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Answer:

[tex][OH^-]=2.455x10^{-3}M[/tex]

Explanation:

Hello there!

In this case, since a strong base produce OH ions in solution, it possible to first compute the pOH as shown below:

[tex]pH+pOH=14\\\\pOH=14-pH\\\\pOH=14-11.39\\\\pOH=2.61[/tex]

Thus, via the definition of the pOH we can compute the concentration of the strong base as follows:

[tex]pOH=-log([OH^-])[/tex]

Thus, solving for the concentration we obtain:

[tex][OH^-]=10^{-pOH}=10^{-2.61}[/tex]

[tex][OH^-]=2.455x10^{-3}M[/tex]

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Explanation:

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I already solved it in the pic I uploaded

1. Dependant Variable

2. Scientific Method

3. Data

4. Consistency

5. Metric Balance

6. Mean

7. Technology

8. Dependant Variable

9. Hypothesis

10. Spring Scale

Hello! I hope this helped and please correct me if some are wrong. I did my research and matched them. Have a good one!

Answer:

hope it is helpful to you

Answer:

Option C. Na⁺(aq) and Cl¯(aq)

Explanation:

From the question given above, we obtained the following:

Na₂SO₄(aq) + CaCl₂(aq) —> CaSO₄(s) + 2NaCl(aq)

Ionic Equation:

2Na⁺(aq) + SO₄²¯(aq) + Ca²⁺(aq) + 2Cl¯(aq) —> CaSO₄(s) + 2Na⁺(aq) + 2Cl¯(aq)

From the ionic equation above, we can see that Na⁺(aq) and Cl¯(aq) are present on both side of the equation.

Therefore, Na⁺(aq) and Cl¯(aq) are the spectator ions because they did not participate directly in the reaction.

Answer:

C3H8 + 502 ----> 3CO2 + 4H20

Explanation:

Answer: To be separated using GC, analytes must be volatile.

An air peak is commonly used to determine the dead time when using a TCD detector.

An FID is insensitive to non-combustible gases such as water and carbon dioxide.

A column temperature equal to or slightly above the average boiling point of the sample components results in a reasonable elution time.

Explanation:

The gas chromatography works on the principle of separation of gaseous substances based on the differences of vapor pressure. The thermal conductivity detector works on the principle of detection of effluents from the has chamber and the air peak gives indication of the retention time of the effluents. Flame ionization detector can be used for the detection of organic compounds but insensitive for the detection of halogens, non-combustible substances like carbon dioxide and water. The temperature of the column is kept higher than the average boiling point of the substance so as to attain separation of substances by the differences in the elution time.

Answer:

Option 3 is correct.

The atomic nucleus of each element has a unique number of protons. Therefore, the energy of the electron layers of the atoms of each element is unique.

If we have the energy released from each electron transfer between the layers of the atom, we can identify the element.

Answer:

Fe2Cl + Chlorine

Explanation:

Fe2Cl2

Answer:

From Hawaii’s Maunakea, astronomers around the world use W. M. Keck Observatory to observe the universe with unprecedented power and precision.

The twin Keck Observatory telescopes are the world’s most scientifically productive optical and infrared telescopes. Each telescope weighs 300 tons and operates with nanometer precision. The telescopes’ primary mirrors are 10-meters in diameter and are each composed of 36 hexagonal segments that work in concert as a single piece of reflective glass.

In the middle of the Pacific Ocean, Hawaii Island is surrounded by thousands of miles of thermally stable seas. The 13,796-foot Maunakea summit has no nearby mountain ranges to roil the upper atmosphere. Few city lights pollute Hawaiian night skies, and for most of the year, the atmosphere above Maunakea is clear, calm and dry -— offering the best seeing on Earth.

Answer:

give them brainliest

Explanation:

Answer:

23

Explanation:

The concentration of the solution is given as the ratio of the moles and the volume of the solution. The concentration of hydrogen fluoride is 50 M.

Molarity is the colligative property that is expressed in the terms of the moles of the solute expressed per liter of solution. It is given by the formula:

[tex]\rm Molarity = \rm \dfrac{\text{moles of solute}}{ \text{liters of solution}}[/tex]

Given,

Volume of solution (V) = 0.5 L

Moles of the solute (n) = 25 moles

Molar concentration (M) = ?

Substituting values in the equation we get:

[tex]\begin{aligned} \rm M &= \rm \dfrac{n}{V}\\\\&= \dfrac{25}{0.5}\\\\&= 50\end{aligned}[/tex]

Therefore, 50 M is the concentration of 25 mol Hydrogen fluoride.

Learn more about molarity here:

https://brainly.com/question/13565497

Answer:

i

Explanation:

Answer:1

Explanation:v

Answer:

32 mL

Explanation:

To answer this question we'll use Charles' law, which relates the temperature and volume of a gas at constant pressure:

V₁T₂=V₂T₁

Now we convert the given temperatures to K:

And given that V₁ = 45 mL, we can input the data:

And solve for V₂:

Answer and Explanation:

Heat required to raise the temperature of the unit mass of a given substance by a given amount (usually one degree).

Answer:

the heat required to raise the temperature of the unit mass of a given substance by a given amount (usually one degree)

Hope it helps!!

Answer:

1s22s2

Explanation:

Answer:

The white stuff we know as sugar is sucrose, a molecule composed of 12 atoms of carbon, 22 atoms of hydrogen, and 11 atoms of oxygen (C12H22O11). Like all compounds made from these three elements, sugar is a carbohydrate.

Explanation:

Answer and Explanation:

Photosynthesis reaction involves two reactants, carbon dioxide and water. These two reactants yield two products, namely, oxygen and glucose.

Answer:

they do fall off of themselves

Answer:

True!

Explanation:

They usually fall off in the winter

Answer:

2.28bar

Explanation: Boyle's law P1V1=P2V2 manipulate formula in favor of V2 the new formula should beP1V1/V2

0.895*318/125=2.2768 but to same sigfig it is 2.28

Answer:

1.89 mol

Explanation:

in 250 g of ammonium sulfate 1.89 moles are present

Answer:

(CH2CH3).

!

CH-CH-CH-CH=CH-CH2-CH2-CH3

!

(CH2CH3)

2, 3-diethyl–4-octene

i am not sure.

Answer:

similarities: they both carry a charge

differences:

polyatomic ion- composed of more than one atom

monatomic ion- composed in a single atom.

Answer:

carbon

Explanation:

The properties of carbon forms the basis for all life. Explanation: The atoms of carbon are found in the molecules of all living species.

Answer:

It has reaced thermal equlibrum

Answer:

created nor destroyed.

Answer:

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Answer:

Happy Birthday HAHAHAHAHAYAHYAHAHAH

Phenacetin is the ether-containing analgesic drug that is likely to contribute to the death of famous aviator Howard Hughes.

It is a drug used for relieving pain and reducing fever.

It was taken off the market as a medicine in the 1970s because it was deemed hazardous.

This was the reason for the death of the famous aviator Howard Hughes.

The chemical formula of [tex]\rm C_1_0H_1_3NO_2[/tex].

Thus, the correct option is C, phenacetin.

Learn more about phenacetin

https://brainly.com/question/6993133

Answer:

A

Explanation:

the kinetic energy also depends on mass so kinetic energy remains constant as mass and speed are constant