if crystal growth does not start on its own after the solution in the flask returns to room temperature, identify the best ways to promote this process.

Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?

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

This classification of drug typically changes the brain's chemistry and reduces its ability to create its own endorphins.