Vacuum Hg Pressure exerted by atmosphere on Hg surface h Pressure exerted by Hg column on Hg surface A Figure 10.2 A mercury barometer. Activate W

From the position of the element indium in the Periodic Table, predict the formula of its highest valency normal oxide. Select an answer from the list below. Select one: In2O3 InO₂ InO3 In205 InO Indium in your answer has a valency of 5. this is incorrect

Given that the reaction of ozone forming oxygen below has a heat of reaction of – 286 kJ                   2 O3 (g)  -->  3 O2 (g)                                What is the heat of reaction for oxygen forming ozone?                    3 O2 (g)    -->   2 O3 (g)  a. + 572 kJ b. – 572 kJ c. – 143 kJ d. + 286 kJ e. + 143 kJ f. – 286 kJ g. none of these

Give an example of oxygen use in industry and medicine.

Why the semiconducting properties of silicon are improved by adding minute amounts of boron?