmosphere
- 16. A characteristic of a substance that indicates whether it can undergo a specific chemical change
- 17. the force that results from combining all the forces exerted on an object
- 18. The force that holds together the atoms in a compound; it occurs because atoms of most elements become more stable by losing, gaining and sharing electrons
- 20. A mixture in which different materials are blended evenly so that the mixture is the same throughout; also called a solution.
- 24. all the frequencies or wave lenghts of electromagnectic radiation
- 25. A change in which one or0 more substances are converted to different substances
- 27. atoms that have the same number of protons but have different numbers of neutrons
- 29. a charged election emitted during certain types of radioactive decay
- 30. acceleration acceleration in which velocity increases
- 35. the amount of force exerted per unit area of a surface
- 38. the rate at which an object moves; speed depends on the distance traveled and the time taken to travel that distance
- 40. a large cloud of gas and dust in interstellar space; a region in space where stars are born
- 41. an element that conducts heat and electricity poorly
- 42. The temperature at which vapor bubbles form in a liquid and rise to the surface,increasing evaporation
- 43. the SI unit of pressure
- 47. a measure of the amount of matter in an object
- 50. A particle of nuclear radiation emitted from a decaying
- 51. a wave in which the particles of the medium vibrate back and forth along the path that the wave travels
- 53. energy the energy of position or shape
- 54. A testable prediction used to see how something works or to solve a problem.
- 56. the energy of motion;kinetic energy depends on speed and mass
- 57. a series of steps followed to solve problems
- 58. The force that causes an object moving along a circular path to move toward the center of the path
- 59. The force that opposes motion between two surfaces that are touching each other.
- 60. The change of substances to different substances
- 65. the substance that is dissolved to form a solution
- 66. a subatomic particle that has no charge and is in the nucleus of an atom
- 67. the state of matter in which the volume and shape of a substance are fixed
- 69. machines the six machines from which all other machines are constructed: a lever, an inclined plane, a wedge, a screw, a wheel and axle, and a pulley
- 70. an object's change in position relative to a reference point
- 75. a substance that forms in a chemical reaction