Is a small whole number that appears in front of a formula in a chemical equation?

3.52 L of a gas is a STP. Researchers compress this gas to 1.24 L. What is the new pressure of the gas?

30.0 mL of 0.50 M NaOH to neutralize 15.0 mL of HNO3, what is the concentration (molarity) of the HNO3?

How do you think the flooding likely affected the ecosystem?

R-12 should be recycled instead of vented to the atmosphere because A. recycling companies offer large financial incentives. B. it has been proven to deplete the Earth's ozone layer. C. R-12 is expensive. D. R-12 is unstable.

Which of the following substances has a molar mass of 208g

According to Boyle's law, how would you reduce the volume of a gas? a. by decreasing its pressure b. by increasing its temperature c. by decreasing its temperature d. by increasing its pressure

To what chemical reaction class does this reaction belong? 2 mg (s) + o2 (g) 2 mgo (s)

Which best illustrates how particle arrangement changes when solids change into liquids

Express in scientific notation (6.0x10^4) (3.1x10^-1)

How do you measure the mass of a liquid?