Determine the number if ions in one formula unit of Ca3(PO4)2

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

Here’s one way to follow the scientific method. place the missing steps in the correct position in the process

Calculate the molar mass of aluminum oxide (al2o3). express your answer to four significant figures.