Why does the flask have to be closed during the water and alka seltzer reaction?

Suppose an nitrogen atom gains two electrons to become an nitrogen ion. what is its electrical charge?

What type of reaction is Mg + H2Cl2 - MgCl2 + H2? (Choose from: synthesis, decomposition, single replacement, or double replacement.)

Which measurement is a object mass

A burning match is an example of a chemical change phase change nuclear change physical change

2. A balloon is dunked into a tank of cold water. How will this affect the size of the balloon?

The Calvin cycle is another name for the

When a solution is considered to have a high concentration of hydrogen ions (H+) is also considered to be? a) acidic b) basic c) neutral d) hot

Why does the sky change colors at sunset? 1 because the sun changes colors 2 because the atmosphere reflects colors 3 because long wavelengths are scattered the least 4 because short wavelengths are scattered the least

Consider the reaction N2 (g) + 3 H2 (g) 2 NH3 (g), which is exothermic as written. What would be the effect on the equilibrium position of adding N2 (g) ?

According to Table I, which equation represents a change resulting in the greatest quantity of energy released? 1. 2C (s) + 2H2 (g) - > C2H4 (g) 2. 2C (s) + 3H2 (g) - > C2H6 (g) 3. N2 (g) + 3H2 (g) - >2NH3 (g) 4. N2 (g) + O2 (g) - > 2NO (g)