An unknown compound is suspected to be a carbonate. What kind of chemical should be added to the compound to test this theory?​

The correct answer is - acid.

Explanation:

The presence of carbonate in a solid or aqueous solution can be detected with the help of a chemical. This chemical is acid which is added to the compound or solution in a dilute form that leads to the formation of the bubbles of the carbon dioxide gas.

Carbonate ions react with the acid and form carbon dioxide gas that can be confirmed by Limewater. Thus, the correct answer is - acid.

answer: semi-infinite solid initially at a uniform temperature of 400 ◦c is cooled at its surface by convection. the cooling fluid at a constant temperature of 200 ◦c has a convective coefficient (ha) of 250 w/m2.k. the physical properties of the solid: k = 20 w/m.k and α = 4 * 10-5  m2/s. using δx = 0.04 m and δt = 10 s. write the finite difference equations describing the transient heat transfer of the first five δx and the temperature profile after 30 s.