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ss7ja [257]
4 years ago
8

Which boiling point is lower an why?

Chemistry
2 answers:
siniylev [52]4 years ago
8 0

Answer:

4.

Explanation:

Is expected because of the stronger dipole forces in SiH4.

DiKsa [7]4 years ago
3 0

Answer:4

Explanation:

If we carefully observe the electronegativity of the elements in question

P-2.19

N-3.04

C-2.55

Si-1.9

H-2.2

SiH4 is definitely more polar than CH4 hence greater dipole forces of a higher boiling point. NH3 is more polar than PH3 hence NH3 has greater dipole forces and a higher boiling point. Electronegative differences influences the polarity of a bond. The greater the electro negativity difference between bonding atoms, the greater the dipole forces and the greater the boiling point.

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Identify the balanced chemical equation that represents a combustion reaction. 2C 4H 10 + 13O 2 ⟶ 10H 2O + 8CO 2 C 4H 10 + 5O 2
kati45 [8]

Answer:

  2C₄H₁₀ + 13O₂ ⟶ 10H₂O + 8CO₂

Explanation:

  2C₄H₁₀ + 13O₂ ⟶ 10H₂O + 8CO₂  . . . . .  balanced combustion reaction

  C₄H₁₀ + 5O₂ ⟶ 5H₂O + 4CO₂  . . . . not balanced

The two reactions involving Ca are not combustion reactions.

7 0
3 years ago
Heats of reaction calculated from bond energies and from heats of formation are often, but not always, close to each other.a. In
postnew [5]

Answer:

45.7kj

Explanation:

To calculates the heats of reaction from heats of formation:

∆Hr=£∆Hp -£∆Hr

= £∆Hch3ChOH - £∆HCh2h2+h20

=(-235.1kj)-(+52.47kj/kg + (-241.8kj/kg)

∆H = 45.71kj/kg

8 0
3 years ago
On average what is the time between collisions of a xenon atom at 300 K and (a) one torr pressure; (b) one bar pressure.
Amanda [17]

Answer:

(a). 132 × 10^-9 s = 132 nanoseconds.

(b)..176.5 pico-seconds.

Explanation:

(a). At one torr, the first thing to do is to find the speed and that can be done by using the formula below;

Speed = [ (8 × R × T)/ Mm × π]^1/2.

Where Mm = molar mass, T = temperature and R = gas constant.

Speed= [ ( 8 × 8.314 × 300)/ 131.293 × π × 10^-3)^1/2. = 220m/s.

The next thing to do now is to calculate for the degree of collision which can be calculated by using the formula below;

Degree of collision = √2 × π × speed × d^2 × pressure/ K × T.

Note that pressure = 1 torr = 133.32 N/m^2 and d = collision diameter.

Degree of collision = √2 × π × 220 × (4.9 × 10^-10)^2 × 133.32/ 1.38 × 10^-23 × 300.

Degree of collision = 7.55 × 10^6 s^-1.

Thus, 1/ 7.55 × 10^6. = 132 × 10^-9 s = 132 nanoseconds.

(b). At one bar;

1/10^5 × 10^3 × 56.65 = 1.765 × 10^-10 = 176.5 pico-seconds.

6 0
3 years ago
How many mL of 0.25 M NaOH would have 0.18 moles of NaOH?
8_murik_8 [283]

Answer:

720 mL

Explanation:

To answer this problem we'll use the <em>definition of molarity</em>:

  • Molarity = moles / liters

With that in mind we can <u>calculate the volume in liters</u>:

  • 0.25 M = 0.18 moles / liters
  • liters = 0.72 L

Finally we<u> convert liters to mL</u>:

  • 0.72 L * 1000 = 720 mL

Thus 720 mL of 0.25 M NaOH would have 0.18 moles of NaOH.

5 0
3 years ago
Where are the different<br> particles in an atom located and what are their charges?
satela [25.4K]

Explanation:

The different subatomic particles in an atom are the:

  • Protons which are the positively charged particles.
  • Electrons which are the negatively charged particles.
  • Neutrons which do not carry any charges.

Protons and neutrons are located in the nucleus of an atom which is the tiny center of the atom.

Electrons orbits around the nucleus and fill the rest of the volume of atom.

4 0
3 years ago
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