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






2. Do not have molecules with one of the two molecular arrangements required to give an odor






3. Electrons in the outermost energy level; they are involved in bond formation






4. A material such as glass or porcelain with negligible electrical or thermal conductivity. Electric charges do not move easily - if at all.






5. Two or more simple machines working together EX. wheelbarrow it uses level - wheel & axle.






6. The ability of the material to oppose the flow of electrons through it all






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






8. Reduction in pressure of a fluid resulting from the speed increase as fluids are forced to flow faster through narrow spaces






9. Conduction - Convection - & Radiation






10. Lacking affinity for water. Repels water. Non - polar






11. Harder - denser - have higher melting points & are chemically active.






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






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






14. Rotate at very high speed in order to separate the liquids from the solids. The more dense part of the solution will sediment at the bottom of the test tube. while the lighter material will stay on top. Ex. centrifuge is used to separate blood from b






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






16. 1.) Protons 2.) Neutrons - They both have the same mass - but neutrons have no mass.






17. A compound of which a relatively small amount of the dissolved solute exists as ions in an aqueous solution. Example: Acetic acid - CH3COOH (vinegar)






18. Making and breaking of chemical bonds between atoms bonds involve only the outer electrons & do not effect the nucleus






19. P1/T1=P2/T2. States that the pressure of a fixed amount of gas in a fixed volume is proportional to its temperature.

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






21. States that when 2 objects collide in an isolated system the total momentum of 2 objects after the collision. That is the momentum gained by object.






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






23. Measure of the disorder or randomness of the particles that make of a system (measurement of movement of particles in a spontaneous reaction) EX. entropy increases as matter and energy in the universe degrade to an ultimate state of inert uniformity.






24. 1/1000 the base unit






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






26. The process of heat transfer via solid contact






27. Decibels






28. 1. All are solids having the appearance of metals & non - metals. 2. All are white or gray - but not shiny 3. Conduct electricity - but not as well as metals.






29. Relates pressure & temp. and temp and volume.






30. Most directly involved with controlling levels of sugar in blood






31. Is the transfer of heat with no actual transfer of matter. Ex. Iron pan of flame.






32. Removal of static electricity by conduction






33. The center of the atom.






34. 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.






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






36. Record vibrations in earth & allow us to measure earthquake activity.






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






38. Alkali Metals are the most _____________






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






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






41. Change the chemical composition of a material - Computers can be made small enough to fit inside a plastic credit card - resistors are used to regulate volume on television or radio -






42. Polar molecules






43. Higher because it has higher apparent frequency.






44. Excess energy is released into the environment






45. 2 or more substances combine to form a compound EX. A+B -> AB






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






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






48. Mass & weight are not the ____ quality






49. 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






50. Potential & Kinetic







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