A fossilized animal that was killed by a volcanic eruption has 6.25 percent of its original amount of carbon-14 remaining; this radioisotope has a half-life of 5730 years. How long ago did the volcano erupt?

Which one of the following statements is correct? A. An electron has a negative electrical charge. B. An electron has a neutral electrical charge. C. An electron is much larger than an atom. D. An electron is located inside the nucleus of an atom.

Identify which property changes as temperature increases to increase the reaction rate. A) Increasing the temperature decreases the molecular motion. B) Increasing the temperature reduces the collision frequency.

Which action will slow down the rate of a reaction A. Increasing the concentration of the reactants B. Adding a catalyst to the reaction C. Raising the temperature of the reactants D. Decreasing surface area of a solid reactant

What is the relationship between the volume of water and the dripping time?

Which Of The Following Would Represent An Increase In Entropy A. Precipitating B. Condensing C. Thawing D. Freezing

In most Acid-base reactions, what type of bond (ionic or covalent) is formed between the ions of the "salt"? What happens to the electrons in this sort of bond? Are they transferred, or shared?

Many trials are not needed before a hypothesis can be accepted

Consider the following reaction where Kp = 4.55*10-5 at 723 K: N2 (g) + 3H2 (g) ⇋ 2NH3 (g) a) If the three gases are mixed in a rigid container at 723 K so that the partial pressure of each gas is initially one atm, what will happen?

Rob measures the solubility of three different salts in water at 22°C. Which type of graph should he use to display his data? bar graph line graph histogram scatterplot

Consider the reaction below. The initial concentrations of PCl3 and Cl2 are each 0.0571 M, and the initial concentration of PCl5 is 0 M. If the equilibrium constant is Kc=0.