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






2. Concave






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






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






5. Relates pressure & temp. and temp and volume.






6. The same pathogen must be found in every person with the same disease - the pathogen must be isolated & grown in a culture - when the organism is re - introduced in an experimental animal - that animal should develop the same disease originally seen


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






8. 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.






9. The more energy the electrons have






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






11. Compounds that speed up chemical reactions. Sometimes without Catalysts reactions cant occur.






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






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






14. Excess energy is released into the environment






15. 1/10 the base unit






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






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






18. Which of the following parts of the Sun is easily visible only during a total solar eclipse






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






20. Describes the force of friction of 2 surfaces in contact with eachother . When there is relative motion between the surface.






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






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






23. Resistance is measured in...






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






25. You see your reflection






26. (physics) the capacity of a physical system to do work - or supply heat.






27. Static friction - Kinetic friction - Push & pull - rubbing - pull of gravity - forces on objects at rest - forces on a moving object - inertia & circular motion.






28. The process of heat transfer via solid contact






29. 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.






30. 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.






31. The sum of the protons and neutrons






32. 1. Liquid crystals - when certain solids melt their crystal lattices disintegrate & their particles lose their 3- dimensional pattern. 2. Solid - as a liquid substance cools & forms a solid. The strong attractive forces between oppositely charges ion






33. 100x the base unit






34. The interference that occurs when two waves combine to make a wave with a larger amplitude






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






36. The object is further than one focal length from the lens






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


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






39. Pressure is measures in a unit called






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






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






42. Way of keeping tract of valence electrons






43. Reflects the light in one direction






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






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






46. A wave in which the particles move parallel to the path of the wave






47. Experiments may not be done on...






48. An object's _____ gives it resistance to change its current state of motion it is also the measure of an objects resistance to acceleration.






49. The amount of energy that it takes to raise one gram of water one degree celsius.






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