Someone pls help me I will make you brain

Given the six solutions, the solution that will separate aqueous barium ion and aqueous lead(II) ion is ammonium chloride.

In qualitative analysis, it is common to separate substances in solution by introducing a solution that preferentially precipitates one of the ions in solutions while leaving the other one in solution.

In this case, we know that all chlorides are soluble except those of lead, mercury and silver according to the solubility rules. Hence, if ammonium chloride is added to a solution of aqueous barium ion and aqueous lead(II) ion, lead II chloride is preferentially precipitated hence the ions are separated.

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Answer:

This equation essentially states that the standard enthalpy change of formation is equal to the sum of the standard enthalpies of formation of the products minus the sum of the standard enthalpies of formation of the reactants. and the standard enthalpy of formation values: ΔH fo[A] = 433 KJ/mol.

Explanation:

Hope this helps.

Answer:

boiling test or melting test

Explanation:

Answer:

Photosynthesis process

Explanation:

Photosynthesis removes carbon dioxide naturally — and trees are especially good at storing carbon removed from the atmosphere by photosynthesis.

Answer: Is it sewage checks

Answer:

Its a physical change I believe

Explanation:

Volume of the regular solid = l × w × h

                                              = (5 cm × 2 cm × 3 cm)

                                              = 30 cm³

Considering the relationship between volume and temperature, a gas under constant pressure can only have its volume reduced as a result of a decrease in its temperature.

According to Charles law, at constant pressure, the volume of a gas is directly proportional to its absolute temperature. Thus:

V1/T1 = V2/T2 where V1 = intial volume, V2 = final volume, T1 = initial temperature, and T2 = final temperature.

In this case, T1 = 59.0, V1 = 30.57, and V2 = 21.14

T2 = 21.14 x 59/30.57

                 = 20.05 K

It can be seen that the temperature of the gas has reduced from 59.0 K to 20.05K.

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Answer:

B) Oxygen

Explanation:

i just took the test.

Any species that contain negative charge over it called anion. Out of sodium, oxygen, argon and calcium, oxygen is the only element that can form anion. So option B is correct option.

Non metals are the element that have property to gain electron.  When any element gain electron then element attain negative charge  and  that element is called anion.

In our question sodium, argon belongs to metals category and these lie on the left side of the periodic table. Metals are meant to release electron and hence become cation.

Argon is non metal but it is a noble gas which has property to not to react as its octet is complete. Thus the only element that is non metal here is Oxygen that forms anion. Its oxidation state is -2. Thus option b is correct option

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Answer:

thank you for the update on

Answer:

es la dos

Explanation:

Answer:

0.225 L = 225 mL

Explanation:

Charles' Law states that for a fixed pressure, the volume is directly proportional to the temperature, which means things expand at the same rate as the rate of it being heated up

Mathematically, we can write that as:

V1/T1 = V2/T2, where 1 and 2 are the two situations

So, when we substitute the values in, we get:

0.25 L/298 K = V2/268 K

Rearranging this, we get:

(0.25/298) x 268 = 0.225 L = 225 mL.

This also makes sense, as the volume reduced a little when the temperature reduced (cooled down)

Let me know if this makes sense, and hope I helped! :)

Answer:Seafloor spreading is a geologic process in which tectonic plates—large slabs of Earth's lithosphere—split apart from each other. Seafloor spreading and other tectonic activity processes are the result of mantle convection. ... The less-dense material rises, often forming a mountain or elevated area of the seafloor.

Explanation:

Brainliest pls

The medullary index of hair is the ratio of medullary diameter to the diameter of hair. Thus the medullary  of  hair with 110 microns and medulla diameter of 58 microns is 0.533. This is an animal hair.

Medullary index of hair is the ratio of diameter of the medullary part and the diameter of the hair strand. From this value, we can identify whether the sample hair is of humans or animals.

Hair is made proteins called keratin. The protein structure of hair vary from human to  human even one hair strand to the other and similar way it is different in animal hair too.

The hair strand of humans are thin than the hair strands of animals. Thus the medullary index of humans is 0.333 or less. If the index is 0.50 or greater it is of animals.

Here the diameter of hair is 110 microns and that of medulla is 58 microns thus medullary index is 58/110 = 0.55 microns. Which means that it is an animal hair.

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Answer:

khi sôi nhiệt độ của nước đạt 100oC, đến lúc này một phần nước sôi sẽ biến thành hơi nước, hơi nước sẽ đùn lên phá vỡ mặt nước và bốc hơi vào không khí, hình thành lên hiện tượng sôi của nước. Nước sôi đánh dấu mốc chuyển đổi trạng thái từ nước (thể lỏng) sang hơi nước (thể khí).

Explanation:

Answer:

80 degrees

Explanation:

Explanation:

Enzyme X works on sugar C substrate.

Answer:

Naturally occurring

Explanation:

please mark me brainliest

Answer:

Streak

Explanation:

Streak is the microscopic remains of minerals in powder form after being rubbed with porcelain plates. The streaks do not have orderly arranged lattice structure or unit cells.

They are randomly arranged and microscopic size powders. The streak of minerals cannot be distinguished easily as it mostly appears similar for all minerals.

Thus, among the given options streak is one in the property of minerals. We can rely upon streaks as it cannot be easily affected by impurities.

answer:

black

Explanation:

black is visible

Answer:

B

Explanation:

i think it is b Intermediate Mg(OH) reacts with H2O to form the reaction products H2 and Mg(OH)2. There are two kinds of reaction channels.

Answer: The amount does not change.

Explanation:

Answer:

118

Explanation:

In the formation of NH₃, -22 kcal are released when 6.0 moles of H₂ react.

Let's consider the thermochemical equation for the formation of ammonia.

3 H₂(g) + N₂(g) → 2 NH₃(g) ΔH = - 11 kcal

As we can see, 11 kcal are released when 3 moles of H₂ react. The heat released when 6.0 moles of H₂ react is:

[tex]6.0molH_2 \times \frac{(-11kcal)}{3molH_2} = -22kcal[/tex]

In the formation of NH₃, -22 kcal are released when 6.0 moles of H₂ react.

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When fossil fuels are burnt, CO2 is released into the air and is taken up by plants during photosynthesis to form glucose and subsequently starch.

Fossil fuels contain a large proportion of carbon atoms. When fossil fuels are burnt, these carbon atoms are released as carbon dioxide and escape to the atmosphere as atmospheric CO2 in air.

Recall that plants take up the CO2 in air during the process of photosynthesis. This CO2 becomes combined with water in the presence of sunlight to form glucose.

This glucose is converted to starch and stored in plant tissues. This is how the  carbon atom inside a fossil fuel  becomes a carbon atom inside a plant.

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Answer:

Sodium chloride is formed when sodium atoms interact with chlorine atoms. When this occurs, sodium will donate an electron (which is a negatively-charged particle) to chlorine. This makes sodium slightly positive and chlorine slightly negative.

Opposite charges attract, right? So then, sodium ions will attract chloride ions and form an ionic bond. By the way, chloride is the term used to designate the anion form of chlorine. The result is a crystallized salt that has properties that are different from the two parent elements (sodium and chlorine). The chemical formula for sodium chloride is NaCl, which means that for every sodium atom present, there is exactly one chloride atom.

Answer:

Explanation:

Most periodic tables have a staircase thick line on their right side. This line separates the metals from the non metals.

O (oxygen) and N (nitrogen) are on the right side of the staircase.

Fe is on the left.

Those elements on the right side of the staircase are non metals.

Those elements on the left of the staircase are metals, so Fe is a metal.

Answer:

by principal quantum number (n) and azimuthal quantum number (l)

Explanation:

I used the web to answer so I'm not sure if this is right