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






3. 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






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






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






6. A heat that required to change (water from liquid to solid) from one state to another.






7. 1/1000 the base unit






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






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






10. 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






11. 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.






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






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






14. Is the transfer of heat with no actual transfer of matter. Ex. Iron pan of flame.






15. Meter is the base unit of...






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






17. Discovered in the late 1800s that micro organisms play a casual role in onset of a disease






18. The speed of light changes in different materials this is due to__






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






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






21. F - branch of chemistry that deals with the chemical action of electricity and the production of electricity by chemical reactions






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






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






24. '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






25. Experiments may not be done on...






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






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






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






29. Number of protons






30. The amount of energy required for the liquid at its boiling point to become a gas






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






32. 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.






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






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






35. The more energy the electrons have






36. Causes motion






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






38. An electric circut with a single path






39. Do not have molecules with one of the two molecular arrangements required to give an odor






40. 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 -






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






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

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






44. Higher because it has higher apparent frequency.






45. 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.






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






47. Mass of the substance contained per unit of volume






48. 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.






49. Friction opposes the motion of one surface past another - Friction is common when slowing down a car or sledding down a hill.






50. The property of sound that varies with variation in the frequency of vibration.