{"type":"multi-choice","id":"76118","dataJson":{"key":0,"prompt":"In a closed system, the law of conservation of mass says that some mass is lost over time.","options":[{"key":"0.4632556450780001","label":"True","value":"True"},{"key":"0.3475428297692309","label":"False","value":"False"}],"limitChoices":{"max":1,"min":1},"validResponse":["False"]}}

{"type":"fill-in-blanks","id":"76119","dataJson":{"prompt":"Fill out the blanks","options":{"predict":[{"label":"understand","value":"understand"},{"label":"predict","value":"predict"},{"label":"guess","value":"guess"}],"reactant":[{"label":"reactant","value":"reactant"},{"label":"solution","value":"solution"},{"label":"product","value":"product"}],"conservation":[{"label":"conversation","value":"conversation"},{"label":"reduction","value":"reduction"},{"label":"conservation","value":"conservation"}]},"template":"The law of the {{conservation}} of mass is helpful for scientists as they can {{predict}} the amount of product made in a chemical reaction from the mass of the {{reactant}}.","validOptions":["predict","reactant","conservation"],"validResponse":{"predict":"predict","reactant":"reactant","conservation":"conservation"}}}

{"type":"multi-choice","id":"76120","dataJson":{"prompt":"Which of these chemical formulae contain 3 different atomsl? Choose 1 answer","options":[{"key":"0.11946802151784275","label":"H2O","value":"H2O"},{"key":"0.8229866087756867","label":"NaOH","value":"NaOH"},{"key":"0.733473090333532","label":"CH4","value":"CH4"},{"key":"0.24991637670139033","label":"NH3","value":"NH3"}],"limitChoices":{"max":1,"min":1,"sameNumberAsCorrectAnswers":true},"validResponse":["NaOH"]}}

{"type":"multi-choice","id":"76121","dataJson":{"prompt":"Which of the following situations does not follow the conservation of mass?(choose 1)","options":[{"key":"0.5497006480493374","label":"A candle burning","value":"A candle burning"},{"key":"0.4107643484804362","label":"Iron rusting","value":"Iron rusting"},{"key":"0.6419915424773395","label":"Mixing sodium bicarbonate and vinegar to make carbon dioxide","value":"Mixing sodium bicarbonate and vinegar to make carbon dioxide"},{"key":"0.7833734387212377","label":"None of the above","value":"None of the above"}],"limitChoices":{"max":2,"min":2,"sameNumberAsCorrectAnswers":true},"validResponse":["None of the above"]}}

{"type":"multi-choice","id":"76122","dataJson":{"prompt":"Which of these is true about why the conservation of mass is helpful.","options":[{"key":"0.17902662341463915","label":"It can help a chemist get a good job.","value":"It can help a chemist get a good job."},{"key":"0.8932496037065948","label":"It can reduce time wasted making products.","value":"It can reduce time wasted making products."},{"key":"0.5445578358847243","label":"t can help make sure that a manufacturer makes the correct amount of product","value":"t can help make sure that a manufacturer makes the correct amount of product"},{"key":"0.963052364159017","label":"It can ensure a manufacturer makes a perfect product.","value":"It can ensure a manufacturer makes a perfect product."}],"limitChoices":{"max":1,"min":1},"validResponse":["t can help make sure that a manufacturer makes the correct amount of product"]}}

Answer incorrect

Look at the slide below to work out the answer.