The answer is b
the electrons are held within the atom by their attraction to the positively charged nucleus.
Answer:
the number of atoms in the reactants.
Buffer is composed of weak acid and its conjugate base or weak base and it is conjugate acid. so The correct answer is:
0.21 M hydrofluoric acid + 0.20 M potassium Fluoride
due to the first choice contain NaOH which is strong base not weak
second choice both salts no acid or base
Third choice contain HNO₃ which is considered as strong acid
Fourth choice contain ammonia but without its conjugate acid like (NH₄Cl for example) instead it has different salt
Fifth Choice contain HF which is weak acid and KF which is its conjugate base so this is the correct one
<span>The attraction between the shared electrons
and the nuclei that holds the molecules together in the second energy level of
phosphorus atom is a covalent bond. Electrons are kept in the orbit around the
nucleus by the electromagnetic force and the protons in the nucleus are held in
place by the strong nuclear force, which overcomes the electromagnetic
repulsion.</span>
Answer:
B has water as solvent
Explanation:
An aqueous solution is a solution in which the solvent is water.