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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. The amount of heat it takes to change a solid to a liquid






2. 1. nuclear reaction 2. radioactive






3. Alkaline earth metals






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






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






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






7. The mechanical energy that a body has by virtue of its motion - energy of a moving object.






8. Alkali metals






9. 1. All are solids having the appearance of metals & non - metals. 2. All are white or gray - but not shiny 3. Conduct electricity - but not as well as metals.






10. Have properties in between metals and non - metals found in groups 13-16






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






12. A piece of paper that appears blue in sunlight is illuminated solely by a red light that is passed through a green filter. What color does the paper appear under this illumination?






13. Electrons that can accept energy from outside sources and move farther away from the nucleus






14. Way of keeping tract of valence electrons






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






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






17. Is the transfer of energy by waves such as the electromagnetic waves emitted by stars the sun warms the earth by emitting radiant energy.






18. Where are protons an neutrons located?






19. 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.






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






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






22. 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)






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






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






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






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






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






28. You see your reflection






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






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






31. Experiments may not be done on...






32. Solids - gasses - and 1 liquid (Bromine)






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






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






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






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






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

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38. Removal of static electricity by conduction






39. Are small positively charged particles






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






41. Measures the amount of matter in an object






42. 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






43. # of protons + # of neutrons






44. The buoyant force on an object is equal to the weight of the fluid displaced by the object






45. When force is applied to an object it moves in a straight line and adding force can make it go faster or slow down.






46. Carbon atom - atomic number 6 - atomic mass 11






47. Used in electrical devices that have to function at temperatures too high for metals.






48. 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






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






50. The formula F=M/A is a shorthand force equals mass over acceleration. An object will not move unless the force is strong enough to move the mass.