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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. 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






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






4. A heat that required to change (water from liquid to solid) from one state to another.






5. Alkaline earth metals






6. 1.) Protons 2.) Neutrons - They both have the same mass - but neutrons have no mass.






7. Measure of the disorder or randomness of the particles that make of a system (measurement of movement of particles in a spontaneous reaction) EX. entropy increases as matter and energy in the universe degrade to an ultimate state of inert uniformity.






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






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






10. Negatively charged particles found outside the nucleus






11. Solid has a definite shape and volume - Liquid has definite volume - but no shape - Gas has no shape of volume.






12. Resistance is measured in...






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






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






15. Higher because it has higher apparent frequency.






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






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






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






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






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






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






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






23. Inclined plane - lever - wheel & axle - pulley.






24. Concave






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






26. An isotope has a different number of...






27. 8 electrons






28. Gram is the base unit of...






29. The volume of a gas is directly proportional to the temperature of a gas






30. It is the first element in group 13 - is a poor conductor of electricity at low temperature - however if temperature increases it will become a good conductor.






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






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






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






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






35. 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.






36. Polar molecules






37. The energy released by a nuclear reaction - binding energy is released when the nuclei of atoms are split apart in a nuclear reaction this binding energy is called nuclear energy.






38. 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






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






40. Uses sound waves to locate objects and is especially useful underwater the sound waves bounce off the object and are used to assist in location






41. Which of the following parts of the Sun is easily visible only during a total solar eclipse






42. They form only over warm oceans






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






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






45. 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.






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






48. The center of the atom.






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






50. Describes the force of friction of 2 surfaces that are in contact but do not have any motion relative to eachother.







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