Answer:
D
Explanation:
heterogeneous mixture you can see the different substances that go into it.
homogeneous mixture you can't see the difference, the mixture looks like one substance.
If anything you would use a protractor but that’s not a answer.... so I would pick whatever relates to a protractor
Answer:

Explanation:
Hello there!
In this case, according to the given chemical reaction for this problem about stoichiometry:

Whereas there is a 3:2 mole ratio of oxygen (molar mass = 32.0 g/mol) to iron (III) oxide (molar mass = 159.69 g/mol) and therefore, the correct stoichiometric setup is:

Regards!
After a radioactive atom decays, it is the same element that it
was before with no measurable change in mass. the decay that is present is
gamma decay because gamma decay has photons which has no mass unlike alpha and
beta decay.