For the open cup reaction, the results show conservation of mass because the total mass of the reactants (5g baking soda + 15g vinegar = 20g) is equal to the total mass of the products (18g). This indicates that no mass was lost or gained during the reaction.
For the zipped plastic bag reaction, the results also show conservation of mass because the total mass of the reactants (5g baking soda + 15g vinegar = 20g) is equal to the total mass of the products (20g). This indicates that no mass was lost or gained during the reaction.
In both cases, conservation of mass is demonstrated because all the reactants were accounted for in the products. This is consistent with the law of conservation of mass, which states that mass cannot be created or destroyed in a chemical reaction, only rearranged.
A student conducts an experiment of baking soda reacting with vinegar. The student uses two systems: an open cup and a sealed Ziploc bag. For both, the student adds a carefully measured 5 grams of baking soda to the cup or the bag. The student measures 15 grams of vinegar and adds it to the cup. Then, the student adds 15 grams of vinegar to the Ziploc bag and zips it shut. The resulting reaction in both systems forms bubbles. The student waits until the bubbles stop forming, then measures the resulting products. Here is the student's data:
Open Cup
20 g
Zipped plastic bag
20 g
Reactants
Baking soda 5g
Baking soda 5 g
Vinegar 15g
Vinegar 15 g
Products
18 g
Reactants
Products
20 g
Make a claim: do the results of these two reactions show conservation of mass? Your answer may be different for each reaction.
Support your claim: what explanation can you provide about why mass was or was not conserved?
1 answer
1 answer