1. An experiment uses a flask (100 g), a balloon (2 g), baking soda (20 g), and vinegar (50 g). What should the mass of the whole system be AFTER the reaction?

Consider the four elements above. which one of these elements will combine with oxygen in a 1: 1 ratio?

Which of your 24 wells had indications that a chemical reaction occurred? how were you able to tell that a chemical reaction occurred? which of your 24 wells had indications that a physical reaction occurred? how were you able to tell that a physical reaction occurred? report on both mixing and evaporation. make a general statement about whether your hypotheses were validated or rejected. must your hypotheses be correct for this to be a successful laboratory?

Which best describes the activation energy of a chemical reaction? a. the combined energy of all the reactants b. the amount of energy required for a reaction to occur c. the difference in energy between products and reactants d. the potential energy stored in the bonds of reactants and products