Obi is trying to determine if a powdery, solid substance is an element or a compound. after recording some observations, he strongly heats a sample of the solid over a burner flame. after fifteen minutes, he turns off the flame and allows the sample to cool. he records his final observations in the data table. which is the best explanation of his results? the heating changed some of the sample to gas, causing the mass to decrease without breaking down the sample. therefore, the original sample is a compound. the appearance stayed the same, showing that the sample was not broken down by heating. therefore, the original substance is an element. the mass decreased during heating and some of the impurities escaped. therefore, the original substance is an element. the chemical reaction with acid changed, showing that the sample was broken down by heating. therefore, the original substance is a compound.
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Chemistry, 21.06.2019 20:30
Un cierto gas tiene un volumen de 800ml a 80°c y 600ml a 80°c y 600mmhg de presión. ¿cual será el volumen del gas a condiciones normales? sà el gas es oxÃgeno, ¿cuál será su peso? y ¿cuántas moléculas están presentes en el sistema?
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Chemistry, 22.06.2019 13:50
Read the chemical equation. 2c2h2 + 5o2 → 4co2 + 2h2o which of the following statements would be correct if one mole of c2h2 was used in this reaction? one mole of oxygen was used in this reaction. five moles of oxygen were used in this reaction. four moles of carbon dioxide were produced from this reaction. two moles of carbon dioxide were produced from this reaction.
Answers: 3
Obi is trying to determine if a powdery, solid substance is an element or a compound. after recordin...
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