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2 years ago

What is the function of an arrow ( -7) and a plus sign ( ) in a chemical equation?

1 answer:

3 0

The plus sign is to show that something is added

the arrow is to show the products, which are the things you get at the end

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In a system with 4 atoms and 1 lone pair, predict whether the lone pair will be in a B site or an A site? Explain.

Maslowich

Answer:

Explanation:

The compound corresponds to a molecule AX4E where A is the Central atom, X are the other atoms present and E is the lone pair of electrons.

The shape of this molecule is based on a trigonal bipyramid since the molecule contains five electron domains.

Since there are four bond pairs and one lone pair, the molecular geometry is see-saw with equatorial bond angle <120° and axial bond angle <90°.

For AX4E (five electron pairs), the lone pair should occupy an equatorial position instead of an axial position since the equatorial position has two neighboring electron pairs that are positioned at about 90° apart from each other and two other neighboring electron pairs that are positioned at 120° from each other. The axial position has 3 neighboring electron pairs positioned at 90° from each other and another neighboring electron pair positioned at 120°. Hence the equatorial position experiences lesser repulsion compared to the axial position.

Hence in the structure pictured in the question, position B is a preferred position for the lone pair instead of position A.

8 0

2 years ago

A flask of fixed volume contains 1.0 mole of gaseous carbon dioxide and 88 g of solid carbon dioxide. The original pressure and

lianna [129]

Answer:

The correct option is: C. 250 K

Explanation:

Given: Before Sublimation-

Initial Temperature: T₁ = 300 K, Initial Pressure: P₁ = 1 atm, Initial number of moles of gas: n₁ = 1 mol, given mass of solid Carbon dioxide: w = 88 g

After Sublimation-

Final Pressure: P₂ = 2.5 atm, Final number of moles of gas: n₂ = ? mol

Final Temperature: T₂ = ? K,

Also, Volume is constant, Molar mass of Carbon dioxide: m = 44 g/mol

As we know,

The number of moles:

$n = \frac {given\: mass\: (w)} {Molar\: mass\: (m)}$

So the number of moles of carbon dioxide sublimed:

$n = \frac {w}{m} = \frac {88\: g} {44\: g/mol} = 2 mol$

Therefore, the final number of moles of gas after sublimation:

$n_{2} = n_{1} + n = 1\: mol + 2\: mol = 3\: mol$

According to the Ideal gas equation:

$P.V = n.R.T$

$or, \frac {P_{1}.V_{1}}{n_{1}.T_{1}} = \frac {P_{2}.V_{2}}{n_{2}.T_{2}} \: \: \: \: \: \: ....equation\: (1)$

Since the volume is constant, so the equation (1) can be written as:

$\frac {P_{1}}{n_{1}.T_{1}} = \frac {P_{2}}{n_{2}.T_{2}}$

$\Rightarrow \frac {1\:atm}{1\:mol \times 300\:K} = \frac {2.5\:atm}{3\:mol \times T_{2}}$

$\therefore T_{2} = \frac {2.5\:atm \times 300\:K \times 1\:mol}{3\:mol \times 1\:atm}$

$\Rightarrow T_{2} = 250\:K$

Therefore, the final temperature: T₂ = 250 K

6 0

1 year ago

The small intestine shown below contains lymphatic vessels but no capillaries. Which nutrient will be absorbed by this small int

Bumek [7]

Answer:

fatty acids

Explanation:

8 0

1 year ago

Read 2 more answers

Why are metallic crystals malleable and ductile? A. The electrons are free floating, allowing them to move with the atoms when t

jok3333 [9.3K]

Answer:

D. The atoms are arranged with alternating positive and negative charges. When struck, the lattice shifts putting positives against positives and negatives against negatives.

Explanation:

Metallic crystals takes their properties as a result of metallic bonds in between the atoms.

Metallic bond is actually the attraction between the positive nuclei of all the closely packed atoms in the lattice and the electron cloud jointly formed by all the atoms by losing their outermost shell electrons this is by virtue of their low ionization energy.

Physical properties of metals such as malleability, ductility, electrical conductivity, etc can be accounted for by metallic bonds.

7 0

2 years ago

Nh4i(aq)+koh(aq)→ express your answer as a chemical equation. identify all of the phases in your answer.

tester [92]

NH4I (aq) + KOH (aq) in chemical equation gives

NH4I (aq) + KOH (aq) = KI (aq) + H2O(l) + NH3 (l)

Ki is in aqueous state H2o is in liquid state while NH3 is in liquid state

from the equation above 1 mole of NH4I (aq) react with 1 mole of KOH(aq) to form 1mole of KI(aq) , 1mole of H2O(l) and 1 Mole of NH3(l)

5 0

2 years ago

Read 2 more answers