Which is an example of a physical property? a)Reactivity with water b) Bolling point c) d) Tomishing=chorgngor (olor What is a key characteristic of a chemical change? a) Formation of a new substance (b)Change in state of matter c) Separation of mixtures d) Dissolution in a solvent Which property is considered a chemical property of a substance? a) Mass b) Volume c) Reactivity with oxygen d) Shape Which of the following is an indicator of a chemical change? a) Phase change from solid to liquid b) Change in mass c) Formation of bubbles or gas d) Dissolving of salt in water Which of these describes a physical property? a) Reaction with acid b) Flammability C)Hardness d) Corrosion Which of the following is not a chemical property? a) Reactivity with water b) Density c) Flammability d) Ability to corrode Which of these is an example of a chemical property? a) Color b) Melting point C)Reactivity with acid d) Electrical conductivity

Here are the answers and explanations for each question:**1. Which is an example of a physical property?*** **(b) Boiling point** * **Explanation:** Physical properties are characteristics that can be observed or measured without changing the substance's chemical composition. Boiling point is the temperature at which a substance changes from a liquid to a gas. This change is physical, not chemical.**2. What is a key characteristic of a chemical change?*** **(a) Formation of a new substance** * **Explanation:** Chemical changes involve the formation of new substances with different chemical compositions. This is a key indicator of a chemical reaction.**3. Which property is considered a chemical property of a substance?*** **(c) Reactivity with oxygen** * **Explanation:** Chemical properties describe how a substance reacts with other substances. Reactivity with oxygen refers to how readily a substance will combine with oxygen, which is a chemical reaction.**4. Which of the following is an indicator of a chemical change?*** **(c) Formation of bubbles or gas** * **Explanation:** The formation of bubbles or gas often indicates the release of a gas during a chemical reaction, signifying a change in the substance's composition.**5. Which of these describes a physical property?*** **(c) Hardness** * **Explanation:** Hardness is a measure of a substance's resistance to scratching or indentation. This is a physical property because it doesn't involve changing the substance's chemical makeup.**6. Which of the following is not a chemical property?*** **(b) Density** * **Explanation:** Density is a physical property that describes the mass of a substance per unit volume. It doesn't involve chemical reactions or changes in composition.**7. Which of these is an example of a chemical property?*** **(c) Reactivity with acid** * **Explanation:** Reactivity with acid describes how a substance reacts with an acid, which is a chemical reaction. This is a chemical property because it involves a change in the substance's composition.