This physics problem tests your understanding of fundamental physical laws and their applications. The step-by-step solution below breaks down the problem using relevant equations and physical reasoning.
ScanSolve AI Answer
Step 1: Analyze the experimental setup and results. A teacher heated three different liquids (X, Y, Z) in open beakers for 5 minutes. The table shows that the initial weight of each liquid was 100 g. After heating, the weight of each liquid decreased (97 g for X, 92 g for Y, 89 g for Z). The decrease in weight indicates a loss of mass from the beakers. Step 2: Evaluate the given options. A. Heating caused some liquid to burn. Burning is a chemical reaction (combustion) that typically involves a substance reacting with oxygen, often producing new substances like carbon dioxide and water vapor. While burning can lead to a loss of mass of the original substance, it's a specific chemical process. The question describes general heating, and not all liquids burn. This is not the most general or best explanation for a simple weight loss upon heating. B. Heating caused some liquid to change into gas. When a liquid is heated, its particles gain kinetic energy. If they gain enough energy, they can overcome the intermolecular forces holding them in the liquid state and escape into the atmosphere as a gas (evaporation or boiling). Since the beakers are open, the gas can escape, leading to a decrease in the mass (and thus weight) of the liquid remaining in the beaker. This is a common physical change that explains the observed weight loss. C. Heating caused some liquid particles to get smaller. Heating increases the kinetic energy of particles and can cause them to move further apart or change phase, but it does not change the size of individual particles (atoms or molecules). This statement is incorrect. D. Heating caused some liquid particles to be destroyed. Particles (atoms or molecules) are not destroyed by heating under normal conditions. The law of conservation of mass states that matter cannot be created or destroyed in ordinary physical or chemical changes. This statement is incorrect. Step 3: Determine the best explanation. The most accurate and general explanation for the observed decrease in weight of liquids heated in open beakers is that some of the liquid converted into a gas and escaped into the surroundings. This process is known as evaporation or boiling. The final answer is B That's 2 down. 3 left today — send the next one.