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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. 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.






2. Potential & Kinetic






3. They are neither precise nor accurate.






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






5. Measures the amount of matter in an object






6. Pressure is measures in a unit called






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






8. Heat transferred by direct contact






9. Finding that a solution conducts an electric current shows conclusively that the solution...






10. Alkali metals






11. 1. Like charges repel one another - 2. Opposite charges attract each other - 3. charge is considered a neutral object has no net charge.






12. The center of the atom.






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






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






15. Mass of the substance contained per unit of volume






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






17. Reduction in pressure of a fluid resulting from the speed increase as fluids are forced to flow faster through narrow spaces






18. Record vibrations in earth & allow us to measure earthquake activity.






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






20. 1. Constructive 2. Destructive






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






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






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






24. Gram is the base unit of...






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






26. 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.






27. 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.






28. 1000x the base unit






29. Reflects the light in one direction






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






31. Way of keeping tract of valence electrons






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






33. Is the change from liquid to gas.






34. Heat transferred by fluid current






35. 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.






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






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






38. 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.






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






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






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






42. # of protons + # of neutrons






43. Have properties in between metals and non - metals found in groups 13-16






44. The branch of physics that deals with static electricity - study of stationary electric charges.






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






46. P1/T1=P2/T2. States that the pressure of a fixed amount of gas in a fixed volume is proportional to its temperature.

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47. Series circut - Parallel circut






48. Average mass of various isotopes of the element.






49. According to some scientists - the Earth's average surface temperature is rising as a result of the greenhouse effect. An increase in the atmospheric concentration of which of the following gases is considered to be primarily responsible






50. The molecular weight of a substance expressed in grams - measures the amount of a substance