It is an alloy: a homogenous mixture of two (or more) metals. An 'single-phase solid-in-solid'-mixture.
No... its a mixture
No.
It is a mixture.
Containing dust air is a heterogeneous mixture.
A cake is a heterogeneous mixture.
Gatorade is a homogeneous mixture.
Smoke is a heterogeneous mixture.
Blood is a heterogeneous mixture.
No.
Muddy water is a heterogeneous mixture.
This is not a homogeneous mixture.