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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. Average mass of various isotopes of the element.






2. 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.






3. A Compound breaks down into 2 or more simpler substances EX. AB -> A+B






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






5. 2 or more substances combine to form a compound EX. A+B -> AB






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






7. Finding that a solution conducts an electric current shows conclusively that the solution...






8. Liter is the base unit of...






9. The state of two or more objects or substances in thermal contact when they have reached a common temperature - EX. the affects after a hot cup of coffee meeting the desk temperature.






10. Parts of 2 compounds replace each other. Ex. Switch partners AX + BY -> AY + BX






11. 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.






12. Transfer of thermal energy with in a fluid. The particles in a fluid transfer the thermal energy from hot areas to cooler areas EX. the warmed up rising air from a heat source such as a fire or electric heater.






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






14. A gelatinous sample of material from a previously unexplored marine environment is thought to be living or to be composed of recently living material. Which of the following would most clearly confirm that the material has a biological origin?






15. The interference that occurs when two waves combine to make a wave with a larger amplitude






16. 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.






17. 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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18. Describes the force of friction of 2 surfaces that are in contact but do not have any motion relative to eachother.






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






20. Are small positively charged particles






21. Series circut - Parallel circut






22. Alkali Metals are the most _____________






23. Mass & weight are not the ____ quality






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






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






26. The number of electrons per second that flow past a point in a circut.






27. They are neither precise nor accurate.






28. As the velocity of a fluid increases - the pressure exerted by the fluid decreases - The speed of a fluid - liquid - gas - increases the pressure exerts.






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






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






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






32. Is done on an object when an applied force moves across a distance.






33. The property of sound that varies with variation in the frequency of vibration.






34. 1/10 the base unit






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






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






37. 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






38. That for a fixed amount of gas at a constant temperature - the volume of a gas increases as its pressure decreases






39. Reflects the light in one direction






40. Are used in the treatment of cancer b/c they can kill cancer cells. However - if powerful enough they can kill healthy cells.






41. The more energy the electrons have






42. Energy is added to a system one of two things must happen either thermal energy must increase or work must be done.






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






44. The formula F=M/A is a shorthand force equals mass over acceleration. An object will not move unless the force is strong enough to move the mass.






45. Uses the transfer of heat from one substance to another to determine the specific heat of the substance.






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






47. A mixture containing two or more metallic elements or metallic and nonmetallic elements usually fused together or dissolving into each other when molten Ex. Brass is an alloy of zinc and copper






48. Negatively charged particles found outside the nucleus






49. The process of heat transfer via solid contact






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