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






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






4. Negatively charged particles found outside the nucleus






5. Are small positively charged particles






6. 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.






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






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






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






10. Several vehicles - initially at a complete stop - begin a long race at the same starting point. The vehicle that has a constant value for which of the following is most likely to win?






11. Reflects the light in one direction






12. Higher because it has higher apparent frequency.






13. Gram is the base unit of...






14. 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






15. It scatters light in many directions






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






17. 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?






18. 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.






19. A compound of which a relatively small amount of the dissolved solute exists as ions in an aqueous solution. Example: Acetic acid - CH3COOH (vinegar)






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






21. 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.






22. 'An object at rest will remain at rest - and an object moving at a constant velocity will continue moving at a constant velocity - unless it is acted upon by an unbalanced force.' Another name is Law of Inertia






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






24. Metal - nonmetals - & metalliods






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






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






27. You see your reflection






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






29. Organic molecules that are composed of only carbon and hydrogen.






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






31. The difference in electrical charge between two points in a circuit expressed in volt. When an electron goes through a load it does work & loses some energy.






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






33. (physics) a process that alters the energy or structure or composition of atomic nuclei - When a reaction involves the nucleus - elements become different thus is called a nuclear reaction.






34. The object is further than one focal length from the lens






35. # of protons + # of neutrons






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






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






38. A unit of heat equal to the amount of heat required to raise the temperature of one kilogram of water by one degree at one atmosphere pressure. used by nutritionists to characterize the energy - producing potential in food






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






40. Mass of the substance contained per unit of volume






41. 1. Make more coils - 2. put an iron cover (nail) inside the coils - use more battery power






42. Record vibrations in earth & allow us to measure earthquake activity.






43. Causes motion






44. 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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45. The center of the atom.






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






47. Heat transferred by direct contact






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






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






50. 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.







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