Marcus plans an investigation to find out which fuel makes water hotter, ethanol or propanol. Marcus burns each fuel in turn to heat the water. He measures how hot the water gets.
A. State whether the burning reactions are exothermic or endothermic. Explain your decision.
B. Name the independent variable in the investigation
C. Name two variables that Marcus must keep the same
D. Explain why he must keep these variables the same
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The question can be answered as follows:
Explanation:
- A) The burning reactions will be exothermic. This is because energy is released in an exothermic reaction. Burning of fuel will release energy and hence it is an exothermic reaction.
- B) The water will be the independent variable as it will not be changed.
- C) Two variables that Marcus should keep same are the quantity of water and the quantity of both the fuels.
- D) These variables must be kept same in order to reach a just conclusion. The quantities of the water and fuel should be equal in each scenario.
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