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[{"id":330251,"quiz_id":"16806","answer_id":null,"answerType_id":"0","created_at":"2017-12-02 21:24:18","updated_at":"2017-12-05 11:57:50","questionName":"A single phase system means that there is only one element in the system","questionTimeSeconds":"0","questionTimeMinutes":"20","questionImagePath":null,"position":1,"explanation":"","question_score_id":null,"lang":null,"questionAudioPath":null},{"id":330254,"quiz_id":"16806","answer_id":null,"answerType_id":"0","created_at":"2017-12-02 21:30:07","updated_at":"2017-12-05 11:57:50","questionName":"Water will always boil at 100 C","questionTimeSeconds":"0","questionTimeMinutes":"20","questionImagePath":null,"position":4,"explanation":"","question_score_id":null,"lang":null,"questionAudioPath":null},{"id":330260,"quiz_id":"16806","answer_id":null,"answerType_id":"0","created_at":"2017-12-02 21:56:15","updated_at":"2017-12-05 11:57:50","questionName":"See the figure for the binary phase diagram between Cu and Ni. ","questionTimeSeconds":"0","questionTimeMinutes":"20","questionImagePath":"uploads\/unc-charlotte-megr-3161-002-materials-test-3-study-guide\/CuNi.PNG","position":10,"explanation":"","question_score_id":null,"lang":null,"questionAudioPath":null},{"id":330262,"quiz_id":"16806","answer_id":null,"answerType_id":"0","created_at":"2017-12-02 21:58:38","updated_at":"2017-12-05 11:57:50","questionName":"The reason that Pb-Sn alloys are popular soldering alloys because ","questionTimeSeconds":"0","questionTimeMinutes":"20","questionImagePath":null,"position":12,"explanation":"","question_score_id":null,"lang":null,"questionAudioPath":null},{"id":330264,"quiz_id":"16806","answer_id":null,"answerType_id":"0","created_at":"2017-12-02 22:17:54","updated_at":"2017-12-05 11:57:50","questionName":"In the Pb-Sn system, an alloy of any composition will experience eutectic reaction at the eutectic temperature. ","questionTimeSeconds":"0","questionTimeMinutes":"20","questionImagePath":"uploads\/unc-charlotte-megr-3161-002-materials-test-3-study-guide\/PbSn.jpg","position":14,"explanation":"","question_score_id":null,"lang":null,"questionAudioPath":null},{"id":330257,"quiz_id":"16806","answer_id":null,"answerType_id":"0","created_at":"2017-12-02 21:37:50","updated_at":"2017-12-05 11:57:50","questionName":"The copper-nickel phase diagram is shown as below.","questionTimeSeconds":"0","questionTimeMinutes":"20","questionImagePath":"uploads\/unc-charlotte-megr-3161-002-materials-test-3-study-guide\/CuNi.PNG","position":7,"explanation":"","question_score_id":null,"lang":null,"questionAudioPath":null},{"id":330259,"quiz_id":"16806","answer_id":null,"answerType_id":"0","created_at":"2017-12-02 21:45:34","updated_at":"2017-12-05 11:57:50","questionName":"An alloy with 50 wt% Ni is cooled from the liquid field. As the temperature hits the liquidus line, small particles of a solid phase (\u03b1phase) start to appear. Thecomposition of the first solid-phase particles will be","questionTimeSeconds":"0","questionTimeMinutes":"20","questionImagePath":"uploads\/unc-charlotte-megr-3161-002-materials-test-3-study-guide\/CuNi.PNG","position":9,"explanation":"","question_score_id":null,"lang":null,"questionAudioPath":null},{"id":330250,"quiz_id":"16806","answer_id":null,"answerType_id":"0","created_at":"2017-12-02 21:23:21","updated_at":"2017-12-05 11:57:50","questionName":"Water must be treated as a two-component system since it is composed of two elements ","questionTimeSeconds":"0","questionTimeMinutes":"20","questionImagePath":null,"position":0,"explanation":"","question_score_id":null,"lang":null,"questionAudioPath":null},{"id":330261,"quiz_id":"16806","answer_id":null,"answerType_id":"0","created_at":"2017-12-02 21:56:52","updated_at":"2017-12-05 11:57:50","questionName":"See the Cu-Ni phase diagram. If a liquid phase containing 50% Ni is rapidly cooled into the two phase regime, then the solid phase will have __ Ni content in its core than away from the core. ","questionTimeSeconds":"0","questionTimeMinutes":"20","questionImagePath":"uploads\/unc-charlotte-megr-3161-002-materials-test-3-study-guide\/CuNi.PNG","position":11,"explanation":"","question_score_id":null,"lang":null,"questionAudioPath":null},{"id":330252,"quiz_id":"16806","answer_id":null,"answerType_id":"0","created_at":"2017-12-02 21:25:48","updated_at":"2017-12-05 11:57:50","questionName":"Graphite is thermodynamically the most stable form of carbon since ","questionTimeSeconds":"0","questionTimeMinutes":"20","questionImagePath":null,"position":2,"explanation":"","question_score_id":null,"lang":null,"questionAudioPath":null},{"id":330258,"quiz_id":"16806","answer_id":null,"answerType_id":"0","created_at":"2017-12-02 21:39:52","updated_at":"2017-12-05 11:57:50","questionName":"The copper-nickel phase diagram, as shown by the figure, has the following number of phase fields (or regions). ","questionTimeSeconds":"0","questionTimeMinutes":"20","questionImagePath":"uploads\/unc-charlotte-megr-3161-002-materials-test-3-study-guide\/CuNi.PNG","position":8,"explanation":"","question_score_id":null,"lang":null,"questionAudioPath":null},{"id":330263,"quiz_id":"16806","answer_id":null,"answerType_id":"0","created_at":"2017-12-02 22:00:33","updated_at":"2017-12-05 11:57:50","questionName":"There are __ isothermal reactions in the Mg-Pb phase diagram.","questionTimeSeconds":"0","questionTimeMinutes":"20","questionImagePath":"uploads\/unc-charlotte-megr-3161-002-materials-test-3-study-guide\/mgpb.jpeg","position":13,"explanation":"","question_score_id":null,"lang":null,"questionAudioPath":null},{"id":330253,"quiz_id":"16806","answer_id":null,"answerType_id":"0","created_at":"2017-12-02 21:29:39","updated_at":"2017-12-05 11:57:50","questionName":"Diamond is a meta-stable phase of carbon since its free energy is higher than that of graphite, but transformation from diamond to graphite is kinetically forbidden under ambient condition due to the energetic barrier for this transformation","questionTimeSeconds":"0","questionTimeMinutes":"20","questionImagePath":null,"position":3,"explanation":"","question_score_id":null,"lang":null,"questionAudioPath":null},{"id":330255,"quiz_id":"16806","answer_id":null,"answerType_id":"0","created_at":"2017-12-02 21:35:12","updated_at":"2017-12-05 11:57:50","questionName":"Adding a metal of a higher melting point into that of a lower melting point will always increase the melting point of the latter.","questionTimeSeconds":"0","questionTimeMinutes":"20","questionImagePath":null,"position":5,"explanation":"","question_score_id":null,"lang":null,"questionAudioPath":null},{"id":330256,"quiz_id":"16806","answer_id":null,"answerType_id":"0","created_at":"2017-12-02 21:35:53","updated_at":"2017-12-05 11:57:50","questionName":"An isomorphous binary system means that adding any amount of one component into the lattice of another will not change the lattice type. ","questionTimeSeconds":"0","questionTimeMinutes":"20","questionImagePath":null,"position":6,"explanation":"","question_score_id":null,"lang":null,"questionAudioPath":null}]