Denise was measuring the effect of temperature on the amount of dissolved oxygen that water can hold. She hypothesized that as water temperature increases, the amount of oxygen that is dissolved in water increases. Her data are shown in the table below.Water temperature (ºC)Dissolved oxygen (mg/L)512.51011.01510.2209.1258.3Which conclusion did Denise most likely write in her lab report?
Answer
A
The data did not support the hypothesis because the amount of dissolved oxygen decreased as water temperature increased.
B
The data did not support the hypothesis because the amount of dissolved oxygen increased as water temperature increased.
C
The data supported the hypothesis because the amount of dissolved oxygen decreased as water temperature increased.
D
The data supported the hypothesis because the amount of dissolved oxygen increased as water temperature decreased.
Explanation
As the water temperature rises from 5°C to 25°C, the dissolved oxygen falls from 12.5 mg/L to 8.3 mg/L. This trend is opposite to Denise’s hypothesis that warmer water would hold more dissolved oxygen, so the data did not support her hypothesis. Choice A states that conclusion.
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