An aqueous solution is made with the salt obtained from combining the weak acid hydrofluoric acid, HF, and the weak base methylamine, CH2NH2. Is the solution acidic, basic, or neutral? To find the pH of a solution of NH Br directly, one would need to use

Answer: 2.0g NH3

Explanation:

First we have to make a balanced equation (should be: N2 + 3H2 -> 2NH3) then we convert the N2 (Nitrogen gas) to moles by finding the molar mass of N2 (28.02g) divide that and multiply by the number of moles of Ammonia (NH3). This would give us 2.0g of NH3. Hope that helps!

When 50.2g of magnesium is combined with 40.8g of oxygen, 91 grams of magnesium oxide should be produced.

The law of conservation of mass states that the total mass of a closed system remains constant regardless of the chemical or physical changes that take place within it.

This law suggests that the amount of reactants of a chemical reaction must equate the amount of products of that reaction.

According to this question, magnesium reacts with oxygen gas to produce magnesium oxide. If 50.2g of magnesium reacts with 40.8g of oxygen, then;

50.2 + 40.8 = 91 grams of magnesium oxide will be produced.

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Dry ice, also known as solid carbon dioxide, sublimes when exposed to air.  As dry ice sublimes, it appears to be "smoking" or "fogging" due to the condensation of the gaseous carbon dioxide in the air.

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The sigma bonds and pi bonds does the given  molecule have  is :

(CH₃)₂CCHCH₂CCCOOH , 19 sigma bond and 4 pi bond.

The given molecule given below :

(CH₃)₂CCHCH₂CCCOOH

     H         H   H               O

      |           |     |                 ||

H₂ - C - C = C - C - C ≡ C - C - O - H

            |             |

     H - C - H      H

            |

           H

The single bond in the molecule represent the one sigma bond . the double bond in the molecule represent the one sigma bond and the one pi bond. The triple bond in the molecule represent the one sigma bond and the two pi bond.

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Ethanol use was effect the shortage of corn available on those time because of corn is an ingredient to produce the ethanol. Hence, ethanol use was aligned with the rarity of corn availability on those time. the more ethanol was used, the more rare corn availability for consumer.  

The drought is a condition where the area cant provide enough water supply for a long. Agriculture sector is the most affected sector when the drought occur. The drought cause crop failure, and this condition create domino effect on another sector such as food price get more expensive, and because of food get more expensive, buying power getting low cause small business out of business.

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Answer:

56.58 percent

Answer:

one milliliter

Explanation:

In the metric system, the prefix m stands for “milli”, which means “1/1,000 of”. So 1 ml (milliliter) is only 1/1,000 of 1 l (liter). Therefore, 1 ml is smaller than 1 l.

The marketed medications with pyrrole ring systems are known to have a wide range of biological properties, including the antipsychotic, beta-adrenergic antagonist, anxiolytic, anticancer (leukemia, lymphoma, and myelofibrosis, among others), antibacterial, antifungal, antiprotozoal, antimalarial, and many more.

The relative abundances of the three identified C4H5 isomers vary depending on the type of precursor (1-butyne, 1,2-butadiene, and 1,3-butadiene). The overproduction of hydroxyhempyrolin is what causes pyrrole disorder (HPL). The HPL binds zinc and B6, preventing the body from utilizing them and causes their excretion in the urine and hair. HPL is a neurotoxic biomarker for oxidative stress. Kryptopyrrole testing in the urine is used to identify pyrrole disorders. The goal is to count the HPL molecules in your body. A high level could be a sign of pyrrole dysfunction.

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Let's shift the nitrogen and carbon atoms from left to right since the answer is 2,2,1. Three hydrogen atoms bonded to one carbon form an SP3 hybrid on carbon.

Carbon hybridised with carbon on both sides in SP. There is a triple bond tying these two carbon atoms together. Bonding between carbon atoms and N's SP hybridization Prior to N, the penultimate C is SP2 hybridised (2 bonds and 1 lone pair). The C and N in question have two bonds.

Answer: 2,2,1  Atoms, which are little bits of matter, are what distinguish one chemical element from the others. A negatively charged core nucleus and one or more orbiting electrons make up an atom. There may be the positively charged, somewhat massive protons and neutrons that make up the nucleus.

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The best-fit line of an experimental scatterplot is used to identify any linear patterns in the scattered data.

A line of best fit is a straight line that minimizes the distance between it and certain data. The line of best fit is used to represent a connection in a scatter plot with several data points. Regression analysis' byproduct serves as a tool for predicting indicators and price fluctuations.

A scatter plot's data is most accurately represented by a straight line known as the line of best fit. It is possible for this line to pass through some, all, or none of the points.

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The type of the soil where the water drains too rapidly and it dry our quickly is the sandy soil. The sandy soil has large space between the particles for passing out water through the soil.

The soil that has the large space between the  particles , so that the water can pass out quickly and the soil dry out quickly. The sandy soil is has the rough texture. . The sandy soil drains out quickly as compared to the other soil. The sandy soil is very good for the plants as it has the good drainage.

Thus , the soil that drains out too rapidly and dry out quickly is the sandy soil.

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Final speed after 5.0 seconds if its starting speed were 50 mi/hr is 87.5 mi/hr.

Acceleration is a vector quantity, meaning it has both a magnitude (or size) and a direction. The magnitude of acceleration is measured in units of meters per second squared (m/s²) or feet per second squared (ft/s²). The direction of acceleration is the direction in which the velocity of an object is changing.

There are different types of acceleration:

Positive acceleration refers to an increase in velocity, for example, when an object speeds up.

Negative acceleration or deceleration refers to a decrease in velocity, for example, when an object slows down.

Constant acceleration refers to when the rate of change of velocity is constant, for example, when an object is falling freely under the influence of gravity.

Zero acceleration refers to when an object is moving at a constant velocity, for example, when an object is moving in a straight line at a constant speed.

To calculate the final speed of a car that can accelerate at 7.5 mi/hr/s, we can use the equation:

final speed = initial speed + acceleration x time

In this case, the initial speed is 50 mi/hr, the acceleration is 7.5 mi/hr/s, and the time is 5.0 seconds.

So, the final speed would be:

50 mi/hr + (7.5 mi/hr/s x 5.0 s) = 50 mi/hr + 37.5 mi/hr = 87.5 mi/hr

Therefore, the final speed of the car after 5.0 seconds would be 87.5 mi/hr.

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Answer:

False.

Compounds can have a charge. A compound is a substance made up of two or more elements that are chemically bonded together. The charge on a compound depends on the number of electrons in the outermost energy level, or valence electrons, of the atoms that make up the compound. If the compound has an equal number of protons and electrons, it will have no charge, and is called a neutral compound.

However, if there is an unequal number of protons and electrons, the compound will have a charge and is called an ionic compound. For example, the compound sodium chloride, NaCl, is made up of positively charged sodium ions and negatively charged chloride ions, and therefore has an overall charge of neutral.

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Explanation:

Cyclohexane ends with an -ane, which means that we have an alkane. An alkane consists of carbons and hydrogens with only single bonds. Hex means six, so there are six carbons. Cyclo means we have a ring, which is the six carbons each with two hydrogens, all single bonds.

Each carbon atom can form bonds with two hydrogens because carbon can form four bonds, which are from the two carbons and two hydrogens.

Maltose is a disaccharide formed by the formation of alpha 1,4glycosidic bond between glucose and alpha D glucose unit

A disaccharide is a type of carbohydrate that is created by combining two units of glucose. Succrose, maltose, and lactose are the three most prevalent kinds of disaccharide. The other disaccharides are lactulose, trehalose, and cellobiose, which are less well-known. Dehydration reactions are those that occur when one water molecule is eliminated by combining two monosaccharides, resulting in the formation of a molecule of a disaccharide.

Two alpha D glucose units make up the disaccharide maltose, usually referred to as malt. An alpha 1,4 glycosidic linkage connects the two glucose units. The enzymes maltase and isomaltase break down the molecules of maltose into two glucose molecules in the human small intestine mucosa, which are then absorbed by the body. After cellulose, starch is the carbohydrate that is most prevalent in plant cells.

Formula --C12H22O11

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Beryllium with 2 valence electrons would be able to pair with Se with 6 valence electrons. Option D.

Atoms form bonds with one another based on the number of valence electrons present in their outermost shell. Electrons are either donated, received, or paired.

In order for bonds to form, the participating atoms try to assume an octet structure, In other words, each atom tries to have a completely filled outermost shell. Thus, atoms with only a few electrons in their outermost shells readily donate them while those with just a few electrons remaining to fill up their outermost shell readily accept them.

Be has 2 outermost electrons, Se has 6. Be will readily donate the 2 outermost electrons while Se will readily accept 2 electrons for completely filled shell.

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Answer: Calcium phosphate (Ca3(PO4)2) and phosphoric acid (H3PO4) are two different compounds.

Explanation: In order to determine how many grams of phosphoric acid are formed from 36.4 grams of calcium phosphate, we would need to know the reaction taking place and the stoichiometry of that reaction. Without that information, it is impossible to determine how many grams of phosphoric acid are formed.

Answer:

calcium phosphate (ca3(po4)2) and phosphoric acid(h3po4)

The percent composition by mass of aluminum in al2(so4)3 (gram formula mass = 342 grams) is 15.8%.

Aluminum sulphate is an ionic compound, a combination of both positive and negative ions. Ions are charged atom, which may either be monatomic ions (single atoms) or polyatomic (multiple atoms combined to form a charged part). Aluminum forms a + 3 ion, Al+3, and sulphate is the -2 polyatomic ion, (SO4)-2

So there are two aluminum atoms, three sulfur atoms, and 12 oxygen atoms in a single unit of the compound Al2(SO4)3. This sums to 17. Therefore, there are 17 atoms in a single unit of the compound Al2(SO4)3. The formula for aluminum sulfate is Al2(SO4)3. Then, in a formula unit of Al2(SO4)3 there are two aluminum ions and three sulfate ions; or two aluminum, three sulfur, and twelve oxygen atoms.

Total amu of this compound = 342

Therefore, percent composition of Aluminum = 54/342 x100 = 15.8%

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Neil Bohr's model of an atom as a central nucleus which contain protons and neutrons with the orbits in an circular orbit  at specific distances and the electrons in an atom are arranged in shells that surrounds the nucleus.

Bohr model of the atom was proposed by Neil Bohr in 1915. It came into existence with the modification of Rutherford’s model of an atom. Rutherford’s model introduced the nuclear model of an atom, in which he explained that a nucleus which is (positively charged) surrounded by the negatively charged electrons. Electrons in an atom are arranged in shells which surround the nucleus, with each successive shell being farther away from the nucleus. Subshells consist of one or more atomic orbitals and electron shells consist of one or more subshells.

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Answer:

She is using magnetic force

Explanation:

The minimum number of grams of propane for the given question is calculated as 55.39 g.

Propane is a three-carbon alkane with molecular formula of C₃H₈. It is a gas at a standard temperature and pressure but is compressible to a transportable liquid.

Given, mass of ice = mass of water = 4.10 kg = 4100 g

and temperature of ice = -16 °C ; Temperature of water = 75.5 °C

Heat required to change  ice to water under the specified conditions is:-

As we know, q = q(-16 C to 0°C) + q(fusion) + q (0 C to 75.5 °C)

So q  = m*c(ice)*ΔT(ice) + m*ΔHfusion + m*c(water)*ΔT(water)

 = 4100[2.03(0-(-16)) + 334 + 4.18(75.5-0)]

q = 2796 kJ

As the enthalpy change for combustion of propane is -2220 kJ/mol

Therefore, now the number of moles of propane corresponding to required energy of 2796 kJ ;

= 1 mole * 2796 kJ/2220 kJ

= 1.259 moles of propane

As we know molar mass of propane = 44 g/mol

So, mass of propane required = 1.259 moles * 44 g/mol

Hence we get, mass of propane required  = 55.39 g

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Stoichiometry and the mole concept state that a reaction between 1 x 1010 molecules and extra hydrogen produced 2 x 1010 molecules of ammonia.

A chemical reaction's stoichiometry involves figuring out the ratios of its constituent elements or molecules. The underlying laws of the associated relationships are the law of mass preservation and the law on combining weights & volumes.

To determine the amounts of different compounds contained in the sample, stoichiometry is employed in quantitative analysis.

The balance of chemical equations requires it.

In the example provided, since 1 molecule of nitrogen creates 2 molecules of ammonia, 2 x 1010 molecules o ammonia will be created when 2 x 10101/2=1 molecule.

As a result, 1 x 1010 molecules formed 2 x 1010 molecules of ammonia when they were combined with extra hydrogen.

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The partial pressure of helium (PHe) in this gas mixture is 72.3 kPa.

To find the partial pressure of helium (PHe) in a gas mixture containing oxygen, nitrogen, and helium, you can use the equation:

Total Pressure (PT) = PO2 + PN2 + PHe

Given that the total pressure of the mixture is 189.9 kPa, and the partial pressures of oxygen and nitrogen are given as 104.6 kPa and 13.0 kPa, respectively, you can use these values to solve for PHe.

PT = PO2 + PN2 + PHe

189.9 kPa = 104.6 kPa + 13.0 kPa + PHe

Solving for PHe:

PHe = PT - PO2 - PN2

PHe = 189.9 kPa - 104.6 kPa - 13.0 kPa

PHe = 72.3 kPa

So, the partial pressure of helium (PHe) in this gas mixture is 72.3 kPa.

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Answer:

Salt and water is produced.

For example:-

NaOH(base)+HCl(Acid)=>NaCl(salt)+H20(water)

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Therefore, since the density of the samples are closer to the density of pyrite (5.01 g/cm³) we conclude that the samples are more like to be pyrite.

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6.02 x10^23 carbon atoms have a mass of 12.04 grams.

An element's atomic mass is the average mass of its atoms measured in atomic mass units (amu, also known as daltons, D). The atomic mass is a weighted average of all the isotopes of that element, calculated by multiplying the mass of each isotope by its abundance.

The atomic mass of carbon is 12.0107 grams/mol. Since 1 mole of carbon atoms is equal to 6.02 x 10^23 atoms, the mass of 6.02 x 10^23 atoms can be calculated by multiplying the atomic mass of carbon by 6.02 x 10^23. 12.0107 grams/mol x 6.02 x 10^23 = 12.04 grams. This is the mass of 6.02 x 10^23 carbon atoms.

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The H+ ions separate from the aspirin at pH higher than pKa and then become deprotanated-ve charge.

[tex]pH=pK\alpha +[/tex]㏒[tex]\frac{A-}{HA}[/tex]

㏒[tex]\frac{A-}{HA} =pH-pK\alpha[/tex]

㏒[tex][\frac{A-}{HA} ][/tex]=1.5-3.5

[tex][\frac{A-}{HA} ]=10^{-2}[/tex]

[tex][\frac{A-}{HA}]=\frac{1}{100}[/tex]

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The acid in aspirin, acetylsalicylic acid, is very weak. Because of this, it must be more in unnionized form in the stomach's acidic pH. It must be more ionized for the intestine's alkaline pH.

For the same pH range, the small intestine absorbs more nutrients than the stomach. The intestinal absorption of aspirin is greater than the stomach absorption of the drug at pH 3.5 or 6.5.

The base-10 negative logarithm pKa serves as the acid dissociation constant (Ka) of a solution. One way to gauge an acid's potency is by looking at its pKa value. A stronger acid is indicated by a lower pKa value. A lower value, for instance, signifies that the acid dissociates completely in water.

[tex]pH = pKa + log\frac{A-}{HA}[/tex]

[tex]log\frac{A-}{HA} = pH - pKa[/tex]

[tex]log\frac{A-}{HA} = 1.5 - 3.5[/tex]

[tex][\frac{A-}{HA}] = 10^{-2}[/tex]

[tex][\frac{A-}{HA}] = \frac{1}{100}[/tex]

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Quantity of heat released = -63.1 kJ

Given:

Enthalpy of vaporization of water, ΔHvap = 40.7 kJ/mol

Mass of water, m = 27.9 g

To determine:

The amount of heat (Q) released

The reaction is: H2O(g) ↔ H2O(l)

The amount of heat evolved during condensation which involves a phase transition from vapor to liquid is given as:

Q=n*Delta H vape

n = moles of water

Since this is a condensation process: ΔHcond = -ΔHvap

Q=27.9g/18g mol * -40.7 k j/mol=63.1 k j

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Thompson's model concluded that the atom contained something small and negative. The correct option to this question is C.

Thomson's description of the atomic model is one of many scientific models of the atom. Created by J.J. Thomson in 1904, shortly after the electron was discovered. However, the atomic nucleus had not yet been discovered at that time. So he proposed a model based on the known properties available at the time. Known properties are:

Atoms are neutrally charged

Inside an atom are negatively charged particles called electrons. According to the assumptions of Thomson's atomic model, an atom resembles a positively charged sphere with electrons (negatively charged particles) inside.

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The highest zeff , effective nuclear charge for its valence electron from the give option is the F with the value of 5.2.

The Zeff can be calculated by the following formula :

Zeff = Z - s

where ,

Z is the atomic number

s is the shielding effect

F = 9 - (0.35 × 6 + 0.85 × 2 )

F = 5.2 for its valence electrons.

Li = 3 - 1.7

    = 1.3

O = 8 - ( 2 × 0.85 + 5 × 0.35 )

   = 4.5

C = 6 - (2 × 0.85 + 3 × 0.35)

   = 3.25

Na = 11 - ( 2 × 1 ) + (  8 × 0.85 )

Na = 2.20

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Option - C : Steam is the physical states of water contains particles with the highest kinetic energy. Because water in a gaseous form, has its particles moving around the most. Therefore, having the highest kinetic energy .

Kinetic energy is the energy that a moving item possesses. An item can only be accelerated through the application of a force. Applying force requires effort on our part. Following completion of the work, energy is transferred to the object, which then moves at a new, constant speed. Kinetic energy is the force that drives motion, and it may be observed in the motion of objects and subatomic particles. Every particle and moving object contains kinetic energy. Walking, a baseball flying through the air, food falling from a table, and a charged particle in an electric field are some examples of kinetic energy in action. The power is the energy , an object in motion possesses.

The word "kinetic" derives from the Greek "kinesis," which means motion.

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