Radium-226 is a common isotope on earth, but it has a half-life of about 1620 years. given that earth is some 5 billion years old, why is there any radium at all?

List 2 units of mass

Regarding water's ability to move up a glass tube, which of the following is true?

Are all single replacement reactions considered redox reactions?

Which type of energy transformation is taking place when natural gas is used to heat water? A. chemical energy into thermal energy B. thermal energy into mechanical energy C. mechanical energy into electromagnetic energy D.

Which statement is true if the hrxn of a reaction is positive

Which of the following polymers is used in plastic bottles and plastic containers? Select one: a. LDPE b. PVC c. Polystyrene d. HDPE e. Polypropylene

Which of the following statement is not true? A) The sun is involved in producing tides B) There can be two high tides in one location during a single day C) Only the oceans have tides D) If there is a high tide, there will be a low tide

A solution which has a concentration that exceeds its predicted solubility at a certain temperature and pressure would be -

Convert 4.992*1010 g to each of the following units. B. Mg c. mg D. metric tons

The ideal gas law shows us how a gas will behave under many conditions. The formula is: P V = n R T Where P = pressure, V = volume, n = amount of the substance, R = ideal gas constant, and T = temperature.