Answer: Option (3) is the correct answer.
Explanation:
A covalent bond is defined as the bond formed by sharing of electrons. A single covalent bond involves only two electrons.
When four electrons are shared unequally between two atoms then it results in the formation of a double bond.
And, when six electrons are shared unequally then it results in the formation of a triple bond.
It is true that a single covalent bond is weaker than a double covalent bond. Also, a triple covalent bond is stronger than a single covalent bond.
Therefore, we can conclude that the statement four electrons are shared unequally between two different atoms, is INCORRECT concerning a single bond that is polar.
Answer:
Explanation:
The properties of covalent bonds are:
1. Low boiling points and melting points.
2. Various colors.
3. Poor conductors of heat and electricity.
4. Brittle solids.
Answer:
35.453 g
Explanation:
one mole of chlorine is 34.453 g
Explanation:
We have to find the number of molecules that are present in 0.54 g of Ca(NO₃)₂.
First we have to convert the mass of our sample into moles of Ca(NO₃)₂. We will use the molar mass of Ca(NO₃)₂ to do that.
molar mass of Ca = 40.08 g/mol
molar mass of N = 14.01 g/mol
molar mass of O = 16.00 g/mol
molar mass of Ca(NO₃)₂ = 1 * 40.08 g/mol + 2 * 14.01 g/mol + 6 * 16.00 g/mol
molar mass of Ca(NO₃)₂ = 164.10 g/mol
mass of Ca(NO₃)₂ = 0.54 g
moles of Ca(NO₃)₂ = 0.54 g * 1 mol/(164.10 g)
moles of Ca(NO₃)₂ = 0.00329 moles
According to Avogadro's number there are 6.022 *10^23 molecules in 1 mol of molecules. We can use that relationship to find the number of molecules that are present in our sample.
6.022 *10^23 molecules = 1 mol
molecules of Ca(NO₃)₂ = 0.00329 moles * 6.022 *10^23 molecules/(1 mol)
molecules of Ca(NO₃)₂ = 2.0 * 10^21 molecules
Answer: there are 2.0 * 10^21 molecules of Ca(NO₃)₂ in 0.54 g of it.
