Problem page a chemistry student must write down in her lab notebook the concentration of a solution of sodium hydroxide. the concentration of a solution equals the mass of what's dissolved divided by the total volume of the solution. here's how the student prepared the solution: the label on the graduated cylinder says: empty weight: she put some solid sodium hydroxide into the graduated cylinder and weighed it. with the sodium hydroxide added, the cylinder weighed . she added water to the graduated cylinder and dissolved the sodium hydroxide completely. then she read the total volume of the solution from the markings on the graduated cylinder. the total volume of the solution was . what concentration should the student write down in her lab notebook? be sure your answer has the correct number of significant digits.

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.  

chemical digestion occurs in the stomach were hcl and pepsin forms chyme, the mouth in which salivary amylase breaks down starch to form bolus, and the small intestine specifically the duodenum.

the correct answer is:

a. formation of precipitation

> b takes place in the gas phase in an isothermal tubular reactor. the feed is one mole of a per one mole of c, an inert. the entering temperature and pressure are 427°c and 10 atm, respectively. the gas constant r = 0.08206 atm · l/mol · k.