Answer:Résultat de recherche d'images pour "The mass number includes which subatomic particles ?"
The Bohr model shows the three basic subatomic particles in a simple manner. Most of an atom's mass is in the nucleus—a small, dense area at the center of every atom, composed of nucleons. Nucleons include protons and neutrons.
Explanation:
A. Mixture and D. Compound
Answer:
50 mL of HCl is required to react completely with 2.50g of sodium hydrogen carbonate.
Explanation:
The balanced equation shows that 1 mol of NaHCO₃ reacts with 1 mol of HCl. Therefore, we need to calculate the amount of moles present in 2.50g of NaHCO₃ to know how much in moles we will need of HCl. Then, we need to use the concentration to calculate the volume of the HCl solution that will be required.
First step: Calculating the number of moles of NaHCO₃
MM NaHCO₃ = 84.0 g/mol, m = 2.50 g
Second step: Calculating the volume of HCl
Answer:
Mass cannot be created or destroyed
Explanation:
The law of conservation of mass states that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations. According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants.
A la clase d no me voy al trabajo y me voy al colegio a las