Question

Q4. Suppose a reaction were to happen in an open container in a lab. During the reaction, the scientist observes the chemicals bubble, and produce a gas. During the analysis the scientist notices that the reactants weighed 20 g when he started, and the product weighed 18 g. Explain what happened. 1. His chemical reaction defied the law of conservation of mass 2. The product destroyed mass during the reaction 3. The reactants created matter during the reaction 4. The gas that was produced was not able to be weighed since the container was open. Q5. What will weigh more when a chemical change is complete? The reactants before the chemical reaction, or the product after the reaction is complete? 1. They both will weigh the same 2. The product always weighs more than the reactant 3. The reactant will weigh more than the product 4. They both will loose mass after the reaction

Answer 1

And option '4' is correct. ie The gas that was produced was not able to be weighed since the container was open explaination : During any chemical reaction the law of conservation of mass holds go live the mass of reactant is equals to the mass of product but in this case Has gas was able to scope from the Container that is why the mass of Creactant was greater than mass of prodluct. And option it is correct, ie They both فمك اطونعم النطا