Moles = mass / Mr
= 0.4243 / 100.1
= 4.239 x 10⁻³ mole of CaCO₃
Answer:
A. its reactivity
Explanation:
It's reactivity because copper was exposed to air and if it is reactivity it must be exposed to air
Yes, the law of thermodynamics, or Law of Conservation of Energy
Answer :
Lewis-dot structure : It shows the bonding between the atoms of a molecule and it also shows the unpaired electrons present in the molecule. The electrons are represented by dot.
The given molecule is, perbromate ion.
Bromine has '7' valence electrons and oxygen has '6' valence electron.
Therefore, the total number of valence electrons in perbromate ion,
= 7 + 4(6) + 1 = 32
According to Lewis-dot structure, there are 14 number of bonding electrons and 18 number of non-bonding electrons.
Formula for formal charge :
![\text{Formal charge on }Br=7-0-\frac{14}{2}=0](https://tex.z-dn.net/?f=%5Ctext%7BFormal%20charge%20on%20%7DBr%3D7-0-%5Cfrac%7B14%7D%7B2%7D%3D0)
The Lewis-dot structure of perbromate ion is shown below.
Answer:
Carbon and Oxygen cannot react to form an ionic compound because the two elements are non-metals. To form an ionic bond, a metal combines with a non-metal through electrostatic attraction of oppositely charged ions.