You are given samples of the substances shown in the table the samples are labeled a b c at room temperature sample a is a solid sample b is a liquid and sample c is a gas what are the identity samples a b c hint room temperature is about 20°c

The sample a which is solid at 20°C is "Iodine"

The sample b which is liquid at 20°C is "Bromine"

The sample c which is gas at 20°C is "Chlorine"

Explanation:

Iodine : It starts melting at 113.7°C, so the solid sample found is the iodine. Iodine is present in both solid as well as in vapor state.  Basically it is kept in closed jars. Only when it reaches the temperature above the melting point is starts melting.

Bromine: It is a non metallic element that is present in the liquid state, being a member of halogen group. It is heavy, mobile and dangerous reddish brown liquid. It is corrosive in nature, when comes in contact with human tissue and causes irritation in eye when comes in contact with its vapor.

Chlorine: In room temperature it is gas, as it has weak intermolecular interaction which fails to keep the molecules closely attached.

the transfer for conduction is the heat transfering from the liquid to the spoon

the transfer for convection is the heat rising from the liquid to the air

the transfer for radiation is the heat going through the sides of the cup and to the air

at least that is what i would do