answer the following questions please answer correct please tomorrow exam
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1.Mouth has salivary glands which secrete a transparent chemical substance,saliva.The saliva is mixed with the food while chewing with the help of tongue.The saliva digests the starch or carbohydrates in the mouth.Therefore the digestion of starch or carbohydrates takes place in the buccal cavity(mouth)due to the action of saliva (chemical reaction with the swallowed food)with the help of tongue...
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4)Conductors of heat are those which allow the transfer of heat whereas insulators are those which do not allow the transfer of heat.They both are useful to us in many ways like copper which is a good conductor of heat is used in cooking vessels.the handles of cooking vessels are made of insulators like wood plastic etc
5)A chemical formula represents one molecule of an element or a compound.
The chemical formula of a compound is derived by the elements and their number which is written down of the elements name as subscript
2)Expansion is one of the effects due to heat.Matter in all forms are expanded when they are heated. Ex:-Solids.:-In steel bridges spaces are given between sections to allow them to expand.
Liquids:-When u heat the thermometer the mercury in it expands.mercury is a liquid.
Gases:-take a empty flask tightly cover it with one holed cork and fix narrow tube to the cork.
invert the flask and dip the free end of the tube in to a beaker of water. Heat the flask,,,,, u will observe bubbles in the water as the air in the flask is expanded and escaped from the tube.
3) acids are used as toilet cleaners and used in laboratories.
bases are used as soaps, surf, hand wash,washing soda etc
If ur helped by my answer pls mark me as brainliest.plsssss
5)A chemical formula represents one molecule of an element or a compound.
The chemical formula of a compound is derived by the elements and their number which is written down of the elements name as subscript
2)Expansion is one of the effects due to heat.Matter in all forms are expanded when they are heated. Ex:-Solids.:-In steel bridges spaces are given between sections to allow them to expand.
Liquids:-When u heat the thermometer the mercury in it expands.mercury is a liquid.
Gases:-take a empty flask tightly cover it with one holed cork and fix narrow tube to the cork.
invert the flask and dip the free end of the tube in to a beaker of water. Heat the flask,,,,, u will observe bubbles in the water as the air in the flask is expanded and escaped from the tube.
3) acids are used as toilet cleaners and used in laboratories.
bases are used as soaps, surf, hand wash,washing soda etc
If ur helped by my answer pls mark me as brainliest.plsssss
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