Question

question 16 not yet answered marked out of 1.00 flag question is mixing sand and water a physical or chemical change? select one: a. physical b. chemical clear my choice question 17 not yet answered marked out of 1.00 flag question is rusting iron a physical or chemical change? select one: a. physical b. chemical question 18 not yet answered marked out of 1.00 flag question is boiling water a physical or chemical change? select one: a. physical b. chemical question 19 not yet answered marked out of 100 is digesting taco bell a physical or chemical change? select one: a. physical

Explanation:

• Question 16: Mixing sand and water only combines the two substances without forming new chemical compounds; the sand and water retain their original properties, so it is a physical change.
• Question 17: Rusting iron involves a chemical reaction where iron reacts with oxygen and water to form iron oxide (rust), a new substance with different properties, so it is a chemical change.
• Question 18: Boiling water only changes its state from liquid to gas (water vapor); no new substance is formed, so it is a physical change.
• Question 19: Digesting food involves breaking down complex molecules (like in Taco Bell food) into new simpler molecules via chemical reactions in the body, so it is a chemical change.

Answer:

1. Question 16: a. Physical
2. Question 17: b. Chemical
3. Question 18: a. Physical
4. Question 19: b. Chemical