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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. Uses percent light absorbance to measure a color change - thus giving qualitative data using quantitative value - measures light intensity as a function of color - or more specifically - the wavelength of light.






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






3. The ability of the material to oppose the flow of electrons through it all






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






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






6. 'An object at rest will remain at rest - and an object moving at a constant velocity will continue moving at a constant velocity - unless it is acted upon by an unbalanced force.' Another name is Law of Inertia






7. 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






8. 10x the base unit






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






10. Mass of the substance contained per unit of volume






11. Non - metals - group 18 - the most non - reactive elements






12. Decibels






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






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






15. 2 or more substances combine to form a compound EX. A+B -> AB






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






17. A free element replaces an element that is a part of a compound. Ex. A +BX -> AX + B






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






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






20. Submarines - diving weighting system - naval architecture - Flotation - Buoyancy compensator






21. An object's _____ gives it resistance to change its current state of motion it is also the measure of an objects resistance to acceleration.






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






23. Alkali Metals are the most _____________






24. 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






25. According to some scientists - the Earth's average surface temperature is rising as a result of the greenhouse effect. An increase in the atmospheric concentration of which of the following gases is considered to be primarily responsible






26. Force of attraction that holds atoms together - when atoms are bonded chemically they give up their individual properties.






27. Number of protons






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






29. Two or more simple machines working together EX. wheelbarrow it uses level - wheel & axle.






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






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






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






33. The more energy the electrons have






34. 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.






35. Gram is the base unit of...






36. Alkaline earth metals






37. Symmetry - crystalline structures are universal - Crystallographic defects - Electrical properties - crystal system






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






39. Uses the principles of capillary action to separate substances such as plant pigments molecules of a larger size will migrate up the paper more quickly produce lines of pigment. - a process used for separating mixtures by virtue of differences in abs






40. The monovalent group - OH in such compounds as bases and some acids and alcohols. Makes the molecule polar which increases the solubility of a compound.






41. A principle that states that for every action there is an equal reaction in the opposite direction

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






43. P1/T1=P2/T2. States that the pressure of a fixed amount of gas in a fixed volume is proportional to its temperature.

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






45. Experiments may not be done on...






46. Small uncharged particles in the nucleus they are neutral






47. An electric circut with a single path






48. Potential & Kinetic






49. Metal - nonmetals - & metalliods






50. The sum of the protons and neutrons







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