Worksheet identifying chemical and physical properties of various substances.

To solve this problem, we need to understand the difference between chemical and physical properties.

Step-by-Step Reasoning:

1. Physical Properties:
- These are characteristics of a substance that can be observed or measured without changing the substance's chemical identity.
- Examples include density, melting point, boiling point, color, and state of matter.

2. Chemical Properties:
- These describe how a substance behaves during a chemical reaction or change, where its chemical identity is altered.
- Examples include flammability, reactivity with acids, and the ability to rust.

Now, let's analyze each statement from the image:

1. The density of Uranium (U) is 19.1 grams/cm³.
- Density is a physical property because it can be measured without changing the substance's chemical identity.

2. The melting point of Zinc (Zn) is 420°C.
- Melting point is a physical property because it describes a change in state without altering the chemical identity.

3. The boiling point of Chlorine (Cl) is 8.87°C.
- Boiling point is a physical property for the same reason as melting point.

4. The density of Gallium (Ga) is 1.86 grams/cm³.
- Again, density is a physical property.

5. Silicon (Si) is gray.
- Color is a physical property.

6. The melting point of Helium (He) is -272°C.
- Melting point is a physical property.

7. The half-life of Radium (Ra) is 3.8 days.
- Half-life is a chemical property because it involves radioactive decay, which changes the chemical identity.

8. Glucose (C₆H₁₂O₆) is soluble in water.
- Solubility is a physical property because it describes how well a substance dissolves without changing its chemical identity.

9. The pH of concentrated hydrochloric acid (HCl) is close to 0.
- pH is a chemical property because it relates to the concentration of hydrogen ions, which is a chemical characteristic.

10. Lithium (Li) reacts violently with water.
- Reactivity with water is a chemical property because it involves a chemical reaction.

11. Sulfur (S) is yellow.
- Color is a physical property.

12. When sodium (Na) reacts with water (H₂O), it releases hydrogen gas.
- This is a chemical property because it describes a chemical reaction.

13. When burned, kerosene releases 46.2 J/g of energy.
- Combustion is a chemical property because it involves a chemical reaction.

14. Barium (Ba) is a block.
- State of matter is a physical property.

15. Lead (Pb) is a malleable metal.
- Malleability is a physical property.

16. The density of gold (Au) is 19.32 grams/cm³.
- Density is a physical property.

Final Answer:

The properties are classified as follows:
- Physical: 1, 2, 3, 4, 5, 6, 8, 11, 14, 15, 16
- Chemical: 7, 9, 10, 12, 13

Final Answer: \boxed{Physical: 1, 2, 3, 4, 5, 6, 8, 11, 14, 15, 16; Chemical: 7, 9, 10, 12, 13}