Answer: Option (A) is the correct answer.
Explanation:
It is given that the unknown substance is solid at 15 degree celsius. When further heated then heat energy breaks the bond between molecules of the solid.
As a result, temperature remains constant until all the bonds are broken down to convert the solid into liquid.
Hence, the constant 17 degree celsius temperature shows that the solid is melting and after it completely melts then it converts into liquid at 23 degree celsius.
Thus, we can conclude that the statement its melting point is 17 °C, is correct about the unknown substance.
Answer:
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Explanation:
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It prevents dust from settling on the scope and in the lenses. Also, if working in a lab, a cover can prevent contamination.
Answer:
There are different energy conversions which we encounter in day to day life. Some of them are:
1) We use chemical energy in the food to convert it into mechanical and kinetic energy which we need for walking to the school.
2) We use chemical energy to be transferred into electrical energy which is converted to light energy in our bulbs so that we can see.
3) We convert electrical energy in the toaster to thermal energy to make breakfast.