Question

which real - world scenarios below represent physical changes? check all that apply. running a car engine, exploding fireworks, mixing water and powdered drink mix, combining oil and vinegar to make salad dressing, taking aspirin for a headache, diluting bleach with water, digesting thanksgiving dinner, spreading peanut butter on bread

Explanation:

A physical change is a change in the form or physical properties of a substance without a change in its chemical composition. Spreading peanut - butter on bread is just a change in the spatial arrangement of the peanut - butter and bread, no new substances are formed. Diluting bleach with water only changes the concentration of the bleach solution, not its chemical nature. Mixing water and a powdered drink mix is a physical process of dissolving the powder in water, no chemical reaction occurs. In digestion, chemical reactions break down food into smaller molecules. Taking aspirin involves chemical reactions in the body. Combining oil and vinegar to make salad dressing is a physical mixing, but they don't chemically react. Exploding fireworks is a chemical reaction due to the combustion of explosive compounds. Running a car engine involves chemical reactions in the combustion of fuel.

Answer:

Spreading peanut butter on bread, Diluting bleach with water, Mixing water and powdered drink mix