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9. the accepted value for the heat of combustion of methane is -890kj/mol. explain why the experimental data might differ from the theoretical value.
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Answer and explanation;The experimental data might differ from the theoretical value because because the Theoretical value is calculated under ideal conditions such as there  is no heat loss to the environment or surroundings, constant temperature and pressure, the use of ideal gasses and fluids etc.While on the other hand, experimental data is obtained under real environment conditions such as changing temperature and pressure, accompanied by loss of heat to the surroundings, the gases are not ideal

Let's start by using the definition of acceleration. Acceleration is defined as the change in velocity over the change in time. In equation, that would be Δvelocity/Δtime. Based on the axes of the given graph, it shows the trend of position over time. So, the slope of the line and the curve shows the change of position over change of time, Δdistance/Δtime. In physics, this is the definition of speed or velocity. So, Maia is incorrect. Both curves show the speed or velocity of the object, and not acceleration.  If the graph used a y-axis of velocity instead of position, then only at that instance, would be Maia be correct.

The difference between the two is, the straight line shows constant velocity while the curve line shows changing velocity.

Explanation: