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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. Pressure is measures in a unit called






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






3. They form only over warm oceans






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






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






6. It is second element in group 14 - semi - conductor. Sand is made of silicon - it is also used to manufacture glass and cement.






7. 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.






8. Causes motion






9. 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.






10. (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.






11. Removal of static electricity by conduction






12. Making and breaking of chemical bonds between atoms bonds involve only the outer electrons & do not effect the nucleus






13. 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.






14. Conduction - Convection - & Radiation






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






16. 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.






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






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






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






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

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






22. 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.






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






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






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






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






27. 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)






28. 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.






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






30. Measure of the earth's pull






31. The branch of physics that deals with static electricity - study of stationary electric charges.






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






33. Have properties in between metals and non - metals found in groups 13-16






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






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






36. 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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37. They are neither precise nor accurate.






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






39. Are used in the treatment of cancer b/c they can kill cancer cells. However - if powerful enough they can kill healthy cells.






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






41. A carbon atom linked by a double bond to an oxygen atom. - c=o.






42. 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






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






44. 2 or more substances combine to form a compound EX. A+B -> AB






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






46. 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






47. Is an atom that has all of its electrons in the lowest possible energy levels






48. As the velocity of a fluid increases - the pressure exerted by the fluid decreases - The speed of a fluid - liquid - gas - increases the pressure exerts.






49. Average mass of various isotopes of the element.






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







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