Test your basic knowledge |

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






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






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






4. 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.






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






6. Measure of the disorder or randomness of the particles that make of a system (measurement of movement of particles in a spontaneous reaction) EX. entropy increases as matter and energy in the universe degrade to an ultimate state of inert uniformity.






7. Change from gas to liquid






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






9. 1/1000 the base unit






10. Not as easy to recognize as metal bc they do not always share physical properties. They are dull - brittle - & not good conductors of heat






11. 1000x the base unit






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






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






14. 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.






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






16. (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.






17. Are used in the treatment of cancer b/c they can kill cancer cells. However - if powerful enough they can kill healthy cells.






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






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






20. Potential & Kinetic






21. Conduction - Convection - & Radiation






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






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






24. The region around a magnet where the magnetic force is exerted






25. Removal of static electricity by conduction






26. # of protons + # of neutrons






27. Making and breaking of chemical bonds between atoms bonds involve only the outer electrons & do not effect the nucleus






28. A heat that required to change (water from liquid to solid) from one state to another.






29. Mass of the substance contained per unit of volume






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






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






32. Carbon atom - atomic number 6 - atomic mass 11






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






34. Concave






35. They are neither precise nor accurate.






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






37. Higher because it has higher apparent frequency.






38. Heat energy that is transferred into or out of a system






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






40. Resistance is measured in...






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






42. The buoyant force on an object is equal to the weight of the fluid displaced by the object






43. 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






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






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






46. 1/10 the base unit






47. 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)






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






49. 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?






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