CAN SOMEONE PLEASE HELP ME ASAP PLEASEE ANYBODY LITERALLY ANYONE OUT THERE PLEASE

It is the number of protons that determine

determine what?

When iron-rich materials cool below their Curie temperature, they may preserve the orientation of the magnetic field.

The Curie temperature is the temperature at which a ferromagnetic material loses its magnetic properties. When a ferromagnetic material is heated to its Curie temperature, the thermal energy causes the magnetic moments of the atoms in the material to become disordered, which causes the material to lose its magnetic field. When the material cools below its Curie temperature, the magnetic moments of the atoms become ordered again, but the orientation of the magnetic field may not be preserved. However, in iron-rich materials, if the cooling process is slow enough, the orientation of the magnetic field can be preserved, creating a record of the Earth's magnetic field at the time the material cooled. This property has been used to study the Earth's magnetic field history by analyzing the magnetic properties of rocks and sediments.

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When diluting a strong acid with water, it is recommended to add the acid to the water and not the other way around. The statement is true.

This is because adding water to the acid can cause a rapid and exothermic reaction, leading to splattering and potential injury.

When the acid is added to the water, the heat generated is absorbed by the water, reducing the potential for splattering. Additionally, adding the acid to water allows for better mixing and reduces the risk of creating concentrated acid pockets that can be dangerous.

Overall, it is important to follow safe laboratory practices when working with acids and to consult with a trained professional if you are unsure about the proper procedures.

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Answer:

Helps to form hair, nails and your skin outer layer

Help to support your skin, heal wounds and keep your nails and hair healthy

Explanation:

if it's helpful let me know in the comments and messages .. please send me your phone number ..lets us be friends

Answer:

This 2.5061243 moles is in 4 liters.

In the titration of a 25.6 ml sample of a 0.397 m aqueous hydrofluoric acid solution with a 0.406 m aqueous potassium hydroxide solution, the pH at the equivalence point is 8.21.

Given volume of sample (V) = 25.6ml = 0.0256L

Concentration of  aqueous hydrofluoric acid solution (M1) = 0.397M

Concentration of  aqueous potassium hydroxide solution (M2) = 0.406M

The concentration of fluoride ions will determine the pH at the equivalency point. During the titration, the reaction is

HF + KOH --> H2O + KF.

Since it is the conjugate base of a weak acid, the F- will have an impact on the pH of the solution rather than the K+ in solution.

F- + H2O <--> HF + OH- is the reaction at the equivalence point, and the fluoride ion's molarity is 0.0256 x 0.397 = 0.010 moles of HF = moles of KOH at the equivalence point = 0.010/0.406 = 0.0246L of KOH

At the equivalence point, the F-'s molarity will be equal to =  0.010/(0.0256+0.0246) = 0.199M

Additionally, the Kb for F- is required, and its values are as follows:

Kw/Ka = 1.0 x 10-14 / (6.6 x 10-4) = 1.5 x 10-11

pOH = -log (1.8 x 10-6) = 5.79

pH = 14-5.79 = 8.21

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Answer:

It is a chemical change

Explanation:

Melting of wax is temporary and wax can settle again on cooling and turns into a solid. ... Hence it is a chemical change.

Answer:

physical

Explanation:

the wax is changing it's physical state by becoming a liquid, it isn't changing it's chemical makeup

Answer:

People with a nasal voice can sound as though they're speaking through a clogged-up or runny nose, which are both possible causes. Your speaking voice is created when air leaves your lungs and flows upward through your vocal cords and throat into your mouth. The resulting sound quality is called resonance. (i hope i helped ya )

Explanation:

To calculate the percent methyl yield, we need to divide the amount of product obtained by the amount of theoretical yield, then multiply by 100.

Theoretical yield = 102 mg

Actual yield = 87 mg

Percent yield = (Actual yield / Theoretical yield) * 100

Percent yield = (87 / 102) * 100 = 85.3

So the Methyl is : 85.3

Methyl is a hydrophobic alkyl functional group. Its name is derived from methane, a simple alkane compound. Methyl is methane which has lost a hydrogen atom, making it unstable and reactive. Its chemical formula is -CH₃. This group occurs frequently in many organic compounds.

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Titration is the correct answer.

What is titration?

Titration, commonly referred to as titrimetry, is a typical quantitative chemical analysis method used in laboratories to ascertain the unidentified quantity of an analyte (Mednick and Kirschner, 2010). Titration is frequently referred to as volumetric analysis because it relies heavily on volume measurements. To determine concentration, a solution of the analyte or titrant reacts with a known concentration and volume of the titrant. Titrations come in a variety of forms with various protocols and objectives. Redox and acid-base titrations are the two most typical types of qualitative titrations.

Acid-base titrations rely on the solution-based neutralisation of an acid and a base. The acid-base indicator changes colour to signal when the titration has reached its endpoint.

Titrations carried out in the gas phase are known as "gas phase titrations," and they are specifically used to identify reactive species through their reaction with an excess of a titrant gas. In one typical gas phase titration, nitrogen oxide and gaseous ozone are titrated in accordance with the reaction

The amount of analyte in the initial sample is determined by quantifying the remaining titrant and product after the reaction has finished (for example, using FT-IR).

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Solution of an unknown concentration that has another solution slowly added to it _____________.

Answer:

-1300

Explanation:

Answer:

-1300

Explanation:

trust

Answer:

light

Explanation:

I'm not sure to my answer but hope it helps if it is correct:)

Answer:

Cl² is dichlorine

Explanation:

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Answer: \(232.8\ K\)

Explanation:

Given

The volume of Nitrogen gas is \(V_1=3.5\times 10^{-2}\ m^3\)

Pressure is \(P_1=10^5\ Pa\)

Temperature \(T_1=291\ K\)

When the pressure and temperature changes i.e.

\(P_2=10^5\ Pa\)

\(V_2=2.8\times 10^{-2}\ m^3\)

Temperature is given by

\(\Rightarrow \dfrac{P_1V_1}{T_1}=\dfrac{P_2V_2}{T_2}\\\\\Rightarrow T_2=\dfrac{P_2V_2}{P_1V_1}\times T_1\)

Insert values

\(\Rightarrow T_2=\dfrac{2.8\times 10^{-2}\times 10^5}{3.5\times 10^{-2}\times 10^5}\times 291\\\\\Rightarrow T_2=291\times 0.8\\\Rightarrow T_2=232.8\ K\)

To solve for the enthalpy of formation of MgO (delta Hf of MgO), we need to use Hess's Law, which states that the enthalpy change of a reaction is independent of the pathway between the initial and final states.

First, let's write out the chemical equations for the reactions given:

Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g) ΔHrxn = -376.7 kJ/mol

MgO(s) + 2HCl(aq) → MgCl2(aq) + H2O(l) ΔHrxn = -86 kJ/mol

H2(g) + 1/2O2(g) → H2O(l) ΔHrxn = -285.8 kJ/mol

Notice that the second reaction is the desired reaction for which we want to determine the enthalpy of formation of MgO. We can use the first and third reactions to manipulate them into the desired reaction.

To do this, we'll reverse the third reaction and multiply it by 2, then add it to the first reaction to cancel out the H2 and produce MgO:

2H2(g) + O2(g) → 2H2O(l) ΔHrxn = 2(-285.8 kJ/mol) = -571.6 kJ/mol

Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g) ΔHrxn = -376.7 kJ/mol

Mg(s) + O2(g) + 2HCl(aq) → MgCl2(aq) + H2O(l) ΔHrxn = -376.7 kJ/mol - 571.6 kJ/mol = -948.3 kJ/mol

Now, we need to cancel out the HCl to get the desired reaction:

Mg(s) + O2(g) + 6HCl(aq) → MgCl2(aq) + 3H2O(l) ΔHrxn = -3(-86 kJ/mol) = 258 kJ/mol

Notice that we multiplied the second reaction by 3 to match the number of moles of HCl in the first reaction.

Finally, we need to solve for the enthalpy of formation of MgO:

Mg(s) + 1/2O2(g) → MgO(s) ΔHf of MgO = ΔHrxn / moles of MgO

ΔHf of MgO = 258 kJ/mol / (1 mol) = -258 kJ/mol

Therefore, the enthalpy of formation of MgO is -258 kJ/mol.

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To calculate the amount of benzophenone needed, we need to use the formula:

Amount (g) = Moles × Molar mass
First, we need to convert the given amount of benzophenone from millimoles (mmol) to moles. Since 1 mmol = 0.001 moles, 2 mmol would be 0.002 moles.
The molar mass of benzophenone is 182.22 g/mol.
Using the formula, we can now calculate the amount of benzophenone needed:
Amount (g) = 0.002 moles × 182.22 g/mol
Amount (g) = 0.36444 grams
Therefore, approximately 0.36444 grams of benzophenone is needed to make a solution of 2 mmol benzophenone in 1 ml of diethyl ether.

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Nitrogen is the most common gas in Earth's atmosphere primarily because of its stable molecular structure and abundance in Earth's crust. It makes up about 78% of the atmosphere and plays a crucial role in supporting life on Earth.

Nitrogen gas (N2) is abundant in the atmosphere due to several factors. Firstly, nitrogen is a relatively inert gas, meaning it does not readily react with other elements or compounds. This stability allows nitrogen to accumulate in the atmosphere over long periods of time. Additionally, nitrogen is a major component of organic matter and is recycled through various biological and geological processes, contributing to its abundance. Nitrogen-fixing bacteria in the soil and legume plants also convert atmospheric nitrogen into forms usable by other organisms.

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Due to how simple it is to convert this gas to a liquid, it is known as liquefied gas. LPG can be converted from a gas to a liquid by applying low pressure or refrigeration.

Liquefied petroleum gas (LPG) is a fuel used in a variety of home appliances for heating, cooking, and producing hot water. Due to how simple it is to convert this gas to a liquid, it is known as liquefied gas. LPG can be converted from a gas to a liquid by applying low pressure or refrigeration. LPG is originally used for gas burners, cooktops, and ovens because these equipment, together with heaters, fireplaces, and gas hot water systems, are common in homes. Gas-powered dryers are also available.

Examples of outdoor gas equipment include fire pits, pizza ovens, patio heaters, rooftop fireplaces, and BBQs. Propylene, butane, isobutan butylenes,e, and combinations of these gases make up the majority of LPG.

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Explanation:

When it comes to assigning oxidation number to elements, the following rules should be observed;

1. Oxidation number of a neutral compound is zero and is equal to the sum of the oxidation numbers of the element.

2. Oxidation number of hydrogen is +1 except in hydrides where it is -1. Oxidation number of oxygen is -2 except in peroxides where it is -1.

3. For some elements, their oxidation number is equal to their group number.

(a) CaO

Let the oxidation number of Ca be x

Using rules 1 and 2;

Oxygen = -2

x + (-2) = 0

x - 2 = 0  ; x = 2

(d) KMnO4

K belongs to group 1 hence has oxidation number of +1

O = -2

Let the oxidation number of Mn be x

+ 1   +  x   + 4(-2) = 0

1 + x -8 = 0

x = +7

(b) NaHSO4

Na belongs to group 1 hence has oxidation number of +1

O = -2

Hydrogen = +1

Let the oxidation number of S be x

+ 1   +  1  + x   + 4(-2) = 0

2 + x -8 = 0

x = +6

(e) NaH PO4

Na belongs to group 1 hence has oxidation number of +1

O = -2

Hydrogen = +1

Let the oxidation number of P be x

+ 1   +  1  + x   + 4(-2) = 0

2 + x -8 = 0

x = +6

Fe304

Let the oxidation number of Fe be x

Using rules 1 and 2;

Oxygen = -2

3x + 4(-2) = 0

3x - 8 = 0  ; x = 8/3

For Fe3O4, two Fe atoms have an oxidation state of +3 and one of +2

(f) NaBH4

Na belongs to group 1 hence has oxidation number of +1

Hydrogen = +1

Let the oxidation number of B be x

+ 1   + x   + 4(1) = 0

1 + x + 4 = 0

x = -5

A solution of iodine changes from brown to blue when starch is added to it. You are observing the disappearance of reactants over time. Therefore, the correct option is option B.

A homogenous mixture of more than one component is referred to as a solution. On a particle-by-particle basis, it is homogeneous. Most of the time, people picture it as a liquid that has dissolved solids, liquids, or gases in it. This is not totally accurate, though. Alloys are a good alternative that we may use.

Solute is the name for the part of a solution that dissolves in the solvent. The solute constitutes the solution's tinier component. For instance, iodine represents the solute in "tincture of iodine," an alcohol-based solution of iodine. A solution of iodine changes from brown to blue when starch is added to it. You are observing the disappearance of reactants over time.

Therefore, the correct option is option B.

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Answer:

It comes from the sun.

Answer:

Power = 1011.2 Watts

Explanation:

Given the following data;

Voltage = 128 Volts

Current = 7.9 Amperes

To find the power rating;

Mathematically, the power rating of an electrical device is given by the formula;

Power = current * voltage

Power = 128 * 7.9

Power = 1011.2 Watts

Answer:

Rust, iron oxide, is weak mechanically although its chemical bonds are strong.

Explanation:

Answer:

A chemical property is a characteristic of a substance that may be observed when it participates in a chemical reaction. Examples of chemical properties include flammability, toxicity, chemical stability, and heat of combustion

Reaction A starts as an orange solution in chemical equilibrium. If SCN- is added to the mixture,color of solution is clear even after removal , and if FeSCN²⁺ is added color is red as it is acidic.

Chemical equilibrium is defined as the condition which arises during the course of a reversible chemical reaction with no net change in amount of reactants and products.A reversible chemical reaction is the one wherein the products as soon as they are formed react together to produce back the reactants.

At equilibrium, the two opposing reactions which take place take place at equal rates and there is no net change in amount of the substances which are involved in the chemical reaction.At equilibrium, the reaction is considered to be complete . Conditions which are required for equilibrium are given by quantitative formulation.

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The main difference between practical work inside a laboratory and outside a laboratory is the level of control that the experimenter has over the environment.

By conducting experiments in a controlled laboratory setting, the researcher has the ability to regulate various atmospheric conditions, such as temperature and humidity, thereby crucially contributing to the precision of the findings. It can be challenging to achieve precise outcomes when conducting experiments in non-laboratory settings due to the limited control over the surroundings.

The presence of specialized equipment sets apart practical work conducted within a laboratory from those performed outside. There is typically a vast selection of specialized equipment readily accessible in a laboratory, which can prove highly beneficial when conducting experimental procedures.

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Taking into account the definition of molarity, the molarity of a solution prepared by dissolving 0.2 mol sucrose in enough water to make a 100 mL solution is 2 \(\frac{moles}{liter}\).

Molar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.

The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:

\(molarity=\frac{number of moles}{volume}\)

Molarity is expressed in units \(\frac{moles}{liter}\).

In this case, you have:

Replacing in the definition of molarity:

\(molarity=\frac{0.2 mole}{0.1 L}\)

Solving:

molarity= 2 \(\frac{moles}{liter}\)

Finally, the molarity of a solution prepared by dissolving 0.2 mol sucrose in enough water to make a 100 mL solution is 2 \(\frac{moles}{liter}\).

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Answer:       freezing

Explanation:

when the atoms or molecules in a solid or liquid are moving slower and closer together, it is called brrrrrrrrr freezinf

Answer:

faster because atoms move faster when heated . If the temperature of the salt is extremely hot, a thin layer of vapor will form on the surface, insulating the salt from the water.

Explanation: