To determine which statement is true with respect to the investigation, we need to classify each property of lead as either a physical property or a chemical property.
1. Color: dull gray
- This is a physical property because color describes a feature of the matter itself without changing its chemical identity.
2. Density: 11.3 g/cm³
- This is a physical property because it describes the mass per unit volume of lead without any change in the chemical composition.
3. Volume of sample: 3.00 cm³
- This is a physical property, as volume is a measure of the amount of space an object occupies, again, without altering its chemical identity.
4. Melting point: 327°C
- This is a physical property because melting point is the temperature at which a substance changes from a solid to a liquid; the substance remains chemically the same.
5. Reaction with air: Lead oxide forms on the surface
- This is a chemical property because it describes lead's ability to react with air and form a new substance (lead oxide), indicating a change in the chemical composition of lead.
6. Electrical conductivity: Conducts some electricity
- This is a physical property as it describes how well lead can conduct electricity without altering its chemical composition.
Now, we count the number of physical and chemical properties:
- Physical properties: 5
(color, density, volume of sample, melting point, electrical conductivity)
- Chemical properties: 1
(reaction with air)
The statement that corresponds to the student's investigation is:
"The student investigated more physical properties than chemical properties of lead."
Hence, the correct statement is:
The student investigated more physical properties than chemical properties of lead.
