A student investigated some properties of lead and recorded the findings in the table below.

\begin{tabular}{|l|l|}
\hline
\multicolumn{1}{|c|}{Property} & \multicolumn{1}{c|}{Observation} \\
\hline
color & dull gray \\
\hline
density & [tex]$11.3 \, g/cm^3$[/tex] \\
\hline
volume of sample & [tex]$3.00 \, cm^3$[/tex] \\
\hline
melting point & [tex]$327^{\circ} C$[/tex] \\
\hline
reaction with air & lead oxide forms on the surface \\
\hline
electrical conductivity & conducts some electricity \\
\hline
\end{tabular}

Which statement is true with respect to the investigation?

A. The student investigated only the physical properties of lead.

B. The student investigated only the chemical properties of lead.

C. The student investigated more physical properties than chemical properties of lead.

D. The student investigated more chemical properties than physical properties of lead.



Answer :

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.