During science lab, jacob mixes together sodium hydroxide (naoh) and hydrochloric acid (hcl). the two chemicals react to form sodium chloride (nacl) and water (h2o).

which of the following are reactants in the chemical reaction described above?
a.
sodium hydroxide and sodium chloride
b.
sodium hydroxide and hydrochloric acid
c.
sodium chloride and water
d.
hydrochloric acid and water

the answer is B sodium hydroxide and hydrochloric acid

Explanation:

The reactants in a solution are always the substances that are involve at the beginning of the chemical equation. with this paragraph about what Jacob did  in the lab we can write a chemical equation

NaOH + HCl ⇒NaCl + H2O

the two first mixed substances were sodium hydroxide and hydrochloric acid hence they are the reactants, the substances that reacts to form a product that in this case the product is the two substance on the right of the arrow NaCl and H2O

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.