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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. Negatively charged particles found outside the nucleus






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






3. Reflects the light in one direction






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






5. All processes cease when temperature approaches 0.






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






7. 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 -






8. 1. Constructive 2. Destructive






9. Objects are in thermal contact if they can affect each others temperature






10. 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.






11. Animals in which of the following groups may have a backbone and a spinal cord?






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






13. 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.






14. 2 or more substances combine to form a compound EX. A+B -> AB






15. Alkali Metals are the most _____________






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






17. 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






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






19. Shiny - softer & less dense. Mostly chemically active






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






21. 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.






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






23. Formed when one or more electrons are transferred from one atom to another. Transfer of electrons happens when metals & non - metals bond.






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






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


26. You see your reflection






27. Average mass of various isotopes of the element.






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






29. # of protons + # of neutrons






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






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






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






33. 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.






34. Causes motion






35. Have properties in between metals and non - metals found in groups 13-16






36. Change from gas to liquid






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






38. A wave in which the particles of the medium move perpendicularly to the direction the wave is traveling






39. Conduction - Convection - & Radiation






40. Series circut - Parallel circut






41. Experiments may not be done on...






42. The agent most widely and most consistently at work changing the appearance of the Earth's surface






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






44. 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.






45. Atoms of the same element that have different numbers of neutrons






46. Where are protons an neutrons located?






47. Is an atom that has all of its electrons in the lowest possible energy levels






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






49. 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)






50. 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.