A+chemist+wants+to+mix+an+8%+salt+solution+with+a+20%+salt+solution+to+obtain+12+liters+of+an+18%+salt+solution.+how+much+of+the+20%+solution+should+she+use?

Answer:

when we drink the milk the digestive system produce protease enzyme to break down the protein of milk.

Answer:

This option is correct

Explanation:

Molecules are expressed in the form of Lewis in order to simplify their expression or chemical study, but this does not mean that they manifest or respect this form in all three dimensions since some are generally unstable, or even in the third dimension, these locations between atoms are respected for the characteristics of their unions.

The degrees of the vibrational freedom does Al₂Cl₆ is 18.

For the vibrational degrees of freedom of the molecule is as :

f = 3N - 6 - L

Where

f  = the number of vibrational degrees of the freedom,

N = the total number of the atoms in the molecule,

L = the number of the constraints or the restrictions

For the aluminum chloride,

N = 2 ( the two aluminum atoms) + 6 ( the six chlorine atoms) = 8.

The molecule has the  D3h symmetry, which will imposes some of the constraints in the vibrational motion of the molecule.

f = 3N - 6 - L

f = 3(8) - 6 - 5

f  = 18

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Michael Faraday discovered electromagnetic induction. This discovery changed the field of electrical power generation and transmission, shaping modern electrical technologies.

Answer:5600 years

Explanation:

the amount of time it takes for the quantity to lose 50% (Half life) of its value. The half-life of carbon-14 is about 5600 years. Thus, after 5600 years, a piece of cotton cloth will contain half the carbon-14 that was in the original cotton plant.

The partial pressure of the nitrogen gas is observed as 80.7 kPa.

The term partial pressure has to do with the pressure of a particular gas that is a component of a mixture of gases. Now we have from the question that the pressure of the gas has been observed as 99.4 kPa

The next thing that we must do is to find the vapor pressure of water at that temperature as this could help us to be able to get the partial pressure of the nitrogen at that temperature.

We can now see that the partial pressure of the nitrogen gas is; 99.4 kPa -18.7 kPa = 80.7 kPa

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Answer:

Limewater is a solution of calcium hydroxide. If carbon dioxide is bubbled through limewater, the limewater turns milky or cloudy white.

The structure in the figure where an electron transport chain is located is the inner mitochondrial membrane.

The main function of the processes that occur in the inner mitochondrial membrane, specifically in the electron transport chain, is to generate ATP through oxidative phosphorylation.

The electron transport chain is a series of protein complexes embedded in the inner mitochondrial membrane. It plays a crucial role in the final stage of cellular respiration, which is the process by which cells extract energy from nutrients.

During oxidative phosphorylation, electrons are transferred through the electron transport chain from energy-rich molecules such as NADH and FADH2.

As electrons pass through the protein complexes, their energy is gradually released, and protons (H+) are pumped across the inner mitochondrial membrane from the mitochondrial matrix to the intermembrane space. This creates an electrochemical gradient.

The main function of this electron transport and proton pumping is to establish a proton motive force.

The gradient created by the electron transport chain drives the ATP synthase enzyme, located in the inner mitochondrial membrane, to produce ATP from ADP and inorganic phosphate. This process is known as chemiosmosis.

Overall, the electron transport chain in the inner mitochondrial membrane plays a crucial role in generating ATP, the energy currency of the cell, by utilizing the energy stored in the electrons derived from the breakdown of nutrients.

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Answer:

M(AgNO3) = 169,8731 g mol

Explanation:

M(Ag) = 107,8682 g mol

M(N) = 14.0067 g mol

M(O) = 15.9994 g mol

M(AgNO3) = M(Ag) + M(N) + 3 x M(O) = 107.8682 + 14.0067 + 3 x 15.9994 =

= 169,8731 g mol

Just sum up all the respective elements' molar mass.

Answer:0.1C

Explanation:

Answer: It is 1

Explanation: Got it correct on Acellus hope it helps!

Answer: There are 576.46 number of grams present in 16.95 mol hydrogen peroxide \((H_{2}O_{2})\).

Explanation:

Number of moles is defined as the mass of substance divided by its molar mass.

The molar mass of \(H_{2}O_{2}\) is 34.01 g/mol. Hence, mass of hydrogen peroxide present in 16.95 moles is calculated as follows.

\(Moles = \frac{mass}{molarmass}\\16.95 mol = \frac{mass}{34.01 g/mol}\\mass = 576.46 g\)

Thus, we can conclude that there are 576.46 number of grams present in 16.95 mol hydrogen peroxide \((H_{2}O_{2})\).

Answer: Astrology is an example of pseudoscience. It is based on beliefs and is not supported by any scientific evidence.

Answer: a

Explanation:

The highest entropy will be 0 mL of water at 100°C.

Entropy is just a measured physical quality that will be most usually linked with disorder, unpredictability, or uncertainty.

The quantity of random movement in a system increases as more energy is put into it. Entropy rises like a volume increases in a system.

Therefore, the correct answer will be option 1.

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To determine the [H3O+] concentration in each acid solution, we need to use the acid dissociation constant (Ka) equation. For strong acids, the [H3O+] concentration is equal to the acid concentration, but for weak acids, we need to take into account the equilibrium between the acid and its conjugate base.

Ka = [H3O+][A-]/[HA]
[H3O+] = sqrt(Ka*[HA])
If the acid is weak, then the value of [H3O+] is less than the acid concentration because only a small fraction of the acid molecules dissociate into H3O+ ions. The degree of dissociation depends on the Ka value, the acid concentration, and the ionic strength of the solution.
For example, if we have a 0.1 M solution of acetic acid with a Ka of 1.8x10^-5, then:
[H3O+] = sqrt(1.8x10^-5 * 0.1) = 1.34x10^-3 M
Since acetic acid is a weak acid, the [H3O+] concentration is less than the initial acid concentration of 0.1 M. This means that most of the acetic acid molecules remain undissociated in solution.
In summary, to determine the [H3O+] concentration in acid solutions, we need to use the Ka equation and consider the strength of the acid. If the acid is weak, then the [H3O+] concentration will be less than the acid concentration due to incomplete dissociation.

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Answer:

Ans no 1. As magnesium used to react with oxygen and due to the reaction the mass (weight) of magnesium increases , this reaction between oxygen and magnesium which form magnesium oxide in the air by forming white smoke increases the mass of magnesium

Answer:

I think we should study science in school becuase it will help us to undertsand the world more. Our knowledge as humans have progressed due to science research; at one time we didn't know how trees produce oxygen.

Explanation:

If you are unsure which layer is which in an extraction procedure, there are a few steps you can take to try and identify them.

One approach is to carefully observe the physical properties of each layer, such as color, viscosity, and density. For example, the aqueous layer is typically clear or pale yellow in color, while the organic layer may be darker and more viscous.
You can also perform a simple test to determine which layer is which. One common method is to add a small amount of water to the mixture and observe which layer the water separates into. Since water is more polar than many organic solution, it will typically dissolve in the aqueous layer and not in the organic layer.
If you are still unsure which layer is which, you may need to consult a reference or an expert in the field to help you identify them. In any case, it is important to take care when working with extraction procedures, as improper identification of layers can result in loss of product or inaccurate analysis.

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First nations people along the west coast of British Columbia used smelting technology to create copper plaques is false.

Smelting process is the form of extractive metallurgy to produce a metal from its ore. it is the process of melting and separation of charges .  it is extensive energy process. Plaques are made by pouring molten metal in to a mold. and when it gets cools , it solidified into a copper solid plaque. first nation people use copper as hunting weapons, spear tools etc. copper is metal.

Thus, First nations people along the west coast of British Columbia used smelting technology to create copper plaques is false.

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To prepare 10.0 ml of a 0.25% m/v HCl solution, you will need to mix 2.5 ml of 1% m/v HCl solution with 7.5 ml of distilled water.

To make 10.0 ml of a 0.25% m/v HCl solution from 1% m/v HCl, dilute the 1% m/v HCl solution by a factor of 4.

Here's how to figure out how much 1% m/v HCl and distilled water you'll need:

Determine the concentration of HCl in the final solution:

A 0.25% m/v HCl solution contains 0.25 grams of HCl per 100 mL. 

As a result, there will be 0.25 g/100 ml x 10 ml = 0.025 g of HCl in 10 ml of solution.

Determine the quantity of 1% m/v HCl required:

1% m/v HCl implies that there is one gram of HCl in every 100 ml of solution. You will need the following to make 0.025 g of HCl:

0.025 g/1 g x 100 ml = 2.5 ml of 1% m/v HCl solution

Determine the amount of distilled water required:

To prepare the remaining 7.5 ml of solution, use the following :

10 ml - 2.5 ml = 7.5 ml of distilled water

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Option A. 3Cu + 2AlCl3 --> 3CuCl2 + 2Al is correct.

The products of the reactants Cu + AlCl3 are 3CuCl2 and 2Al. This is a single replacement reaction, in which the copper metal is replaced by the aluminum ions in the aluminum chloride compound, forming copper chloride and aluminum metal.

In a chemical reaction, reactants are substances or elements that interact with or combine with another substance or element (the process of transformation of chemical substances). Typically, these are at the start of the arrows in chemical processes. To further grasp the word, let's look at an example of a chemical equation (a symbol for a chemical reaction).

Water is created when hydrogen and oxygen are combined.

The chemical makeup of water is shown in the aforementioned reaction. A chemical reaction's arrow denotes the direction in which the reaction takes place. This is how the equation would seem if we used the scientific names for its components.

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Answer:

Explanation:

I can help you

The shape of an electron cloud is primarily determined by the electron's energy sublevel, which is a function of its principal quantum number. Option A

Electrons occupy different energy sublevels within an atom's electronic configuration, and these sublevels have different shapes, orientations, and energies. The shapes of these sublevels are determined by the probability distribution of the electrons in that sublevel, which is a mathematical function that describes the likelihood of finding the electron at any given point in space.

The probability distribution is determined by the quantum mechanical properties of the electrons, which are described by their wave functions. The shapes of the energy sublevels are characterized by different types of orbitals, such as s, p, d, and f orbitals, each with a distinct shape and orientation.

The position and speed of the electron also play a role in determining its energy and behavior, but they do not directly determine the shape of the electron cloud. Option A

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The powdery substance that is often referred to as a sacred ingredient in baking is flour. Flour is a versatile ingredient that can be used in a wide range of baked goods.

Flour is made by milling the grains into a fine powder, which can then be used to make a variety of baked goods such as bread, cakes, and pastries. Flour is an essential ingredient in baking, as it provides the structure and texture to baked goods. The protein content of flour is important for determining the strength and elasticity of the dough. This is particularly important in bread-making, where the gluten proteins in the flour are essential for creating the structure of the bread.

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Answer:

the number of protons determines the atomic number

Explanation:

Ex. Aluminum has 13 protons, so it's atomic number is 13

hope this helps :)

Answer:

Explanation:

Decomposition reaction, also known as analysis or dissociation, is a type of chemical reaction in which a compound breaks down into simpler substances or elements. In this reaction, a single reactant undergoes a chemical change and produces two or more products.

The decomposition reaction can be represented by the general equation:

AB → A + B

Where AB is the reactant, and A and B are the products. The reactant AB is usually a compound, and it breaks down into its constituent elements or simpler compounds.

There are different types of decomposition reactions, including:

Thermal decomposition: It occurs when a compound is heated, resulting in its decomposition into simpler substances. For example, the thermal decomposition of calcium carbonate (CaCO3) produces calcium oxide (CaO) and carbon dioxide (CO2):

CaCO3 → CaO + CO2

Electrolytic decomposition: It takes place when an electric current is passed through an electrolyte, causing it to break down into its component ions. For instance, the electrolysis of water (H2O) leads to the decomposition into hydrogen gas (H2) and oxygen gas (O2):

2H2O → 2H2 + O2

Photochemical decomposition: It occurs when a compound undergoes decomposition due to exposure to light energy. Chlorine gas (Cl2) can decompose into chlorine atoms (Cl) under the influence of light:

Cl2 → 2Cl

These are just a few examples of decomposition reactions. They are important in various chemical processes and are used in industries, laboratory experiments, and natural phenomena. By understanding and controlling decomposition reactions, scientists can gain insights into the behavior of different compounds and develop practical applications in fields such as chemistry, materials science, and environmental science.

Answer:

Explanation:

reaction in which a compound breaks down into simpler substances or elements

Answer:

Silver (Ag)

Explanation:

The electronic configuration of copper is shown below;

[Kr]4d10 5s1

We can see that there is only one 5s1 electron. Hence Ag^+ tends to display a pseudo noble gas configuration. This pseudo noble gas configuration explains why silver is prevalent in the +1 oxidation state.

The other transition metals have many stable oxidation states found in nature. Chromium is observed both in +3 and +6 oxidation states. Iron is found in +2 and +3 oxidation states and copper is mostly stable in the +2 oxidation state since the +1 oxidation state readily disproportionate.

Hence silver tends to have only a single ionic charge for reasons aptly stated above.

The new volume of the balloon at the top of Pikes Peak is 4.1 L.

The ideal gas law can be used to solve this problem:

PV = nRT

We can assume that the amount of helium in the balloon remains constant throughout the process, so n and R are constant.

For the initial conditions:

P = 571.9 torr

V = 5.2 L

T = 31.9 + 273.15

  = 305.05 K

For the final conditions:

P = 400 torr

T = 6.6 + 273.15 = 279.75 K

Using the ideal gas law, we can solve for the new volume of the balloon:

(V1/T1) = (V2/T2) * (P1/P2)

Plugging in the values:

(5.2 L/305.05 K) = V2/279.75 K * (571.9 torr/400 torr)

Solving for V2:

V2 = (5.2 L/305.05 K) * 279.75 K * (400 torr/571.9 torr) = 4.1 L

As a result, the balloon's new volume at the summit of Pikes Peak is 4.1 L.

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