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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. Nuclear fission - Nuclear Fusion






2. 1000x the base unit






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






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






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






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

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7. A compound of which a relatively small amount of the dissolved solute exists as ions in an aqueous solution. Example: Acetic acid - CH3COOH (vinegar)






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






9. Reflects the light in one direction






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






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






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






13. It is second element in group 14 - semi - conductor. Sand is made of silicon - it is also used to manufacture glass and cement.






14. Describes the force of friction of 2 surfaces that are in contact but do not have any motion relative to eachother.






15. The speed of light changes in different materials this is due to__






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






17. Number of protons






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






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






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






21. 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.






22. 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






23. 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.






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. 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.






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






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






28. Where are protons an neutrons located?






29. 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.






30. 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.






31. Shiny - softer & less dense. Mostly chemically active






32. Electrons that can accept energy from outside sources and move farther away from the nucleus






33. All processes cease when temperature approaches 0.






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






35. A nuclear reaction in which nuclei combine to form more massive nuclei with the simultaneous release of energy






36. Pressure is measures in a unit called






37. Solids - gasses - and 1 liquid (Bromine)






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






39. 100x the base unit






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






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






42. Group 17; contains nonmetals; 7 electrons in its outermost energy level; very reactive; poor conductors of electric current; never in its uncombined form in nature; combine with most metals to form salts






43. 1. Constructive 2. Destructive






44. Liter is the base unit of...






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






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

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






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






49. 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.






50. The amount of energy required for the liquid at its boiling point to become a gas