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Sagot :
To answer this question, it is essential to categorize each property into either physical properties or chemical properties.
Physical properties are characteristics of a substance that can be observed or measured without changing the substance's chemical identity. Chemical properties describe a substance's potential to undergo chemical change or reaction based on its composition.
Let's categorize the given properties:
1. Color - This is a physical property because it describes the appearance of the lead without altering its chemical structure.
2. Density - This is a physical property, as it describes how much mass is in a given volume and is measurable without changing the substance.
3. Volume of sample - This is a physical property because it can be measured directly and does not change the composition of the lead.
4. Melting point - This is a physical property since it involves changing physical states (solid to liquid) without changing the substance's chemical makeup.
5. Reaction with air - This is a chemical property because it describes a chemical reaction where lead forms lead oxide when reacting with air.
6. Electrical conductivity - This is a physical property as it describes the material's ability to conduct electricity without changing its fundamental chemical structure.
Based on this categorization, we have:
- Physical Properties: color, density, volume of sample, melting point, electrical conductivity (5 properties).
- Chemical Properties: reaction with air (1 property).
Count the number of physical and chemical properties:
- Physical properties: 5
- Chemical properties: 1
Now, let's determine the true statement:
1. The student investigated only the physical properties of lead. - This statement is false since there is also a chemical property investigated (`reaction with air`).
2. The student investigated only the chemical properties of lead. - This statement is false because physical properties were investigated (`color`, `density`, `volume of sample`, `melting point`, `electrical conductivity`).
3. The student investigated more physical properties than chemical properties of lead. - This statement is true because there are 5 physical properties and only 1 chemical property.
4. The student investigated more chemical properties than physical properties of lead. - This statement is false since the number of physical properties (5) is greater than the number of chemical properties (1).
Thus, the true statement is: The student investigated more physical properties than chemical properties of lead.
Physical properties are characteristics of a substance that can be observed or measured without changing the substance's chemical identity. Chemical properties describe a substance's potential to undergo chemical change or reaction based on its composition.
Let's categorize the given properties:
1. Color - This is a physical property because it describes the appearance of the lead without altering its chemical structure.
2. Density - This is a physical property, as it describes how much mass is in a given volume and is measurable without changing the substance.
3. Volume of sample - This is a physical property because it can be measured directly and does not change the composition of the lead.
4. Melting point - This is a physical property since it involves changing physical states (solid to liquid) without changing the substance's chemical makeup.
5. Reaction with air - This is a chemical property because it describes a chemical reaction where lead forms lead oxide when reacting with air.
6. Electrical conductivity - This is a physical property as it describes the material's ability to conduct electricity without changing its fundamental chemical structure.
Based on this categorization, we have:
- Physical Properties: color, density, volume of sample, melting point, electrical conductivity (5 properties).
- Chemical Properties: reaction with air (1 property).
Count the number of physical and chemical properties:
- Physical properties: 5
- Chemical properties: 1
Now, let's determine the true statement:
1. The student investigated only the physical properties of lead. - This statement is false since there is also a chemical property investigated (`reaction with air`).
2. The student investigated only the chemical properties of lead. - This statement is false because physical properties were investigated (`color`, `density`, `volume of sample`, `melting point`, `electrical conductivity`).
3. The student investigated more physical properties than chemical properties of lead. - This statement is true because there are 5 physical properties and only 1 chemical property.
4. The student investigated more chemical properties than physical properties of lead. - This statement is false since the number of physical properties (5) is greater than the number of chemical properties (1).
Thus, the true statement is: The student investigated more physical properties than chemical properties of lead.
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