Answer:
a). iron ore - is a heterogeneous substance.
b). quartz - is a homogeneous substance.
c). granite - is a heterogeneous substance.
d). energy drink - is a heterogeneous substance.
e). oil-and-vinegar salad dressing - is a heterogeneous substance.
f). salt - is a homogeneous substance.
g). rainwater - is a heterogeneous substance.
h). nitrogen - is a homogeneous substance.
Explanation:
a). iron ore - is a heterogeneous substance as iron core contains iron and other impurities
b). quartz - is a homogeneous substance as it is only made up of carbon
c). granite - is a heterogeneous substance as it is made up of multiple minerals.
d). energy drink - is a heterogeneous substance as it contains various substances mixed in it
e). oil-and-vinegar salad dressing - is a heterogeneous substance as oil and vinegar itself are different compounds
f). salt - is a homogeneous substance as it only contains one type of molecule
g). rainwater - is a heterogeneous substance as it contains water and other minerals
h). nitrogen - is a homogeneous substance as it is only made of one type of molecule.
