how do you know that a chemical has happened? A: A substance is mixed with water and forms a solution. B: The substance increases in temperature. C: The substance changes its state. D:A new substance forms. *It didn't say science so I put it as chemistry but its science sorry​

Adrop of acetone (nail polish remover) has a mass of 35 mg and a density of 0.788 g/cm3. what is its volume in cubic centimeters?

After watching the video "zinc strip in copper nitrate solution", and reading the instructions, click on the link labeled "start" just below the drawing of the pencil tip. follow the direction to complete the 3x3 grid. answer the below questions for the portion of the activity in which sn(s) is placed in agno3(aq)

Can someone me with 6 to 10 plz this is for masteries test.