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






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






4. 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






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






6. Measures the amount of matter in an object






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






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






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






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






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






12. 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






13. Metal - nonmetals - & metalliods






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






15. Resistance is measured in...






16. 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?






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






18. The center of the atom.






19. 100x the base unit






20. 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.






21. # of protons + # of neutrons






22. The acceleration of an object depends on the mass of the object and the amount of force applied.






23. 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

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24. Metric unit for measuring temperature; On this scale water freezes at zero and boils at 100.






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






26. Mass of the substance contained per unit of volume






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






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






29. Pushing a vacuum cleaner or pulling a bowstring applies muscular force when the muscles expand & contract elastic force occurs when an object returns to its original shape (for example - when a bow is released)






30. Mass & weight are not the ____ quality






31. Reflects the light in one direction






32. 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.






33. 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.






34. 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 -






35. The process of heat transfer via solid contact






36. All processes cease when temperature approaches 0.






37. A mixture containing two or more metallic elements or metallic and nonmetallic elements usually fused together or dissolving into each other when molten Ex. Brass is an alloy of zinc and copper






38. What are the # of protons in the nucleus of an atom called?






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






40. 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.






41. 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?






42. A circut with two or more resistors where the electricity has more than one path to travel






43. 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.






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






45. 'An object at rest will remain at rest - and an object moving at a constant velocity will continue moving at a constant velocity - unless it is acted upon by an unbalanced force.' Another name is Law of Inertia






46. 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






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






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






49. Alkali Metals are the most _____________






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