In order to calculate the heat gained by the water in the calorimeter, the mass of the water must be determined. It will be calculated from the volumes of HCl and NaOH and the density of water, 1.00 g/mL. You should approximate that the density of the NaOH and HCl mixture is equal to the density of water. For each trial, calculate the mass of water in the calorimeter. Report your values to 3 significant figures.

convalent bond :

is a chemical bond formed by the sharing of electron between 2 atoms.

it is the direct chemical bond between 2 atoms.

in bond formation atoms are involved here.

electrovalent bond:

is a chemical bond defined as electroststic attraction between 2 atoms.

it is the electrostatic attraction between 2 atoms.

in bond formation, ions are involved here.

hope it

and ur welcm

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i'm pretty sure its b i might be wrong though!

answer is: nuclear fusion produces elements that are heavier than helium.

nuclei combine to form a heavier nucleus, releasing energy.  

for example, fusion of hydrogen atoms at the sun.  

this fusion nuclear reaction is in the inner core of the sun and hydrogen (atomic number 1) is conveted into helium (atomic number 2).  

the inner core is the central region of the sun and all solar energy is produced in the core by nuclear fusion.