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






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






3. 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.






4. Meter is the base unit of...






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






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






7. All processes cease when temperature approaches 0.






8. Higher because it has higher apparent frequency.






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






10. Pressure is measures in a unit called






11. 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.






12. Mass & weight are not the ____ quality






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






14. Resistance is measured in...






15. 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






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






17. The centripetal force is provided by the high banking of the curved road & by friction between the wheels & the road.






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






19. Are small positively charged particles






20. The process of heat transfer via solid contact






21. Liter is the base unit of...






22. Stored mechanical - Nuclear - Chemical - gravitational






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






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






25. Change from gas to liquid






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






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






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






29. Change in the apparent frequency of a wave as observer and source move toward or away from each other






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






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






32. The object is further than one focal length from the lens






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






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






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






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






37. Is the change from liquid to gas.






38. Group 17; contains nonmetals; 7 electrons in its outermost energy level; very reactive; poor conductors of electric current; never in its uncombined form in nature; combine with most metals to form salts






39. 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






40. 1. nuclear reaction 2. radioactive






41. 8 electrons






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






43. 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.






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






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






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






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






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






49. A Compound breaks down into 2 or more simpler substances EX. AB -> A+B






50. The speed of light changes in different materials this is due to__