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|}{} \\
\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 \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 the correct statement with respect to the investigation, we need to classify each of the properties listed as either physical or chemical properties.

1. Color: This is a physical property. It describes the appearance of the lead without changing its chemical composition.
2. Density: This is a physical property. Density is a measurement that does not involve altering the substance itself.
3. Volume of sample: This is a physical property. It represents the space occupied by the lead, again without changing its chemical structure.
4. Melting point: This is a physical property. It is a characteristic that describes the temperature at which lead changes from solid to liquid, without changing its chemical composition.
5. Reaction with air: This is a chemical property. When lead reacts with air to form lead oxide, its chemical composition is altered.
6. Electrical conductivity: This is a physical property. It describes the ability of lead to conduct electricity, which does not change the chemical identity of the lead.

Let's count the physical properties:
- Color
- Density
- Volume of sample
- Melting point
- Electrical conductivity

There are 5 physical properties.

Now, let's count the chemical properties:
- Reaction with air

There is 1 chemical property.

Since the student has investigated more physical properties (5) than chemical properties (1), the correct statement is:

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