Which of the following is an example of chemical change? a.) stirring butter and sugar together b.) adding food coloring to water c.) burning a candle d.) breaking a rock into smaller pieces

C.) Burning a Candle! When the wax burns and the wax vapor near the flame burns and gives new substances like Carbon Dioxide, Carbon soot, water vapors, heat and light, it is chemical change!

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a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.