If 5.4 g of NaNO3 is dissolved in 350 mL of water, what is the molarity of the solution?

Which of the following would be an accurate picture of the earth during the summer time of the northern hemisphere?

Iron (3) oxide will decompose in the presence of hydrogen gas and heater to produced iron and digydrogen monoxide white a balanced chemical equation

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.