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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. The relationship between voltage - current - and resistance - V=IR






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






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






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






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






6. '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






7. Mass & weight are not the ____ quality






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






9. It is the first element in group 13 - is a poor conductor of electricity at low temperature - however if temperature increases it will become a good conductor.






10. 1. Have some characteristics of metals & non - metals. 2. Properties do not follow patterns like metals & non - metals.






11. 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.






12. 8 electrons






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






14. Formed when one or more electrons are transferred from one atom to another. Transfer of electrons happens when metals & non - metals bond.






15. 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






16. 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.






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






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






19. (physics) a process that alters the energy or structure or composition of atomic nuclei - When a reaction involves the nucleus - elements become different thus is called a nuclear reaction.






20. Average mass of various isotopes of the element.






21. Conduction - Convection - & Radiation






22. Reflects the light in one direction






23. Polar molecules






24. 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.






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






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






28. 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.






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






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






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






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






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






34. Mass of the substance contained per unit of volume






35. Symmetry - crystalline structures are universal - Crystallographic defects - Electrical properties - crystal system






36. Higher because it has higher apparent frequency.






37. Most directly involved with controlling levels of sugar in blood






38. A material such as glass or porcelain with negligible electrical or thermal conductivity. Electric charges do not move easily - if at all.






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






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






41. 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






42. Change from gas to liquid






43. 2 or more substances combine to form a compound EX. A+B -> AB






44. Pressure is measures in a unit called






45. Potential & Kinetic






46. When you step out of the shower the floor feels colder on your feet than the bathmat. Because heat is ______________ to the floor.






47. The centripetal force is provided by the high banking of the curved road & by friction between the wheels & the road.






48. # of protons + # of neutrons






49. 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?






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