UHS MDCAT 2025 Chemistryuhs mdcat chemistry 2025#First Law of Thermodynamics#Thermochemistry & Thermodynamics11Choose the best answerIf 100 kJ of heat is absorbed by the system and 40 kJ of work is done on the system what is the change of internal energy?A-60 kJB+60 kJC-140 kJD+140 kJ Like 0 Discuss 0Share
UHS MDCAT 2025 Chemistryuhs mdcat chemistry 2025#Percentage Yield#Stoichiometry12Choose the best answerConsider the given balanced chemical equation: 2H₂ + O₂ → 2H₂O. If 4 g of H₂ reacts with 32 g of O₂ to produce 28 g of H₂O, what is the percentage yield of the reaction?A63.6%B77.8%C87.5%D92.5% Like 0 Discuss 0Share
UHS MDCAT 2025 Chemistryuhs mdcat chemistry 2025#Alkanes#Chemistry of Hydrocarbons13Choose the best answerWhat is general requirement for free radical substitution reaction of ethane and halogen?Alow pressureBlow temperatureChigh pressureDheat and UV light Like 0 Discuss 0Share
UHS MDCAT 2025 Chemistryuhs mdcat chemistry 2025#Electrochemistry#Redox Reactions14Choose the best answerWhich of the following situations most clearly demonstrates a key characteristic of a Redox reaction?AWater boiling to steamBHydrogen gas reacting with chlorine to form hydrogen chloride gasCSodium chloride dissolving in waterDEthanol evaporating at room temperature Like 0 Discuss 0Share
UHS MDCAT 2025 Chemistryuhs mdcat chemistry 2025#Spontaneous Reactions#Thermochemistry & Thermodynamics15Choose the best answerMajority of reactions taking place at ordinary temperatures with -ΔH are:AEndothermicBExothermicCThermally unstableDReversible Like 0 Discuss 0Share5