a piece of magnesium ribbon is reacted with excess hydrochloric acid to produce aqueous magnesium chloride and hydrogen gas. the volume of the dry hydrogen gas produced is 45.6 milliliters. the temperature of the gas is 293 k, and the pressure is 99.5 kilopascals calculate the volume this dry hydrogen gas would occupy at stp

Answer:

The correct answer is option A

Explanation:

The extreme temperatures lead to the unfolding of a polypeptide chain resulting in a change in composition and generally a loss of function. If the protein working as an enzyme denatures, it will make that protein to lose its enzymatic activity.

Answer:

Denatures

Explanation:proteins are very sensitive to temperature change

The number of valence electrons related to an element's chemical properties due to combining capacity of valence electron of elements with other elements.

It depends upon the number of electrons in outermost shell. In simple ionic compound valence is the number of electrons gained or lost by an atom of an element to complete its octet. Element having less than four electrons in their valence shell; prefer to lose of the electrons to complete their octet.

For example, Na, Mg  and Al have 1, 2 and 3 electrons in their valence shells respectively. They lose these electrons to have valency of 1, 2 and 3 respectively. On the other hand elements having five or more than five electrons in their valence shells, gain electrons to complete their octet. For example: N ,O and Cl have 5, 6 and 7 electrons in their valence shells respectively. They gain 3, 2 and 1 electrons respectively to complete their octet.

Hence in this way, number of valence electrons change the chemical properties of elements.

To learn about Valence electrons, click Here

brainly.com/question/9678979

#SPJ4

Answer:

picture plz

Explanation:

Answer:

electric current is the rate of charge flow past a given point in an electric circuit.

Explanation:

Hopefully this is the answer

Answer:An electric current is a stream of charged particles, such as electrons or ions, moving through an electrical conductor or space. It is measured as the net rate of flow of electric charge past a region.

Explanation:

Given,                                                                                                                                                                                          The density of chromium metal =7.20 g/cm³.

We are required to find the density of chromium in lb/ft³.

1 foot = 30.48 cm.

Let's use dimensional analysis to convert g/cm³ to lb/ft³

Let's first convert g to lb using the conversion factor,

1 g = 0.00220462 lb.

Then convert cm³ to ft³ using the conversion factor , 1 ft³ = 28316.8 cm³.

Let's put all the conversion factors together:

(7.20 g/cm³) × (0.00220462 lb/g) × (28316.8 cm³/1 ft³)

Multiplying the above values, we get:

0.283 lb/ft³

Therefore, the density of chromium in lb/ft³ is 0.283 lb/ft³.

#SPJ11

Learn more about density:

https://brainly.com/question/1354972

The amount of heat needed to boil 132 g of water (\(H_{2} O\)), beginning from a temperature of 7.4 °C, is 298 kJ.

The amount of heat needed to boil water can be calculated using the following equation:

Q = m * ΔH

Where Q is the amount of heat required, m is the mass of the water, and ΔH is the heat of vaporization of water, which is 40.7 kJ/mol.

First, we need to determine the number of moles of water in 132 g of water:

n = m / M

where M is the molar mass of water, which is approximately 18.015 g/mol.

n = 132 g / 18.015 g/mol = 7.326 mol

Now we can calculate the amount of heat required to vaporize this amount of water:

Q = n * ΔH

Q = 7.326 mol * 40.7 kJ/mol = 298 kJ

Therefore, the amount of heat needed to boil 132 g of water starting from a temperature of 7.4 °C is 298 kJ.

Learn more about heat:

https://brainly.com/question/27991746

#SPJ11

Answer:

2-carbohydrate

Explanation:

Sucrose belongs to the carbohydrate family. It is a disaccharide which is derived from the condensation of glucose and fructose.

Sucrose is a specific type of organic compound classified as a carbohydrate and the correct option is option 2.

Carbohydrates are essential biomolecules made up of carbon, hydrogen, and oxygen atoms. Sucrose, also known as table sugar, is a disaccharide formed by the chemical bonding of one glucose molecule and one fructose molecule.

Plants produce sucrose through photosynthesis and use it as a readily available source of energy. When consumed by animals, including humans, sucrose is broken down into its constituent monosaccharides to provide fuel for various cellular processes.

Thus, the ideal selection is option 2.

Learn more about Carbohydrates, here:

https://brainly.com/question/33874241

#SPJ6

The line spectra of an atom offers conclusive evidence that electron energies are quantized.

Neils Bohr showed that electrons in an atom can absorb or emit energy when they move from one energy level to another. This principle is the basis upon which the spectra of atoms is built.

The true statements about the atomic spectra is;

Learn more about atomic spectrum: https://brainly.com/question/2049494

The high-density brine drains into the water beneath the ice and in the process, the sea ice freshens while the salinity of the underlying water decreases, becoming less dense (Option C).

Sea ice is usually less salty than the ocean water it freezes from. During the process of ice formation, salt in the ocean water is expelled from the ice as it grows; most of the salt is ejected into the ocean but some remain trapped inside pockets of brine within the ice. When the air temperature falls below the freezing point of seawater (usually around -1.8 °C), water molecules start to form ice crystals, which grow and aggregate into a solid sheet of ice.

During this process, the salt rejected by the growing ice also accumulates, causing the salinity of the remaining brine to increase. Some of the brine is encapsulated within ice crystals, but most are trapped in the spaces between neighboring crystals.

Thus, the correct option is C.

Learn more about brine: https://brainly.com/question/14667236

#SPJ11

Answer:

(CH3COO)2 + redP + Cl2 → ClCH2COOH + HCl

Explanation:

This is an example of halogenation of carboxylic acids at alpha carbon atom. In this reaction, red phosphorus and chlorine are treated with carboxylic acids having alpha hydrogen atom followed by hydrolysis to form alpha chloro carboxylic acid.

Transporting a beaker or flask of hexanes out of a hood requires proper precautions to minimize the risk of spillage and exposure. Use a carrier appropriate for the size and shape of the container, hold it securely by the sides, and keep it upright and steady during transport.

Handling and transporting chemicals in a laboratory is an essential part of experimental work. However, some chemicals can pose hazards if not handled properly.

Hexanes are a type of organic solvent commonly used in chemical laboratories. They are flammable and can pose a fire hazard if not handled properly. When transporting a beaker or flask of hexanes out of a hood, it is essential to take precautions to minimize the risk of spillage and exposure.

Firstly, before transporting the beaker or flask, make sure that the lid or stopper is securely in place. This will prevent the hexanes from splashing out of the container during transport. If the beaker or flask does not have a lid or stopper, use a watch glass or a piece of aluminum foil to cover the opening.

Next, use a suitable carrier to transport the beaker or flask. A carrier is a specialized tool designed to hold laboratory glassware securely during transport. There are various types of carriers available, including rubber grippers, tongs, and padded clamps. Choose the carrier that is appropriate for the size and shape of the beaker or flask you are transporting.

When picking up the beaker or flask, use two hands and hold it securely by the sides. Avoid holding it by the neck or lip, as this can increase the risk of spillage. Once the beaker or flask is securely in the carrier, lift it out of the hood and transport it to the desired location.

During transport, keep the beaker or flask upright and steady to minimize the risk of spillage. Avoid walking quickly or turning sharply, as this can cause the hexanes to slosh around and spill out of the container.

Once you have reached your destination, carefully place the beaker or flask on a stable surface and remove the carrier. If you need to transfer the hexanes to another container, do so using a suitable transfer pipette or funnel. By following these guidelines, you can safely transport hexanes and other chemicals in a laboratory setting.

For more such questions on Handling and transporting chemicals.

https://brainly.com/question/14255835#

#SPJ11

The mass of PbCl2 obtained is 18.78 g from 200.0 ml of the original solution.

When a solution of NaCl(aq) is slowly added to a solution of lead nitrate, Pb(NO3)2(aq), a precipitation reaction occurs, resulting in the formation of PbCl2(s). The process is continued until no further precipitation occurs. The precipitate is then collected by filtration, dried, and weighed. In this case, a total of 18.78 g of PbCl2(s) is obtained from 200.0 ml of the original solution.

This reaction can be explained by the principle of double displacement reactions, also known as metathesis reactions. In a double displacement reaction, the positive and negative ions of two different compounds switch places, forming two new compounds. In this case, NaCl and Pb(NO3)2 react to form PbCl2 and NaNO3.

The balanced equation for this reaction is:

2 NaCl(aq) + Pb(NO3)2(aq) → PbCl2(s) + 2 NaNO3(aq)

The amount of PbCl2 obtained can be determined by the stoichiometry of the reaction and the volume of the original solution. From the given information, it is not possible to calculate the concentration of NaCl or Pb(NO3)2 in the original solution. However, knowing the volume of the original solution allows us to determine the mass of PbCl2 obtained.

To calculate the mass of PbCl2, we use the equation:

mass = (volume of original solution) × (concentration of PbCl2)

In this case, the mass of PbCl2 obtained is 18.78 g from 200.0 ml of the original solution.

It is important to note that the concentration of PbCl2 in the original solution cannot be directly determined from the given information. Additional information, such as the concentration of NaCl or Pb(NO3)2, would be required to calculate the concentration of PbCl2 in the original solution.

Learn more about mass here:-

https://brainly.com/question/11954533

#SPJ11

If you have 500 grams of Zn(NO₃)₂, approximately 359.90 grams of ZnCl₂ will be produced.

To determine the number of grams of ZnCl₂ produced when 500 grams of Zn(NO₃)₂ is used, we need to calculate the molar masses and use stoichiometry.

The molar mass of Zn(NO₃)₂ can be calculated by summing the atomic masses of each element:

Zn: 65.38 g/mol

N: 14.01 g/mol

O: 16.00 g/mol (x 6 because there are 6 oxygen atoms)

Total molar mass of Zn(NO₃)₂ = 65.38 + (14.01 x 2) + (16.00 x 6) = 189.38 g/mol

Next, we use the balanced equation to determine the stoichiometric ratio between Zn(NO₃)₂ and ZnCl₂. From the equation, we can see that the ratio is 1:1.

Therefore, the number of moles of ZnCl₂ produced will be the same as the number of moles of Zn(NO₃)₂ used.

To calculate the number of moles of Zn(NO₃)₂, we divide the mass by the molar mass:

Number of moles of Zn(NO₃)₂ = 500 g / 189.38 g/mol ≈ 2.642 mol

Since the ratio between Zn(NO₃)₂ and ZnCl₂ is 1:1, the number of moles of ZnCl₂ produced will also be 2.642 mol.

Finally, we calculate the mass of ZnCl₂ by multiplying the number of moles by its molar mass:

Mass of ZnCl₂ = 2.642 mol x 136.29 g/mol (molar mass of ZnCl₂) ≈ 359.90 g

For more such questions on ZnCl₂ visit:

https://brainly.com/question/21081762

#SPJ8

To distinguish between D and L enantiomers, one can use a polarimeter to measure the rotation of polarized light. D enantiomers rotate the plane of polarized light to the right, or clockwise, while L enantiomers rotate it to the left, or counterclockwise. This is known as the optical activity of a compound.

D and L enantiomers are two types of stereoisomers that differ in their spatial orientation. The designation of D or L refers to the orientation of the asymmetric carbon atom in a molecule. The D enantiomer has its functional group on the right side of the molecule when the asymmetric carbon is oriented to the top, while the L enantiomer has its functional group on the left side.

Another method is to use a chiral column in chromatography, which separates the enantiomers based on their molecular shape and orientation. This technique is useful for separating racemic mixtures, which contain equal amounts of both D and L enantiomers. After separation, the enantiomers can be identified using spectroscopic techniques such as infrared or nuclear magnetic resonance spectroscopy.

In summary, the distinction between D and L enantiomers can be made using techniques such as polarimetry or chiral chromatography, which rely on differences in optical activity and molecular shape and orientation.

More on enantiomers: https://brainly.com/question/31009837

#SPJ11

A. Ammonia is the limiting reactant.

B. Theoretical yield of urea is 215.3 kg.

C. Percent yield for the reaction is 86.0%

D. The mass of the excess carbon dioxide left is approximately 54.1 kg.

a) To identify the limiting reactant, we should compare the amount of products formed from each reactant. The chemical equation for the formation of urea \((NH_2CONH_2)\) by combining ammonia \((NH_3)\) and carbon dioxide \((CO_2)\) is as follows:

\(2 NH_3 + CO_2 - > NH_2CONH_2 + H_2O\)

The stoichiometry of the balanced equation indicates that the ratio of ammonia to urea is 2:1.

We can find the number of moles for each reactant using the following masses:

Moles of ammonia = 122.0 kg / 17.03 g/mol = 7.17 mol

Moles of carbon dioxide = 211.4 kg / 44.01 g/mol = 4.80 mol

It takes 14.34 moles of ammonia to react completely with the available carbon dioxide because the ratio of ammonia to urea is 2:1. But the amount of ammonia we have is less than we need - only 7.17 mol. As a result, ammonia is the limiting reactant.

b. Based on the limiting reactant, it is possible to calculate the theoretical yield of urea. We can use the moles of ammonia, which is the limiting reactant, to calculate the moles of urea:

Moles of urea = 7.17 mol / 2 = 3.58 mol

We can determine the theoretical yield of urea using the molar mass of urea (60.06 g/mol) as a starting point:

Theoretical yield of urea = 3.58 mol * 60.06 g/mol = 215.3 kg

C. The actual yield (185.1 kg) is calculated by dividing it by the theoretical yield (215.3 kg), then multiplying the result by 100%.

Percent yield = (185.1 kg / 215.3 kg) * 100% = 86.0%

D. We can calculate the amount of non-limiting reactant that has not reacted yet to determine the excess reactant. Since ammonia is the limiting reactant, we must determine how much excess carbon dioxide there is:

Moles of excess carbon dioxide = Moles of carbon dioxide initially - Moles of carbon dioxide used

= 4.80 mol - (7.17 mol / 2) = 1.23 mol

We can determine the mass of excess carbon dioxide using the molar mass of carbon dioxide (44.01 g/mol):

Excess carbon dioxide = 1.23 mol * 44.01 g/mol = 54.1 kg

Therefore, the mass of the excess carbon dioxide left is approximately 54.1 kg.

Learn more about Limiting reactant, here:

https://brainly.com/question/10090573

#SPJ4

Answer:

The correct answer would be B.

Hope this helps :D

If the scientist changed the size of the container, the pressure within would rise.

The response rate keeps about constant when the gas sample volume rises (for instance, if additional gas is poured into a flexible container like a balloon). Because the increase in gas moles changes proportionally with the increase in container volume, the concentration doesn't actually change.

Air pressure increases in warm environments. A force is created when two air molecules collide. As a result of the faster motion brought on by the molecules' increased velocity, collisions between the molecules of a gas increase when it is heated. Each molecule experiences additional force as a result, raising the air pressure.

To know more about volume change in container visit:-

https://brainly.com/question/20562077

#SPJ13

Answer:

sorry i can't figure out the exact answer but i think it is 2amu if it is wrong again i'm so sorry

Explanation:

Hydrogen has three isotopes, which include hydrogen, deuterium, and tritium with atomic masses of about 1 amu, 2 amu, and 3 amu. Then the average atomic mass will be 2 amu. Thus option b is correct.

Isotopes are defined as a variation of an element that posses same atomic number but different atomic mass.

Isotopes has nearly same chemical behavior by different physical properties.
It can also be defined as the variant of chemical elements that posses same number of protons and electrons but different number of neutrons.

Radioactive isotopes are used in agriculture, food processing, pest control, archaeology and medicines.

Thus, Hydrogen has three isotopes, which include hydrogen, deuterium, and tritium with atomic masses of about 1 amu, 2 amu, and 3 amu. Then the average atomic mass will be 2 amu. Thus option b is correct.

To learn more about isotopes, refer to the link below:

https://brainly.com/question/11680817

#SPJ5

Your question is incomplete but probably your fell question was

Hydrogen has three isotopes, which include hydrogen, deuterium, and tritium with atomic masses of about 1 amu, 2 amu, and 3 amu, respectively. Considering the average atomic mass of hydrogen that appears on the Periodic Table, which statement is correct?

a. 1.5 amu

b. 2 amu

c. 3 amu

d. 1.01 amu

Answer:

Sedimentary rocks are formed when sediment is deposited out of air, ice, wind, gravity, or water flows carrying the particles in suspension. This sediment is often formed when weathering and erosion break down a rock into loose material in a source area.

Im not sure if this answers your question but here!

Sedimentary rocks are one of three main types of rocks, along with igneous and metamorphic. They are formed on or near the Earth’s surface from the compression of ocean sediments or other processes.

Answer: \(1s^22s^22p^63s^23p^64s^2\) , oxidation state = +2

Explanation:

Electronic configuration represents the total number of electrons that a neutral element contains. We add all the superscripts to know the number of electrons in an atom. The electrons are filled according to Afbau's rule in order of increasing energies.

The electronic configuartion of Calcium with atomic number 20  is :

\(Ca:20:1s^22s^22p^63s^23p^64s^2\)

As calcium can easily lose its two valence electrons to attain stability , its oxidation state is +2.

\(Ca^{2+}:18:1s^22s^22p^63s^23p^6\)

Answer:

Option b) polyatomic ions

Explanation:

Polyatomic ions are ions consisting of two or more atoms.

From the question given above, we can see that each ions consist of more than one atom as shown below:

Ions >>>>>> Number of atom present

NH4+ >>>>> 2

CO32− >>>> 2

PO43− >>>> 2

Thus, we can say that the above ions are polyatomic ions.

Answer:

It's C.

Explanation:

Answer: Both CO2 and C2H6 are non-polar compounds and generally like compunds will dissolve. CO2 will dissolve in C2H6.

Answer:

negative

Explanation:

1nm=10^-6 cm.

476 nm = 4.76E-5 cm

Spectator ion is the term given to the ions existing solely to maintain charge neutrality over a chemical species.

Spectator ions are ions that only exist to maintain charge neutrality. The presence of these ions is necessary to preserve charge neutrality even if they don't change chemically or physically during a process. Ionic solids are chemical neutral compounds as they have equal amounts of distribution of cations and anions throughout their composition.

When all the charges in a volume total up to zero, charge neutrality happens; it is neutral and neither positive nor negative. In other words, it indicates that a system's total positive charge and total negative charge must be equal.

To know more about spectator ions, refer:

https://brainly.com/question/9512088

#SPJ4

Answer:

41.3 °C

Explanation:

From the question given above, the following data were obtained:

Mass (M) of water = 27.56 g

Heat (Q) loss = 2443 J

Final temperature (T2) = 62.5 °C

Initial temperature (T1) =?

NOTE: The specific heat capacity (C) of water is 4.18 J/g°C

Thus, we can obtain the initial temperature of the water by using the following formula:

Q = MC(T2 – T1)

2443 = 27.56 × 4.18 (62.5 – T1)

2443 = 115.2008 (62.5 – T1)

Divide both side by 115.2008

2443 / 115.2008 = (62.5 – T1)

21.20645 = 62.5 – T1

Collect like terms

21.20645 – 62.5 = – T1

– 41.3 = – T1

Divide both side by – 1

– 41.3 /– 1= – T1 / –1

41.3 = T1

T1 = 41.3 °C

Thus, the initial temperature of the water was 41.3 °C

The ranking of terms importance in deciding on the true structure of a molecule:

Experimental evidence> Lewis structure> formal charge

So, from this, we can conclude that the ranking of terms importance in deciding on the true structure of a molecule:

Experimental evidence> Lewis structure> formal charge

Learn more about lewis structures here:

brainly.com/question/12476602?referrer=searchResults

brainly.com/question/4144781?referrer=searchResults

Answer:

High spec heat cap

Explanation:

Specific heat =   Q/(m *Tchange)

re-arrange to

Tchange =  Heat/(m *spec heat)

   this shows that a high  spec heat (in the denominator) will require a lot of heat (in the numerator) to change the Temp much  

You think we can answer this question without seeing the cubes you're mentioning?

Entropy is a measurable physical characteristic and a scientific notion that is frequently connected to a condition of disorder, unpredictability, or uncertainty.

Molar enthalpy is the amount of energy per mole. Enthalpy is a thermodynamic quantity that corresponds to a system's total heat content according to this definition. It is equivalent to the system's internal energy plus the sum of the pressure and volume products. This value's unit of measurement is KJ/mol.

Entropy is assumed to be 1 kB/particle

kB: Boltzmann Constant = 1.3806*10^(23)/JK

Entropy, S = 1.3806*10^(-23) /JK

We are aware that S = Q/T

provided T = 83.85 k

and that Q = S*T = S*83.85k = 1.157*10(-21) J / particle.

Since 1 mole = 6.022x1023 particles of heat energy,

the formula for an is 1.157*10(-21)*6.022*10^23, which is 6.967*102 J/mole.

Argon's molar enthalpy is Q/n,

where n is the number of moles,

and ΔH equals 0.6967 KJ/mole.

To know more about Molar enthalpy, click on the link below:

https://brainly.com/question/25758173

#SPJ4