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Otrada [13]
3 years ago
5

How can you find a tutor??​

Chemistry
2 answers:
jarptica [38.1K]3 years ago
8 0

Answer:

You can find tutors in many ways maybe you can find some apps or

you can also ask any family members who live close and ask them there is many ways :)

It sometimes depends on the subject

Can I have brainliest pleasee

yanalaym [24]3 years ago
7 0

Depending on what you are doing, virtual, or in school, you can contact your school and you ask them, or you can have your teacher, based on the subject, tutor you.

<3

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What are the 7 sources of energy?
Oduvanchick [21]

The answer is Solar, Wind, Geothermal, Hydrogen, Tidal, Wave, Hydroelectric, Biomass Energy.

7 0
3 years ago
What mass of potassium hypochlorite (FW-90.6 g/mol) must be added to 4.50 x 10 mL of water to give a solution with pH 10.20? [Ka
marta [7]

Answer : The mass of potassium hypochlorite is, 4.1 grams.

Explanation : Given,

pH = 10.20

Volume of water = 4.50\times 10^2ml=0.45L

The decomposition of KClO  will be :

KClO\rightarrow K^++ClO^-

Now the further reaction with water (H_2O) to give,

ClO^-+H_2O\rightarrow HClO+OH^-

First we have to calculate the pOH.

pH+pOH=14\\\\pOH=14-pH\\\\pOH=14-10.20=3.8

Now we have to calculate the OH^- concentration.

pOH=-\log [OH^-]

3.8=-\log [OH^-]

[OH^-]=1.58\times 10^{-4}M

Now we have to calculate the base dissociation constant.

Formula used : K_b=\frac{K_w}{K_a}

Now put all the given values in this formula, we get :

K_b=\frac{1.0\times 10^{-14}}{4.0\times 10^{-8}}=2.5\times 10^{-7}

Now we have to calculate the concentration of ClO^-.

The equilibrium constant expression of the reaction  is:

K_b=\frac{[OH^-][HClO]}{[ClO^-]}

As we know that, [OH^-]=[HClO]=1.58\times 10^{-4}M

2.5\times 10^{-7}=\frac{(1.58\times 10^{-4})^2}{[ClO^-]}

[ClO^-]=0.0999M

Now we have to calculate the moles of ClO^-.

\text{Moles of }ClO^-=\text{Molarity of }ClO^-\times \text{Volume of solution}

\text{Moles of }ClO^-=0.0999mole/L\times 0.45L=0.0449mole

As we know that, the number of moles of ClO^- are equal to the number of moles of KClO.

So, the number of moles of KClO = 0.0449 mole

Now we have to calculate the mass of KClO.

\text{Mass of }KClO=\text{Moles of }KClO\times \text{Molar mass of }KClO

\text{Mass of }KClO=0.0449mole\times 90.6g/mole=4.07g\approx 4.1g

Therefore, the mass of potassium hypochlorite is, 4.1 grams.

6 0
3 years ago
The equation for photon energy, E , is
Sidana [21]

The wavelength of a photon that has an energy of E = 3.69×10−19 J is 5.42 x 10⁻⁷ m.

<h3>What do you mean by wavelength?</h3>

The space between corresponding points (adjacent crests) in adjacent cycles is known as the wavelength () of a waveform signal that is sent in space or down a wire.

The wavelength can be calculated by the given formula

E = hc/λ

Where,  E is energy = 3.65 x 10⁻¹⁹ J

h is plank's constant = 6.626 x 10⁻³⁴ J.sec

c is speed of light = 2.9 × 10⁸ m/s

Putting the values in the formula

λ = (6.626 x 10⁻³⁴)(2.9 × 10⁸) / (3.65 x 10⁻¹⁹) = 5.42 x 10⁻⁷ m.

Thus, the wavelength, λ is 5.42 x 10⁻⁷ m.

Learn more about wavelength

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4 0
2 years ago
If a rock had a mass of 20g explain how you would fund the density
REY [17]

Answer:

you have to divide it

Explanation:

4 0
2 years ago
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Atoms with a different number of protons than electrons are called:
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Answer:

Hello!!! Princess Sakura here ^^

Explanation:

They are called isotopes.

6 0
3 years ago
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