Use the table of observed changes to answer the question.

Change # Reacts with another substance? Temperature change? Gas, sound, or light produced? New substance formed?
1 yes yes yes yes
2 no yes yes no
3 yes yes yes yes
4 no no no no
Which changes shown in the table are physical changes?

(1 point)

2 and 4


2 and 3


1 and 2


1 and 4

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 lindeman-hinshelwood mechanism explains that role of m as a stabilizing force for the reaction.

By steady state concentration,

d[O] dt = d[O3] dt =0 (7) we can solve for [O] and [O3]

What is the Lindemann-Hinshelwood mechanism?

The unimolecular processes that take place in the gas phase are explained by the Lindemann-Hinshelwood mechanism. This method is typically employed in both isomerization reactions and gas phase breakdown. The isomerization of cyclopropane is an illustration of isomerization through a Lindemann mechanism.

The steady state approximation makes the assumption that, after a brief initial period, the concentration of the chemical intermediates will be constant throughout time, meaning that the rate of change in the intermediate's concentration over time will be zero.

Thus by steady state concentration,

d[O] dt = d[O3] dt =0 (7) we can solve for [O] and [O3]

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% yield of SnS2 = 0.337 X 100 / 0.567 = 59.44 %

% yield of SnS2 = 59.44 %

Balanced chemical reaction is

SnBr4(aq)  +  2Na2S(aq)    --->   4NaBr(aq)   +   SnS2(s)  

First calculate limiting reactant

molarity of SnBr4 = 0.418 M

volume of SnBr4 = 0.0451 L (1 ml = 0.001 L then 45.1 ml =45.1 X 0.001 = 0.0451 L)

molarity of Na2S = 0.133 M

volume of Na2S = 0.0466 M ( 1 ml = 0.001 L then 46.6 ml =46.6 X 0.001 = 0.0466 L)

no.of moles = molarity X volume of solution in liter

moles of SnBr4 = 0.418 X 0.0451 = 0.0189 mol

moles of Na2S = 0.133 X 0.0466 = 0.0062 mol

According to balanced chemical reaction 1 mole of SnBr4 react with 2 mole of Na2S molar ratio between SnBr4 to Na2S is 1:2 therefore to react with 0.0189 mole of SnBr4 required Na2S = 0.0189 X 2 / 1 = 0.0378 moles Na2S but Na2S given only 0.0062 mole therefore Na2S is limiting reactant

Limiting reactant = Na2S

According to balanced chemical reaction 2 mole of Na2S produce 1 mole of SnS2 molar ratio between Na2S to SnS2 is 2:1 therefore 0.0062 mole of Na2S produce SnS2 = 0.0062 X 1 / 2 = 0.0031 moles

Mole of SnS2 produced = 0.0031 mole

Molar mass of SnS2 = 182.81 g/mol

Gm of compound = no. of moles X molar mass

Gm of SnS2 formed = 0.0031 mol X 182.81 g/mol = 0.567 g

Gm of SnS2 formed = 0.567 g

Theoretical yield of SnS2 = 0.567 g

Actual yield of SnS2 = 0.337 g

Theoretical yield of SnS2 = 0.567 g

% yield = Actual yield X 100 / theoretical yield

Substitute the value

% yield of SnS2 = 0.337 X 100 / 0.567 = 59.44 %

% yield of SnS2 = 59.44 %

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Answer:

Nitrogen is a chemical element with an atomic number of 7 (it has seven protons in its nucleus). Molecular nitrogen (N2) is a very common chemical compound in which two nitrogen atoms are tightly bound together. Molecular nitrogen is a colorless, odorless, tasteless, and inert gas at normal temperatures and pressures.

Explanation:

i had this quest before but it might be different 4 u tho.:)))))))

With seven protons in its nucleus, nitrogen has the atomic number 7 and is a chemical element.

Thus, Two nitrogen atoms are securely linked together to form the chemical molecule known as molecular nitrogen. At normal temperatures and pressures, molecular nitrogen is a colorless, odorless, tasteless, and inert gas.

Numerous different forms of contaminants contain atoms of nitrogen. Nitric oxide and nitrogen dioxide can be produced during high temperature combustion when nitrogen gas is present, as in car engines.

Both gases contribute to the creation of nitric acid, which is a component of acid rain, and peroxyacetyl nitrate (PAN), which is a key component of smog.

Thus, With seven protons in its nucleus, nitrogen has the atomic number 7 and is a chemical element.

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Answer:

3%

Explanation:

11 - 10.603 = 0.379  
0.379/11 = ~0.03 so 3%

Answer: Change the way we run our economy.

Explanation: The way that the world, as a whole, runs its government and economy, is destroying the environment. If we can change this, and find another, better, way to run our countries and cities, the environment will get better, and we won't ruin our planet.

Answer:

Explanation:

dilute hydrochloric acid is added to distilled water to increase the ionization of water.

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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Answer:

d

Explanation:

it is the smallest

The maximum wavelength of electromagnetic radiation which can ionize this atom is 320 nm or 320 x 10^-9 m.

The ionization energy is the minimum amount of energy that should be given to an element to eject electrons out of it i.e ionizing it.

The relation between Energy(E) and wavelength(λ) is as follows

E = hc/λ

Here h = Planck’s Constant = 6.626 x 10-34 J s

c = speed of light = 3 x 10^8 m/s

λ = wavelength of electromagnetic radiation

Putting the given values in the above equation

6.24 x 10^-19 J = 6.626 x 10^-34 x 3 x 10^8/ λ

λ = 320 x 10^-9 m.

Thus, the maximum wavelength of electromagnetic radiation which can ionize this atom is 320 nm or 320 x 10^-9 m.

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Answer:

It must be based on a hypothesis

Explanation:

if i remember correctly

Among the given options, Sodium nitrate (NaNO3) is a compound that is neither an acid nor a base. Thus, the correct option for this question is A.

The properties of acids are as follows:

Sodium nitrate (NaNO3) is classified in the category of salt that can be significantly developed in the reaction of sodium hydroxide (NaOH) which belongs to a base, and nitric acid (HNO3) which belongs to an acid.

Therefore, sodium nitrate (NaNO3) is one of the compounds that is neither an acid nor a base. Thus, the correct option for this question is A.

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The high-density behavior of nuclear symmetry energy is among the most uncertain properties of dense neutron-rich matter.

The cost of generating more neutron-rich nuclear systems is measured by the nuclear symmetry energy. According to the system's density. The mechanics of supernova explosions, the characteristics of neutron stars, and the gravitational waves produced by their mergers are all greatly affected by knowledge of the density dependence of nuclear symmetry energy. Understanding the kinetics and outcomes of their collisions in laboratory studies, as well as the characteristics of nuclei, is crucial.

Within the parabolic approximation, the Equation of State (EOS) of homogeneous neutron-rich nucleonic matter with isospin asymmetry = (np)/ and density can be stated in terms of the energy per nucleon E(n, n).

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coal is burned and co2 will be emitted into the atmosphere.

What is ppm?

PPM, or parts per million, is the most effective way to express the level of performance or chemical concentration in a bigger mixture. This could be used to describe the components of water, the faulty rate of a provider, etc. Being a ratio of two quantities of the same unit, it is theoretically a dimensionless measure that is represented as a percentage and is better suited to representing lesser concentrations of chemicals in gases, liquids, or solids.

When a coal is burned, it releases a certain amount of carbon dioxide (CO2) in relation to the energy it produces. Compare the quantity of CO2 released per unit of energy output or heat content to compare emissions across fuels.

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After eluting and drying the plate, it is vital to be able to view the spots in order to employ TLC.

The chromatography method known as thin-layer chromatography can be used to separate non-volatile materials (TLC). Thin-layer chromatography is performed on a sheet of glass, plastic, or aluminium foil that has been coated with a thin coating of an adsorbent material—typically silica gel, aluminium oxide (alumina), or cellulose.

UV light is often used to quickly and non-destructively detect spots (compounds) on a TLC plate. Aromatic systems and strongly conjugated systems greatly absorb UV radiation. The majority of TLC plates contain zinc sulphide, which when exposed to short-wavelength UV makes them seem green.

When the TLC plate is put in the chamber and covered, iodine sublimes  with the compounds on the plate, resulting in yellow-brown blotches and interacts

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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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Based on the law of conservation of mass, the  reading of the balance will be 200.0 g.

According to the law of conservation of mass, matter cannot be created nor destroyed but can change from one from to another.

In the given experiment, the chemical is placed on a balance in an airtight container and weighed bore it was ignited and allowed to burn completely. This means that the reaction occurred in a closed system, such that matter is not being exchanged with the surrounding.

The reading obtained in the balance before the reaction took place took into account the amount of air present in the container.

Therefore, no change in the reading of the balance will be observed and the balance will read 200.0 g.

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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

Hope this helped you!

Answer:

Newton's first law of motion is explained in the below statements

What is Newton's first law of motion?

Newton's first law asserts that if a body is at rest or travelling at a constant speed in a straight line, it will remain at rest or continue to move in a straight path at a constant speed until acted on by a force.

Explanation:

Some examples of Newton's first law are:

1. A rock at rest: Unless pushed by nature or by another force, a rock sitting on the ground will remain there for thousands of years. It will not be dispersed in various locations.

2. The sudden application of breaks in a vehicle: When a driver suddenly uses the brakes, we tend to move forward. The vehicle comes to a halt as a result of the brakes. However, we are moving due to inertia. That is why seat belts are essential for road safety. 

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Why is boiling at standard temperature and pressure an inadequate method of processing for canned foods? Boiling to 100°C will kill vegetative C. botulinum cells, but any spores will survive to temperatures of 120°C.

Why is boiling at standard temperature and pressure an inadequate method of processing for canned foods? Boiling to 100°C will kill vegetative C. botulinum cells, but any spores will survive to temperatures of 120°C.

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Lubricant decrease friction by causing a slight separation between solid surfaces, so they don't contact each other.

A lubricant, also known as lube or lubrication, is a chemical that aids in reducing friction between surfaces in contact, hence lowering the heat produced when the surfaces move. Additionally, it might be used for force transmission, the transportation of foreign objects, or the heating or cooling of surfaces.

The body's sliding surfaces are robust in part due to lubricin, a little-known protein that serves as nature's most efficient "grease." The body's most potent boundary lubricant, lubricin was found to coat the surfaces of joint cartilage.

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The complete question is -

____ decrease friction by causing a slight separation between solid surfaces, so they don't contact each other.

The partial pressure of the solution is  0.39 torr.

The Raoult's Law states that, the partial pressure of the solution is equal to the product of the mole fraction of the solute and the partial pressure of the pure solvent.

Hence;

Partial pressure of the pure solvent =  20.57 torr

Moles of water = 500 g/18 g/mol = 27.8 moles

Moles of ethanol = 25.0 g/46 g/mol = 0.54 moles

Total number of moles = 27.8 moles + 0.54 moles = 28.34 moles

Hence;

Partial pressure of solution = 0.54 moles/28.34 moles * 20.57 torr

= 0.39 torr

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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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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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Dipole-dipole interactions between H2O molecules produce the greatest intermolecular forces in a molecule.

It simply refers to a line made up of two wires, each of which is connected to a power outlet using a negative and positive signal. When a dipole appears, several atoms may have the same ionization spectrum or may be split into negative and positive regions. Both partial negative (-ve) and partial positive (+ve) signs are used to denote it.

A molecule's form affects polarity. Due to the 2 OH bonds and the consequent dipole, the molecule with 2 lone pairs, such as water, is very polar. The vector sum of the various polar bonds produces the dipole.

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Answer:

Emission Spectrum of Hydrogen. When an electric current is passed through a glass tube that contains hydrogen gas at low pressure the tube gives off blue light. When this light is passed through a prism (as shown in the figure below), four narrow bands of bright light are observed against a black background.

Explanation:

that hydrone molecules Diprotic acids

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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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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If p=T, then we must have ~p=F. Now that we've done ~p, we can combine its truth value with q's truth value to find the truth value of ~p∧q.

What is Compound statement?

A compound statement is a combination of two or more simple assertions. For instance, a compound would be, "It's snowing and I wish I was outside, but I made the error of enrolling in this course." statement.

Therefore,

Suppose the compound statement (p implies q) and (not q)is true. what is the truth value of p?

If p=T, then we must have ~p=F. Now that we've done ~p, we can combine its truth value with q's truth value to find the truth value of ~p∧q.

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Below is a diagram of the product's structure. The product is amide.

Aniline's N atom functions as a nucleophile, whereas propanoic acid's carbonyl group functions as an electrophilic center. A nucleophilic acyl substitution process takes place when aniline and propanoic acid are combined and heated. An amide is created during this reaction. At the carbonyl center, the reaction mechanism follows the addition-elimination pathway. The complete response mechanism is displayed here. An acyl group (R-C=O) joined to a nitrogen atom forms the functional group of an amide, which is typically an organic compound: The simplest amides are ammonia (NH3) derivatives with an acyl group in place of one hydrogen atom.

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