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






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






3. Describes the force of friction of 2 surfaces that are in contact but do not have any motion relative to eachother.






4. Concave






5. Way of keeping tract of valence electrons






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






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






8. Liter is the base unit of...






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






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






11. Parts of 2 compounds replace each other. Ex. Switch partners AX + BY -> AY + BX






12. (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.






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






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






15. Experiments may not be done on...






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






17. '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






18. 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.






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






20. Gram is the base unit of...






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






22. Equal volumes of gases at the same temperature and pressure contain equal numbers of particles






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






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






25. They are neither precise nor accurate.






26. 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.






27. 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.






28. The relationship between voltage - current - and resistance - V=IR






29. 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.






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

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31. Finding that a solution conducts an electric current shows conclusively that the solution...






32. When you step out of the shower the floor feels colder on your feet than the bathmat. Because heat is ______________ to the floor.






33. The energy released by a nuclear reaction - binding energy is released when the nuclei of atoms are split apart in a nuclear reaction this binding energy is called nuclear energy.






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






35. 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






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






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






38. 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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39. 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.






40. Solutes that have bonds; no electrically charged species are created when they dissolve in water; glucose; lipids; urea






41. Heat transferred by direct contact






42. Inertia is the tendency of any object to resist change in motion. An object at rest tends to stay at rest. An object that is moving tends to keep moving.






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






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






45. Substance that dissociates completely into its ions when added to water and conducts electricity well.






46. You see your reflection






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






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






49. Heat absorbed or radiated during a change of phase at a constant temperature and pressure - the amount of heat required to undergo a phase change






50. Are small positively charged particles






Can you answer 50 questions in 15 minutes?



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