Is it an element or homogeneous

Sodium chloride is an ionic compound. The chemical name of Sodium chloride is NaCl.

Ionic compounds are made up of ions. They have charged particles. Ionic compounds when dissolved in solvents they form ions. Sodium chloride losses Na + and cl ions. Magnesium oxide will form mg2+ and O2 ions.

Ionic compounds dissolve in polar solvents. Examples are water, methanol and formamide. For ionic compounds to dissolve there will be ionic compounds will form.

Ionic bonds are not directional. There would be electrostatic or columbic attraction will be form in molecules.  The bonding seen in ionic compounds is called ionic bonding. There are two types of ions seen in molecules such as positive ions and negative ions.

Therefore, Sodium chloride is an ionic compound. The chemical name of Sodium chloride is NaCl.

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Answer: B

Explanation: JUST TOOK THE QUIZ

Answer:

It must be based on a hypothesis

Explanation:

if i remember correctly

Norway is a Nordic nation in North-Western Europe that borders Sweden, Finland, and Russia. Due to its reputation for having an exceptionally cold winter season, it has grown to be a very famous tourist destination in Europe, yet more than half of its yearly tourists arrive during the milder months of May to August.

The lowest temperature ever recorded in Norway was -51.4°c on New Year's Day in 1886. Although temperatures and meteorological conditions around the world vary, Norway may experience some rather extreme lows. Norway has a variety of climatic characteristics that explain why it has the coldest climate in all of Europe. Here are a couple of them justifications.

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The separation of the components of a mixture is based upon the fact that each component has different physical properties. The components of a mixture are separated based on their physical properties.

A mixture is the physical combination of two or more substances suspended in the form of a solution, suspension, or colloid. Mixtures generally are of two types: homogenous and heterogenous mixtures. Homogenous mixtures have a uniform composition as the particles are uniformly distributed. On the contrary, heterogeneous mixtures have a non-uniform appearance because of their easily distinguishable constituents distributed across the mixture.

The components of a mixture can be separated based on their physical properties by the methods like distillation, chromatography, filtration, etc. The physical properties based on which the components of mixtures can be separated include boiling point, ability to dissolve, or the size of constituent particles.

The varying physical properties contribute to separating molecules by evaporation, filtration, handpicking, etc.

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ph of 0.05M hydrochloric acid is 1.3 .

pH = -log10[H+] 

       = -log10[0.05] – log10[5 × 10-2] 

       = 2 – log5 

       = 2 – 0.6990  

       = 1.301

We already know that HCl is a powerful acid. As a result, it totally dissociates in an aqueous solution. As a result, the concentrations of H⁺ and HCl are the same. As a consequence, the pH of the aqueous solution of HCl is 1.31.

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In the quantum mechanical model of the atom, an electron is viewed as a wave-particle that occupies a three-dimensional space near the nucleus. The movement of the electron is describes be a function, which is also called an atomic orbital.

An electron possesses dual nature, i.e. it has both wave as well as particle nature.  

According to this theory, since there is wave associated with every electron so, it also possesses a wave function ψ.

However, there is no such physical significance of ψ but ψ² has.

ψ² tells the maximum probability of finding an electron in a particular region.

This region where the probability of finding an electron of an atom is maximum is known as atomic orbital.

There are different shapes of the atomic orbitals.

Some of the orbitals and their shapes are mentioned below:

(I) s orbital - spherical

(ii) p orbital - dum-bb-ell

(iii) d orbital - double dum-bb-ell

(iv) f orbital - ( no discrete shape)

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ca(oh)2(aq) + 2hcl(aq)®2 h2o(l) + cacl2(s)  

the limiting reactant when 1.00 g of each reactant is combined is ca(oh)2.

What is limiting reagent?

The stoichiometry of chemical processes states that a specific number of reactants are required for the reaction to be complete. Other names for them are limiting reactants and limiting agents.

In a chemical reaction, there are two techniques to determine the limiting reagent. Comparing the mole ratio of the reactants involved in a chemical reaction is one way. Comparing the masses of the reactants involved in a chemical reaction is another way. The limiting reagent is the one that reacts with a smaller amount of product.

Since, Ca(OH)2 is in the ratio 1:2 with HCl, which means for two moles of HCl, one mole of Ca(OH)2 is consumed which is required in smaller amount, Thus if Ca(OH)2 is present in less amount the reaction depend on its concentration and is limited by it. so ca(oh)2 is the limiting reagent.

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The resonance structure of the c―h bond in acetone, (ch3)2c═o, has a pka of 19.2 is given below

When a periodic force is applied to a system and its natural frequency is equal to or nearly equal to the frequency of the applied force, resonance is the phenomenon of enhanced amplitude that results.

Since propane lacks a double bond or an atom with a lone pair of electrons, the negative charge on acetone's conjugate base cannot be sustained by resonance structure.

If the applied vibration's frequency matches the body's natural frequency, the body will begin to vibrate with a very significant amplitude. Resonance is the name given to this phenomena.

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The assertion "It is true that  " since exothermic processes are favored and the sign of the enthalpy change tells us whether or not a process is endothermic or exothermic .

The phrase "the sign  of [tex]dH_{sol}[/tex] tells us whether or not solution will form " is not a fact .

All chemical reactions fall into one of two categories: exothermic reactions or endothermic reactions. When energy is lost to the environment during an exothermic reaction, the enthalpy change of the reaction is negative. A type of reaction known as an endothermic reaction results in a positively altering equilibrium by absorbing energy from the surrounding environment.

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Answer:

d

Explanation:

it is the smallest

If 28.4 g of HgO decomposes and produces 2.0 g of oxygen, then 26 grams of Hg is produced.

Decomposition reactions occur when complex chemical entities split apart into smaller components. Decomposition reactions often demand energy input.

There are three different kinds of breakdown reactions: thermal, photolytic, and electrolytic.

[tex]Mass_{reactant[/tex] = [tex]Mass_{product}[/tex]

[tex]Mass_{mercury oxide[/tex] = [tex]Mass_{mercury} + mass_{oxygen}[/tex]

28g =        [tex]mass_{mercury}[/tex] + 2g

   [tex]mass_{mercury}[/tex] = 26g

Thus, 28.4 g of HgO decomposes and produces 2.0 g of oxygen, then 26 grams of Hg is produced.

[tex]percentage mass_{mercury} = \frac{mass_{mercury}}{mass_{mercury}oxide}[/tex]  X 100%

= 26g/28g

= 93%

thus  93% is the percent by mass of Hg present in HgO.

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The correct volume of the object is 974 L.

The term density refers to the ratio between mass and volume. We know that we could be able to obtain the mass or the volume using the formula for density. Knowing that;

Density = mass/volume

volume = mass/density

Volume =  1.000 × 10^3 g/ 1.027 g/l

Volume = 974 L

The correct volume of the object is 974 L.

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Answer:It actually does not matter in which order you add the three different liquids into your jar; the layers will always end up being the same: The corn syrup settles on the bottom, the colored water is in the middle and the vegetable oil floats on the top.

Explanation:

EPR (ESR) Spectroscopy is compatible with leading brands but with fair and reasonable price.

EPR (ESR) Spectrometers for free radical, polymer materials, catalytic mechanism research.

What is Spectrometers ?

An equipment used to measure a physical quantity's spectrum is called a spectrometer. The term "spectrometer" is commonly used to refer to an optical spectrometer that measures the electromagnetic spectrum of light. Mass spectrometry and Auger electron spectroscopy, for instance, both use different types of spectrometers.

Measurements of light's characteristics in a particular area of the electromagnetic spectrum are made using an optical spectrometer. Light intensity is typically the variable quantity that is measured, though it might sometimes be anything else, such polarization.

The wavelength of light, which is frequently stated in a fraction of a meter but can also be expressed in a unit directly proportional to the energy of a photon, like the wave number, is the independent variable.

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EPR (ESR) Spectroscopy is compatible with leading brands but with fair & reasonable price. EPR (ESR) Spectrometers free radical, polymer materials, catalytic mechanism research.

What is Spectrometers ?

An equipment used to measure a physical quantity's spectrum is called a spectrometer. The term "spectrometer" is usually used to refer to an optical spectrometer that measures the electromagnetic spectrum of light.

Mass spectrometry and Auger electron spectroscopy, as an example , both use differing types of spectrometers.Measurements of light's characteristics during a particular area of the electromagnetic spectrum are made using an optical spectrometer. candlepower is typically the variable quantity that is measured, though it'd sometimes be anything else, such polarization.

The wavelength of sunshine , which is usually stated in a fraction of a meter but can also be expressed in a unit directly proportional to the energy of a photon, just like the wave number, is that the independent variable.

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Standard deviation refers to the percentage of responses that fall inside particular points on a bell curve, whereas relative standard deviation refers to the amount of a standard deviation as a measure of the mean. Although both can be stated as departures from the mean, neither can be negative.

The standard deviation measures how far a given collection of data deviates from the mean value. In contrast, a type of standard deviation is the relative standard deviation. The standard deviation calculates the accuracy of your results. It demonstrates how closely the outcomes matched the mean value.

While relative standard deviation quantifies the precision or standard deviation of the mean value. While relative standard deviation is referred to as RSD, the standard deviation is referred to as SD.

In chemistry, mathematics, and statistical calculations, the phrases standard deviation, and relative standard deviation are most frequently employed. These phrases are used to gauge a result's degree of precision. While relative standard indicates the amount of standard deviation, standard deviation measures how closely a result varies from the mean value. The standard deviation can be determined to be modest or significant. RSD and SD make analysis performance predictions. Our analysis is more accurate if these values are modest, and vice versa.

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Three specific types of laboratory waste containers are: Chemical Waste Container, Bio Hazardous Waste Container and Radioactive Waste Container.

Chemical waste is collected in appropriate containers able to be properly closed.

Biohazardous waste containers keep infectious waste separate from everyday trash.

Radioactive Waste containers stock solid radioactive waste produced during radio isotopes manipulation.

The Material Safety Data Sheet (MSDS) is a detailed fact sheet summarizing information about a chemical's hazardous ingredients.

Nuclear (radioactive) waste is hazardous to all forms of life and the environment.

Long term storage of radioactive waste is needed. It is important the stabilization of the waste into a form which will neither react nor degrade over many years.

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Answer: How to convert only to one significant figure:

Explanation:

The method of rounding to a significant figure is often used as it can be applied to any kind of number, regardless of how big or small it is. When a newspaper reports a lottery winner has won £3 million, this has been rounded to one significant figure. It rounds to the most important figure in the number.

To round to a significant figure:

look at the first non-zero digit if rounding to one significant figure

look at the digit after the first non-zero digit if rounding to two significant figures

draw a vertical line after the place value digit that is required

look at the next digit

if it's 5 or more, increase the previous digit by one

if it's 4 or less, keep the previous digit the same

fill any spaces to the right of the line with zeros, stopping at the decimal point if there is one

Examples

Round 53,879 to 1 significant figure, then 2 significant figures.

5|3879 to 1 significant figure is 50,000

53|879 to 2 significant figures is 54,000

Notice that the number of significant figures in the question is the maximum number of non-zero digits in your answer.

Round 0.005089 to 1 significant figure, then 2 significant figures.

0.005|089 to 1 significant figure is 0.005

0.0050|89 to 2 significant figures is 0.0051

Sorry this was long,

But I hope this helped!

An extensive property is a property that depends on the amount of matter in a sample.

An intensive property is a property of matter that depends only on the type of matter in a sample and not on the amount.  

Examples of Extensive properties:

Examples of Intensive properties:

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The balanced chemical equation for the precipitation reaction of CaCl₂ and Cs₃PO₄ in an aqueous solution is:

3Ca²⁺(aq) +  2PO₄³⁻(aq) → Ca₃(PO4)₂(s)

The insoluble salts Ca₃(PO4)₂ and CsCl are created when the calcium ion in CaCl₂ interacts with the phosphate ion in Cs₃PO₄. CaCl₂(aq) + CsO₄(aq) Ca₃(PO4)₂(s) + CsCl.  

The unbalanced reaction is:

CaCl₂(aq) + Cs₃PO₄(aq) → Ca₃(PO4)₂(s) + CsCl(aq)

To balance the calcium:

3CaCl₂(aq) + Cs₃PO₄(aq) → Ca₃(PO4)₂(s) + CsCl(aq)

The chlorides:

3CaCl₂(aq) + Cs₃PO₄(aq) → Ca₃(PO4)₂(s) + 6CsCl(aq)

And the Cs:

3CaCl₂(aq) + 2Cs₃PO₄(aq) → Ca₃(PO4)₂(s) + 6CsCl(aq)

This is the balanced reaction, the ionic equation is:

3Ca²⁺(aq) + 6Cl⁻(aq) + 6Cs⁺(aq) + 2PO4³⁻(aq) → Ca₃(PO4)₂(s) + 6Cs⁺(aq) + 6Cl⁻(aq)

Subtracting the ions that don't react:

3Ca²⁺(aq) +  2PO4³⁻(aq) → Ca3(PO4)2(s)

This is the net ionic equation

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Environmental researchers have collected rain acidity data for several decades. They want to see if there is any evidence that attempts to reduce industrial pollution have produced a trend toward less acidic rainfall. They should display their data in a Time plot.

Acid Rain: What Is It?

Any type of precipitation that contains acidic elements, such as sulfuric or nitric acid, that falls to the ground from the atmosphere in wet or dry forms is referred to as acid rain, also known as acid deposition. Rain, snow, fog, hail, and even acidic dust might fall under this category.

Only one variable—the acidity level of the rainfall over a specific time period—will be present in the data used to create the plot or graph. But because the gbwre data is time-dependent, the plot is a time series. As a result, this is a two-dimensional univariate plot with time on the other axis and the acidity label Rainfall on the first. The time series plot is therefore the appropriate type of graph to use to illustrate this kind of data.

Questions:

Environmental researchers have collected rain acidity data for several decades. They want to see if there is any evidence that attempts to reduce industrial pollution have produced a trend toward less acidic rainfall. They should display their data in a(n)... a. Bar graph b. Time plot c. Histogram d. Box plot

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Answer:

0.278m/s (3sf) OR 0.28m/s (2dp)

Explanation:

1km = 1000m

1h = 3600s (60mins x 60 secs)

1000m/3600s (simplify)

10m/36s (simplify by dividing both sides by 36)

(1/36)m/s OR 0.27777777777ms/s

Round up:

0.28m/s (2dp) or 0.278m/s (3sf)

An aqueous potassium iodate solution is made by dissolving 508 grams of  in sufficient water so that the final volume of the solution is 2.90 L then its  molarity is  0.818 M .

Calculation ,

Given mass ( m ) = 508 grams

molar mass ( M ) = 214 g/mol ( known )

Number of moles ( n ) = given mass/molar mass = 508 grams / 214 g/mol

Number of moles ( n ) = 2.37 moles

Volume of the  aqueous potassium iodate ( V ) in liter = 2.9 L

molarity is calculated as,

Molarity = number of moles / volume of the solution =  2.37 moles / 2.9 L

Molarity = 0.818 M

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1. Sally's average speed is 35.38 miles/hr. She deserves no ticket

2. The 20.0 ft tall building is 6096 mm tall.

For the first problem, recall that: speed = distance/time.

The distance covered by Sally is 97 km within 102 minutes.

1 km = 0.62 miles

97 km =  0.62 x 97

            = 60.14 miles

60 minutes = 1 hr

102 minutes = 102/60

                    = 1.7 hours

The average speed of Sally can be calculated as:

               60.14/1.7 = 35.38 miles/hr

Since the speed limit is 65 mi/hr, this means Sally's speed is still within acceptable limits and does not deserve a ticket.

For the second problem:

1 ft = 12 inches

20 ft = 12 x 20

          = 240 inches

1 inch = 2.54 cm

240 inches = 2.54 x 240

                = 609.6 cm

1 cm = 10 mm

609.6 cm = 10 x 609.6

                 = 6096 mm

Thus, the 20.0 ft tall building is 6096 mm tall.

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If you originally had 200 g of substance A , 50 g of reactant have left after 4 half - lives .

At four half life  the fraction remaining of a substance is 1/16 or 0.25 of initial concentration and percentage remaining is 25 % .

So , If you originally had 200 g of substance A is present then amount of reactant  left after 4 half-lives = 200 g × 0.25 = 50 g .

Example of half - life is given below ,

Within one half-life, the amount of radioactive nuclei present at any particular time will be reduced to half. For instance, if a sample contained 100g of Cf-251 at some point, there would still be 50g of Cf-251 after 800 years. There would only be 25g left after an additional 800 years (a total of 1600 years).

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According to the question, the heat of the reaction has been -22 kJ/mol where a negative sign illustrates the occurrence of the exothermic reaction.

The heat of reaction may be defined as the amount of energy that is significantly absorbed or liberated by the system in order to form the products. This is calculated on the basis of bond energies.

The energy constituent by each bond in the reactant has been the heat of the reactant, and the energy of the product has been the heat of the product.

The heat of the reaction can be calculated by the following formula:

The reactant molecules are [tex]CH_3OH[/tex] and C≡O.

The bond energy of the reactant is as follows:

[tex]H_r_e_a_c_t_a_n_t[/tex] = 3 × C-H + C-O + O-H + C≡O.
                = 3 × 413 + 358 + 467 + 1070

                = 3134 KJ/mol.

The product molecule has been [tex]CH_3COOH[/tex].

The bond energy of the product is as follows:

[tex]H_p_r_o_d_u_c_t[/tex] = 3 × C-H + C-O + O-H +C-C + C = O.

              = 3 × 413 + 358 + 467 + 347 + 745.

              = 3156 KJ/mol.

The heat of the overall reaction is as follows:

ΔH = [tex]H_r_e_a_c_t_a_n_t - H_p_r_o_d_u_c_t[/tex]

     = 3134 - 3156 = -22KJ/mol.

Therefore, the heat of the reaction has been -22 kJ/mol where a negative sign illustrates the occurrence of the exothermic reaction.

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Compared to water, a carbonated soft drink with a pH of 3 is 10,000 times more acidic.

What is meant by acidic in nature?

Acids include different types of acids and vinegar; they differ from bases in that they have a lower pH. The Latin term acidus, which means "sour or harsh," is where the word acid, which originally meant "of the taste of vinegar," originates from.

Bases are compounds that can accept a proton, while acids are substances that can donate a proton.

The answer is 10,000 because every pH unit change makes something 10 times more acidic.

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Answer:

1800

Explanation:

Use a Kilojoules to joules converter. Or to do it is:

One kilojoules is equal to 1000 joules:

1kJ = 1000J

The energy E(J) in joules (J) is equal to the energy E(kJ) in kilojoules times 1000:

E(J) = E(kJ) × 1000

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According to the research, the correct option is electron energies are quantized. Max Planck was a popular German physicist who proposed that electron energies are quantized, considered to be the founder of quantum theory.

It is a probabilistic and quantification theory by Max Planck giving the name of the minimum amount of clusters to atoms that radiates energy formed by corpuscles in the form of light or heat only, as small packets.

In this sense, Planck assumed that light does not travel as a particle but as packets of light in the form of electromagnetic radiation which he called quanta, this was the basis on which what is known as quantum theory was founded.

Therefore, we can conclude that according to the research, the correct option is electron energies are quantized. Max Planck was a popular German physicist who proposed that electron energies are quantized, considered to be the founder of quantum theory.

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The mass of HNO3 obtained is 12.46 g from the given reaction.

The chemical reaction is :

Potassium Nitrate + Sulphuric acid ------> Potassium Bisulphate + Nitric acid.

The above reaction is basically used for the making of nitric acid.

Less than 200 degree celcius the Nitric acid if more than 200 degree celcius then it will form Potassium Sulphate.

Now,

1 mol of KNO3 reacts with1 mol of concentrated H2SO4 to give 1 mol HNO3

Molar Mass of KNO3 = 101.1 g

Molar mass of H2SO4 = 98.07 g

Mass of H2SO4 that can react with 20 g of KNO3 = (20 g* 98.07 g )/ 101.1 g

= 19.4 g

Molar mass of nitric acid= 63.01 g

Hence mass of nitric acid  produced by 20 g of KNO3 = (20 g * 63.01 g ) / 101.1 g = 12.46 g

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We want to see what happens to the particle's speed in a given material as the temperature changes and it faces a change of phase.

We will see that the particles in the gas (vapor of water) have a larger speed than the ones in the liquid water.

As we increase the temperature of the material, the kinetic energy of the particles that make the material increase (thus the speed increases). This causes the particles to move more, and this is why as we increase the temperature, is likely to see an increase in the volume.

Then as we increase the temperature of liquid water and that water starts to change of phase (by boiling) the kinetic energy of the particles increase, and thus, the speed increases. then the particles will be moving faster than the particles of the water in the pan.

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