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Praxis General Science

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. Atoms with an equal # of protons and electrons.






2. Static friction - Kinetic friction - Push & pull - rubbing - pull of gravity - forces on objects at rest - forces on a moving object - inertia & circular motion.






3. The more energy the electrons have






4. The center of the atom.






5. Equal volumes of gases at the same temperature and pressure contain equal numbers of particles






6. The relationship between voltage - current - and resistance - V=IR






7. What are the # of protons in the nucleus of an atom called?






8. (of a chemical reaction or compound) occurring or formed with absorption of heat. Absorbs energy from its surroundings.






9. Alkaline earth metals






10. Measure of the earth's pull






11. Non - metals - group 18 - the most non - reactive elements






12. Electronic equipment that provides visual images of varying electrical quantities - Useful in studying waves b/c it gives a picture of the wave.






13. Is the transfer of energy by waves such as the electromagnetic waves emitted by stars the sun warms the earth by emitting radiant energy.






14. Substance that dissociates completely into its ions when added to water and conducts electricity well.






15. Organic molecules that are composed of only carbon and hydrogen.






16. Is the study of the relationship between motion & the forces affecting motion.






17. Average mass of various isotopes of the element.






18. The branch of physics that deals with static electricity - study of stationary electric charges.






19. Solutes that have bonds; no electrically charged species are created when they dissolve in water; glucose; lipids; urea






20. Mass of the substance contained per unit of volume






21. Way of keeping tract of valence electrons






22. A boulder is sitting at the edge of the cliff it has which type of energy?






23. Number of protons






24. The amount of energy required to change a substance from the solid phase to the liquid phase at its melting point






25. Current is measured with a device called...






26. It scatters light in many directions






27. A free element replaces an element that is a part of a compound. Ex. A +BX -> AX + B






28. The difference in electrical charge between two points in a circuit expressed in volt. When an electron goes through a load it does work & loses some energy.






29. A temperature scale with the freezing point of water 32 degrees and the boiling point of 212 degrees.






30. # of electrons. Non - metals have 4-8 electrons in their outermost energy.






31. Uses electrical charges of molecules to separate them according to their size the molecules such as DNA or proteins - are pulled through a gel towards either the positive end of the gel box.






32. The total entropy of a system plus that of its surroundings always increase.






33. Clustered regions of aligned magnetic atoms. When these regions are aligned with one another - the substance containing them is a magnet.






34. Electrical - Light (radiant) - Heat (thermal) - Movement






35. Elements in the middle of the periodic table - in groups 3-12.






36. Series circut - Parallel circut






37. Not as easy to recognize as metal bc they do not always share physical properties. They are dull - brittle - & not good conductors of heat






38. 1. nuclear reaction 2. radioactive






39. The sum of the protons and neutrons






40. Heat absorbed or radiated during a change of phase at a constant temperature and pressure - the amount of heat required to undergo a phase change






41. Liter is the base unit of...






42. Experiments may not be done on...






43. (physics and chemistry) the smallest component of an element having the chemical properties of the element






44. Uses sound waves to locate objects and is especially useful underwater the sound waves bounce off the object and are used to assist in location






45. The amount of heat it takes to change a solid to a liquid






46. The energy released by a nuclear reaction - binding energy is released when the nuclei of atoms are split apart in a nuclear reaction this binding energy is called nuclear energy.






47. Small uncharged particles in the nucleus they are neutral






48. Resistance is measured in...






49. An electric circut with a single path






50. Pushing a vacuum cleaner or pulling a bowstring applies muscular force when the muscles expand & contract elastic force occurs when an object returns to its original shape (for example - when a bow is released)