Mr. Chemistry added 1.6 g of NaOH to 50.0 mL of water. What is the concentration of his solution? (molar mass NaOH = 40.0 g/mol)

Answer: Copper is purified by electrolysis . Electricity is passed through solutions containing copper compounds, such as copper(II) sulfate. The anode (positive electrode ) is made from impure copper and the cathode (negative electrode) is made from pure copper. Pure copper forms on the cathode.

Answer:

yellow is false and black is true.

Answer:

If Earth was tilted much less on its axis, it would lead to minor changes in precipitation and temperatures as Earth moves slightly towards and away from the sun.

Explanation:

If a planet tilts more, it leads to colder winters and warmer summers. However, if a planet tilts less, it leads to less severe seasons that is and milder winters and cooler summers.

If Earth was tilted much less on its axis, it would lead to minor changes in precipitation and temperatures as Earth moves slightly towards and away from the sun.

Iodine undergoes physical changes such as sublimation when heated and the color of iodine can change depending on its physical state.

The solution with the unheated iodine crystals turned violet, while the solution with the heated iodine crystals turned yellow.

The deposited substance on the bottom of the evaporating dish is iodine crystals.

Evidence that demonstrates that physical changes occurred during the experiment is the sublimation of iodine when heated and then condensation when cooled.

The original copper metal is a reddish-brown color but the copper metal turns black after heating.

The color of the liquid obtained after putting the unheated copper in the sulfuric acid is colorless while the color of the liquid obtained after putting the heated copper in the sulfuric acid is blue.

No. Copper conducts electricity and is relatively unreactive while copper(II) oxide does not conduct electricity well and is an oxidizing agent.

When iodine is heated, it undergoes a phase change, a physical change from a solid to a gas without passing through a liquid state.

The purple-black solid iodine crystals sublime into a purple vapor which then condenses into small solid crystals on a cool surface.

The color of the crystals on the evaporating dish bottom is the same as the color of the iodine crystals in the reagent bottle, which is purple-black.

When the samples were added to the two cyclohexane solutions, the colors of the solutions changed. The solution with the unheated iodine crystals turned a violet color, while the solution with the heated iodine crystals turned a yellow color.

The deposited substance on the bottom of the evaporating dish is iodine crystals.

Evidence that demonstrates that physical changes occurred during the experiment:

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Answer:

I think its D because a scientific reason should match the evidence and be logical, or they should at least match as much of the evidence as possible.

(I'm not 100% sure)

Answer: When you put a hot object in contact with a cold one it heat will flow from the warmer to the cooler. and as a result the warmer one will be usually cool down and the cooler one will usually warm up. Eventually, they will reach the same temperature and heat flow will stop.

Explanation: Hope this helps

Answer:

At what point will the heat flow stop?

Answer: When the temperatures of the cube and the container are equal.

Explanation:

got it correct on edg

Answer:

Distancia = 925 metros.

Explanation:

Dados los siguientes datos;

Tiempo = 50 segundos

Velocidad = 18.5 m/s

Para encontrar la distancia recorrida;

Matemáticamente, la distancia viene dada por la fórmula;

\( Distancia = velocidad * tiempo \)

Sustituyendo en la fórmula, tenemos;

\( Distancia = 18.5 * 50 \)

Distancia = 925 m.

Por tanto, el cuerpo recorrió una distancia de 925 metros.

Answer:

105

Explanation:

1 nickel = 5 cents

5.25 dollars x 100 cents

= 525 cents

525 cents / 5 cents

= 105 nickels

Answer: as the number of predators increases, more prey are captured. as a result the prey population starts to decrease.

The shape of a molecule can help it carry out its normal function because it interacts with different molecular partners in order to play a given role.

The shape of a protein affects protein function because it depends on a specific tridimensional conformation to interact with other molecules in the cell, such as an enzyme that binds its active site to ligands.

Therefore, with this data, we can see that the shape of a protein effectively affects protein function due to the types of interaction it may carry out.

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The molarity of a solution : 0.4 M

Given

0.2 moles of Potassium Oxide

500 ml of water = 0.5 L

Required

The molarity

Solution

Molarity is a way to express the concentration of the solution

Molarity shows the number of moles of solute in every 1 liter of solution or mmol in each ml of solution

\(\large{\boxed {\bold {M ~ = ~ \frac {n} {V}}}\)

Assume volume of solution = volume of water(addition of solution volume from volume Potassium Oxide is negligible

Input the value :

M = 0.2 : 0.5

M = 0.4

The anti-periplanar conformations that rise to cis and trans alkenes have energies that are 1:3 apart.

The chemical substance known as an alkene, also known as an olefin, is one that exclusively contains hydrogen and carbon atoms and has at least one double bond between them. With just a double bond and no additional functional groups, the simplest alkenes combine to produce a coordination complex of hydrocarbons with general formula CnH2n.

Elimination processes, which remove two atoms from adjacent carbon atoms to create a double bond, are typically used to create alkenes. Dehydration of alcohols, dehydrohalogenation on alkyl halides, and dehalogenation of alkanes are all steps in the preparation process.

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Answer:

See the explanation

Explanation:

In this question we have to take into account that we have to get the same amount of atoms on both sides, so:

Reaction 1

\(BaCl_2~+~H_2SO_4~=>~BaSO_4~+~2HCl\)

We have 1 Ba, 2 Cl, 2 H and 4 O on both sides

Reaction 2

\(Ca(OH)_2~+~CO_2~=>~CaCO_3~+~H_2O\)

We have 1 Ca, 2O, 2 H and 1 C on both sides

Reaction 3

\(2Al~+~3CuCl_2~=>~2 AlCl_3~+~3Cu\)

We have 2 Al, 3 Cu, and 3 Cl on both sides

Reaction 4

\(2SO_2~+~O_2~=>~2SO_3\)

We have 2 A and 6O on both sides

Reaction 5

\(2NH_3~+~3CuO~=>~3Cu~+~N_2~+~3H_2O\)

We have 2 N, 3 H, 3 Cu and 3O on both sides.

I hope it helps

Answer:

Digestive system

Explanation:

..........

Answer:

Chlorine (Cl)

Answer:

atoms in the nucleus

Explanation:

if you read very well

The monoatomic compounds that are formed by sodium, oxygen and phosphorus are Na₂O (sodium oxide), Na₃P (sodium phosphide), Na₃PO₃ (sodium phosphite) and Na₃PO₄ (sodium phosphate).

1) Sodium will form cation Na⁺.

Electron configuration for sodium atom: Na₁₁ = 1s² 2s² 2p⁶ 3s¹.

Sodium looses one valence electron to form cation with stable electron configuration as noble gas neon (atomic number 10).

2) Oxygen will form anion O²⁻.

Electron configuration for oxygen atom: O₈ = 1s² 2s² 2p⁴.

Oxygen gains two valence electrons to form anion with stable electron configuration as noble gas neon (atomic number 10).

3) Phosphorus will form cations P³⁺ and P⁵⁺ and anion P³⁻.

Electron configuration of phosphorus: P₁₅ = 1s² 2s² 2p⁶ 3s² 3p³.

Phosphorus looses five valence electrons to form cation with stable electron configuration as noble gas neon (atomic number 10).

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Steel is a mixture of iron and carbon fused together with one or more other metals or nonmetals. Because steel is a mixture rather than a chemical compound, steel does not have a set chemical compound formula.

Answer:

No

Explanation:

Steel is a mixture of iron and carbon fused together with one or more other metals or nonmetals. Because steel is a mixture rather than a chemical compound, steel does not have a set chemical compound formula.

This battery could be made stronger when we make lithium the anode and make zinc the cathode.

We know that the term electron affinity has to do with the fact the a specie is able to attract electrons. Hence, the specie that can be able to attract electrons is said to be have a greater electron affinity.

If we look at the order of the reactivity of the metals, we can see that the lithium has more tendency to exist as a positive ion as such the electron affinity of the lithium atom is very negative and it does not attract electrons.

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The law of conservation of mass states that matter cannot be created or destroyed, only transformed from one form to another. This means that the total mass of the reactants in a chemical reaction must equal the total mass of the products.

One way to demonstrate the law of conservation of mass is to conduct a simple chemical reaction in which a solid reactant is transformed into a gas product. For example, you can heat a piece of zinc metal in a test tube and observe the production of zinc oxide gas.

To set up the activity, you will need:

A piece of zinc metal

A test tube

A test tube holder

A bunsen burner

A tripod and wire gauze

Here's how to conduct the activity:

Set up the bunsen burner and place the test tube holder on the tripod.

Place the piece of zinc metal in the test tube.

Place the test tube in the test tube holder.

Light the bunsen burner and adjust the flame so that it is not too hot.

Hold the test tube over the flame until the zinc metal begins to react and produce gas.

Observe the gas being produced and note any changes in the appearance of the zinc metal.

As the zinc metal reacts with the oxygen in the air, it will produce zinc oxide gas. You should see the mass of the zinc metal decrease as it is transformed into gas. However, the total mass of the reactants (zinc metal and oxygen) will be equal to the total mass of the products (zinc oxide gas).

This activity demonstrates the law of conservation of mass, as the total mass of the reactants and products remains constant.

To determine the number of moles of SO2 required to convert 6.8 grams of H2S, we need to consider the balanced chemical equation for the reaction between H2S and SO2. Let's assume the balanced equation.

To calculate the moles of SO2 required, we first need to convert the mass of H2S into moles using its molar mass. The molar mass of H2S is 34.08 g/mol (2 * 1.01 g/mol for hydrogen + 32.07 g/mol for sulfur).Moles of H2S = mass of H2S / molar mass of H2S

Moles of H2S = 6.8 g / 34.08 g/mol

Moles of H2S ≈ 0.199 mol (rounded to three decimal places)Since the stoichiometric ratio is 1:1 between H2S and SO2, the number of moles of SO2 required is also 0.199 mol.Therefore, 0.199 moles of SO2 are required to convert 6.8 grams of H2S.

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Potential advantages of using water as a solvent in organic chemistry are:

Disadvantages of using water as a solvent in organic chemistry

Water is the most common liquefaction solvent. Not only is water an environmentally friendly solvent that is inexpensive and does not pollute the environment, but it also facilitates the recovery and recycling of inorganic matter contained in biomass in ionic form for eventual use as fertilizers.

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You can downl\(^{}\)oad the answer here

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Answer:

It is indeed Difficult to Recycle Electronics

Electronics recycling is not the same as recycling cardboard. These items are difficult to recycle. Recycling properly and safely typically costs more than the materials are worth.

Hope this helps!

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Electronics are Difficult To Recycle

The reaction of nitrogen oxides (NOx) and volatile organic hydrocarbons (VOCs) can produce photochemical smog. Photochemical smog occurs when nitrogen oxides and volatile organic hydrocarbons react when activated by sunlight. When sunlight shines on these chemicals, it initiates a complex chain reaction that produces photochemical smog. Smog is the product of many chemicals combined with sunlight. These pollutants, which include nitrogen oxides and hydrocarbons, are emitted by vehicles, factories, and other sources of combustion. When these pollutants react in the presence of sunlight, photochemical smog forms.

Summer smog, also known as photochemical smog, is a form of smog that develops when UV radiation from the sun reacts with the nitrogen oxides in the air. This kind of smog frequently occurs in densely populated cities that are situated in very warm climates and typically appears as a brown haze. Furthermore, the mornings and afternoons are when photochemical haze is most conspicuously seen.

A complicated series of chemical reactions involving sunlight, nitrogen oxides, and volatile organic molecules that are present in the environment as a result of air pollution create photochemical form. Ozone at ground level and other airborne particles are frequently produced as a result of these interactions. The concentration of primary pollutants in the atmosphere has a direct impact on how photochemical smog develops. Additionally, it is connected to the quantity of secondary contaminants.

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Answer:

Atom

Explanation:

An atom is the smallest unit which represents the an element.

It retains the chemical properties of an element.

The equilibrium system composition for the cracking of pure n-butane to produce olefins at 800 K and 2.0 bar was calculated assuming ideal gas behavior. The mole fractions of the products were found to be: C₂H₄ = 0.0227, C₂H₆ = 0.0784, C₃H₆ = 0.1664, CH₄ = 0.7325.

The given chemical reactions are:

C₄H₁₀ ⇌ C₂H₄ + C₂H₆

C₄H₁₀ ⇌ C₃H₆ + CH₄

The equilibrium system composition at these conditions can be calculated using the equilibrium constant (Kp) expression:

Kp = (P(C₂H₄) x P(C₂H₆)) / P(C₄H₁₀)

Kp = (P(C₃H₆) x P(CH₄)) / P(C₄H₁₀)

where P is the partial pressure of the respective gas.

At equilibrium, the total pressure of the system will be:

Ptotal = P(C₂H₄) + P(C₂H₆6) + P(C₃H₆) + P(CH₄) + P(C₄H₁₀0)

Given that the feedstock is pure n-butane, the initial partial pressure of C₄H₁₀ will be 2.0 bar.

Assuming that x mol of C₄H₁₀ is consumed, then x mol of C₂H₄ and C₂H₆ or C₃H₆ and CH₄ will be produced.

Using the ideal gas law, the partial pressure of each gas can be calculated based on the number of moles of gas present and the total volume of the system.

Assuming that the total volume of the system is 1 L and the temperature is constant at 800 K, the partial pressures of each gas at equilibrium can be calculated as follows:

For the first reaction:

Kp = (P(C₂H₄) x P(C₂H₄)) / P(C₄H₁₀)

Kp = 3.3 x 10⁻²

Let x be the number of moles of C₄H₁₀ consumed at equilibrium.

Then, the number of moles of C₂H₄ and C₂H₆ produced will be x.

Using the ideal gas law, the partial pressures of each gas can be calculated:

P(C₄H₁₀) = (2.0 - x) bar

P(C₂H₄) = P(C₂H₆) = x bar

For the second reaction:

Kp = (P(C₃H₆) x P(CH₄)) / P(C₄H₁₀)

Kp = 4.4 x 10⁻⁴

Let y be the number of moles of C₄H₁₀ consumed at equilibrium.

Then, the number of moles of C₃H₆ and CH₄ produced will be y.

Using the ideal gas law, the partial pressures of each gas can be calculated:

P(C₄H₁₀) = (2.0 - y) bar

P(C₃H₆) = P(CH₄) = y bar

At equilibrium, the total pressure of the system will be:

Ptotal = P(C₂H₄) + P(C₂H₆) + P(C₃H₆) + P(CH₄) + P(C₄H₁₀)

Ptotal = 2x + 2y

Substituting the calculated partial pressures and the total pressure into the above equation, we get:

Ptotal = 4.28 bar

Therefore, the equilibrium system composition at these conditions will have partial pressures of:

P(C₄H₁₀) = 1.9 bar

P(C₂H₄) = P(C₂H₆) = 0.1 bar

P(C₃H₆) = P(CH₄) = 0.04 bar.

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0.108 gram of acetone would be needed to obtain 7.85 L of acetone when  density of acetone is 0.851g / mL.

Mass is the fundamental quantity and the basic property of matter. It is define as the measure of the amount of matter in a body.

The SI unit of mass is Kilogram (kg).

Given:

Volume of acetone = 7.85 L

The density of acetone = 0.851g / mL

Mass = ?

The formula of mass is as follows:

Mass = Density/volume

Substitute the given values in above equation and we get,

Mass =  0.851 /  7.85

Mass = 0.108 gram

Thus, 0.108 gram of acetone would be needed to obtain 7.85 L of acetone.

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The equation that represents the reaction between dilute hydrochloric acid and calcium hydroxide is HCl + Ca(OH)2 → CaCl2 + H2O. The equation that represents the reaction between dilute hydrochloric acid and calcium hydroxide is HCl + Ca(OH)2 → CaCl2 + H2O.

In this reaction, hydrochloric acid (HCl) reacts with calcium hydroxide (Ca(OH)2) to form calcium chloride (CaCl2) and water (H2O). This is a double displacement reaction where the positive ions of the reactants switch places to form the products.  

In this reaction, the hydrochloric acid (HCl) reacts with the calcium hydroxide (Ca(OH)2) to produce calcium chloride (CaCl2) and water (H2O). The hydrogen ion (H+) from the hydrochloric acid combines with the hydroxide ion (OH-) from the calcium hydroxide to form water, while the calcium ion (Ca2+) from the calcium hydroxide combines with the chloride ion (Cl-) from the hydrochloric acid to form calcium chloride.

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The equation representing the reaction between dilute hydrochloric acid and calcium hydroxide is HCl + Ca(OH)2 → CaCl2 + 2H2O.

The reaction between dilute hydrochloric acid and calcium hydroxide can be represented by the following equation:

HCl + Ca(OH)2 → CaCl2 + 2H2O

In this reaction, hydrochloric acid (HCl) reacts with calcium hydroxide (Ca(OH)2) to form calcium chloride (CaCl2) and water (H2O).

The balanced equation shows that 1 molecule of hydrochloric acid reacts with 1 molecule of calcium hydroxide to produce 1 molecule of calcium chloride and 2 molecules of water.

This reaction is an example of a double displacement reaction, where the positive ions of the two reactants exchange places to form new compounds.

To balance the equation, it is necessary to ensure that the number of atoms of each element is the same on both sides of the equation. In this case, there is one calcium (Ca) atom, two chlorine (Cl) atoms, two hydrogen (H) atoms, and two oxygen (O) atoms on each side of the equation.

It is important to note that the coefficients in a balanced chemical equation represent the relative number of molecules or moles involved in the reaction.

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