Which statement defines the enthalpy of solution?
the total number of particles in a solution
the phase change from a solid to a liquid
o the difference in characteristics between reactants and products
the change in energy when one substance dissolves in another

This hypothesis can be further substantiated by having different concentrations of acid and the same mass of limestone.

Though the question is incomplete, we must try to answer it the much we can. Recall that a hypothesis is a tentative explanation for an observation which is subject to empirical verification.

We know that the rate of reaction depends on the concentration of the acid. This hypothesis can be further substantiated by having different concentrations of acid and the same mass of limestone.

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Answer:

The Sun and the planets were born from a cloud of gas and dust called the solar nebula 4.6 billion years ago. The collapse of the solar nebula was most likely triggered by a shock wave from a nearby supernova explosion. The Sun formed in the center, with the planets surrounding it in a thin disk.

Explanation:

Answer:

by using this formula you will get it

Explanation:

number of mole = number of particles÷ Avogadro's number

n=3.51×10^23÷ 6.02×10^23

n = 0.58 moles

Answer:

To determine the change in mass of A over the given time period, we need to find the difference between the initial mass of A and the final mass of A.

From the given table, we can see that the initial mass of A at t = 0 (start time) is 12.4 g and the final mass of A at t = 60 minutes (end time) is 6.2 g.

Therefore, the change in mass of A over 60 minutes is:

Final mass of A - Initial mass of A

= 6.2 g - 12.4 g

= -6.2 g

The negative sign indicates that the mass of A decreased over time, which means that A underwent some kind of reaction or process that caused it to lose mass.

The change in mass of A over 60 minutes is -6.2 grams.

To determine the change in mass of A over 60 minutes, we need to compare the initial mass to the final mass.

From the given information, we can see that the mass of A decreases over time.

Let's calculate the change in mass.

Initial Mass of A: 12.4 g

Final Mass of A: 6.2 g

Change in Mass of A = Final Mass of A - Initial Mass of A

= 6.2 g - 12.4 g

= -6.2 g

The change in mass of A over 60 minutes is -6.2 grams.

Note that the negative sign indicates a decrease in mass.

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Answer:

The wolf gets energy from other Animals through Cellular respiration. it's a carnivore

The rabbit gets energy from Carbohydrates,Fats.... obtained through different sources. A common example is the grass. It's an herbivore

The plant gets energy from the sun during photosynthesis. It's Autotrophic.

The mushroom gets energy from the decomposition of other organic matter. It's heterotrophic.

Explanation:

In a food chain; The Wolf eats the rabbit, when the Wolf dies, decomposers such as mushrooms breaks down its body returning it to the soil, where it provides nutrients for plants

Answer:

The refractive index can be seen as the factor by which the speed and the wavelength of the radiation are reduced with respect to their vacuum values: the speed of light in a medium is v = c/n, and similarly the wavelength in that medium is λ = λ0/n, where λ0 is the wavelength of that light in vacuum.

Explanation:

Answer: \(BaCl_2\) is the limiting reagent and \(Al_2(SO_4)_3\) is the excess reagent.

Explanation:

To calculate the moles :

\(\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}\)    

\(\text{Moles of aluminium sulphate}=\frac{150g}{342.15g/mol}=0.438moles\)

\(\text{Moles of barium chloride}=\frac{200g}{208.23g/mol}=0.960moles\)

The balanced chemical reaction is:

\(Al_2(SO_4)_3+3BaCl_2\rightarrow 2AlCl_3+3BaSO_4\)  

According to stoichiometry :

3 moles of \(BaCl_2\) require = 1 mole of \(Al_2(SO_4)_3\)

Thus 0.960 moles of \(BaCl_2\) will require=\(\frac{1}{3}\times 0.960=0.320moles\)  of \(Al_2(SO_4)_3\)

Thus \(BaCl_2\) is the limiting reagent as it limits the formation of product and \(Al_2(SO_4)_3\) is the excess reagent as it is left.

The Microscope part and their right descriptions are as follows

Iris Diaphragm: A. Increases or decreases the light intensity

Objective Lens System: B. After light passes through the specimen, it next enters this lens system

Stage: C. Platform that supports a microscope slide

Adjustment Knob: D. Causes stage (or objective lens) to move upward or downward

Condenser: E. Concentrates light onto the specimen

Other parts of a microscope and their description that you should know about includes;

Eyepiece - The lens that you look through to see the image of the specimen.

Body tube - The tube that connects the eyepiece to the objective lenses.

Arm - The part of the microscope that supports the body tube and connects it to the base.

Base - The part of the microscope that supports the arm and provides stability.

Illuminator - The light source that provides light for the microscope.

Stage clips - The clips that hold the microscope slide in place on the stage.

Revolving nosepiece - The part of the microscope that holds the objective lenses and allows them to be rotated into place.

The above answer is in response to the full question below;

Match the names of the microscope parts in column A with the descriptions in column B. Place the letter of your choice in the space provided.

1. Iris diaphram

2. Objective lens system

3. Stage

4. Adjustment knob

5. Condenser

Increases or decreases the light intensity

2. After light passes through the specimen, it next enters this lens system

3. Platform that supports a microscope slide

4. Causes stage (or objective lens) to move upward or downward

5. Concentrates light onto the specimen

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Based on the data provided, the equation of the reaction is:

Enthalpy of neutralization is the heat change when one mole of hydrogen ions from an acid reacts with one mole of hydroxide ions from an alkali to produce one mole of water.

The equation of the reaction of KOH and HNO3 is given below:

\(KOH + HNO_3 \rightarrow KCl + H_2O\)

1 mole of KOH reacts with 1 mole of HNO3 to produce 1 mole of water.

Volume of KOH = 30 mL = 0.03 L

moles of KOH = 0.03 × 0.234 = 0.00702 moles

Therefore, 0.00702 moles of water are produced

Heat produce = mass × specific heat × temperature difference

Volume of solution = 60 mL

density of solution = 1.0 g/mL

mass of solution = 60 mL × 1.0 g/mL = 60 g

Heat produced = 60 × 4.18 × 5.6

Heat produced = 1404.48 J

Enthalpy of neutralization = 1404.48 J/0.00702 moles

Enthalpy of neutralization = 200068.37 J/mol

Enthalpy of neutralization = 200 kJ/mol

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Answer:

Increase of pressure increases the coordination number during crystallization e.g. by applying pressure the NaCl type crystal structure having 6:6 coordination number changes to CsCl type crystal having coordination number 8:8.

welc!! you Σ=)

The amount of carbon dioxide in the air is increasing in a large city due to the growing number of vehicles. The mayor wants to plant more trees.  I totally agree with the mayor's suggestions.

Growing number of vehicles contributes towards carbon emissions into the atmosphere. Driving a car with gasoline as its fuel produces three carbon emissions. All of the emissions that take place across a company's value chain and are not covered by scope 2.

These emissions aren't caused by the business or the things it makes. Carbon emissions from operating a gasoline-powered vehicle are significant. Scope 3 applies since the product, not the company's machines, is what causes the emissions. There are three types of carbon emissions: 'Scope 1' or 'Direct Emissions' Direct GHG is produced at sources where the fuel is burned there and then. Examples of scope 1 emissions are personal automobiles and gas stoves. Planting more trees will result in minimizing the harmful effect of these gases upon the environment.

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Answer:

Explanation: Liquid Chromatography  

I'm sorry if i'm wrong

Answer: FRACTIONAL DISTILLATION separation method

Explanation:

The process by which esters are synthesized involves the reaction between a carboxylic acid and an alcohol. During this process, an excess of one of the reactants which is carboxylic acid is used. This helps to increase the rate of the chemical reaction thereby moving the equilibrium constant of the reaction towards the products.

Excess carboxylic acid mixed with the product of the reaction which is an ester can be separated using FRACTIONAL DISTILLATION separation method. This is a separation method that is used for separation of liquids with close boiling points. Example include components of petroleum, alcohol and water solutions, mixture of esters and carboxylic acids.

The process involves the introduction of a fractionating column between a flask and a condenser. The flask, which contains the impure mixture to be separated, is heated. The vapour of the liquids move into the fractionating column and they are cooled by the glass surface. The liquid with the higher boiling point (less volatile) condenses and falls back into the flask. While the one with the lower boiling point ( more volatile) distils over into the condenser and is collected as the first distillate. The esters has lower boiling point than carboxylic acids, therefore they are collected as the first distillate.

Answer: Kilograms

Explanation: Milliliters and Kilometers are the wrong unit of measurement, and Milligrams are too small. Kilograms would be most appropriate to measure the weight of a heavy animal.

The calculations listed provide a comprehensive understanding of the thermodynamic performance of the Rankine cycle power plant and the water requirements of the plant.

This is a thermodynamics problem involving an ideal Rankine cycle power plant that uses water as its working fluid. The problem requires the calculation of various parameters, including the work done by the turbine, work consumed by the pump, heat input, heat rejected, efficiency, and mass flow rates of water and cooling water.

The problem also requires a comparison of the mass flow rate of cooling water to the residential water use of a person in the US. The solution to this problem involves applying the principles of thermodynamics, specifically the Rankine cycle, and using relevant equations to calculate the required parameters.

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Answer:

Mendeleev had left the noble gases out of his periodic table.

Explanation:

Mendeleev's periodic table is pictured in the image attached to the question.

Mendeleev's table obviously lacked the noble gases. The reason for this grave omission is simple; the noble gases were not known as at the time when he formulated his periodic table. There weren't any known elements  whose properties were similar to the  properties of the noble gases. This would have lead him to suspect their existence.

Answer:

a

Explanation:

hope this helps for now

Answer:If a liquid is heated the particles are given more energy and move faster and faster expanding the liquid. The most energetic particles at the surface escape from the surface of the liquid as a vapour as it gets warmer. Liquids evaporate faster as they heat up and more particles have enough energy to break away.

Explanation:

Electrons are transferred from atoms of sodium to atoms of phosphorous The sodium atom looses electron and the phosphorus atoms gains electrons.

The electron is a subatomic particle with an elementary electric charge of -1. Electrons are the first generation of the lepton particle family and are widely regarded as elementary particles due to the lack of known components or substructure.

This transfer causes the sodium atoms  to acquire positive charge and phosphorous to acquire negative charge .

Thus, the sodium and phosphorus atoms strongly attract with each other.

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Your question is incomplete, most probably, your question was

Complete the paragraph about the formation of sodium phosphide.

Electrons are transferred from atoms of

and the phosphorus atoms

to atoms of

C. This transfer makes the sodium atoms

As a result, the sodium and phosphorus atoms strongly

each other.

Considering the ideal gas law, the volume occupied by 3.25 moles of an ideal gas at a temperature of 18.00°C is 686.71 L.

An ideal gas is the behavior of those gases whose molecules do not interact with each other and move randomly. Under normal conditions and under standard conditions, most gases exhibit ideal gas behavior.

An ideal gas is characterized by three state variables: absolute pressure (P), volume (V), and absolute temperature (T), related by a simple formula called the ideal gas law:

P×V = n×R×T

Where:

In this case, you know:

Replacing in the ideal gas law:

1.13 atm×V = 3.25 mol× 0.8205 L.atm/K.mol× 291 K

Solving:

V = (3.25 mol× 0.8205 L.atm/K.mol× 291 K)÷ 1.13 atm

V= 686.71 L

Finally, the volume is 686.71 L.

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Answer:

d. A weak base

Explanation:

For this question, we have to start with the reaction between \(HF\) and \(NaOH\). So:

\(HF~+~NaOH~->~NaF~+~H_2O\)

Now, we have to analyze each compound:

Fluorhydric acid HF this is a strong acid because it has the ability to produce hydronium ions \(H^+\)

Sodium hydroxide NaOH this is a strong base because it has the ability to produce hydroxide ions \(OH^-\)

Sodium fluoride NaF is a salt in which the cation is \(Na^+\) and the anion is \(F^-\)

Water Is a neutral molecule usually the solvent

Now, we have the reaction of a strong acid with a strong base. If we remember the conjugated base theory, a strong acid will produce a weak base. So, NaF is a weak base. We also have water, but this is a neutral molecule. With this in mind, the answer is d.

I hope it helps!

Answer:

Volume = 3.4 L

Explanation:

In order to calculate the volume of CO₂ produced when 15.2 g of CaCO₃ is heated, we need to first write out the balanced equation of the thermal decomposition of CaCO₃:

CaCO₃ (s) + [Heat] ⇒ CaO (s) + CO₂ (g)

Now, let's calculate the number of moles in 15.2 g CaCO₃:

mole no. = \(\mathrm{\frac{mass}{molar \ mass}}\)

                 = \(\frac{15.2}{40.1 + 12 + (16 \times 3)}\)

                 = 0.1518 moles

From the balanced equation above, we can see that the stoichiometric molar ratios of CaCO₃ and CO₂ are equal. Therefore, the number of moles of CO₂ produced is also 0.1518 moles.

Hence, from the formula for the number of moles of a gas, we can calculate the volume of  CO₂:

mole no. = \(\mathrm{\frac{Volume \ in \ L}{22.4}}\)

⇒ \(0.1518 = \mathrm{\frac{Volume}{22.4}}\)

⇒ Volume = 0.1518 × 22.4

                 = 3.4 L

Therefore, if 15.2 g of CaCO₃ is heated, 3.4 L of CO₂ is produced at STP.

a. The rate law for this reaction is: Rate = k[Cl] [H₂]. This means that the rate of the reaction is directly proportional to the concentrations of both Cl and H₂ molecules.

Rate law is an equation that describes the rate of a chemical reaction as a function of the concentrations of reactants. The rate law allows us to describe how the rate of a reaction changes when the concentrations of reactants are changed. It is derived from the rate equation, which is a mathematical expression that can be used to calculate the rate of a reaction from the concentrations of the reactants and the rate constant.

b. The rate law for this reaction is: Rate = k[O] [Os]. This means that the rate of the reaction is directly proportional to the concentrations of both O and Os molecules.
c. The rate law for this reaction is: Rate = k[NO₂]₂. This means that the rate of the reaction is directly proportional to the square of the concentration of NO₂ molecules.

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Complete Question:

Taking into account definition of percent yield, the percent yield for the reaction is 54.22%.

In first place, the balanced reaction is:

CH₄+ 2 O₂ → CO₂ + 2 H₂O

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The following rule of three can be applied: if by reaction stoichiometry 16 grams of CH₄ form 36 grams of H₂O, 5 grams of CH₄ form how much mass of H₂O?

mass of H₂O= (5 grams of CH₄×36 grams of H₂O) ÷16 grams of CH₄

mass of H₂O= 11.25 grams

Then, 11.25 grams of H₂O can be produced when you burn 5.00 g of methane

The percent yield is the ratio of the actual return to the theoretical return expressed as a percentage.

The percent yield is calculated as the experimental yield divided by the theoretical yield multiplied by 100%:

percent yield= (actual yield÷ theoretical yield)× 100

where the theoretical yield is the amount of product acquired through the complete conversion of all reagents in the final product, that is, it is the maximum amount of product that could be formed from the given amounts of reagents.

In this case, you know:

Replacing in the definition of percent yields:

percent yield= (6.10 grams÷ 11.25 grams)× 100

Solving:

percent yield= 54.22%

Finally, the percent yield when methane reacts with oxygen to form carbon dioxide and water is 54.22%.

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True, gravimetric analysis requires a precipitation reaction.

Gravimetric analysis is a quantitative analytical technique that involves precipitation of an analyte from a solution, followed by filtration, washing, and drying of the precipitate to obtain a constant weight. The precipitate is then separated from the solution, washed, and dried to remove any traces of the mother liquor.

The mass of the precipitate is then determined using a balance, and the amount of the analyte in the original sample can be calculated using stoichiometry. The weight of the precipitate is then used to determine the amount of the analyte present in the original sample. Therefore, gravimetric analysis requires a precipitation reaction to occur.

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The relative atomic mass of the sample of rubidium is approximately 48.6.

To calculate the relative atomic mass of the sample of rubidium using the given information, we can use the following steps:

Calculate the contribution of each isotope to the average atomic mass based on their abundance:

Isotope 1: Relative abundance = 72%, Mass number = 48

Isotope 2: Relative abundance = 28%, Mass number = 50

Contribution of isotope 1 = (72/100) * 48

Contribution of isotope 2 = (28/100) * 50

Sum the contributions of each isotope to obtain the average atomic mass:

Average atomic mass = Contribution of isotope 1 + Contribution of isotope 2

Calculate the values for the contributions and sum them up.

Round the average atomic mass to the appropriate number of significant figures.

Let's perform the calculations:

Contribution of isotope 1 = (72/100) * 48 = 34.56

Contribution of isotope 2 = (28/100) * 50 = 14.00

Average atomic mass = Contribution of isotope 1 + Contribution of isotope 2

Average atomic mass = 34.56 + 14.00 = 48.56

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Answer:

That means we do not need to use chemical reactions to separate them. ... The one liquid component in milk is water, and the other is fatty oil. ... Identify the type of substances (solid, liquid or gas) that are mixed in each

Explanation:

Answer:

\( \huge \sf \colorbox{pink}{hey \: there}\)

Explanation:

The mixture of clay or sand with water is muddy. The small clay particles become suspended in the water. This kind of mixture is called a suspension. Suspensions are opaque; that means they are cloudy and we cannot see through them very well.

The balanced molecular equation for the reaction between sodium hydroxide (NaOH) and aluminum chloride (\(AlCl_3\)) in aqueous solution can be written as follows: 2NaOH(aq) + 3\(AlCl_3\)(aq) → 3NaCl(aq) + \(Al(OH)_3\)(s)

In this reaction, sodium hydroxide (NaOH) reacts with aluminum chloride (\(AlCl_3\)) to form sodium chloride (NaCl) and aluminum hydroxide (\(Al(OH)_3\)). The coefficients in the balanced equation indicate the stoichiometric ratio between the reactants and products.

The physical states of the substances are indicated by the symbols (aq) for aqueous solutions and (s) for the solid precipitate.

The reaction is a double-displacement reaction, also known as a precipitation reaction. Double-displacement reactions involve the exchange of ions between two compounds, resulting in the formation of a precipitate.

In this case, sodium hydroxide and aluminum chloride react to form sodium chloride and aluminum hydroxide, with aluminum hydroxide being the white solid precipitate.

It's worth noting that the actual reaction might involve hydrated forms of the compounds, such as NaOH·x\(H_2O\) and \(AlCl_3\)·y\(H_2O\). However, for simplicity, these hydrated forms are not included in the balanced equation.

Overall, the balanced equation represents the chemical reaction between sodium hydroxide and aluminum chloride, showing the reactants, products, and their stoichiometric ratios.

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Molarity corresponds to the number of moles of solute in a liter of solution. So, we have the following expression:

We will use molecular weight (MW) to calculate the moles present in 65 g of calcium chloride.

MW= 110.98 g/mol

So, molarity will be:

Volume: 500mL = 0.5 L

The answer will be 1.2 M