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Answer the Questions<\/p>\n","overallFeedback":[{"from":0,"to":100}],"showSolutions":"Show solution","tryAgain":"Retry","checkAnswer":"Check","notFilledOut":"Please fill in all blanks to view solution","answerIsCorrect":"':ans' is correct","answerIsWrong":"':ans' is wrong","answeredCorrectly":"Answered correctly","answeredIncorrectly":"Answered incorrectly","solutionLabel":"Correct answer:","inputLabel":"Blank input @num of @total","inputHasTipLabel":"Tip available","tipLabel":"Tip","behaviour":{"enableRetry":true,"enableSolutionsButton":true,"enableCheckButton":true,"autoCheck":false,"caseSensitive":false,"showSolutionsRequiresInput":false,"separateLines":true,"confirmCheckDialog":true,"confirmRetryDialog":false,"acceptSpellingErrors":true},"scoreBarLabel":"You got :num out of :total points","confirmCheck":{"header":"Finish ?","body":"Are you sure you wish to finish ?","cancelLabel":"Cancel","confirmLabel":"Finish"},"confirmRetry":{"header":"Retry ?","body":"Are you sure you wish to retry ?","cancelLabel":"Cancel","confirmLabel":"Confirm"},"questions":["

Is brass a mixture or a compound?*- brass is an alloy of copper and zinc*<\/p>\n","

What are the physical states of matter?*- Solids- liquids- gases- plasma*<\/p>\n","

Define atoms.*- are single units of elements - elements are materials containing only one type of atom - the atomic structure of an element determines it chemical behaviour (how it interacts with other elements)*<\/p>\n","

Define molecules.*- atoms of elements unite to form complex molecules- most matter is composed of molecules containing two or more atoms- the arrangement and structure of molecules determine the characteristics of that material*<\/p>\n","

Can all forms of matter be changed from one physical state to another and then be returned to its original state?*No, many substances cannot change from one physical state to another without becoming permanently unrecognizable*<\/p>\n","

Define volume.*- indicates the mass of a body in a given volume = mass \/ volume*<\/p>\n","

What are the reference materials for a specific gravity of?*-solids and liquids-gases*<\/p>\n","

Define cohesive forces and adhesive forces.*- mass is a measurement of the quantity of material in a body- all objects that have mass are attracted to each other. The force of attraction is called gravity- the force of gravity acting on an object is called weight*<\/p>\n","

What are the main characteristics of a solid?*-maintain their own shape without a container - compared and selected based on their properties 1. mechanical 2.physical 3. chemical*<\/p>\n","

Define the term ultimate strength.*the point at which a material ruptured due to applied forces, which may be tensile, compressive, shear<\/strong>- when materials are close to their ultimate strength, they must be reinforced*<\/p>\n","

Define the term tensile strength.*the ability of a material to resist being pulled apart by external forces- Ultimate tensile strength (UTS) is the maximum amount of stress the material can withstand before breaking*<\/p>\n","

Define the term compressive strength.*the ability to resist external forces that push into or against the material- Ultimate compressive strength (UCS) is the maximum compressive strength that a material can withstand before its surface area changes*<\/p>\n","

Define the term shear strength.*- the ability to resist forces that try to slide part of the object along itself - Ultimate shear strength (USS) is the maximum stress the material can withstand before its cut apart. - USS of a material is about 40% of its UTS*<\/p>\n","

Define the term fatique strength.*- the ability to withstand repeatedly alternating stresses*<\/p>\n","

Define the term elasticity.*- the ability of a material to return to its original dimensions after it has been acted on by a force - all solids have some elasticity*<\/p>\n","

Define the term elastic limit (or yield strength).*- the maximum force that a solid can withstand without being permanently deformed*<\/p>\n","

Define the term plasticity.*- the ability for material to retain a shape permanently after deforming force is removed*<\/p>\n","

Define the term ductility.*- the ability to stretch and maintain a new shape*<\/p>\n","

Define the term malleability,*- the ability of a material to be permanently deformed by compression forces*<\/p>\n","

Define the term brittleness.*-the absence of malleability- brittle materials break without noticeable plastic deformation*<\/p>\n","

Define the term toughness.*- the ability of a material to withstand shock loads*<\/p>\n","

Define the term hardness.*- electrical conductivity- thermal conductivity- expansion and contraction*<\/p>\n","

What are the chemical properties of solids?*- composition- corrosion resistance-electrochemical reaction (electrolysis)*<\/p>\n","What effect does electrolysis have on metals?*-when two different metals are in contact with one another and there is water present, an electric current is produced - The electron flow has a chemical effect, corroding the metals. It may even disintegrate on of them.*\n","What is the galvanic series with regard to metals?*- list of metals in which each metal is corroded by all those metals listed after it*\n","Describe the properties of liquids.*- cohesion- adhesion- volatility- viscosity*\n","Describe the properties of gases and compare them to the properties of liquids.*- compressibility- elasticity- the combination of compressibility and elasticity in confined gases is called resilience*\n","How is the pressure of gases measured?*- Gas pressure may be measured by means of a gauge- psig- psia- atm- bar*\n","Describe internal energy.*- a materials molecules are in constant, random motion. This molecular movement is an energy form called thermal energy, or, more correctly, internal energy*\n","Define heat.*- heat is the energy in transit from a body at a higher temperature to a body at a lower temperature*\n","

Name the instruments used to measure temperature.*the amount of heat needed to change the temperature of 1 lb of water by 1 degree Fahrenheit*<\/p>\n"],"a11yCheck":"Check the answers. The responses will be marked as correct, incorrect, or unanswered.","a11yShowSolution":"Show the solution. The task will be marked with its correct solution.","a11yRetry":"Retry the task. Reset all responses and start the task over again.","a11yCheckingModeHeader":"Checking mode"}