Question

1. compare and contrast elements and compounds. list at least three differences. (6 pts)

Explanation:

• Definition: Elements are pure substances with only one type of atom (e.g., oxygen - O). Compounds are substances formed by chemically combining two or more elements (e.g., water - H₂O).
• Separation: Elements cannot be broken down into simpler substances by chemical means. Compounds can be decomposed into their constituent elements through chemical reactions.
• Properties: Elements have their own unique physical and chemical properties (e.g., metallic luster for metals like iron). Compounds have properties different from the elements that make them up (e.g., water is liquid at room temperature while hydrogen and oxygen are gases).

Answer:

1. Elements are pure substances with one - type atoms; compounds are formed by combining elements.
2. Elements can't be chemically broken down; compounds can be decomposed.
3. Elements have their own properties; compounds have different properties from their elements.