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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. 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.






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






3. Is the work done divided by the amount of the time it took to do it. P= w/t






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






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






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






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

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8. 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






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






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






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






12. Measures the amount of matter in an object






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






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






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






16. A gelatinous sample of material from a previously unexplored marine environment is thought to be living or to be composed of recently living material. Which of the following would most clearly confirm that the material has a biological origin?






17. Stored mechanical - Nuclear - Chemical - gravitational






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






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






20. 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.






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






22. The process of heat transfer via solid contact






23. They form only over warm oceans






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






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






26. Potential & Kinetic






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






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






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






30. The region around a magnet where the magnetic force is exerted






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






32. 1. Constructive 2. Destructive






33. Meter is the base unit of...






34. Average mass of various isotopes of the element.






35. The same pathogen must be found in every person with the same disease - the pathogen must be isolated & grown in a culture - when the organism is re - introduced in an experimental animal - that animal should develop the same disease originally seen

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36. The centripetal force is provided by the high banking of the curved road & by friction between the wheels & the road.






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






38. 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.






39. The Earth's seasons can be attributed primarily to which of the following in conjunction with its revolution about the Sun?

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40. 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.






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






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






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






44. Change the chemical composition of a material - Computers can be made small enough to fit inside a plastic credit card - resistors are used to regulate volume on television or radio -






45. Pressure is measures in a unit called






46. Negatively charged particles found outside the nucleus






47. 1/10 the base unit






48. 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.






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






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