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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. 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 -






2. (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.






3. The force of attraction between two objects. Gravity exists not only on earth - but also between planets as well as in black wholes






4. Average mass of various isotopes of the element.






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






6. The mechanical energy that a body has by virtue of its position Ex. Stored energy -






7. 1000x the base unit






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






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






10. The volume of a gas is directly proportional to the temperature of a gas






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






12. 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.






13. 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.






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






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






16. Conduction - Convection - & Radiation






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






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






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






20. An electric circut with a single path






21. Elements in the middle of the periodic table - in groups 3-12.






22. 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






23. 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.






24. Not as easy to recognize as metal bc they do not always share physical properties. They are dull - brittle - & not good conductors of heat






25. Specific gravity is the ratio based on...






26. Substance that dissociates completely into its ions when added to water and conducts electricity well.






27. Is the change from liquid to gas.






28. Measure of the earth's pull






29. A temperature scale with the freezing point of water 32 degrees and the boiling point of 212 degrees.






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






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






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






33. Where are protons an neutrons located?






34. The sum of the protons and neutrons






35. 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.






36. Causes motion






37. Small uncharged particles in the nucleus they are neutral






38. 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






39. A piece of paper that appears blue in sunlight is illuminated solely by a red light that is passed through a green filter. What color does the paper appear under this illumination?






40. Mass & weight are not the ____ quality






41. A carbon atom linked by a double bond to an oxygen atom. - c=o.






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






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






44. Experiments may not be done on...






45. The difference in electrical charge between two points in a circuit expressed in volt. When an electron goes through a load it does work & loses some energy.






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






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






48. Heat transferred by direct contact






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






50. Negatively charged particles found outside the nucleus