Question

part c — the matter inside the bubble

1. what type of matter is the air inside your bubble?

circle one: pure substance / mixture
explain your answer using what you know about air:

part d — what makes the bubble work?

1. why can water alone not make strong bubbles?

(hint: think about soap and surface tension.)

was added to the bubble mixture, how would that change the

Explanation:

Question 7

Air is a mixture because it consists of multiple different gases (like nitrogen, oxygen, carbon dioxide, etc.) combined together, and these components can be separated by physical means. A pure substance has a fixed composition and distinct properties, while air has variable composition (though mostly nitrogen and oxygen) and is made of multiple substances. So we circle "Mixture".

Air is a mixture as it contains multiple gases (e.g., $\ce{N_2}$, $\ce{O_2}$, $\ce{CO_2}$) combined, with variable composition, and components can be separated physically.

Question 8

Water has high surface tension due to strong hydrogen bonding between its molecules. This high surface tension makes it hard for water to spread out and form thin, flexible films needed for bubbles. Soap reduces water's surface tension by interfering with hydrogen bonds, allowing the water to stretch into a bubble film. Without soap, water's high surface tension causes it to contract, preventing strong, stable bubbles from forming.

Answer:

Circle: Mixture