Depending upon the tip of the of a dropper pipet, there are approximately 20 drops per milliliter of water. the experimental procedure, parts a and b indicates the addition of 5-10 drops of each solution to the test tube. calculate the volume range in milliliters for a solution.

Answer : Volume range in milliliters for a solution is 0.25 ml to 0.5 ml.

Solution : Given,   1 ml = 20 drops

There are 20 drops present in     =    1 ml of water

                 In 1 drop                       =    

        And in 5 drops                     =    

                                                      =     0.25 ml

For range calculation, 0.25 ml is multiplied by the 2, we get

    = 0.25 × 2

    = 0.5 ml

Hence, the volume range is 0.25 ml to 0.5 ml.

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.  

2b2t

explanation:

2b2t