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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. Carbon atom - atomic number 6 - atomic mass 11






2. 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






3. The interference that occurs when two waves combine to make a wave with a smaller amplitude






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






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






6. Liter is the base unit of...






7. 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






8. Small uncharged particles in the nucleus they are neutral






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






10. A functional group consisting of a sulfur atom bonded to a hydrogen atom (






11. Mass & weight are not the ____ quality






12. Measure of the earth's pull






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






14. The sum of the protons and neutrons






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






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






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






18. Lacking affinity for water. Repels water. Non - polar






19. Concave






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






21. 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.






22. 100x the base unit






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






25. Consists of frequency (f) - measured in hertz - and wavelength measured in meters - the frequency times the wavelength of every electromagnetic wave equals the speed of light.






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






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






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






29. The total entropy of a system plus that of its surroundings always increase.






30. The more energy the electrons have






31. Way of keeping tract of valence electrons






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






33. Is the measure of energy temperature is a measure of the heat in an object.






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






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






36. The mechanical energy that a body has by virtue of its motion - energy of a moving object.






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






38. They form only over warm oceans






39. A functional group consisting of a phosphorus atom covalently bonded to four oxygen atoms. Ideal for energy transfer reactions (ATP).






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






41. 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.






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






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






44. Mass of the substance contained per unit of volume






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






46. Are small positively charged particles






47. 2 or more substances combine to form a compound EX. A+B -> AB






48. A gelatinous sample of material from a previously unexplored marine environment is thought to be living or to be composed of recently living material. Which of the following would most clearly confirm that the material has a biological origin?






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






50. 8 electrons