What is the difference between crystalline and amorphous solid..???​

Which of the following is a testable hypothesis? a. if i brush my teeth, i will get fewer cavities than if i don't brush my teeth. b. green toothpaste tastes better than blue toothpaste or red toothpaste. c. smart, careful, healthy people always brush their teeth. d. it's wrong to not brush your teeth before you have an important conversation with someone.

In the reaction between a crushed antacid tablet and vinegar what gas is emitted

Which statement describes the phase change that occurs when dry ice is placed in an open container at room temperature?