Answer:
Q = 450 J
Explanation:
Given that,
Mass of a piece of glass, m = 45 g
The temperature changes from 10°C to 30°C.
The specific heat is 0.5 J/g°C
We need to find heat required to raise the temperature. The formula that is used to find it is given by :

So, the required heat is 450 J. Hence, the correct option is (c).
Answer:
For CH3Br, there are a total of 14 valence electrons. Hydrogen always goes on the outside, and since Carbon is less electronegative than Bromine, we'll put the Carbon in the center and the Bromine on top. We have 14 valence electrons for the CH3Br Lewis structure. Put two between atoms to form chemical bonds.
Explanation:
Answer: The correct option is - The reaction container is cold.
Explanation: Endothermic reaction is a reaction in which the system absorbs energy from the surroundings, generally in the form of heat.
In this process, the surrounding becomes cold after loosing energy.
And here, the surrounding is reaction container and hence, will become cold by loosing its energy to the reaction mixture.