The correct answer is (C. zirconium - 93.
Answer:
Density is the total number of particles in a given volume
Explanation:
As per the particle theory, density is defined as total space occupied by certain number of particles of any given element with in a defined volume is termed as density.
Density is not the denseness of a single unit but the space occupied by many single units with in a given volume V
Hence, density is the total number of particles in a given volume.
Answer:
Barium chloride + Sodium phosphate → barium phosphate + sodium chloride
Explanation:
Double replacement:
It is the reaction in which two compound exchange their ions and form new compounds.
AB + CD → AC +BD
Chemical equation:
BaCl₂ + Na₃PO₄ → Ba₃(PO₄)₂ + NaCl
Balanced chemical equation:
3BaCl₂ + 2Na₃PO₄ → Ba₃(PO₄)₂ + 6NaCl
The cation and anion of both reactants are exchanged with each other.
Ba²⁺ react with PO₄³⁻ and form Ba₃(PO₄)₂ while Cl⁻ react with Na⁺ and form sodium chloride.
Molecular equation:
Barium chloride + Sodium phosphate → barium phosphate + sodium chloride
<span>Characterized by necrosis of gingival tissues, periodontal ligament, and alveolar bone. Associated with HIV infections and immunosuppressive therapies. Severe and rapid periodontal destruction. Alveolar bone loss, resulting in lack of deep packet formation. </span>
Answer:
Al₄O₅
Explanation:
The key at the bottom tells us the blue spheres are oxygen atoms and the red spheres are aluminum atoms. By counting, there are 4 aluminum atoms and 5 oxygen atoms. Therefore, the formula is Al₄O₅.
