How many valence electrons would there be for the element with the following orbital diagram?

Are these statements true or false? 1. Two sigma bonds comprise a double bond. 2. A triple bond consists of one pi bond and two

Bond [772]

Answer:

1) False

2) False

3) True

4) True

5) False

Explanation:

1. Two sigma bonds comprise a double bond: False

Two sigma bonds are not possible between two atoms . There will always be one pi bond or two bonds with one sigma bond

2. A triple bond consists of one pi bond and two sigma bonds.

Two sigma bonds are not possible between two atoms . There will always be one pi bond or two bonds with one sigma bond

3. Bonds formed from atomic s orbitals are always sigma bonds. True

There is always an head to head overlapping possible with s orbital

4. A pi bond restricts rotation about the sigma-bond axis.

True.

5. A pi bond consists of two pairs of electrons.

False

Each bond can have one pair of electrons

7 0

3 years ago

Explain in your own words what an atom and element are.

Alisiya [41]

Atoms have the same number of protons and electrons. Elements are a substance that is made entirely from one type of atom

5 0

3 years ago

Enter your answer in the provided box. A person's blood alcohol (C2H5OH) level can be determined by titrating a sample of blood

Annette [7]

Answer: The mass percent of alcohol in blood is 0.183 %

Explanation:

To calculate the moles for given molarity, we use the equation:

$\text{Molarity of the solution}=\frac{\text{Moles of solute}}{\text{Volume of solution (in L)}}$

Molarity of $Cr_2O_7^{2-}$ solution = 0.05961 M

Volume of solution = 35.46 mL = 0.03546 L (Conversion factor: 1 L = 1000 mL)

Putting values in above equation, we get:

$0.05961M=\frac{\text{Moles of }Cr_2O_7^{2-}}{0.03546L}\\\\\text{Moles of }Cr_2O_7^{2-}=(0.05961mol/L\times 0.03546L)=2.11\times 10^{-3}mol$

The given chemical reaction follows:

$16H^+(aq.)+2Cr_2O_7^{2-}(aq.)+C_2H_5OH(aq.)\rightarrow 4Cr^{3+}(aq.)+2CO_2(g)+11H_2O(l)$

By Stoichiometry of the reaction:

2 moles of dichromate ions react with 1 mole of ethanol.

So, $2.11\times 10^{-3}mol$ of dichromate ions will react with = $\frac{1}{2}\times 2.11\times 10^{-3}=1.06\times 10^{-3}mol$

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

Moles of ethanol = $1.06\times 10^{-3}mol$

Molar mass of ethanol = 46.07 g/mol

Putting values in above equation, we get:

$1.06\times 10^{-3}mol=\frac{\text{Mass of ethanol}}{46.07g/mol}\\\\\text{Mass of ethanol}=(1.06\times 10^{-3}mol\times 46.07g/mol)=0.0488g$

To calculate the mass percent of ethanol in blood, we use the equation:

$\text{Mass percent of ethanol}=\frac{\text{Mass of ethanol}}{\text{Mass of blood plasma}}\times 100$

Mass of blood plasma = 26.60 g

Mass of ethanol = 0.0488 g

Putting values in above equation, we get:

$\text{Mass percent of ethanol}=\frac{0.0488g}{26.60g}\times 100=0.183\%$

Hence, the mass percent of alcohol in blood is 0.183 %

5 0

3 years ago

What will 3.20 moles of o2 occupy at stp

ludmilkaskok [199]

The molar volume of any ideal gas at STP condition is 22.4 L

3.20 mol x 22.4L / 1 mol = 71.68 L = 71.7 L

4 0

4 years ago

Moles of Zn(NO3)2 in 131.50g of this substance.

Degger [83]

number of moles= mass / molecular mass
mass=131.50g
molecular mass of Zn(NO3)2 =189.39 g/mol
number of moles = 131.50 g/189.39 g/mol =0.69433 mol

3 0

4 years ago

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