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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. Polar molecules






2. 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






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






4. Is the change from liquid to gas.






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






6. # of electrons. Non - metals have 4-8 electrons in their outermost energy.






7. The agent most widely and most consistently at work changing the appearance of the Earth's surface






8. Substance that dissociates completely into its ions when added to water and conducts electricity well.






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






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






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






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






13. 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.






14. Potential & Kinetic






15. Conduction - Convection - & Radiation






16. Elements in the middle of the periodic table - in groups 3-12.






17. As the velocity of a fluid increases - the pressure exerted by the fluid decreases - The speed of a fluid - liquid - gas - increases the pressure exerts.






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






19. It scatters light in many directions






20. Mass & weight are not the ____ quality






21. 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






22. 1. nuclear reaction 2. radioactive






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






24. Gram is the base unit of...






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






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






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






28. Series circut - Parallel circut






29. The process of heat transfer via solid contact






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






31. 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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32. Parts of 2 compounds replace each other. Ex. Switch partners AX + BY -> AY + BX






33. Submarines - diving weighting system - naval architecture - Flotation - Buoyancy compensator






34. Where are protons an neutrons located?






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






36. The volume of a gas is directly proportional to the temperature of a gas






37. Force of attraction that holds atoms together - when atoms are bonded chemically they give up their individual properties.






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






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






40. The energy released by a nuclear reaction - binding energy is released when the nuclei of atoms are split apart in a nuclear reaction this binding energy is called nuclear energy.






41. 100x the base unit






42. The more energy the electrons have






43. The center of the atom.






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






45. Heat transferred by fluid current






46. Way of keeping tract of valence electrons






47. Concave






48. They form only over warm oceans






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






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