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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. Experiments may not be done on...






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






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






4. 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.






5. 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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6. 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.






7. Electrons in the outermost energy level; they are involved in bond formation






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






9. Shiny - softer & less dense. Mostly chemically active






10. 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.






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






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






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






14. Most directly involved with controlling levels of sugar in blood






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






16. Series circut - Parallel circut






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






18. Excess energy is released into the environment






19. Conduction - Convection - & Radiation






20. 1000x the base unit






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






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






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






24. 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.






25. The total entropy of a system plus that of its surroundings always increase.






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






27. Rotate at very high speed in order to separate the liquids from the solids. The more dense part of the solution will sediment at the bottom of the test tube. while the lighter material will stay on top. Ex. centrifuge is used to separate blood from b






28. A wave in which the particles move parallel to the path of the wave






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






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






31. 100x the base unit






32. Ratio of the density of a substance to the density of water






33. Lacking affinity for water. Repels water. Non - polar






34. What are the # of protons in the nucleus of an atom called?






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






36. 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






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






38. 1/10 the base unit






39. Nuclear fission - Nuclear Fusion






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






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






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






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






44. Change from gas to liquid






45. 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)






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






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






48. 10x the base unit






49. 1. Constructive 2. Destructive






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