⚠️Need Help⚠️The empirical formula for a sample of octane that contains 12 grams carbon and 4.5 grams hydrogen formula is...?

Which real-world scenarios below represent physical and chemical changes? -running a car -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 dinner-spreading peanut butter on bread

Which atom or ion is the largest? a. k b. k+ c. ca d. ca2+ e. li

What are four significant sources of ghgs that come from wostem washington?