Which balanced equation represents a chemical change?

(1) H2O (l) + energy → H2O (g)

(2) 2H2O (l) + energy → 2H2 (g) + O2 (g)

(3) H2O (l) → H2O (s) + energy

(4) H2O (g) → H2O (l) + energy

The nucleus holds what?

Is the speed of radio wave radiation higher or lower than infrared radiation

What is the salt that is produced when ammonia (NH3) and hydrochloric acid (HCl) react together? NCl NH4 + NH4Cl NH2Cl

Which element in the second column of the periodic table is likely to be the most reactive?

Two beakers contain clear. colorless liquids. When the contents of the beakers are mixed a white solid is formed, (a) Is this an example of a chemical or a physical change?

Nonmetal oxides can react with water to form acids. For example, carbon dioxide reacts with water to form carbonic acid: CO2 H2O H2CO3. (1) Write an equation to show how diiodine pentaoxide reacts with water to form an acid. Do not include states.

If atmospheric pressure suddenly changes from 1.00 atm to 0.892 atm at 298 k, how much oxygen will be released from 4.40 l of water in an unsealed container?

Determine the molecular formula for the unknown if the molecular mass is 60.0 amu and the empirical formula is ch2o.

Draw the organic product of the following nucleophilic reaction

How does the energy of the activated complex compare with the energies of reactants and products? select one: a. it is lower than the energy of both reactants and products. b.