Question

question 1 (5 points) which of the following is an example of a physical change? grinding coffee beans, digesting a cheeseburger, converting water to hydrogen and oxygen, baking a cake, burning coal. question 2 (5 points) in which of the following would the particles move most rapidly? steam at 110 °c, water at 20 °c, boiling water, ice at 0 °c, ice at -20 °c. question 3 (5 points) property of a solid?

Explanation:

1. A physical change is one where the substance's chemical composition remains the same. Grinding coffee beans only changes their physical form, not their chemical makeup. Burning coal, baking a cake, converting water to hydrogen and oxygen, and digesting a cheeseburger involve chemical reactions that change the substances' chemical identities.
2. The kinetic - theory of matter states that the particles of a gas move more rapidly than those of a liquid or a solid. Steam is in the gaseous state among the given options for water, so its particles move most rapidly.

Answer:

Question 1: Grinding coffee beans
Question 2: Steam at 110 °C