You place a beaker of water on a hot plate and heat it up eventually it starts to boil and you see bubbles for me you also seemed steam rising from the water surface is it physical or chemical change

A248-g piece of copper is dropped into 390 ml of water at 22.6 °c. the final temperature of the water was measured as 39.9 °c. calculate the initial temperature of the piece of copper. assume that all heat transfer occurs between the copper and the water. remember, the density of water is 1.0 g/m

Which of the following harmful chemicals are found in tobacco smoke? a. carbon monoxide b. carbon dioxide c. nicotine b. carbon dioxide d. both a and c

Determine the maximum r-value of the polar equation r =3+3 cos 0