Question

question 5 (5 points)
gas bubbles forming after mixing 2 liquids shows that a chemical change has occured.
true
false

question 6 (5 points)
a student is designing a frying pan and must choose between plastic, copper, or wood. using what you know about physical an which material is best and why.
a copper, because it conducts heat well
b wood, because it absorbs heat
c plastic, because it doesnt rust
d plastic, because it melts easily

Explanation:

Question 5

When two liquids are mixed and gas bubbles form, it indicates a chemical reaction has taken place. Gas formation is a sign of a new substance being created, which is characteristic of a chemical change.

A frying pan needs to conduct heat well to cook food properly. Copper is a good conductor of heat. Wood is not a good conductor (it absorbs heat but not in a way suitable for a frying pan's main function of heat transfer for cooking). Plastic is a poor conductor and melting easily (option d) is a negative trait for a frying pan. Also, not rusting (option c) is not the main criterion for a frying pan's material selection compared to heat conduction.

Answer:

True

Question 6