Question

unit 3: chemical reactions & matter
where did the gas come from
summative quiz
part i
directions: using your resources, fill in the blank for each sentence.

1. when we combined bath bombs and water, the mass of the ______ stayed the same.
2. when we combined bath bombs and water, the mass of the open system ______.
3. when we crushed the bath bombs, the mass of the ____ and ____ systems stayed the same.
4. when we crushed the bath bombs, the ziplock bag did ____ fill up with ____.

part ii
directions: using your resources, place a check mark ✓ if the observations help prove × if the observations

Explanation:

To solve these fill - in - the - blank questions related to chemical reactions and matter (specifically about the law of conservation of mass and different systems), we analyze each question:

Question 1

In a closed system (when we combine bath bombs and water without any matter escaping), the mass of the closed system stays the same. This is based on the law of conservation of mass, which states that in a closed system, the total mass of reactants is equal to the total mass of products.

Question 2

When we combine bath bombs and water in an open system (where matter can enter or leave), the mass of the open system does not stay the same. Because in an open system, gases or other substances can escape or be added, so the total mass can change.

Question 3

When we crushed the bath bombs, the mass of the reactants (bath bombs) and products (substances after crushing) systems stayed the same. Crushing is a physical change, and in a closed system (if we consider the crushed bath bombs and their surroundings without matter exchange), the mass remains conserved.

Question 4

When we crushed the bath bombs, the Ziplock bag (which is a closed system if it's sealed properly) did not fill up with gas (assuming no chemical reaction that produces gas upon crushing; if there was a chemical reaction, but in the context of just crushing, the main idea is about mass conservation. If we consider a situation where gas is produced, but in the case of a Ziplock bag as a closed system, the mass inside stays the same, and if there was a reaction producing gas, the bag might inflate, but the mass of the system (bag + contents) remains the same. However, if we are talking about the bag's appearance, if there is no gas production, it won't fill up with gas. )

Answer:

s:

1. closed system
2. open system
3. reactants and products
4. not (or "not fill up with gas" depending on the context, but the key is related to mass conservation in the system)