You found a piece of sidewalk chalk with a mass of 15.8 grams and used it to draw on the sidewalk, so that the mass of the piece of chalk decreased to 2.1 grams. How many molecules of chalk did you leave outside on the sidewalk? (Chalk is CaCO3.)

Energy is released during which phase changes? check all that apply. boiling condensing depositing freezing melting subliming

Which of the following two events occur to create a sea breeze? select all that apply. warm air rises on the ocean and moves toward the land to cool warm air rises on land and moves toward the ocean to cool cool air moves from the ocean to be warmed by the land cool air moves from the land to be warmed by the ocean

Identify arrows pointing to bonding electrons. done h-0-0-h ) intro