3) What type of change takes place in the following, physical or chemical? Briefly explain.
a) Heating of zinc oxides
b) Action of sodium with water
c) Rain cycle
d) Heating calcium carbonate
e) Action of dilute acids on magnesium
Answers
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Heating of zinc oxides is a chemical change because in this chemical change is taking place and can't be reversed as a new reactant is formed
2 is also a chemical change with same answer as 1
Rain cycle is physical change as only state of water is changing from gas to vapour to water then rain and then again evaporate
Heating caco3 is a chemical change with same answer as 1
5 th one is also same as 1 and is chemical change
The type of change ins each of the following reactions is given below:
a) Heating of zinc oxide is a physical change.
• Zinc Oxide is white in colour. When this is heated then it turns into lemony colour.
•And when the heat is taken off, zinc oxide again turns into that initial white substance.
b) Action of sodium with water is a chemical change.
• When sodium is mixed or dissolved in water, the product which are formed includes: sodium hydroxide and hydrogen gas.
• Thus reaction cannot be reversed and the initial substance sodium cannot be obtained.
c) Rain cycle is a physical change.
• The rain cycle is the cycle which changes or transforms to the physical phases: solid, liquid and gas.
• The water that undergoes cycling never changes into another substance chemically and permanently.
d) Heating calcium carbonate is a chemical change.
• When we heat CaCO3, the products that are formed are: CO2 and calcium oxide.
• The products then cannot be converted back into CaCO3 and the change is permanent.
e) Action of dilute acids on magnesium is a chemical change.
• When we add magnesium to a dilute acid, say HCl, then the products formed are: H2 gas and Magnesium chloride.
• The product MgCl2 has different properties as that of the initial substance Mg and the reaction is permanent.
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