Lanthanum-138 has a half-life of 105 billion years. After 525 billion years, how much of a 240 g sample of this radioisotope will remain?

nevermind, I got 7.5g and was right

How many milliliters of water at 23 °C with a density of 1.00 g/mL must be mixed with 180 mL (about 6 oz) of coffee at 95 °C so that the resulting combination will have a temperature of 60 °C?

Does gravity affect the orbit of the international space

The element in Group 14, Period 3 on the Periodic Table is classified as a (1) metal (3) metalloid (2) noble gas (4) nonmetal

Why should the pka of a leaving groups conjugate acid be considered when performing a substitution reaction

One in which the reactants are in different phases is called

The density of water is 1.0 g/cm3 will rubbing alcohol float with a density of 0.81 g/cm3

Write an equation that shows the formation of the phosphide ion from a neutral phosphorus atom.

Which of the following terms is defined by the measure of mass per unit of volume? gravity density weight acceleration

Select the lon. O NO₂ H2SO4 O A3

True or False: A Solar eclipse occurs when Earth casts a shadow on the Moon.