Achemisrty instructor provides each student with 8 test tubes at the beginning of the year if there are 28 students per class, how many test tubes are required for three chemistry classes

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

Asolution contains 225 g of sodium chloride, nacl, dissolved in enough water to make a 0.25 l of solution. what is the molarity of the solution? a. 3.88 m, b. 1.03 m, c. 1.5 m, d. 15.5 m

When electrolyzing copper (ll) chloride, what reaction takes place at the anode? what reaction takes place at the cathode?