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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. Friction opposes the motion of one surface past another - Friction is common when slowing down a car or sledding down a hill.






2. Where are protons an neutrons located?






3. Series circut - Parallel circut






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






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






6. Animals in which of the following groups may have a backbone and a spinal cord?






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






8. 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






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






10. The interference that occurs when two waves combine to make a wave with a larger amplitude






11. That for a fixed amount of gas at a constant temperature - the volume of a gas increases as its pressure decreases






12. The transfer of heat by electromagnetic waves is called?






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






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






15. 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.






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






17. 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.






18. Electrical - Light (radiant) - Heat (thermal) - Movement






19. A temperature scale with the freezing point of water 32 degrees and the boiling point of 212 degrees.






20. Is formed when 2 atoms share electrons - covalent bonding happens among non - metals.






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






22. The Earth's seasons can be attributed primarily to which of the following in conjunction with its revolution about the Sun?

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23. A nuclear reaction in which nuclei combine to form more massive nuclei with the simultaneous release of energy






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






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






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






27. Solutes that have bonds; no electrically charged species are created when they dissolve in water; glucose; lipids; urea






28. Liter is the base unit of...






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






30. 2 or more substances combine to form a compound EX. A+B -> AB






31. Is the transfer of heat with no actual transfer of matter. Ex. Iron pan of flame.






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






33. What quantity of oxygen - O2 - contains very nearly the same number of molecules as 36.0 grams of water - H2O?






34. Change from gas to liquid






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






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






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






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






39. The agent most widely and most consistently at work changing the appearance of the Earth's surface






40. A mixture containing two or more metallic elements or metallic and nonmetallic elements usually fused together or dissolving into each other when molten Ex. Brass is an alloy of zinc and copper






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






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






43. Nuclear fission - Nuclear Fusion






44. Experiments may not be done on...






45. 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






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






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






48. Way of keeping tract of valence electrons






49. 1. nuclear reaction 2. radioactive






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