How many atoms would be left after 12 days if you started with 6.0 x 10^6 atoms of fermium-253 (half-life is 3 days)?
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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

Matches the chemical name of each oxide of phosphorus to its chemical formula

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