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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. Gram is the base unit of...






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






3. Experiments may not be done on...






4. 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.






5. 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






6. 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.






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






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






9. Way of keeping tract of valence electrons






10. 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






11. 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)






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






13. The property of sound that varies with variation in the frequency of vibration.






14. Uses electrical charges of molecules to separate them according to their size the molecules such as DNA or proteins - are pulled through a gel towards either the positive end of the gel box.






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






16. They form only over warm oceans






17. Decibels






18. A circut with two or more resistors where the electricity has more than one path to travel






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






20. A nuclear reaction in which a massive nucleus splits into smaller nuclei with the simultaneous release of energy






21. States that when 2 objects collide in an isolated system the total momentum of 2 objects after the collision. That is the momentum gained by object.






22. 2 or more substances combine to form a compound EX. A+B -> AB






23. Negatively charged particles found outside the nucleus






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






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






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






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






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






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






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






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






32. SI unit of temperature; indicates number of units above absolute zero. To go from Celsius to Kelvin add 273. To go from Kelvin to Celsius subtract 273.






33. 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.






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






35. A boulder is sitting at the edge of the cliff it has which type of energy?






36. 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.






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






38. 10x the base unit






39. A mixture containing two or more metallic elements or metallic and nonmetallic elements usually fused together or dissolving into each other when molten Ex. Brass is an alloy of zinc and copper






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






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






42. Conduction - Convection - & Radiation






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






44. Discovered in the late 1800s that micro organisms play a casual role in onset of a disease






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






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






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






48. Clustered regions of aligned magnetic atoms. When these regions are aligned with one another - the substance containing them is a magnet.






49. Electronic equipment that provides visual images of varying electrical quantities - Useful in studying waves b/c it gives a picture of the wave.






50. 1. nuclear reaction 2. radioactive