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2 years ago

How are you guys today? o.0

Chemistry

2 answers:

aev [14]2 years ago

4 0

Answer:

you dont want to know

Explanation:

Lady_Fox [76]2 years ago

3 0

Answer:

not the best but that is alright

Explanation:

how is your day :)

You might be interested in

Sodium acetate spontaneously crystallizes out of a supersaturated solution upon standing or upon the addition of a seed crystal.

AlekseyPX

Answer:

Option (c) is correct.

Explanation:

According to 2nd law of thermodynamics, every spontaneous process is associated with increase in entropy ( $\Delta S>0$ ).

As sodium acetate crystallizes out spontaneously therefore it is associated with $\Delta S>0$ .

During crystallization, bond formation takes place which results evolution of heat. In other words, crystallization phenomenon is exothermic ( $\Delta H$ ).

So, the given crystallization process renders the following thermodynamic quantities- $\Delta S>0$ J/K and $\Delta H$ J

Option (c) is correct.

6 0

2 years ago

I need help on either question you can answer. Thank you god bless

Stels [109]

<h3>Further explanation</h3>

1.Atomic Number (Z) = Mass Number (A) - Number of Neutrons

neutrons = mass number-atomic number

Atomic mass Cl-37= 17

Mass number Cl-37=37

Neutrons = 37-17=20

2. Mass atom X = mass isotope 1 . % + mass isotope 2.%...

$\tt atomic~mass~X=0.0224\times 88+0.7832\times 90+0.1944\times 91=90.1$

3. The energy in one photon can be formulated as

$\large{\boxed{\bold{E\:=\:h\:.\:f}}}$

f = c / λ, so :

$\tt E\approx f\approx \dfrac{1}{\lambda}$

Energy is directly proportional to frequency and inversely proportional to the wavelength

So, as the frequency of photon increases, the energy of photon increases

4. Based on answer number 3 :

A. The wavelength becomes longer, and the energy decreases

7 0

2 years ago

The photodissociation of ozone by ultraviolet light in the upper atmosphere is a first-order reaction with a rate constant of 1.

atroni [7]

Answer:

[O₃]= 8.84x10⁻⁷M

Explanation:

The photodissociation of ozone by UV light is given by:

O₃ + hν → O₂ + O (1)

The first-order reaction of the equation (1) is:

$rate = k [O_{3}] = - k \frac{\Delta [O_{3}]}{\Delta t}$ (2)

where k: is the rate constant and Δ[O₃]/Δt: is the variation in the ozone concentration with time, and the negative sign is by the decrease in the reactant concentration

We can get the following expression of the first-order integrated law of the reaction (1), by resolving the equation (2):

$[O_{3}]_{t} = [O_{3}]_{0} \cdot e^{-kt}$ (3)

where [O₃](t): is the ozone concentration in the elapsed time and [O₃]₀: is the initial ozone concentration

We can calculate the initial ozone concentration using equation (3):

$[O_{3}]_{t} = 5.0 \cdot 10^{-3}M \cdot e^{-(1.0\cdot 10^{-5}s^{-1}) (\frac{10d \cdot 24h \cdot 3600 s}{1d \cdot 1h})} = 8.84 \cdot 10^{-7}M$

So, the ozone concentration after 10 days is 8.84x10⁻⁷M.

I hope it helps you!

3 0

3 years ago

Select from the drop-down menu to correctly complete the statement.

Alenkasestr [34]

Answer:

C. have specific jobs

Explanation:

If an organism has specialized cells, then the cells performs specific jobs.

A group of cells that performs a specific job is called tissues.

In higher organisms, cells are specialized for specific purposes in them.
This is to ensure that cells are optimized to carry out certain functions.
Specialization of cells usually occurs by cellular differentiation when an organism begins to form.

7 0

3 years ago

7. How many grams are contained in 3.9 x 1023 sulfur atoms? atoms → moles grams I

Anni [7]

Answer: 20.775 g S

Explanation: 3.9x10^23 atoms = 0.648 mol

Atomic mass S = 32.08

S in grams = 20.775

4 0

2 years ago