What is the only sure evidence for a chemical reaction?

Procedure for the experiment. 1. Crush 1 stick of classroom chalk (a mixture of limestone and gypsum) finely. 2. Mix chalk into 50 ml of water in a beaker. 3. Pour the mixture through filter paper into another beaker. The water appears to be "pure.

In ___, each of the bulbs would be Set up in paths independent and complete.

Which statement describes the strength of hydrogen bonding as an intermolecular force? A. Hydrogen bonding is the weakest intermolecular force. B. Hydrogen bonding is a medium-strength intermolecular force. C.

Which of the following is not a redox reaction? A. H2O (l) + NH3 (g) LaTeX: / longrightarrow NH4 + (aq) + OH - (aq) B. 2H2 (g) + O2 (g) LaTeX: / longrightarrow 2H2O (l) C. Zn (s) + H2SO4 (aq) LaTeX: / longrightarrow ZnSO4 (aq) + H2 (g) D.

The Aufbau principle states that:Select the correct answer below:1. You must place one electron in each orbital in a subshell before doubling up. 2.

Clouds that form at an elevation of 3 kilometers will most likely be composed of A) raindrops B) ozone C) ice crystals D) sleet

Describe how glacial erosion influenced the topography of Ohio.

Which of the answer choices lists a compound? h2, h2o, NaCl, or O2

What is earths water called

What volume of product is produced when 20.0 Mg of liquid hydrogen reacts with excess liquid oxygen in a rocket propellant reaction? Gas is formed 101.3 to 5 kPa and 40.0 °C