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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. Reflects the light in one direction






2. Change from gas to liquid






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






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






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






6. # of protons + # of neutrons






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






8. 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.






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






10. The device (bell or Build) is an example of a load. A load is a device that uses energy.






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






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






13. 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.






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






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






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






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






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






19. The more energy the electrons have






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






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






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






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






24. Number of protons






25. Is the path along which electrons flow






26. 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






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






28. Harder - denser - have higher melting points & are chemically active.






29. 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






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






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






32. Is the change from liquid to gas.






33. (physics) the capacity of a physical system to do work - or supply heat.






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






35. Higher because it has higher apparent frequency.






36. Reduction in pressure of a fluid resulting from the speed increase as fluids are forced to flow faster through narrow spaces






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






38. Causes motion






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






40. Pushing a vacuum cleaner or pulling a bowstring applies muscular force when the muscles expand & contract elastic force occurs when an object returns to its original shape (for example - when a bow is released)






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






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






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






44. Resistance is measured in...






45. The state of two or more objects or substances in thermal contact when they have reached a common temperature - EX. the affects after a hot cup of coffee meeting the desk temperature.






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






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






48. Is the study of the relationship between motion & the forces affecting motion.






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






50. It is second element in group 14 - semi - conductor. Sand is made of silicon - it is also used to manufacture glass and cement.