Which of the following statements is/are true of combustion of gasoline in O 2 ? 1. The combustion reaction is spontaneous, so the free-energy change is negative.

2. The combustion reaction is spontaneous, so the free-energy change is positive.

3. The free energy of the system increases as the reactants are converted to products.

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.  

the ratio of the conjugate base to the acid required to attain the desired ph.

water and alcohols have similar properties because water molecules contain hydroxyl groups that can form hydrogen bonds with other water molecules and with alcohol molecules, and likewise alcohol molecules can form hydrogen bonds with other alcohol molecules as well as with water.