If the half life of a radioactive isotope is 4000 years, how much would be left in a fossil after 4000 years

Write an equation that shows the dehydration of manganese (ii) sulfate pentahydrate.

For a particular isomer of C8H18, The following reaction produces 5093.7 KJ of heat per mole of C8H18 (g) consumed under standered conditions. What is the standard enthalpy of formation of this isomer of C8H18 (g) ?

HNO3 increases the consentration of what when added to water

The net force acting on an object is 0 N. Which of the following best describes the motion of the object?

An element a combines with fluorine to form an ionic compound having the formula af3. what is the formula of the ionic compound formed between iodine and a?

Why is oil unable to dissolve well in water? Water is polar and oil is nonpolar, which means they have no attraction for each other. Oil molecules are too large to fit between the closely spaced water molecules in the liquid state.

The fertilizer ammonium sulfate is prepared by the reaction between ammonia and sulfuric acid. How many kg of ammonia are needed to produce 1x10^5 kg of (NH4) 2SO4?

The conversion of chemical energy to mechanical energy is best described by which example? A. sunlight warming the ground B. electricity boiling water C. fuel being combusted to power a rocket

he density of solid aluminum is 2.70. If a 1g peice of aluminum is dropped in a cup of water, it will sink to the bottomfloat to the tophover in the middle. (The density of water is 1.0

Match the action to the effect on the equilibrium position for the reaction N2 (g) + 3H2 (g) ⇌ 2NH3 (g). Match Term Definition Increasing the pressure A) Shift to the left Removing hydrogen gas B) No effect Adding a catalyst C) Shift to the right