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2 years ago

The substances that are chemically bound together are

Chemistry

1 answer:

pshichka [43]2 years ago

4 0

Answer:

Select one of the readings in this unit and in at least one hundred words, discuss how immediacy, foreshadowing, and commentary work to show author's purpose, meaning, or tone and style.

Explanation:

Select one of the readings in this unit and in at least one hundred words, discuss how immediacy, foreshadowing, and commentary work to show author's purpose, meaning, or tone and style.

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The carbon-carbon (C―C) bond has an average bond energy of 347 kJ/mol, which is the energy required to break one mole of C―C bon

olganol [36]

Answer:

(3) 345 nm

Explanation:

Given:

Average C-C bond energy = 347 kJ/mol

To determine:

Wavelength of photon that can break a C-C bond

Calculation:

The energy (E) of a photon is related to its wavelength (λ) by the Planck's equation:

$E = \frac{hc}{\lambda }$

where h = Planck's constant = 6.626*10⁻³⁴ Js

c = speed of light = 3*10⁸ m/s

$\lambda = \frac{hc}{E}$

$\lambda =\frac{6.626*10^{-34}Js*3*10^{8}ms^{-1}*6.023*10^{23}mol^{-1}}{347,000Jmol^{-1}}$

λ = 3.45*10⁻⁷ m

Since 1 nanometer (nm) = 10⁻⁹ m

The calculated wavelength corresponds to 345 nm

6 0

3 years ago

For liquids, which of the following factors affect vapor pressure? Check all that apply: volume temperature

In-s [12.5K]

I believe the correct answer from the choices listed above is the second option. For liquids, it is the temperature that affects vapor pressure. The vapor pressure of any substance increases non-linearly with temperature according to the Clausius–Clapeyron relation. Hope this helps. Have a nice day.

5 0

3 years ago

Compare and contrast Aufbau principle and the Pauli exclusion principle.

lapo4ka [179]

Answer: Pauli exclusion principle: only two electrons can occupy the same orbital and they must have opposite spin directions

Explanation:

6 0

3 years ago

4. A sample of gas has a pressure of 700 mmHg and 30.0°C. Ar what temperature would the pressure be 600 mmHg if the volume remai

shtirl [24]

Answer:

T₂ = 259.84 K

T₂ = -13.31 °C

Explanation:

Given data:

Initial pressure = 700 mmHg

Initial temperature = 30.0°C (30+273.15 K = 303.15 K)

Final temperature = ?

Final pressure = 600 mmHg

Solution:

According to Gay-Lussac Law,

The pressure of given amount of a gas is directly proportional to its temperature at constant volume and number of moles.

Mathematical relationship:

P₁/T₁ = P₂/T₂

Now we will put the values in formula:

700 mmHg /303.15 K = 600 mmHg / T₂

T₂ = 600 mmHg × 303.15 K / 700 mmHg

T₂ =181890 mmHg.K /700 mmHg

T₂ = 259.84 K

Temperature in celsius

259.84 K - 273.15 = -13.31 °C

7 0

2 years ago

A truck is moving at the rate of 40 km/hr. How far does it move when it stops after 5 seconds?

seraphim [82]

First of all, this is the chemistry section, while your question is a physics question. Anyway I'll tell you how to solve it.

First we need to find the rate that the truck moves in a second.

1km = 1000m
40km = 40000m
40000m/hr
1 hour = 60 minutes
40000m/hr ÷ 60 = 666.66(repeating)/minute
1 minute = 60 seconds
666.66m/min ÷ 60 = 11.11(rep)m/s

Next we simply multiply the speed of the truck by the number of seconds it travels.

11.11 × 5 = 55.55
Make sure to round it unless you indicate the repeating decimal.
The truck moved 55.56m in 5 seconds.

6 0

2 years ago