Question

question 4
the ______________ states that matter is neither created nor destroyed. this means that however much mass we start with in a chemical reaction should equal how much mass we end with.

• law of conservation of energy
• law of conservation of mass
• law of conservation of chemicals
• law of entropy

question 5
what evidence of a chemical reaction did we see when the sodium bicarbonate reacted with the acetic acid? (choose 2)

• bubbles
• temperature change
• a solid is formed
• color change

question 6
what is the answer to the total mass of both fe atoms on #6?
112

Explanation:

Question 4:

The described law defines that mass is conserved in chemical reactions, matching the Law of Conservation of Mass.

Question 5:

When sodium bicarbonate reacts with acetic acid, carbon dioxide gas (bubbles) is produced, and the reaction is exothermic, causing a temperature change.

Question 6:

The molar mass of Fe is 56 g/mol. For 2 Fe atoms, total mass is $2 \times 56 = 112$.

Answer:

1. Question 4: Law of Conservation of Mass
2. Question 5: bubbles, temperature change
3. Question 6: 112