It says 8. In a similar experiment Mary Moreorlesss was to determine the loss of weight when a crucible of potassium chlorate was heated to drive off the oxygen. After finishing the experiment she concluded the potassium chlorate contained 24.0% oxygen. Why did miraculous(science teacher) give Mary a failing grade ?
%Oxygen = (3*16/molar mass KClO3*100 = ? about 39%
There could be several reasons why the science teacher gave Mary a failing grade in this experiment. Here are some possible reasons:
1. Inaccurate measurement: Mary may have made errors in measuring the weight of the crucible before and after heating, resulting in inaccurate data.
2. Contamination: Mary might have accidentally contaminated the crucible or the potassium chlorate, which could have affected the weight and oxygen content measurements.
3. Incomplete data: Mary may not have followed the experimental procedure properly or failed to record all the necessary data points, making it difficult to draw accurate conclusions.
4. Lack of precision: The measurements and calculations made by Mary may not have been precise enough to meet the required standards for the experiment.
5. Incorrect interpretation: Mary may have misinterpreted the data or misunderstood the experiment, leading to incorrect conclusions about the oxygen content in the potassium chlorate.
It is important to note that the above reasons are hypothetical and based on potential scientific criteria that the teacher might have used to assess the experiment. The actual reasoning behind the failing grade can only be determined by the science teacher themselves.
To understand why Mary received a failing grade, we need to analyze the information provided. According to the statement, Mary conducted an experiment to determine the loss of weight when a crucible of potassium chlorate was heated to drive off the oxygen. After completing the experiment, Mary concluded that the potassium chlorate contained 24.0% oxygen.
However, the statement does not mention the expected or theoretical value of oxygen content in potassium chlorate. To determine if Mary's conclusion is correct or not, we should compare her result to the accepted value. If the accepted value is significantly different from Mary's conclusion, it may have been the basis for her failing grade.
Without knowing the accepted oxygen content in potassium chlorate, we cannot determine the exact reason for Mary's grade. It is possible that Mary made an error during the experiment or misinterpreted the results. The teacher might have failed her to emphasize the importance of accurate experimental techniques and data analysis.
To get a specific answer about Mary's failing grade in this scenario, you would need to provide more information or consider the context in which the experiment was conducted.