Answer:
She should have first notified the teacher.
Answer:
The heat of the reaction is <em>17.94 J.</em>
Explanation:
mass of Ca (m) = 0.339 g
increase in temperature (∆T)= 11°C
specific heat (s)= 4.184 J/(g. °C)
Now, to calculate the total heat we will have to multiply the mass with specific heat and increase in temperature.
∆H = m × s × ∆T
= 0.339 × 4.184 × 11
= 17.94 J
Aluminum is more reactive than iron
but it forms Al-oxide, that form a thin layer on the surface of Al, and protect Al from reaction with water.
Answer: Very unreactive aluminum oxide forms a thin layer on aluminum.
Answer:
Yes,a plane mirror can form a real image. A plane mirror can form a real image only for a virtual object. These converging rays of incidents light after reflection intersect at a point to give a real image.
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Coal is extracted by mining.
Once coal has been extracted, it can be used directly for heating and industrial processes or to fuel power plants for electricity.
Benefits are:
Coal energy is an affordable energy source because of the coal's stable price compared to other fuel sources.
Coal is easy to burn.
Coal produces high energy upon combustion.
Coal energy is inexpensive.