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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. The transfer of heat by electromagnetic waves is called?






2. F - branch of chemistry that deals with the chemical action of electricity and the production of electricity by chemical reactions






3. Is the path along which electrons flow






4. 1. Have some characteristics of metals & non - metals. 2. Properties do not follow patterns like metals & non - metals.






5. Consists of frequency (f) - measured in hertz - and wavelength measured in meters - the frequency times the wavelength of every electromagnetic wave equals the speed of light.






6. 1. Like charges repel one another - 2. Opposite charges attract each other - 3. charge is considered a neutral object has no net charge.






7. Is the work done divided by the amount of the time it took to do it. P= w/t






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






9. 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)






10. Force of attraction that holds atoms together - when atoms are bonded chemically they give up their individual properties.






11. Small uncharged particles in the nucleus they are neutral






12. 1000x the base unit






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






14. Inertia is the tendency of any object to resist change in motion. An object at rest tends to stay at rest. An object that is moving tends to keep moving.






15. Stored mechanical - Nuclear - Chemical - gravitational






16. Discovered in the late 1800s that micro organisms play a casual role in onset of a disease






17. Causes motion






18. ______ of an atom is equal to the # of protons plus the # of protons plus the # of neutrons






19. 1/1000 the base unit






20. (physics) the capacity of a physical system to do work - or supply heat.






21. Way of keeping tract of valence electrons






22. Solids - gasses - and 1 liquid (Bromine)






23. The object is further than one focal length from the lens






24. A buret is used to deliver solution in precisely - measured - variable volumes. deliver one reactant until the precise end point of the reaction is reached.






25. The mechanical energy that a body has by virtue of its position Ex. Stored energy -






26. Uses percent light absorbance to measure a color change - thus giving qualitative data using quantitative value - measures light intensity as a function of color - or more specifically - the wavelength of light.






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






28. Alkali Metals are the most _____________






29. It is second element in group 14 - semi - conductor. Sand is made of silicon - it is also used to manufacture glass and cement.






30. Gram is the base unit of...






31. A nuclear reaction in which nuclei combine to form more massive nuclei with the simultaneous release of energy






32. The interference that occurs when two waves combine to make a wave with a smaller amplitude






33. A nuclear reaction in which a massive nucleus splits into smaller nuclei with the simultaneous release of energy






34. Ratio of the density of a substance to the density of water






35. The mechanical energy that a body has by virtue of its motion - energy of a moving object.






36. It is the first element in group 13 - is a poor conductor of electricity at low temperature - however if temperature increases it will become a good conductor.






37. Series circut - Parallel circut






38. Electrons that can accept energy from outside sources and move farther away from the nucleus






39. 'An object at rest will remain at rest - and an object moving at a constant velocity will continue moving at a constant velocity - unless it is acted upon by an unbalanced force.' Another name is Law of Inertia






40. Is formed when 2 atoms share electrons - covalent bonding happens among non - metals.






41. The force of attraction between two objects. Gravity exists not only on earth - but also between planets as well as in black wholes






42. The monovalent group - OH in such compounds as bases and some acids and alcohols. Makes the molecule polar which increases the solubility of a compound.






43. Is the change from liquid to gas.






44. Alkaline earth metals






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






46. (physics) a process that alters the energy or structure or composition of atomic nuclei - When a reaction involves the nucleus - elements become different thus is called a nuclear reaction.






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






48. Measures the amount of matter in an object






49. Is a simple device used to indicate the existence of a positive or negative charge.






50. A functional group consisting of a phosphorus atom covalently bonded to four oxygen atoms. Ideal for energy transfer reactions (ATP).







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