Which of the following are examples of a chemical change? coffee brewing water b

Question

Which of the following are examples of a chemical change? coffee brewing water boiling nails rusting salt dissolves in water None of the above are chemical changes. How many significant figures are in the measurement, 0.009021100 g? 4 5 6 7 8 Read the temperature on the thermometer to the right with the correct number of significant figures. 87 degree C 87.2 degree C 87.20 degree C 87.200 degree C 87.2000 degree C Which one of the following is an exothermic process? ice melting water evaporating boiling soup condensation of water vapor Ammonium thiocyanate and barium hydroxide are mixed at 25 degree C: the temperature drops. An ion has 8 protons, 9 neutrons, and 10 electrons. The symbol for the ion is _______.^17O^2-^17O^2+^19F^+^19F^-^17Ne^2+

Explanation / Answer

Ans 1. c) Nails rusting

Nails are made up of rain . This iron reacts with oxygen present in the air and moisture to form red iron oxide, on its surface , the process is called as rusting of iron . It is a chemical process , basically a redox reaction of iron . The rust formed has oxides and hydroxides of iron .

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