The chemical reaction shown below is carried out in a coffee cup calorimeter . A student mixes 10.0 mL of 0.100 M H 2 A(aq) and 20 mL of 0.100 MNaOH * (aq) , both initially at 25°C. The student records the highest temperature of 40.C for the reaction . H 2 A(aq)+2NaOH(aq) Na 2 A(aq)+2H 2 O(l) AH = ??? KJ/molx a. What indicates that this is an acid -base reaction ? Explain your answer . B. Determine the amount of energy involved in the reaction in the coffee cup calorimeter . The density of the resulting solution is 1.00g / m * L and has the same specific heat capacity as water , 4.2 J/ g °C c. Determine the enthalpy of the reaction , in kJ/mol r* n

1. they vary with a higher number because boiling is way hotter than melting

he would use the colour black

a polar bond is formed when electrons are shared unevenly between atoms

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.