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






2. You see your reflection






3. Heat absorbed or radiated during a change of phase at a constant temperature and pressure - the amount of heat required to undergo a phase change






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






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






6. 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






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






8. Two or more simple machines working together EX. wheelbarrow it uses level - wheel & axle.






9. ______ of an atom is equal to the # of protons plus the # of protons plus the # of neutrons






10. The device (bell or Build) is an example of a load. A load is a device that uses energy.






11. 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.






12. The property of sound that varies with variation in the frequency of vibration.






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






14. Compounds that speed up chemical reactions. Sometimes without Catalysts reactions cant occur.






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






16. Average mass of various isotopes of the element.






17. Liter is the base unit of...






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






19. Potential & Kinetic






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






21. Is a simple device used to indicate the existence of a positive or negative charge.






22. Is the transfer of energy by waves such as the electromagnetic waves emitted by stars the sun warms the earth by emitting radiant energy.






23. Gram is the base unit of...






24. Atoms with an equal # of protons and electrons.






25. Pressure is measures in a unit called






26. A wave in which the particles of the medium move perpendicularly to the direction the wave is traveling






27. 1/1000 the base unit






28. Alkaline earth metals






29. Equal volumes of gases at the same temperature and pressure contain equal numbers of particles






30. Is the path along which electrons flow






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






32. Is the change from liquid to gas.






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






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






35. An electric circut with a single path






36. 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.






37. The acceleration of an object depends on the mass of the object and the amount of force applied.






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






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






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






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






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






43. Decibels






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






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






46. The principle of conservation of energy: Energy can be transferred and transformed - but it cannot be created or destroyed.






47. Heat transferred by direct contact






48. The theory that all matter is composed of particles (atoms and molecules) moving constantly in random directions






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






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