What parts of the atom are exchanged in chemical reactions

Elena makes the table below to determine the number of atoms of each element in the chemical formula 3 (NH4) 2SO4 Total atoms Element Nitrogen Hydrogen Sulfur | Oxygen What mistake did Elena make?

23.10 grams of aluminum metal are dissolved in a solution that contains 1.89 mol of hydrochloric acid to yield aluminum chloride (AlCl3) and hydrogen gas according to the following balanced chemical equation.

A mixture of solute and solvent is called?

What are the main indications that a chemical reaction has occurred

a certain compound has a molecular mass of 60g and has the following percentage by composition carbon 40 %, hydrogen 6.67% and oxygen 53.3%. Determine it's molecular formula

1000ml of a gas is cooled from 500 K to 250 K, what is it's final volume? A. 250 ml B. 1000 ml C. 500 ml D. 750 ml E. 2000 ml

A reacton has a theoretical yield of 22.8g. When the reaction was carried out, 15.1g of the product was obtained. What is the percent yield?

Which of Newtons law's is sometimes expressed as "for every action there is equal and opposite reaction"

Provide a general comparison of the empty space in a solid with that in a liquid as well as

Which of the following are chemicals? A. clothing B. food C. fuels D. all of the above