Question

match each substance with its correct classification: element, compound, homogeneous mixture, or heterogeneous mixture.
vegetable soup
saltwater
carbon dioxide (co₂)
hydrogen
iron
concrete
bronze (alloy)
water (h₂o)

1. element
2. compound
3. homogenous mixture
4. heterogenous mixture

Explanation:

• Vegetable soup has visible different parts, so it's a heterogeneous mixture.
• Saltwater has uniform composition, so it's a homogeneous mixture.
• Carbon dioxide is made of carbon and oxygen atoms chemically bonded, so it's a compound.
• Hydrogen is a pure substance made of only hydrogen atoms, so it's an element.
• Iron is a pure substance made of only iron atoms, so it's an element.
• Concrete has visible different components, so it's a heterogeneous mixture.
• Bronze (alloy) has a uniform composition of different metals, so it's a homogeneous mixture.
• Water is made of hydrogen and oxygen atoms chemically bonded, so it's a compound.

Answer:

• Vegetable soup: 4. Heterogenous Mixture
• Saltwater: 3. Homogenous Mixture
• Carbon dioxide ($CO_2$): 2. Compound
• Hydrogen: 1. Element
• Iron: 1. Element
• Concrete: 4. Heterogenous Mixture
• Bronze (alloy): 3. Homogenous Mixture
• Water ($H_2O$): 2. Compound