A. Explain the difference between an exothermic chemical reaction and an endothermic chemical reaction.

B. How is the enthalpy of reaction related to the enthalpies of formation for the products and reactants?

Consider the densities of copper (8.96) and sulfur (2.07), explain why 2 grams of copper takes up much less space than only 1 gram of sulfur.

What is the mass of a 1.00 l sample of a liquid that has a density of 0.967 g/ml? express your answer using three significant figures?

What do organisms need in the space where they live

If 100. mL of 0.400 M Na2SO4 is added to 200. mL of 0.600 M NaCl, what is the concentration of Na + ions in the final solution? Assume that the volumes are additive.

What is the E°cell for the cell represented by the combination of the following half-reactions? ClO4 - (aq) + 8H + (aq) + 8e - Cl - (aq) + 4H2O (l) E° = 1.389 V, VO2 + (aq) + 2H + (aq) + e - VO + (aq) + H2O (l) E° = 0.991 V

Calculate the heat evolved from a mixture of 14.1 l of sulfure dioxide

Which stament best describes a solution

Which answer accurately describes the difference between speed and velocity? Read each answer choice carefully. Question 4 options: A. If speed is constant, then velocity is also constant. B. Speed requires direction.

Least reactive element of period 3

A chemical formula shows the kind and number of Atoms that form a what? compound, mixture, solution, or suspension