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






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






3. Uses the principles of capillary action to separate substances such as plant pigments molecules of a larger size will migrate up the paper more quickly produce lines of pigment. - a process used for separating mixtures by virtue of differences in abs






4. Stored mechanical - Nuclear - Chemical - gravitational






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






6. Are small positively charged particles






7. All processes cease when temperature approaches 0.






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






9. Is the change from liquid to gas.






10. # of protons + # of neutrons






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






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






13. The amount of energy required to change a substance from the solid phase to the liquid phase at its melting point






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






15. The principle of conservation of energy: Energy can be transferred and transformed - but it cannot be created or destroyed.






16. You see your reflection






17. When you step out of the shower the floor feels colder on your feet than the bathmat. Because heat is ______________ to the floor.






18. 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






19. Inclined plane - lever - wheel & axle - pulley.






20. Heat transferred by direct contact






21. 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






22. (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.






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. Experiments may not be done on...






25. Used in electrical devices that have to function at temperatures too high for metals.






26. 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.






27. 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.






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






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






30. A principle that states that for every action there is an equal reaction in the opposite direction

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






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






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






34. Change in the apparent frequency of a wave as observer and source move toward or away from each other






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






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






37. 1/1000 the base unit






38. Potential & Kinetic






39. Where are protons an neutrons located?






40. Series circut - Parallel circut






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






42. SI unit of temperature; indicates number of units above absolute zero. To go from Celsius to Kelvin add 273. To go from Kelvin to Celsius subtract 273.






43. According to some scientists - the Earth's average surface temperature is rising as a result of the greenhouse effect. An increase in the atmospheric concentration of which of the following gases is considered to be primarily responsible






44. 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.






45. The amount of energy required for the liquid at its boiling point to become a gas






46. Mass of the substance contained per unit of volume






47. Resistance is measured in...






48. The buoyant force on an object is equal to the weight of the fluid displaced by the object






49. 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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50. Submarines - diving weighting system - naval architecture - Flotation - Buoyancy compensator







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