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ahrayia [7]
2 years ago
5

Walls made of paraffin wax, a covalent compound, help keep the temperature in a room steady as night changes into day and day in

to night. What is the most important property of covalent compounds that allows paraffin wax to help keep a room’s temperature level? The wall would not absorb or release any heat energy from the room or outside, so it would not affect the room’s temperature. The wall would not absorb heat during the day, but at night it would release heat that naturally exists inside of most covalent compounds. The wall would absorb extra heat during the day when the sun is out, then release the heat back into the room when the sun goes down. The wall would absorb extra heat during the day, and the wall would hold this heat in so that it cannot absorb any more heat from the night air.
Chemistry
2 answers:
Over [174]2 years ago
8 0
The wall would absorb extra heat during the day when the sun is out, then release the heat back into the room when the sun goes down.
MAXImum [283]2 years ago
7 0

Answer: Option (c) is the correct answer.

Explanation:

Covalent compounds are the compounds in which atoms combine by sharing of electrons.

These compounds have weak forces of attraction and therefore, they easily heat up and thus, have low melting and boiling point.

Hence, the most important property of covalent compounds that allows paraffin wax to help keep a room’s temperature level is that the wall would absorb extra heat during the day when the sun is out, then release the heat back into the room when the sun goes down.

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What is the pH of a solution made by mixing 15.00 mL of 0.100 M HCl with 50.00 mL of 0.100 M KOH? Assume that the volumes of the
denis23 [38]

Answer:

The correct answer is: pH = 12.73

Explanation:

The <em>neutralization reaction</em> between HCl and KOH is given by the following chemical equation:

HCl + KOH ⇒ KCl + H₂O

Since HCl is a strong acid and KOH is a strong base, HCl is completely dissociated into H⁺ and Cl⁻ ions, whereas KOH is dissociated completely into K⁺ and OH⁻ ions.

For acids, the number of equivalents is given by the moles of H⁺ ions (in this case: 1 equivalent per mol of HCl). For bases, the number of equivalents is given by the moles of OH⁻ ions (in this case: 1 equivalent per mol of KOH).

The H⁺ ions from HCl will react with OH⁻ ions of KOH to give H₂O. The pH is calculated from the difference between the equivalents of H⁺ and OH⁻:

equivalents of H⁺= volume HCl x Molarity HCl

                            = (15.0 mL x 1 L/1000 mL) x 0.100 mol/L

                            = 1.5 x 10⁻³ eq H⁺

equivalents of OH⁻= volume KOH x Molarity KOH

                               = (50.0 mL x 1 L/1000 mL) X 0.100 mol/L

                               = 5 x 10⁻³ eq OH⁻

There are more OH⁻ ions than H⁺ ions. The excess of OH⁻ (that did not react with H⁺ ions) is calculated as follows:

OH⁻ ions= (5 x 10⁻³ eq OH⁻) -  (1.5 x 10⁻³ eq H⁺) = 3.5 x 10⁻³ eq OH⁻= 3.5 x 10⁻³ moles OH⁻  

As the volumes of the solutions are additive, the total volume of the solution is:

V= 15.0 mL + 50.0 mL = 65.0 mL= 0.065 L

So, the concentration of OH⁻ ions in the solution is given by:

[OH⁻] = moles OH⁻/V= (3.5 x 10⁻³ moles OH⁻)/0.065 L = 0.054 mol/L = 0.054 M  

From  [OH⁻], we can calculate pOH:

pOH = -log [OH⁻] = -log (0.054) = 1.27

Finally, we know that pH + pOH= 14; so we calculate pH:

pH= 14 - pOH = 14 - 1,27 =  12.73                                                            

8 0
2 years ago
Convert 26.02 x 1023 molecules of C2H8 to grams. Round your answer to the hundredths place.
aliina [53]

Answer:

x= 138.24 g

Explanation:

We use the avogradro's number

6.023 x 10^23 molecules -> 1 mol C2H8

26.02 x 10^23 molecules -> x

x= (26.02 x 10^23 molecules  * 1 mol C2H8 )/6.023 x 10^23 molecules

x= 4.32 mol C2H8

1 mol C2H8     -> 32 g

4.32 mol C2H8 -> x

x= (4.32 mol C2H8 * 32 g)/ 1 mol C2H8

x= 138.24 g

4 0
2 years ago
In this lab, you will do experiments to identify types of changes. Using the question format you learned (shown above), write an
Vlad1618 [11]

Answer:

How can you distinguish a physical change from a chemical change?

Explanation:

4 0
2 years ago
HCN forms when synthetic fibers containing Orlon® or Acrilan® burn. Acrilan® has an empirical formula of CH2CHCN, so HCN is 50.9
hichkok12 [17]

Answer:

676 g

Explanation:

First, let's calculate the area of the rug: 3.70x4.20 = 15.54 m². Knowing that 1 yard has 0.9144 m, so

1 yd² = (0.9144 m)² = 0.8361 m²

So, there is 30.0 oz in 0.8361 m²

30.0 oz-----------------0.8361 m²

x           -----------------15.54 m²

By a simple direct three rule:

0.8361x = 466.2

x = 557.6 oz of Acrilan in the rug

1 oz =  28.35 grams, so 557.6 oz = 15807.96 g

The potencial of HCN is 50.9% of this mass, so: 0.509x15807.96 = 8046.25 g.

But only 42.0% of the rug is burned, so the potencial of HCN is 42.0% of  8046.25: 0.42x 8046.25 = 3379.42 g.

And the yield is only 20.%, so the mass formed of HCN is:

0.20x3379.42 = 676 g

5 0
2 years ago
The heat of combustion of propane, C3H8, is 2220 kJ/mol. The specific heat of copper is 0.385 J/g°C. How many grams of propane m
Mamont248 [21]

Answer:

Explanation:

q = (mass) (temp change) (specific heat)

q = (10000 g) (40 °C) (0.385 J/g⋅°C) = 154000 J = 154 kJ

154 kJ / 2220 kJ/mol = 0.069369369 mol

0.069369369 mol times 44.0962 g/mol = 3.06 g (to three sig figs)

answer choice 4

5 0
2 years ago
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