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






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






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






4. 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?






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






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






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






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






9. 1000x the base unit






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






11. Force of attraction that holds atoms together - when atoms are bonded chemically they give up their individual properties.






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






13. 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.






14. The amount of energy that it takes to raise one gram of water one degree celsius.






15. Energy is added to a system one of two things must happen either thermal energy must increase or work must be done.






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






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






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






19. Measures the amount of matter in an object






20. Animals in which of the following groups may have a backbone and a spinal cord?






21. All processes cease when temperature approaches 0.






22. Metal - nonmetals - & metalliods






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






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






25. '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






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






27. Electrons in the outermost energy level; they are involved in bond formation






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






29. Number of protons






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






31. Is the path along which electrons flow






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






33. 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






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






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






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






37. A mixture containing two or more metallic elements or metallic and nonmetallic elements usually fused together or dissolving into each other when molten Ex. Brass is an alloy of zinc and copper






38. Mass & weight are not the ____ quality






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






40. Heat transferred by direct contact






41. Alkali metals






42. Pressure is measures in a unit called






43. (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.






44. The principle of conservation of energy: Energy can be transferred and transformed - but it cannot be created or destroyed.






45. The theory that all matter is composed of particles (atoms and molecules) moving constantly in random directions






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






47. 1. Liquid crystals - when certain solids melt their crystal lattices disintegrate & their particles lose their 3- dimensional pattern. 2. Solid - as a liquid substance cools & forms a solid. The strong attractive forces between oppositely charges ion






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






49. They are neither precise nor accurate.






50. 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.