Q9: Difference between laboratory thermometer and clinical thermometer.
Q10: Give reasons:
1. Mercury is used as a liquid in a thermometer
2. While constructing house in a coastal area, in which direction should the
window preferably face and why?
3. Calamine solution is applied over skin when an any bites.
Q11: State differences between acids and bases.
Q12: Draw a well labelled diagram of digestive system of cow.
Q13: Explain with the help of an activity flow of heat through a metal strip.
Q14: Explain neutralization reaction with the help of an example.
Q15: State differences between conductors and insulators.
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Answers
Explanation:
Are you studying 7th grade
Answer:
Q.9
Clinical thermometer is used for measuring human body temperature whereas laboratory thermometer is used for measuring higher than average human body temperature.
Q. 10
1.Mercury is the only one in liquid state at room temperature. It's used in thermometers because it has high coefficient of expansion.
2.The windows of coastal areas should preferably face in the direction of sea. Because of this, 'sea breeze' will keep the house fresh and cold during day time.
3.Calamine solution is applied on the skin when an ant bites. The sting of an ant contains formic acid.As calamine solution contains zinc carbonate which is basic in nature. Therefore, when we applied it on the skin it neutralize the effect of formic acid.
Q.11
Acids dissociate to release hydrogen ions (H+) when mixed with water. Bases dissociate to release hydroxide ions (OH–) when mixed with water.Acids are sour in taste.Bases are bitter in taste.
Bases are bitter in taste.Bases do not change the colour of blue litmus.Bases turn red litmus blue.Acids do not change the colour of red litmus .Acid turn blue litmus red.
Q.14
The reaction between an acid and bases is called a neutralization reaction. The result of the reaction is salt and water. Acid + Base → Salt + Water + heat. For example, when hydrochloric acid(acid) and sodium hydroxide(base) react they form sodium chloride(salt) and water. Also, heat is evolved.
Q.15
A conductor allows current to flow easily through it. An Insulator doesn't allow current to flow through it. Electric charge exists on the surface of conductors. Electric charges are absent in insulators.