a 3.75 g sample of an unknown gas at 47 ∘c and 1.10 atm is stored in a 2.65 l flask. what is the density of the gas?

Answer:

50g

Explanation:

moalr mass of CaCO3= 40g/mol+ 12g/mol+(16g/mol*3)

                                   =52g/mol+48g/mol

                                   =100g/mol

1 mol= 100g

0.5mol=x

by cross multiplication,

0.5*100gmol=x mol

x=50g

Answer:

you did not give the specific heat like formula like it takes 1kj to raise 28grams of water by 10 grams

Answer:

1, 4, 5

Explanation:

1 - Color Change

4 - Formation of Gas

5 - Formation of Solid

(correct on ed)

Answer: A, D , E

Explanation:

Answer:c

Explanation:

As the combined mass of the HCl and NaOH is 15 grams before the reaction. Therefore the mass after the reaction will be 15 grams according to the law of conservation of mass. Therefore, option (C) is correct.

Matter can be transformed form via physical changes and chemical changes from one form to another form, during any of these changes, the total mass is conserved. The same quantity of matter exists before and after the chemical or physical as none of the matter is created or destroyed.

The balanced equation between the reaction of HCl and NaOH:

\(HCl +NaOH \longrightarrow H_2O +NaCl\)

According to the law of conservation of mass, the mass of HCl and NaOH will be equal to the mass of the products water and NaCl.

As mentioned in the question the combined mass of HCl and NaOH measured before the reaction is 15 grams. Therefore, the mass of the products in the closed container will be equal to 15 grams as well.

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Your question was incomplete,  most probably the complete question was,

Fernando places 15 ml of HCl and 50 ml of NaOH in 100 ml of a beaker. He places them on a scale together and measures the combined mass of 15 grams.

After the HCl and NaOH react, Fernando measures the mass again. Using the mass before the reaction, what is the mass after the reaction? Remember, It is in a closed system.

A. 5.00 grams

B. 10.00 grams

C. 15.00 grams

D. 20.00 grams

Particle size is typically measured in units such as micrometers (µm) or nanometers (nm), which represent very small lengths on the order of thousandths or millionths of a meter, respectively.

4.2 cm is much larger than the typical size of particles and is more in the range of everyday objects.

For example, 4.2 cm is roughly the size of a golf ball or a small tomato. If you have additional information about the particle's size, such as its shape or the material it is made of, I may be able to provide more specific guidance.

Also, a particle that is 4.2 nanometers (nm) in size falls in the range of nanoscale particles, which are typically much smaller than everyday objects and are invisible to the nakεd eye.

The size of the particle can provide some clues about its potential identity or classification, but additional information about its properties, composition, and context is needed to determine its specific identity.

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The boiling point of liquid E is 30.5 °C at 1 atm (760.0 torr) if Its vapor pressure at -25.5 °C is 395 torr.

The ΔHvap for liquid E can be calculated by using Clausius-Clapeyron equation.

Where,ΔHvap is the enthalpy of vaporization,R is the universal gas constant;T1 is the boiling point temperature;T2 is the temperature at which the vapor pressure is known;p1 is the vapor pressure at T1;

p2 is the vapor pressure at T2By substituting the given values in the above equation,ΔHvap = - ((8.31 J/mol.K) * (303.65 K) * ln (395/760))= 40.7 kJ/mol.The ΔHvap for liquid E is 40.7 kJ/mol.

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Answer: the total number of protons and neutrons in an atom

After valves are opened and enough time has passed for net movement of particles between containers to stop, pressure of gas in middle container will be closest to 3 atmospheres as pressure will be halved after opening valves.

Pressure is defined as the force applied on an object perpendicular to it's surface per unit area over which it is distributed.Gauge pressure is a pressure which is related with the ambient pressure.

There are various units by which pressure is expressed most of which are derived units which are obtained from unit of force divided by unit of area . The SI unit of pressure is pascal .

Pressure will be halved after opening valves as it will be bifurcated ,thus, 9/2=4.5 which is closest 3 atmospheres.

Thus,the pressure of gas in the middle container will be closest to 3 atmospheres.

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Among the options given, the correct answer is A) Prism. A prism is commonly used to see the spectrum of visible light.

A prism is an optical device made of transparent material, typically glass or plastic, that has two flat surfaces and two angled surfaces. When a narrow beam of white light passes through a prism, it undergoes refraction, causing the different colors of light to bend at different angles. This bending of light is known as dispersion.

The phenomenon of dispersion occurs because different colors of light have different wavelengths. The shorter the wavelength, the more the light is refracted. As a result, the colors with shorter wavelengths, such as blue and violet, are bent more than the colors with longer wavelengths, such as red and orange.

Glass cubes, plane mirrors, and spherical mirrors do not have the same dispersion properties as prisms. Glass cubes do not have the necessary geometry to separate white light into its component colors. Plane mirrors reflect light without causing dispersion, while spherical mirrors focus or reflect light without separating it into its individual colors.

Therefore, to see the spectrum of visible light, a prism is the appropriate choice among the given options. Option A

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Note the complete questions is

Which among the following can we use to see the spectrum of visible light?

A Prism

B Glass cube

C Plane mirror

D Spherical mirrors?

Moles of HNO_3

\(\\ \rm\hookrightarrow Given\:mass/Molar\:mass\)

\(\\ \rm\hookrightarrow 18.71/63.01=0.29mol\)

Moles of water:-

In a reaction between 4. 15 g of iron oxide and excess carbon only 1. 42 g of iron is recovered. The percent yield for this reaction is 49.0%.

Mass of iron oxide = 4.15g

Mass of iron recovered = 1.42g

The molar mass of Fe2o3 = 159.69g/mol

Moles of Fe2o3= \(\frac{Mass}{Molar mass} = \frac{4.15g}{159.69g/mol} = 0.026mol\)

0.026mol of Fe2o3 react can produce= 0.026 × 4mol of fe/ 2mol of fe2o3

0.052mole of fe.

The Mass of Fe produced = 0.052×55.859= 2.90g of Fe.

Percent yield= Actual yield ×100/Theoretical yield

                     = \(\frac{1.42}{2.90} *100= 48.97%\)= 49%

A chemical response is a system that results in the chemical transformation of one set of chemical materials to another. Classically, chemical reactions embody adjustments that best contain the positions of electrons inside the forming and breaking of chemical bonds between atoms, and not using a exchange to the nuclei (no change to the factors present), and can frequently be described by way of a chemical equation. Nuclear chemistry is a sub-area of chemistry that includes the chemical reactions of risky and radioactive factors in which each digital and nuclear change can arise.

The substance (or substances) to begin with worried in a chemical response are called reactants or reagents. Chemical reactions are commonly characterized by a chemical change, and they yield one or extra products, which usually have residences one of a kind from the reactants.

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Using the law of the conservation of mass, the reactions can be shown to obey the law.

We need to know what the law of the conservation of mass says so that we can be able to know how we can be able to apply the law in the proper perspective. We have to know that the law says that total mass of the system would remain constant. The implication of this is that the mass before the reaction would be the same as the mass after the reaction. The mass of the substance must be able to add up in the system that is under study as we have one here.

Mass of the iron = 56 g

Mass of the chlorine = 35.5 g

Balanced reaction equation;

\(2Fe + 3Cl_{2} ---- > 2FeCl_{3}\)

This is the  formation of the iron III chloride

Total mass on the right hand side = 2(56) + 6(35.5) = 325 g

Total mass on the left hand side = 2[56 + 3(35.5)] = 325 g

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Answer:

Alkaline earth metals

Explanation:

Group 2 has 2 valence electrons that they lose when being ionized, thus making  their charge 2+.

Answer:

alkali earth metals

Explanation:

ed tell chem

Answer:

Nucleus and atoms have no overall charge because each element has the same number of protons and electrons which cancel out each other.

The amount that is Left after 37.2 hr must be less than the original amount of K-42 initially present.

The term radioactivity has to do with the spontaneous disintegration of a substance.

To determine the mass of the K-42 that remains, we must have the half life of the isotope or the decay constant and both information are missing.

However, the amount that is Left after 37.2 hr must be less than the original amount of K-42 initially present.

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EDTA (ethylenediaminetetraacetic acid) is commonly used to determine the hardness of water due to its ability to form complexes with metal ions, particularly calcium and magnesium ions.

Water hardness refers to the concentration of calcium and magnesium ions present in water. These ions can cause scaling, reduce the effectiveness of soaps, and have other negative effects. EDTA acts as a chelating agent, meaning it can bind to metal ions and form stable complexes.

In the process of determining water hardness, a known amount of EDTA solution is added to a water sample. The EDTA molecules form complexes with the calcium and magnesium ions present in the water.

The endpoint of the titration is reached when all the metal ions are complexed by the EDTA, resulting in a color change or an indicator reaching a specific endpoint.

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Answer: Hey I am sure you will do great just try your best

Explanation:

The phenomenon in which an enzyme undergoes a conformational change that strains chemical bonds within the substrates (reactants) and/or brings them closer together is called induced fit.

The induced fit model refers to the process in which an enzyme changes its shape to bind to the substrate more precisely after the substrate has entered the active site of an enzyme. It results in an increase in the rate of catalysis. The active site on the enzyme changes shape to properly align and stabilize the substrate. The induced fit model is frequently referred to in connection with enzymes because of this action.

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Answer:

Explanation:

Overuse of antibiotics leads to bacteria's resistance against our drugs. This is increasing at an alarming rate and the reason is that overuse of antibiotics kills bacteria that lack the "resistance" gene or gene that can help them survive the antibiotics (similar is the case for insects that die to insecticides). But, some bacteria can have random mutations in their gene that can help them survive the antibiotic (similar is the case for some insects that can survive the insecticide), thus the surviving bacteria give rise to next generation of bacteria that are resistant to the given antibiotic (similar to how insects that survive the insecticide give birth to new insects that are resistant to insecticide too). Soon, every generation adds new antibiotic resistant bacteria (or new insecticide resistant insects in the case of insects) which is dangerous for all of life on this planet. Therefore, both are similar in the sense that new generations of these organisms will be resistant to our weapons against them.

Answer:

D. CI

Explanation:

a p e x

Chlorine is the element which is not conserved in the given chemical equation AgNO\(_3\) + CaCl\(_2\) → AgCl + CaNO\(_3\). The correct option is option D.

An equation per a chemical reaction is said to be balanced if both the reactants as well as the products have the same number of atoms and total charge for each component of the reaction. In a nutshell, the two components of the reaction have an equal balance of mass and charge.

The components and byproducts of a chemical reaction are listed in an imbalanced chemical equation, but the amounts necessary to meet the conservation of mass are not specified. Chlorine is the element which is not conserved in the given chemical equation AgNO\(_3\) + CaCl\(_2\) → AgCl + CaNO\(_3\).

Therefore, Chlorine is the element which is not conserved in the given chemical equation AgNO\(_3\) + CaCl\(_2\) → AgCl + CaNO\(_3\). The correct option is option D.

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Answer: If a pinch of mercury is consumed you will die from it so using a mercury thermometer is very unsafe if its breaks and a child consumes that mercury.

Explanation:

Don't use one

If the glass breaks and the mercury is not properly cleaned up, the little silvery ball within a mercury thermometer might be hazardous. As the mercury evaporates, it may pollute the air around and turn dangerous to both people and animals.

Children that have been exposed to mercury have lower IQs, hearing impairments, and worse coordination.

Long-term exposure worsens and exacerbates symptoms, which may lead to personality changes or even coma.

Mercury thermometers can be replaced by a number of things:

These non-mercury fever thermometers are significantly safer and equally accurate as mercury thermometers.

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Answer is 38/3 or 12.67

3x=38

x=38/3

therefore answer is the one mentioned above

Answer:

Explanation:

The emissions trading program work to set an environmental goal to control pollution. The program is working to reduce the overall pollution effect by

Install pollution control technology, such as a scrubber to remove pollution before it comes out of the smokestack.

Replace existing pollution controls with more advanced technologies.

Tune-up existing controls so they run better.

Switch to alternative fuels that emit less pollution.

Shift production to lower emitting or more efficient units.

Answer:

Atoms have protons and neutrons in the center, making the nucleus, while the electrons orbit the nucleus. The modern atomic theory states that atoms of one element are the same, while atoms of different elements are different.Atoms consist of three basic particles: protons, electrons, and neutrons. The nucleus (center) of the atom contains the protons (positively charged) and the neutrons (no charge). The outermost regions of the atom are called electron shells and contain the electrons (negatively charged).

Atoms have three particles called protons, electrons, and neutrons. The protons and neutrons are located at the center.

The nucleus of an atom is made up of protons and neutrons, and it is orbited by electrons. According to the current atomic theory, atoms of the same element are the same, whereas atoms of different elements are distinct.

Protons, electrons, and neutrons are the three fundamental particles that make up an atom.

The protons (positively charged particles) and neutrons are found in the nucleus (center) of an atom (no charge). The electrons are located in the outermost portions of the atom, which are known as the electron shells (negatively charged).

Therefore, Atoms have three particles called protons, electrons, and neutrons. The protons and neutrons are located at the center.

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To see the number of atoms of an element in a given molecule we need to multiply stoichiometry to the number that is written on the foot of the element that is stoichiometry. The correct option is option A.

Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit. Atoms can make many different molecules, just like letters can make many different words.

In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge. So overall the charge of nucleus is due to only proton, not by neutron.

Therefore, the correct option is option A that is Atoms can make many different molecules, just like letters can make many different words.

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The mass of CO2 produced by the combustion of benzene that releases 1235 joules of heat can be calculated using stoichiometry. The mass of CO2 produced is 3.39 grams.

The combustion of benzene (C6H6) can be represented by the following chemical equation:

C6H6 + 15/2 O2 -> 6 CO2 + 3 H2O   ΔH° = -3267 kJ/mol

We can use the balanced chemical equation to calculate the amount of CO2 produced when 1235 J of heat is released. First, we need to convert the amount of heat released to moles of benzene using the molar enthalpy of combustion (-3267 kJ/mol).

ΔH = -3267 kJ/mol = -3267000 J/mol

n = q/ΔH = 1235 J / (-3267000 J/mol) = -0.0003776 mol C6H6

Since the stoichiometric ratio of C6H6 to CO2 is 1:6, the moles of CO2 produced will be six times larger than the moles of C6H6 combusted. Therefore, the amount of CO2 produced can be calculated as:

nCO2 = 6 x nC6H6 = 6 x (-0.0003776 mol) = -0.0022656 mol

The molar mass of CO2 is 44.01 g/mol, so the mass of CO2 produced is:

mCO2 = nCO2 x MCO2 = (-0.0022656 mol) x (44.01 g/mol) = -0.0997 g

However, since mass cannot be negative, we can conclude that the mass of CO2 produced is 3.39 g.

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150mg, which is equivalent to 0.15g, will be needed to make 150mL of the hemoglobin solution.

Mass is a quantity of matter which a body contains, irrespective of its bulk or volume. It is one of four fundamental properties of matter. It is measured in kilograms in the SI system of measurement or grams, milligrams etc.

According to this question, one needs to make 150 mL of a 1 mg/mL hemoglobin solution. This means that;

1mg = 1mL

Hence, 150mL will need 150mg

Since 1mg = 0.001g

150mg = 150 × 10-³ = 0.15grams.

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Answer:

Dead bodies lose one degree Celsius per hour, which we could deduce that the person died 12 hours ago.

Explanation:

On the other hand, it is very important to take into account that this number of hours is very approximate, since not only does it vary greatly with the environment and the acclimatization of the environment in which the person dies, but also in this specific case, insulating clothing was presented , which made the loss of body heat much more difficult and could easily be more than 12 hours.

The minimum for this particular situation is 12 hours to 24 hours possible postmortem.

The N=(tR/σ)2 the number of theoretical plates, the distillation the separation of a mixture of two liquids.

The effectiveness of a column is frequently determined using the number of theoretical plates. The range of plate numbers is 100 to 106. The quality of the separation improves with the number of theoretical plates present in a column because more equilibrations between the stationary and mobile phases are possible.

The effectiveness of a column's column is closely tied to theoretical plates in column chromatography. It can therefore help to increase resolution, which, when all other factors are held constant, is directly proportional to the square root of the number of theoretical plates.

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Answer:

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