UCE (O-Level) Energy and chemical change — practice questions
6 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice UCE (O-Level) Energy and chemical change in the app →What happens to energy when a chemical bond is broken?In an exothermic reaction, how does the energy of the products compare with the energy of the reactants?For an endothermic reaction, what is the sign of the enthalpy change of the system?Photosynthesis absorbs energy from sunlight while it takes place. What type of reaction is it?What is the minimum amount of energy that must be supplied before a chemical reaction will start?The activated complex forms while the reactant bonds break and the product bonds form. How long does it last?