a radioactive substance has a half-life of 10 years. if you start with 30 grams of the substance, how much will remain after 30 years.

If he (g) has an average kinetic energy of 5610 j/mol under certain conditions, what is the root mean square speed of o2 (g) molecules under the same conditions?

In an experiment, a student estimates the acceleration due to gravity is 9.31 m/s2. The actual value is 9.8 m/s2. What is the student's percent error

Calculate the mass for 3 moles of ammonia.

Butane (c4h10) is the liquid fuel in lighters. how many grams of carbon are present within a lighter containing 7.25 ml of butane? (the density of liquid butane is 0.601 g/ml.) express the mass in grams to three significant figures.

At elevated temperatures, solid silicon reacts with chlorine gas to form gaseous SiCl4. At some temperature, the equilibrium constant for this reaction is 0.30. If the reaction is started with 0.

How are microwaves produced?

Non metals are acidic in nature explain with an equation

How is law of conversation energy and mass similar

Which expression represents the percent by mass of nitrogen in NH4NO3?

What is the molarity of 500 ml of a solution containing 85.0g AgNO3? A) 0.5 M B) 1.0 M C) 2.0 M D) 5.0 M