The pH indicator bromothymol blue turns yellow when CO2 gas is added to a
solution and blue when CO2 is removed from a solution. In an experiment that
tests how the intensity of light affects the rate of photosynthesis by algae,
how would bromothymol blue be used?
O
A. To estimate the temperature at which a solution containing algae
and the indicator turns blue under different intensities of light
O
B. To count the number of air bubbles in a solution containing algae
and the indicator when it turns yellow under different intensities of
light
O
C. To measure the volume of a solution containing algae and the
indicator when it turns yellow under different intensities of light
O
D. To determine how long it takes a solution containing algae and the
indicator to turn blue under different intensities of light

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.  

i just calculated it all out, and not including weekends, and all the different days off. as of this school year (2018-2019) students are spending 2198 hours in school this year

c. electrical charges of ionic bonds.