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Allushta [10]
2 years ago
6

Joelle is a manager at a construction company, and she is interested in the chemistry behind the materials they use. She has beg

un studying the materials used to fill walls. She knows that to keep the temperature inside a room steady the material must be a thermal insulator, and she predicts that materials should not be acidic or else they would dissolve too easily in water.
Which of these is a molecular ingredient that could be used in a wall-filling material ?

C27H36N2O10
Na6Ba6
NeNa
HCl
Chemistry
2 answers:
vesna_86 [32]2 years ago
5 0

Answer:

The correct answer is - C27H36N2O10.

Explanation:

C27H36N2O10 is the chemical formula of polyurethane foam which is a linear polymer manufactured by reacting polyols and diisocyanates​. Polyurethane foam is used as a thermal insulator.

It used as filling material for various walls such as partition walls inside your house, determines the maintenance of proper insulation. It is not an acidic material that will dissolve easily. It is used not just as wall-filling material but also for sealer and filling in furniture and carpets.

Guest1 year ago
0 0

it is a

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You wish to make a buffer with pH 7.0. You combine 0.060 grams of acetic acid and 14.59 grams of sodium acetate and add water to
aleksandr82 [10.1K]

Answer:

The pH of the buffer is 7.0 and this pH is not useful to pH 7.0

Explanation:

The pH of a buffer is obtained by using H-H equation:

pH = pKa + log [A⁻] / [HA]

<em>Where pH is the pH of the buffer</em>

<em>The pKa of acetic acid is 4.74.</em>

<em>[A⁻] could be taken as moles of sodium acetate (14.59g * (1mol / 82g) = 0.1779 moles</em>

<em>[HA] are the moles of acetic acid (0.060g * (1mol / 60g) = 0.001moles</em>

<em />

Replacing:

pH = 4.74 + log [0.1779mol] / [0.001mol]

<em>pH = 6.99 ≈ 7.0</em>

<em />

The pH of the buffer is 7.0

But the buffer is not useful to pH = 7.0 because a buffer works between pKa±1 (For acetic acid: 3.74 - 5.74). As pH 7.0 is out of this interval,

this pH is not useful to pH 7.0

<em />

7 0
2 years ago
To produce large tomatoes that are resistant to cracking and splitting some seeds companies use the pollen from one variety of t
rodikova [14]

Answer:

cross pollination

Explanation:

is when two types of plants are mixed to create a better or hardier plant

4 0
2 years ago
Write the balanced chemical equation for the reaction shown.
son4ous [18]

Explanation:

        Carbon                  black sphere

        Nitrogen                blue sphere

        Chlorine                green sphere

        Hydrogen              white sphere

 Reactants:

  three molecules that contain one black sphere and four white spheres

           3CH₄

three molecules that contain two blue spheres and four green spheres:

           3N₂Cl₄

Products:

 three molecules that contain one black sphere and four green spheres:

           3CCl₄

 three molecules that contain two blue spheres:

            3N₂

   six molecules that contain two white spheres

            6H₂

The reaction proper:

                    3CH₄ +      3N₂Cl₄  →   3CCl₄ + 3N₂ + 6H₂

Learn more:

Chemical reactions  brainly.com/question/4216541

#learnwithBrainly

7 0
2 years ago
vanadium has an atomic mass of 50.9415 amu. it has two common isotopes.one isotopes has a mass of 50.9440 amu and a relative abu
Kaylis [27]

Explanation:

Average atomic mass of the  vanadium = 50.9415 amu

Isotope (I) of vanadium' s abundance = 99.75 %= 0.9975

Atomic mass of Isotope (I) of vanadium ,m= 50.9440 amu

Isotope (II) of vanadium' s abundance =(100%- 99.75 %) = 0.25 % = 0.0025

Atomic mass of Isotope (II) of vanadium ,m' = ?

Average atomic mass of vanadium =

m × abundance of isotope(I) + m' × abundance of isotope (II)

50.9415 amu =50.9440 amu× 0.9975 + m' × 0.0025

m'= 49.944 amu

The atomic mass of isotope (II) of vanadium is 49.944 amu.

5 0
2 years ago
A chemist performs the same tests on two homogeneous white crystalline solids, A and B. The results are shown in the table below
Nookie1986 [14]

Solid A contains only Covalent bonds and solid B only contains Ionic bonds. I know this because the appearance, solubility, and conductivity of solid A describes Covalent bonds.

Explanation:

Try this, but idk if it will be marked as correct.

7 0
2 years ago
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