The only way to know a chemical reaction has take place is to
•Check to see if a new substance(s) are formed
•Check to see if there was a color change
• Check to see if there was a gas released
•Check to see if the temperature changes.

Which statement describes how phase changes can be diagrammed as a substance is heated? the phase is on the y-axis and the temperature is on the x-axis. the temperature is on the y-axis and the phase is on the x-axis. the time is on the y-axis and the temperature is on the x-axis. the temperature is on the y-axis and the time is on the x-axis.

Asample of aluminum foil contains 8.60 × 1023 atoms. what is the mass of the foil?

Compare and contrast physical changes with chemical changes.