use cause and effect relationship to explain why a convection current forms when hot rocks and cold rocks are placed in a tank of water.

Different isotopes indicate that an element will have different numbers of

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

An atom of which element reacts with an atom of hydrogen to form a bond with the greatest degree of polarity ?