Chemical experiment

For an experiment, a chemical solution starts at a temperature of 25°C, falls to −3°C, rises to 15°C and then falls again to −8°C. What is the total change in temperature? Add all the changes together for each rise and fall.

Correct answer:

Δ =  69 °

Step-by-step explanation:

t1=25 °C t2=3 °C t3=15 °C t4=8 °C  Δ1=t2t1=(3)25=28 °C Δ2=t3t2=15(3)=18 °C Δ3=t4t3=(8)15=23 °C  Δ=Δ1+Δ2+Δ3=28+18+23=69

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