Fireworks exploding in the sky and giving off light are examples of endothermic or exothermic change
1 answer:
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Answer:
See explanation
Explanation:
Two structures are pictured in the image attached, structure 2 is a more stable structure for TeF₄ or TeCl₄ since the lone pair in the structure is present at an equatorial position. Note that the structure of the compound is based on a trigonal bipyramid but of the structure type AX4E, where the lone pair could be positioned at axial or equatorial positions as shown in the images attached.
As a result of repulsion between electron pairs, the bond distance between Te - X(axial) is greater than Te-X (equatorial). This implies that the Te - X(axial) bonds are longer than Te - X(equatorial) bonds.
In answering the question, we must take cognisance of the fact fluorine is more electronegative than chlorine. This implies that fluorine will draw more electron density towards itself than chlorine and this shortens the bond length.
The structures of the both compounds are based on a trigonal bipyramid with a bond angle of 90° for axial position and 120° for the equatorial position.
Owing to the greater electo negativity of fluorine, both the fluorine F-axial and F-equatorial bonds of TeF4 are shorter than the Cl-axial and Cl-equatorial bonds of TeCl4. Hence the axial and equatorial angles in TeF4 are smaller than the axial and equatorial bond angles in TeCl4 due to the greater electro negativity of the fluorine atom.
The image is not given in the question, it is attached below:
<u>Answer:</u> The excess reactant is NO, the limiting reactant is CO and the products are shown in the image attached below.
<u>Explanation:</u>
In the given image:
Red spheres represent oxygen atoms, blue spheres represent nitrogen atoms and black spheres represent carbon atoms
The combination of 1 black and 2 red spheres will represent carbon dioxide compound
The combination of 2 blue spheres will represent nitrogen molecule
The combination of 1 blue and 1 red sphere will represent nitrogen monoxide compound
The combination of 1 black and 1 red sphere will represent nitrogen monoxide compound
Limiting reagent is defined as the reagent which is completely consumed in the reaction and limits the formation of the product.
Excess reagent is defined as the reagent which is left behind after the completion of the reaction.
We are given:
Given moles of NO = 6 moles
Given moles of CO = 4 moles
For the given chemical equation:
By stoichiometry of the reaction:
If 2 moles of CO reacts with 2 moles of NO
So, 4 moles of CO will react with = of NO
As the given amount of NO is more than the required amount. Thus, it is present in excess and is considered as an excess reagent.
Thus, CO is considered a limiting reagent because it limits the formation of the product.
Hence, the excess reactant is NO, the limiting reactant is CO and the products are shown in the image attached below.
Answer:
<em>1) Molecular weight: 18g/mol </em>
<em>Density: at room temperature (25ºC) is 0.997g/mL</em>
<em>Moles: 0.55moles</em>
<em>2) Molecular weight: 182g/mol</em>
<em>Density: at room temperature (25ºC) is 1.11g/mL</em>
<em>Moles: </em>
Explanation:
1) The molecular formula of water is thus, the molecular weight is the sum of the weights of its atoms.
H: 1g/mol x 2 = 2g/mol
O: 16g/mol x 1 = 16g/mol
: 2g/mol + 16g/mol = 18g/mol
The density (δ) of water at room temperature (25ºC) is 0.997g/mL
Therefore, the weight (m) of 1mL of water is:
m = δ.V =
Multiplying the mass by its molecular weight gives the number of moles:
2) The molecular formula of benzophenone is thus, the molecular weight is the sum of the weights of its atoms.
C: 12g/mol x 13 = 156g/mol
H: 1g/mol x 10 = 10g/mol
O: 16g/mol x 1 = 16g/mol
: 156g/mol + 10g/mol + 16g/mol = 182g/mol
The density (δ) of water at room temperature (25ºC) is 1.11g/mL
Multiplying the mass by its molecular weight gives the number of moles: