Label each description as ionic, covalent, or both. atoms share pairs of electrons: atoms transfer electrons: atoms have electrostatic attraction: atoms bond together:

Answer :

Atoms share pairs of electrons :  Covalent

Atoms transfer electrons :  Ionic

Atoms have electrostatic attraction :  Ionic

Atoms bond together : Both

Explanation :

Covalent compound : The compounds where the atoms are covalently bonded.  

Covalent bonds are formed by the equal sharing of electrons. These bonds are commonly formed between two non-metals.

Ionic compound : The compounds where the atoms are bonded through ionic bond and atoms are bonded by the electrotstatic attraction.

Ionic bonds are formed by the complete transfer of electrons. The atom which looses the electron is considered as an electropositive atom and the atom which gains the electron is considered as electronegative atom. These bonds are formed between one metal and one non-metal.

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given:

mass of na = 115 g

excess cl2

to determine:

mass of nacl produced

explanation:

given reaction is-

2na(s) + cl2(g) → 2nacl(s)

since cl2 is in excess, na will be the limiting reagent

as per the reaction stoichiometry na: nacl = 1: 1

i.e. moles of na reacted = moles of nacl formed

now, # moles of na = mass of na/atomic mass

                                  = 115 g/23 g.mol-1 = 5 moles

therefore, moles of nacl = 5

molar mass of nacl = 58 g/mol

mass of nacl = 5 moles * 58 g.mol-1 = 290 g

ans: amount of nacl produced = 290 g