It has been estimated that 8.0 tons of gold have been mined. assume that gold costs $1700 per ounce. what is the total worth of this quantity of gold?

Why were metals such as copper and gold discovered long before gases such as oxygen and nitrogen?

What is the formula for the compound formed by calcium ions and chloride ions? (1) CaCl (2) CaCl2 (3) CaCl3 (4) Ca2Cl

Which statement best describes the trend in atomic radii observed in the periodic table? 1. The atomic radii increase, moving across a period to the right and up in a group. 2.

Is a small whole number that appears in front of a formula in a chemical equation?

Which of the following statements is false? The mean free path of a molecule depends on the size of the molecule.

Water is a great solvent. For example, it causes ionic compounds like sodium chloride (table salt) to dissociate. One of these reasons that water does is because it is polar molecule.

For most compounds with a single keto group in the molecule, equilibrium favors the keto form over the enol form of the compound. this is due largely to what?

The partial negative charge in a molecule of water occurs because the electrons shared between the oxygen and hydrogen stoms spend more time around the oxygen atom nucleus than around the hydrogen atom nucleus?

An electron moved from a higher energy level to a lower energy level. What most likely happened during the transition?

As the average kinetic energy of the particles in a gas increases, which of the following occurs? The temperature of the gas increases. The temperature of the gas decreases. The number of particles increases. The number of particles decreases.