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3 years ago

Which shows zero as significant digits?check all that apply.

1 answer:

8 0

- any zeroes between 2 non-zeroes
- any zeroes after non-zeroes in a number without a decimal point are sig figs

These are NOT:

- any zeroes before non-zeroes
- any zeroes after non-zeroes in a number without a decimal point

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A central atom has two lone pairs on opposite sides and four single bonds. What is the molecule geometry of the result?

ryzh [129]

The molecular geometry is square planar.

According to the Valence Shell Electron Pair Repulsion theory (VSEPR), the shape of a molecule is determined by the number of valence electrons surrounding the outermost shell of the central atom in the molecule.

In this case, the expected geometry based on VSEPR theory is octahedral. However, the lone pairs on opposite sides of the four single bonds leads to a square planar molecular geometry.

Learn more; brainly.com/question/24396703

8 0

3 years ago

The most negative electron affinity is most likely associated with which type of atoms?

kifflom [539]

The answer would be small nonmetal atoms

4 0

3 years ago

Calculate the vapor pressure (in torr) at 298 K in a solution prepared by dissolving 46.8 g of the non-volatile non-electrolye g

Rainbow [258]

Answer: The total partial pressure of the solution is 131.37 torr.

Explanation:

The number of moles is defined as the ratio of the mass of a substance to its molar mass. The equation used is:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ ......(1)

For glucose:

Given mass of glucose = 46.8 g

Molar mass of glucose = 180 g/mol

Plugging values in equation 1:

$\text{Moles of glucose}=\frac{46.8g}{180g/mol}=0.26 mol$

For methanol:

Given mass of methanol = 117 g

Molar mass of methanol = 32 g/mol

Plugging values in equation 1:

$\text{Moles of methanol}=\frac{117g}{32g/mol}=3.66 mol$

Mole fraction is defined as the moles of a component present in the total moles of a solution. It is given by the equation:

$\chi_A=\frac{n_A}{n_A+n_B}$ .....(2)

where n is the number of moles

Putting values in equation 2:

$\chi_{methanol}=\frac{3.66}{0.26+3.66}=0.934$

Raoult's law is the law used to calculate the partial pressure of the individual gases present in the mixture. The equation for Raoult's law follows:

$p_A=\chi_A\times p_T$ .....(3)

where $p_A$ is the partial pressure of component A in the mixture and $p_T$ is the total partial pressure of the mixture

We are given:

$p_{methanol}=122.7torr\\\chi_{methanol}=0.934$

Putting values in equation 3, we get:

$122.7torr=0.066\times p_T\\\\p_T=\frac{122.7torr}{0.934}=131.37torr$

Hence, the total partial pressure of the solution is 131.37 torr.

3 0

3 years ago

Use molecular orbital theory to determine whether He2 2+ or He2 + is more stable. Use molecular orbital theory to determine whet

julia-pushkina [17]

Answer:

The He₂ 2+ ion is more stable since it has a higher bond order (bond order = 1) than the He₂ + ion (bond order = 1/2).

Explanation:

Molecular orbital of He₂⁺

$1\sigma_{1s}^21\sigma(star)_{1s}^1$

There are two electrons in bonding and 1 electron in antibonding orbital

Bond order = $\frac{(2-1)}{2}$

= $\frac{1}{2}$

Molecular orbital of He₂⁺²

$1\sigma_{1s}^21\sigma(star)_{1s}^0$

There are two electrons in bonding and 0 electron in antibonding orbital

Bond order = $\frac{(2-0)}{2}$

= 1

So bond order of He₂⁺² is 1 which is more stable than He₂⁺ whose bond order is $\frac{1}{2}$ .

7 0

3 years ago

Match each vocabulary word with its definition. match the items in the left column to the items in the right column. 1 . periodi

Angelina_Jolie [31]

Answer:

Explanation:

1 . periodicity

repeating nature of atomic structure

Periodicity is the repeating nature or trend of an atom on the periodic table. Periodicity can be inform of ionization energy, atomic radius, nuclear charge etc.

2 . shell

location of an electron

Electrons are located in shells. It is where electrons are found in an atom and the probability of finding electrons there are high

3 . non-metals

high ionization energies

Non-metals have high ionization energies which is the energy required to remove a loosely bonded electron in an atom. Metals have low ionization energies.

4 . noble gases

least reactive family

Noble gases are called inert gases. They have complete electronic configuration and this makes them unreactive.

5 . neutral

charge on a neutron

Neutrons have no charge on them. They are subatomic particles found in the nucleus alongside the protons

6 . repel

like charges

Like charges repel one another

7 . attract

unlike charges

Unlike charges attracts. Positve attracts negative charges.

7 0

3 years ago

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