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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. Way of keeping tract of valence electrons






2. Number of protons






3. Excess energy is released into the environment






4. ______ of an atom is equal to the # of protons plus the # of protons plus the # of neutrons






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






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






7. Higher because it has higher apparent frequency.






8. 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.






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






10. Stored mechanical - Nuclear - Chemical - gravitational






11. 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.






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






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






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






15. Liter is the base unit of...






16. 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.






17. 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.






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






20. 10x the base unit






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






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






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






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






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






26. Concave






27. 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.






28. 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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29. Carbon atom - atomic number 6 - atomic mass 11






30. The more energy the electrons have






31. The transfer of heat by electromagnetic waves is called?






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






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






35. When measuring the volume of water in a graduated cylinder where does one read the measurement?






36. The region around a magnet where the magnetic force is exerted






37. Where are protons an neutrons located?






38. Measures the amount of matter in an object






39. Temporary magnets that lose their magnetism when electric current is removed






40. 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






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






42. The Earth's seasons can be attributed primarily to which of the following in conjunction with its revolution about the Sun?

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






44. An electric circut with a single path






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






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

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






48. Alkaline earth metals






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






50. 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.