What would you need to find an objects mass and velocity? what tools would you ude?

How many molecules are found in 1.32 mol of nacl?

When would a bouncy ball have the most potential energy

Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.