4.2. Hydrogen–oxygen fuel cells
A subsection of Chemistry, 5070, through 4. Electrochemistry
Listing 10 of 18 questions
Water from natural sources contains dissolved substances which are not pollutants, such as mineral salts. Name another substance found naturally in water which is not a mineral salt or a pollutant. When lithium reacts with water, aqueous lithium hydroxide, LiOH, and hydrogen are formed. Construct the equation for this reaction. Sodium and potassium react with water in a similar way to lithium. Explain, in terms of their electronic configuration, why lithium, sodium and potassium all react in a similar way. Describe the trend in reactivity of the Group I elements lithium, sodium and potassium. Water and oxygen are formed when aqueous hydrogen peroxide decomposes. 2H2O22H2O+ O2Calculate the maximum volume of oxygen, at room temperature and pressure, which is produced by the complete decomposition of a solution containing 16.0 g of hydrogen peroxide. Give your answer to three significant figures. volume of oxygen dm3 A fuel cell generates electricity when hydrogen and oxygen react on platinum electrodes. Name a process used in industry to produce hydrogen. Some cars use a hydrogen–oxygen fuel cell instead of a petrol engine as a source of energy. Describe two advantages of a hydrogen–oxygen fuel cell compared with a petrol engine. 1. 2.
5070_w20_qp_22
THEORY
2020
Paper 2, Variant 2
View
Questions Discovered
18