separating methods
1. water, oil and milk
2. blood
3. a mixture of iron pellets, sand, dirt and rocks
-why are you using that method
-what are you separating with that method

15.90 g mass of oxygen gas is consumed by the reaction of of ammonia. when Ammonia chemically reacts with oxygen gas to produce nitric oxide and water.

The mole is the fundamental unit of measurement in SI units for the amount of substance. It is defined as the mass of substance containing in the same number of particles found in 12.000 g of carbon atom (12C).

The molar mass is defined as the sum of masses of the atoms or molecules expressed in grams, and it is contributed by one mole of an atom or molecule.

The significant figures of a number are digits that carry meaning contributing to their measurement resolutions. The number of significant figures indicates the precision of a measurement instead of its magnitude. There are certain rules to determine significant digit.

The number of moles is calculated by the formula as follows:

Number of moles = given mass(g/molar mass(g/mol)

Step: 1

The reaction is as follows:

4NH3+5O2⟶4NO+6H2O

Here, the reactants are ammonia and oxygen and the product formed include nitric oxide and water. More precisely we can say that, 4 moles of ammonia react with 5 moles of oxygen to give 4 moles of nitric oxide and 6 moles of water.

Hint:

Find the mass of oxygen gas.

Step: 2

Consider the reaction as follows

4NH3+5O2⟶4NO+6H2O

Weight of 4 moles of ammonia = 4×17

=68g

Weight of 5 moles of oxygen = 5×32

=160g

Here

4 moles of ammonia ≡ 5 moles of oxygen

Therefore:

68 g of ammonia ≡ 10 g of oxygen

Therefore,

The mass of oxygen corresponding to 6.76 g of ammonia is calculated as follows:

mass of oxygen = 6.6g×160g / 68g

=15.90 g

Initially, the chemical reaction is considered. From that, it is clear that

4 moles of ammonia ≡ 5 moles of oxygen

Therefore,

68 g of ammonia ≡ 160 g of oxygen

Then, the mass of oxygen corresponding to 6.76g of ammonia is calculated by multiplying 6.76g with 160 g of oxygen and divided by the answer with 68 g. The mass of oxygen corresponding to 6.76g of ammonia is 15.90 g

The mass of oxygen corresponding to 6.76 g of ammonia is 15.90 g.

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The correct term for the removal of a chemical substance as an initial step in the treatment of a chemically dependent individual is a. detoxification.

Detoxification, often referred to as detox, is a process aimed at eliminating or reducing the presence of drugs or alcohol in the body. It is typically the first step in treating substance abuse and addiction. Detoxification can be performed in various settings, such as hospitals or specialized detoxification centers, and may involve medical supervision and support to manage withdrawal symptoms and ensure the safety and comfort of the individual during the process.

Detoxification is an essential component of the treatment process for individuals with substance abuse or addiction issues. It involves the removal or reduction of the addictive substance from the body. Substance abuse can lead to physical and psychological dependence, and detoxification helps the individual safely manage the withdrawal symptoms that may arise when the substance is discontinued. Depending on the substance and the severity of addiction, detoxification may involve medical interventions, such as medication-assisted detox, to ease withdrawal symptoms and ensure the individual's well-being. Detoxification is typically followed by additional treatment modalities, such as behavioral therapy (option b), to address the underlying causes of addiction and promote long-term recovery. The other options provided, c) DTs (delirium tremens) and d) ECT (electroconvulsive therapy), are not directly related to the initial step of substance removal in the treatment of chemically dependent individuals.

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the total mass is 187g. The total mass of the reactant is always equal to total mass of the products.

explanation:

as per the given details, the reactant involved in the reaction are 37g of magnesium and 150g of sulfuric acid . the total of the reactant is 187g.

Answer is: the current solution is unsaturated.

Unsaturated solution means that more of a substance can be dissolve.

For example:

Solubility of potassium chlorate (KClO₃) at 100 grams of water at 80°C is 37.5 g, that means that all 37.5 g is completely dissolves, this is the saturated solution.

If we add 20 grams of potassium chlorate in 100 grams of water, there is less solute than the saturated solution, so this is unsaturated solution.

Unsaturated solution is a solution in which more of the solute can be dissolved at a given temperature.

What is unsaturated solution with example?

Unsaturated solutions are any in which the concentration of the solute is less than the solute's saturation point. Two tablespoons of salt dissolved in one litre of water serves as an illustration. Acetic acid is the solute and water is the solvent in vinegar, which is an unsaturated solution.

Hence Unsaturated solution is a correct answer.

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Answer:

A

Explanation:

The reason it is distillation is due to the fact that we can use distillation to heat the ocean water. As water has a lower boiling point than the salt solution, it evaporates and the salt stays behind.

The succession of communities occurs because most populations have a limited lifespan and die, making room for others.

Succession refers to the process of changes in the composition and structure of ecological communities over time. It occurs due to various factors, but one of the main drivers is the limited lifespan of populations within a community. Populations of organisms are not immortal, and individuals eventually die, creating opportunities for new individuals or species to colonize the area.

As populations age and die, they leave behind resources and open spaces that can be utilized by other organisms. These vacant ecological niches allow for the establishment of new populations or species, leading to the succession of communities. Succession can also be influenced by climate changes, limited resources, and environmental disturbances.

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Answer:

1 mole of Helium is answer

The element having that electronic configuration is Cobalt.

Its an element in d - block, having atomic number 27

Answer:

Solar energy causes evaporation; uneven heating of the Earth causes air masses to move; Coriolis forces help storms to take shape; and gravity makes rivers flow downhill. Another relevant factor is the high heat capacity (or specific heat) of water.

Explanation:

hoped this helped;)

Answer:

We use aluminum almost every day, aluminum can be used for juice boxes, chip bags, cans, foils, electronics, and even our cars have aluminum.

Explanation:

Answer:

Fractional distillation

Explanation:

Petrol and diesel can be separated by using a process referred to as distillation.

While separating petrol and diesel using distillation, the mixture is kept in a fractionating column.

The one with the lowest boiling point evaporates first and goes to the higher level followed by condensation at lower temperature, while the one with higher boiling point has high condensation point, but condenses at a lower level.

And that is how to separate them, in a process more specifically referred to as " fractional distillation "

Hope that helps!

The substance in the image above would be classified as a mixture of elements (option E).

A compound is a substance formed by chemical bonding of two or more elements in definite proportions by weight.

On the other hand, a mixture is made when two or more substances are combined, but they are not combined chemically.

According to this question, an image is shown with two different substances or elements as distinguished by coloration (white and purple). These elements are combined but not chemically bonded, hence, is a mixture.

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Answer:

The answer is A

Explanation:

Trial and error :P

Answer: The answer is B. Energy and matter can enter and leave.

Explanation:

Answer:

Explanation:

 When calcium carbonate is heated the new substances formed will be Calcium oxide and carbon dioxide

(a)

\(CaCO3 + heat\)→\(CaO+ CO2\)

\(Calcium carbonate + heat\)→\(Calcium oxide +Carbon dioxide\)

(b)

Elements are pure substances made up of the same atoms such as Ca, C, etc.

Compound are formed when two or more different types of elements are bonded together. like Calcium carbonate in this case

hence, \(CaCO3\) is a compound

Answer:  C) tert-Butyl phenyl ether

Explanation:

n Williamson ether synthesis, an alcohol is treated with an alkyl halide in presence of a strong base such as sodium hydride (NaH), to form an ether. Initially, an alkoxide ion is formed by the reaction of the alcohol with sodium hydride (NaH). The alkoxide ion then acts as a nucleophile and attacks alkyl halide to form an ether. The reaction is represented as follows:

\text{ROH}\xrightarrow{\text{NaX}}\text{R}{{\text{O}}^{-}}\text{ N}{{\text{a}}^{+}}\xrightarrow{\text{R }\!\!'\!\!\text{ }-\text{X}}\text{R}-\text{O}-\text{R }\!\!'\!\!\text{ }

The R’-X used in the given reaction is generally a primary alkyl halide, which suggests that one of the hydrocarbon chains in the product ether will be a primary alkyl group. In the given ether, the two alkyl groups are the isopropyl group and the methyl group. The methyl group is a primary alkyl group, which suggests that the given ether can be prepared by Williamson ether synthesis. As a result, option A is incorrect.

In the given ether, the two alkyl groups are the tert-Butyl group and the methyl group. The methyl group is a primary alkyl group, which suggests that the given ether can be prepared by Williamson ether synthesis. As a result, option B is incorrect.

In the given ether, one is tert-Butyl group and the other is phenyl group. None of the two hydrocarbon groups is a primary alkyl group, which suggests that the given ether can not be prepared by Williamson ether synthesis. As a result, option C is the correct choice.

In the given ether, one is methyl group and the other is phenyl group. The methyl group is a primary alkyl group, which suggests that the given ether can be prepared by Williamson ether synthesis. As a result, option D is incorrect.

(1.632) (4.0 x 104)

= (1.632)(416)

=678.912

6.8* 10^2.

Not sure if it's the right sig figs.

Answer:

417.632 (i dont know if u need to round or somehting but this is what i think is right)

Explanation:

4.0 x 104 = 416

(1.632) (416) = 417.632

The simplest whole number ratio of percentage of elements will be same according to law of multiple proportions.

Compound -1

ratio:-

\(\\ \sf\longmapsto \dfrac{57.1}{42.9}=1.33\)

Compound-2

ratio

\(\\ \sf\longmapsto \dfrac{72.7}{27.3}=2.66\)

Now compound ratio:-

\(\\ \sf\longmapsto \dfrac{2.66}{1.33}=2\)

Hence verified

The two atoms appear to be oxygen (O) and chlorine (Cl). Because oxygen has six valence electrons and chlorine has seven, the two atoms would form a covalent bond.

What does Covalent bond mean?

A covalent bond is a type of chemical bond that involves the sharing of electrons between two atoms. This type of bond forms when the atoms in a molecule have similar electronegativity, meaning that they both have a similar affinity for electrons. Covalent bonds are typically stronger than other types of bonds and are found in molecules such as water and DNA.

What does DNA means?

DNA is an organic molecule that contains the genetic instructions for the development, functioning, growth, and reproduction of all known living organisms and many viruses. The DNA sequence contains the instructions required to build proteins, which serve as the foundation of cells and organisms. The DNA sequence is unique to each individual and is passed down from generation to generation.

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Heat is transferred through convection by the movement of a liquid or gas and is denoted as option D.

this is defined as the process of heat flow through a fluid which include a liquid or gas.

This process doesn't involve contact between the object unlike in conduction. A typical example is the heat flow which occurs in the atmosphere thereby making it the most appropriate choice.

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The value of Δrxn for nitrous acid when [NO−2]=[H3O+]=3.18×10−5 M and [HNO2]=1.457 M is -214.96 kJ/mol.

Given:

HNO2(aq) + H2O(l) ⇌ H3O+(aq) + NO−2(aq)

Ka = 5.6 x 10^-4 M

Δ∘rxn at 25.0 ∘C for nitrous acid is to be calculated when [NO−2]=[H3O+]=[HNO2]=1.00 M.

Using the Ka expression:

Ka = [H3O+][NO−2] / [HNO2]

5.6 x 10^-4 = [1.00]^2 / [1.00]

Therefore,

[H3O+] = [NO−2] = 0.02365 M

To calculate Δ∘rxn:

Δ∘rxn = -2.303RT log Ka

At 25°C, R = 8.314 J/mol K and T = 298 K.

Δ∘rxn = -2.303 x 8.314 x 298 x log (5.6 x 10^-4) kJ/mol

= -21.1 kJ/mol

The value of Δ∘rxn is -21.1 kJ/mol.

Since Δ∘rxn is negative, the acid will spontaneously dissociate under these conditions because the reaction is exothermic and Δ∘rxn is negative, indicating that the reaction is spontaneous.

Now, let's calculate the value of Δrxn for nitrous acid when [NO−2]=[H3O+]=3.18×10−5 M and [HNO2]=1.457 M.

Using the formula:

Δrxn = ΔfH°(H3O+(aq)) + ΔfH°(NO2−(aq)) - ΔfH°(HNO2(aq))

Given values:

ΔfH°(HNO2(aq)) = -56.06 kJ/mol

ΔfH°(H3O+(aq)) = -237.13 kJ/mol

ΔfH°(NO2−(aq)) = 33.89 kJ/mol

Δrxn = -237.13 + 33.89 - (-56.06) kJ/mol

= -214.96 kJ/mol

Therefore, the value of Δrxn for nitrous acid when [NO−2]=[H3O+]=3.18×10−5 M and [HNO2]=1.457 M is -214.96 kJ/mol.

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It is not possible for two electrons to have the same set of all four quantum numbers in an atom, as it would violate the Pauli exclusion principle.

According to the Pauli exclusion principle, no two electrons in an atom can have the same set of all four quantum numbers. The four quantum numbers used to describe an electron's state are the principal quantum number (n), the azimuthal quantum number (l), the magnetic quantum number (m), and the spin quantum number (s).

The principal quantum number (n) determines the energy level of an electron and can have integer values starting from 1. The azimuthal quantum number (l) determines the shape of the electron's orbital and can have values from 0 to (n-1). The magnetic quantum number (m) determines the orientation of the orbital and can range from -l to +l. The spin quantum number (s) describes the spin of the electron and can have two possible values, +1/2 or -1/2.

Since each electron in an atom must occupy a unique set of quantum numbers, they must differ in at least one of the four quantum numbers. This ensures that no two electrons have the exact same quantum state.

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[ Diagram - refer to attachment ]

The scientific method is a systematic process of testing hypotheses to determine if they are correct or incorrect.

According to the scientific method, the process of testing hypotheses is an essential component of scientific inquiry. Scientists develop hypotheses as educated guesses or predictions about what they believe will happen in a given situation. After conducting experiments, analyzing data, and drawing conclusions, scientists revisit their hypotheses to determine if they were correct or incorrect.

When revisiting their hypotheses, scientists are assessing whether their conclusion proves or disproves their original hypothesis. A hypothesis can be considered correct if the data collected during the experiment supports it. On the other hand, if the data collected during the experiment does not support the hypothesis, it is considered incorrect.

An example of this process can be seen in a study aimed at examining whether caffeine consumption affects the quality of sleep in adults. The hypothesis could be that caffeine consumption reduces the quality of sleep. After conducting experiments and analyzing data, the conclusion may indicate that caffeine consumption does not impact the quality of sleep in adults. In this case, the conclusion disproves the original hypothesis.

In conclusion, the scientific method is a systematic process of testing hypotheses to determine if they are correct or incorrect. The conclusion reached after conducting experiments and analyzing data provides evidence for whether the hypothesis was proven or disproven.

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Answer: I think they get will paralysed and some of the impulses may not be able to get through.