Question

1. why should wire gauze be used when heating glass containers with a gas flame?

the glass may break when exposed to high heat, but the wire gauze prevents the glass from coming into direct contact with the flame.
the glass may change colors when exposed to high heat, but the wire gauze prevents your eyes from being damaged
wire gauze should not be used
the glass may become hot when exposed to high heat, but the wire gauze protects your hands from being burned

Explanation:

When heating glass containers with a gas flame, glass can break due to thermal stress from direct high - heat contact. Wire gauze acts as a barrier. The second option about eye damage is incorrect as wire gauze isn't for eye protection in this context. The third option is wrong as wire gauze is useful. The fourth option is incorrect because wire gauze isn't for hand protection when it comes to the heat - glass interaction.

Answer:

The glass may break when exposed to high heat, but the wire gauze prevents the glass from coming into direct contact with the flame.