What happens to chemical bonds between atoms or ions during a chemical reaction?

Which phase has the lowest entropy? Why? How does a change in phase affect entropy changes in a reaction?

2. What effect does adding a neutron have on the atom's mass?

A sample of nitric acid contains both H3O ions and NO3 ions. This sample has a pH value of 1. What is the color of methyl orange after it is added to this sample?

Which statement is part of Bohr's atomic model? Electrons absorb or emit light when they change energy levels. Electrons with the highest energy are found with orbits of the smallest radius.

Physical properties can be used to describe matter. Some properties are dependent on the amount of matter present. All BUT ONE of these physical properties changes with the amount of matter. That is A) density. B) mass. C) volume. D) weight.

Catalysts are substances that increase the rate of reaction but can be recovered unchanged at the end of the reaction. Catalysts can be classified as either homogeneous (same state as reactants) or heterogeneous (different state than reactants).

How many molecules are there in 79g of Fe2O3?

Which of the following elements is an alkall metal?

A student mixes 0.50 L of 0.0020 M Ba (NO3) 2 solution with 0.50 L of 0.0080 M Na2SO4 solution. Which equation shows the proper set-up to calculate molar concentration of Ba2 + ions in the new solution? (0.0020 M) (1 L) = (? M) (0.0020 M) (0.

A silver block, initially at 58.5°C, is submerged into 100.0 of water at 24.8°C in an insulated container. The final temperature of the mixture upon reaching thermal equilibrium is 26.2 °C. What is the mass of the silver block?