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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. Shiny - softer & less dense. Mostly chemically active






2. Way of keeping tract of valence electrons






3. Relates pressure & temp. and temp and volume.






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






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






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






7. When force is applied to an object it moves in a straight line and adding force can make it go faster or slow down.






8. Are small positively charged particles






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






10. 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






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. The state of two or more objects or substances in thermal contact when they have reached a common temperature - EX. the affects after a hot cup of coffee meeting the desk temperature.






13. Electrons in the outermost energy level; they are involved in bond formation






14. '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






15. Measures the amount of matter in an object






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






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






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






19. Pressure is measures in a unit called






20. 10x the base unit






21. Negatively charged particles found outside the nucleus






22. Excess energy is released into the environment






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






24. 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.






25. (of a chemical reaction or compound) occurring or formed with absorption of heat. Absorbs energy from its surroundings.






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






27. 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






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






29. Higher because it has higher apparent frequency.






30. Solid has a definite shape and volume - Liquid has definite volume - but no shape - Gas has no shape of volume.






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






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






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






34. Heat transferred by direct contact






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






36. Uses the transfer of heat from one substance to another to determine the specific heat of the substance.






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






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






39. Conduction - Convection - & Radiation






40. Organic molecules that are composed of only carbon and hydrogen.






41. Causes motion






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






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






44. Is the transfer of energy by waves such as the electromagnetic waves emitted by stars the sun warms the earth by emitting radiant energy.






45. Measure of the earth's pull






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






47. Harder - denser - have higher melting points & are chemically active.






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






49. All processes cease when temperature approaches 0.






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