Answer:
In a science lab, a teacher instructed students to attach a piece of very fine steel wool to a clamp stand inside a fume hood. The students then lit a burner placed under the steel wool. The metal strands began to glow bright red and flames filled the steel wool. After the burner was turned off, the metal continued to burn, leaving behind reddish-brown strands that collapsed into a powder when it was touched after cooling.
Based on these observations, did the steel wool undergo a chemical change or a physical change? Explain your answer.
Explanation:
A cake under goes chemical change
Magnesium is more reactive than copper so magnesium can displace copper from of its salt solution.
CuSO4 (aq) + Mg (s) ------> MgSO4 (aq) + Cu(s)
Complete Question
The complete question is shown on the first question
Answer:
a) The duty of the heat exchanger is given as 6.8658 KJ /sec
b) The temperature of the water leaving the exchanger is TOUT = 29.84 ⁰C
c) The log mean difference is given as TZ = 47.317 ⁰ C
d) the UA value is UA = 145.10
Explanation:
The explanation is uploaded on the first and second ,third and fourth image