Predict the bond present between carbon and hydrogen in polyethylene

True or false, the three major scales used to measure earthquakes are mercalli scale, richter scale and magnitude scale

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

Compare and contrast the bohr model and the electron cloud models of the atom.