What pressure (in atmospheres) is requires to compress 1.00 L of gas at 760. Mm Hg pressure to a volume of 50.0 mL?

How does litmus paper indicate an acid?

Select the atomic models that belong to the same element

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.