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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. Is the path along which electrons flow






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






3. Organic molecules that are composed of only carbon and hydrogen.






4. The amount of energy required for the liquid at its boiling point to become a gas






5. 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






6. Is the work done divided by the amount of the time it took to do it. P= w/t






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






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






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






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






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






12. Removal of static electricity by conduction






13. Is the change from liquid to gas.






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






15. Change from gas to liquid






16. Is done on an object when an applied force moves across a distance.






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






18. Liter is the base unit of...






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






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






21. (physics) a process that alters the energy or structure or composition of atomic nuclei - When a reaction involves the nucleus - elements become different thus is called a nuclear reaction.






22. You see your reflection






23. 1. Constructive 2. Destructive






24. They form only over warm oceans






25. 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






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






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






28. An electric circut with a single path






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






30. Gram is the base unit of...






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






32. Pressure is measures in a unit called






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






34. A compound of which a relatively small amount of the dissolved solute exists as ions in an aqueous solution. Example: Acetic acid - CH3COOH (vinegar)






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






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






37. Inertia is the tendency of any object to resist change in motion. An object at rest tends to stay at rest. An object that is moving tends to keep moving.






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






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






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






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






42. 1. Make more coils - 2. put an iron cover (nail) inside the coils - use more battery power






43. The center of the atom.






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






45. Negatively charged particles found outside the nucleus






46. Objects are in thermal contact if they can affect each others temperature






47. Heat transferred by direct contact






48. 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.






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






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







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