What is the molar ratio between oxygen and carbon dioxide, given the following equation? 2c4h10 + 13o2 right arrow 8co2 + 10h2o

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

Can someone me with 1 to 4 plz. fast

Which of these is not an example of chemical weathering? a. iron-rich mineral rusting b. feldspar turning into clay c. limestone reacting with acid d. granite breaking up into sand