A sample is composed completely of gold and is absolutely free of impurities. Which term or terms could be used to describe this sample of gold?

Write the mole ratios for reactants in terms of products for the following equation: 2 Mg + O2 → 2 MgO

What is the difference between a molecule and a compound?

If a sample of oxygen occupies a volume of 85.0 L at a pressure of 67.4 kPa and a temperature of 245K, what volume would the gas occupy at 179.6 kPa and 273K?

2. Vanadium (V) Oxide equation

The chemical symbol for the element calcium is Ca what would be the symbol representing calcium atoms that have lost two electrons? is it Ca^+2

Find the number of moles of water that can be formed if you have 134 mol of hydrogen gas and 62 mol of oxygen gas

The amount of kinetic energy an object has depends on its. motion position gravity height

What is the empirical formula of Fe?

Small beads of iridium-192 are sealed in a plastic tube and inserted through a needle into breast tumors. If an Ir-192 sample has an initial activity of 560 dpm, how much time is required for the activity to drop to 35 dpm (t1/2 = 74 days) ?

Consider the following equation. 2H2 (g) + O2 (g) 2H2O (g); ΔH is negative. Which statement is true? The reaction is endothermic from left to right. Increased pressure would increase the rate of forming water vapor.