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Praxis Physics Basic Principles

Subjects : praxis, science
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. Occurs when an unstable atomic nucleus spontaneously loses energy by emitting ionizing particles & radiation. It is a form of energy transfer. Before Decay = parent nuclide After Decay = Daughter nuclide (s)






2. The capacity for doing work that is based upon position or configuration.






3. Measure of the amount of substance in an object






4. Joining of two nuclei; occurs under extreme temperatures and pressure. Fusion occurs naturally in stars (responsible for the release of great energy).






5. Branch of Physics that studies the conversion of energy into work and heat. Concerned w/ variables such as temperature - volume - and pressure






6. Measurement of Work






7. Properties concerned with the constituent particles that make up a substance. Can include: Atomic Number - Category - Group - Period - Block - weight - electron configuration - electrons per shell - phase - density - Sublimation point - specific heat






8. A variation of an atom; occur when the number of protons in the nucleus are the same but the number of neutrons are not. Written as the element plus the number of Neucleons (i.e. Carbon -13 (6 Protons - 7 Neutrons)






9. The measure of the ratio of a substance's density compared to the density of water.






10. Energy transferred to a body by a means other than work. (through the process of heat)






11. A Machine that converts thermal energy to mechanical energy that can be used to do work






12. Positive; larger than Beta. Because of their large mass they can be easily stopped (even with a sheet of paper.) Can cause severe damage if ingested.






13. This refers to objects that have the same temperature b/c heat is transferred between them to reach equilibrium






14. The quantity of energy transferred by one system to another due to changes in a system that is the result of external forces; also can be described as the amount of energy that must be transferred to overcome a force.






15. Refers to the amount of energy in a system that is no longer available for work. (also used to describe the amount of disorder in a group)






16. When energy is emitted by one body and absorbed by another






17. Substances that consist of only one type of atom






18. Measurement of the amount of cubic space occupied.






19. Contain two or more substances that are combined but have not reacted chemically. They can be separated using physical methods






20. Can be Beta - Minus or Beta Plus. Beta - Minus: contain an energetic electron Beta - plus: emitted by positrons and can result in gamma photons. Beta particles can be stopped by thin metal.






21. Total Kinetic Energy and Potential Energy in a system






22. A System that cannot exchange heat - work - or matter with its surroundings. Total Energy & Mass stay constant w/in system






23. The smallest unit of matter that has the characteristics of an element; consists of three main types of subatomic particles: protons neutrons and electrons.






24. Refers to the particles that are emitted from nuclei as a result of nuclear instability






25. A system that can exchange heat and work - but not matter






26. Attributes such as appearance - color - mass - and volume.






27. Type of High energy electromagnetic radiation consisting of photons. It rids the decaying nucleus of excess energy after it has emitted either alpha or beta radiation. They can cause serious damage to living tissue. It takes thick lead to stop them.






28. Causes an electron to detach from an atom; occurs in radioactive reactions. Three types: 1. Alpha 2. Beta 3. Gamma






29. Two or more atoms held together by covalent bonds






30. The time it takes for half of the radioactive nuclei in a sample to undergo radioactive decay.






31. Splitting of a large nucleus into smaller pieces






32. Atoms that have an unstable nucleus that has excess energy and the potential to make radiation particles within the nucleus or undergo radioactive decay which can result in the emission of gamma rays. May occur naturally or artificially produced.






33. Capable of interacting with a surrounding environment and can exchange heat - work (energy) and matter outside their system boundaries






34. Homogeneous mixtures composed of two or more substances that have become one






35. Isotopes that have unstable nuclei and can undergo spontaneous nuclear reactions which results in particle or radiation being emitted.






36. Hydrogen and Helium are the most abundant. Than Oxygen - Neon - Nitrogen - Carbon - Silicon - and Magnesium.






37. Solid - Liquid - Gas






38. AKA Mass Number. The total number of protons and Neutrons in the nucleus of an atoms. Referred to as 'A.'






39. Isotopes that have not been observed to decay






40. Refers to the fact that the total amount of energy in a closed system is constant






41. Substances that have mass and occupy space






42. Refers to everything outside a thermodynamic system.






43. A misguided belief that a system can continuously produce more energy than it consumes.






44. Measure of the amount of mass per unit volume.






45. Refers to the energy of an object in motion.






46. A change that results in a different substance. They may release or consume energy.






47. A change that does not result in different substances; when an object changes form but not compostion.






48. Transfer of Energy from a body or system as a result of thermal contact. Heat consists of random motion and the vibration of atoms - molecules - & ions. Higher the temperature - greater the atomic/molecular motion






49. Substance containing two or more elements; formed by chemical reactions. Can only be separated by a chemical reaction






50. Measure of gravitational pull of Earth on an object or between two bodies