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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. Solid has a definite shape and volume - Liquid has definite volume - but no shape - Gas has no shape of volume.






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






3. Small uncharged particles in the nucleus they are neutral






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






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






6. 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.






7. The device (bell or Build) is an example of a load. A load is a device that uses energy.






8. A unit of heat equal to the amount of heat required to raise the temperature of one kilogram of water by one degree at one atmosphere pressure. used by nutritionists to characterize the energy - producing potential in food






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






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






11. The theory that all matter is composed of particles (atoms and molecules) moving constantly in random directions






12. 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






13. 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.






14. They are neither precise nor accurate.






15. Excess energy is released into the environment






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






17. Removal of static electricity by conduction






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






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






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






21. Carbon atom - atomic number 6 - atomic mass 11






22. Polar molecules






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






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






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






26. 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.






27. Alkali Metals are the most _____________






28. The molecular weight of a substance expressed in grams - measures the amount of a substance






29. 1. Constructive 2. Destructive






30. 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.






31. Number of protons






32. 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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33. 1.) Protons 2.) Neutrons - They both have the same mass - but neutrons have no mass.






34. # of protons + # of neutrons






35. 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?






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






37. Friction opposes the motion of one surface past another - Friction is common when slowing down a car or sledding down a hill.






38. 1. Make more coils - 2. put an iron cover (nail) inside the coils - use more battery power






39. What quantity of oxygen - O2 - contains very nearly the same number of molecules as 36.0 grams of water - H2O?






40. An isotope has a different number of...






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






42. The sum of the protons and neutrons






43. 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






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






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






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






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






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






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






50. Several vehicles - initially at a complete stop - begin a long race at the same starting point. The vehicle that has a constant value for which of the following is most likely to win?