Question 22 of 29 Which of the following reactions is an acid-base reaction? A) AgNO3(aq) + KF(aq) →→ AgF(s) + KNO3(aq) B) NH3(aq) + HF(aq) → NH4*(aq) + F(aq) C) NO₂ (aq) + Al(s) → NH3(g) + AIO₂ (aq) D) CH4(g) + 2O₂(g) → 2H₂O(g) + CO₂(g)​

Answer:

B

Explanation:

Answer

To solve this excescise we use the ideal gas equation:

Where:

P is the pressure of the gas

V is the volume

T is the temperature

R is the ideal gas constant

n is the number of moles

As the balloon is a closed recipient n is the same in state 1 (T: 24°C) and state 2 (T: 48°C).

R is a constant so also remains the same.

The pressure is also a constant in this case as the only thing that we do to the balloon is heat it.

So therefore:

Now we calculate the volume at 48°C (V2):

As we can see as the temperature rises the volume of the gas increases because the molecules have more kinetic energt and they remain farther apart.

The answer then is the new volume of the balloon is 2.4L

Explanation:

Because during the phase transformation the pressure inside the closed container remains the same and that's a fact ay

The pH of the 1.63 M solution of methylamine is 10.56.

The pH of the 1.63 M solution of methylamine is calculated from the equation of the dissociation reaction  as follows:

H₃CNH₂ (aq) + H₂O (l) ---> H₃CNH₃ (aq) + OH⁻ (aq)

pKb of H₃CNH₂ = 3.66

Kb of H₃CNH₂ = 10⁻³°⁶⁶ = 2.19 * 10⁻⁴

The [OH¯] is calculated using the Kb expression:

Kb = [OH⁻] * [H⁺] / [HA}

[OH⁻] = [H⁺] = x

Kb = x² / (1.63 - x)

Assuming is x <<< 1.63, x is negligible and the denominator = 1.63

x = √(2.19 * 10⁻⁴ x 10⁻¹¹ * 1.63)

x = 3.57 * 10⁻⁴

pOH = -log (3.57 * 10⁻⁴)

pOH = 3.44

pH = 14 - 3.44

pH = 10.56

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The order of the liquids will depend on the density of each of them. The densest will go to the bottom of the container, the least dense will be on top.

Let's see what the density of each of the substances is, let's assume that we are at room temperature.

Ice density = 0.917g/cm^3

Corn oil density =0.925g/cm^3

Ethanol density = 0.789g/cm^3

The order of density from lowest to highest is:

Ethanol < Ice < Corn oil

This will be the order from top to bottom, so the answer will be:

B. ethanol, ice, corn oil C

The electron affinity of the given elements in question is Cl>S>Co>K>He, in the order of highest to lowest.

What is electron affinity?

When an electron is added to a neutral atom to create a negative ion, the energy of the atom changes (in kJ/mole). This is how electron affinity is defined. Or, the probability that a neutral atom will capture an electron.

The electron affinity decreases when we go left to right in the periodic table. But, there is a exception that the nobel gases has extremely low electron affinity. Among the given elements He is nobel gas so it has very low electron affinity and for the other elements we will check which element is located in left most position in periodic table that element has the highest electron affinity.

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Step-by-step explanation:

Assuming a basis of 100 grams

composition of Potassium = 44.2%

composition of potassium = 0.442

mass of potassium = 0.442 x 100g

Mass of potassium= 44.2 grams

mole of potassium = reacting mass / molar mass

Molar mass of potassium = 39.1 gram/ mol

Mole of potassium = 44.2 / 39.1

Mole of potassium = 1.13 moles

mole of potassium chloride + mole of potassium nitrate = mole of potassium

n(KCL) + n(KNO3) = n(k)

since mole (n) = m/M.M

Then we have,

m(KCL)/M.M(KCL) + m(KNO3)/M.M (KNO3) = 1.13

M.M (KCL) = 39.1 + 35.5

M.M (KCL) = 74.6 gram/mol

M.M (KNO3) = 39.1 + 14 + 3(16)

M.M (KNO3) = 39.1 + 14 + 48

M.M (KNO3) = 101.1 gram/mol

Let the mass of KCL be x

Let the mass of KNO3 be y

Assuming the total mass of the mixture is 100g

x + y = 100 ---------- equation 1

x/74.6 + y/101.1 = 1.13 ---- equation 2

From the first equation, make x the subject of the formula

x = 100 - y

100- y / 74.6 + y/101.1 = 1.1.3

1.355(100 - y) + y = 1.13 * 101.1

135.52 - 1.355y + y = 114.243

Collect the like terms

-1.355y - y = 114.243 - 135.52

-0.355y = -21.277

Divide both sides by -0.355

-0.355y/-0.355 = -21.277/-0.355

y = 59.9grams

y is 60 grams approximately

Recall, y is the mass of KNO3

From the first equation

x + y = 100

The wavelength of the x-rays is 1.094 * 10⁻⁵ pm.

The frequency of a wave is the number of complete oscillations completed by the wave per second. Its unit is Hertz.

The wavelength of a wave is the distance between successive points in phase in the wave. It is measured in units of meter.

The relationship between the wavelength and frequency of a wave is given below.

Wavelength = velocity of the wave / frequency

The frequency of X-rays = 3.0 * 10⁸ m/s

frequency of the wave =  2.74 × 10¹⁹ Hz

Wavelength = (3.0 * 10⁸ m/s) / (2.74 × 10¹⁹ Hz)

wavelength = 1.094 * 10⁻¹¹ m

wavelength = 1.094 * 10⁻⁵ pm.

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You are in charge of a plant that makes methyl bromide,CH₃Br this compound is used as a fumigant for nematodes the thermochemical equation for the reaction is: CH₃OH(aq) + Br⁻(aq) equilibrium reaction arrow CH₃Br(aq) + OH⁻(aq) ΔH = +78 kJ/mol you must maximize the yield of the product when run the reaction with excess CH₃OH

Thermochemical is the reaction in which energy and heat associated with chemical reaction or physical transformation

The yield is maximum because the reactant will allow more and more to build up the reaction and here given reaction is

CH₃OH(aq) + Br⁻(aq)

In which when run the reaction with excess CH₃OH then automatically the yield of the reaction is become maximize and in the reaction the reactant run in excess amount automatically the yield as well as the product are become more

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Answer:  dinophyte

Explanation: its a type of protist. it is unicellular and has chloroplasts

Scientists discover a species that is unicellular and has chloroplasts.  It could be a dinophyte.

A single-celled eukaryotic group (Protists) called a dinophyte makes up the phylum Dinoflagellates. They possess chloroplasts and are single-celled.

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The amount of heat energy needed to increase a substance's temperature by 1°C per unit mass is known as its specific heat capacity (or 1K). joule per kilogram per kelvin is the SI unit (Jkg-1K-1).

so,

805,560 Joules heat energy is needed to raise the temperature  from 23 °C to 191 °C.

Use the formula:

Q = cMΔT

where

Q = heat energy needed for that material to get desired temperature change (in Joules)

M = mass (in grams) so you have to convert from kilograms.

c = specific heat constant for the material being heated [in /(grams oC)]

ΔT = change in temperature (in oC)

Q = (1.75)(2.74 x 1000)(191 - 23) = (1.75)(2740)(168) = 805,560 Joules

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Q = cMΔT

where

Q is the amount of heat energy required to change the material's temperature.

You must convert from kilograms since M is mass (in grams).

c = the material's specific heat constant [in grams per degree Celsius]

T stands for temperature change (in oC)

Q is equal to (1.75 x 2.17 x 1000) (191 - 23) = (1.75 x 2170 x 168) = 637,980 Joules.

What does "specific heat capacity" mean?

In thermodynamics, a substance's specific heat capacity, commonly referred to as massic heat capacity, is calculated by dividing its heat capacity by its mass in a sample.

particular heat capacity's mathematical formula?

Delta T = Q=mc

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We have this reaction:

C + O2 ===> CO2

The compounds on the left of the arrow are the reactants, the ones on the right are called products.

Answer: Carbon and Oxygen are reactants

Answer:

about 2 g/cm

Explanation:

D = M/V

D = 44.3/22.1

D ≈ 2

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ANSWER

The amount of valence electron in an atom is equivalent to the group the atom is located

EXPLANATION

Valency is define as the combining power of an element. Valence electrons are electrons located at the outer most shell of an element.

Valence electrons tell us the group a particular element belongs to and also the chemical properties of the element.

For example, sodium atom

Sodium has the below electronic configuration

The structure above represents a sodium atom. The structure contains a single electron at the outer most shell of the atom. The single electron is called the valence electron of sodium. Hence, sodium belongs to group 1

Therefore, the amount of valence electron in an atom is equivalent to the group the atom is located

The incorrect name-formula combination is FeCIO₄ -  Iron(I) perchlorate; option B.

The IUPAC nomenclature of naming compounds refers to the convention of naming compounds using the oxidation states of the elements present in the compound.

The IUPAC nomenclature of the given compounds is given below as follows:

A. Co(CIO₂)₂ - Cobalt(II) chlorite; the oxidation state of cobalt is +2

B. FeCIO₄ -  Iron(I) perchlorate; the formula of the compound is wrong because iron does not exist in the +1 state

C)Mn(CIO4)₂ -  Manganese(II) perchlorate;  the oxidation state of manganes is +2

D) Cr(CIO)₃​ - Chromium(III) hypochlorite ;  the oxidation state of chromium is +3

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Because amount has no effect on mass percentages, the mass percentage of carbon in 5, 50, and 500 g of sucrose is 42.1  %

The mass:
It also represents the body's inertia, or resistance to acceleration (change in velocity) when a net force is applied. The mass of an object dictates the strength of its gravitational attraction to other bodies.

The kilogram is the SI base unit of mass (kg). Mass is not the same as weight in physics, despite the fact that mass is frequently calculated by measuring the object's weight using a spring scale rather than a balance scale and comparing it directly with known masses. Because of the reduced gravity, an object on the Moon would weigh less than it does on Earth, yet it would still have the same mass.

Molecular formula of sucrose is C12 H22 O11

Molar mass of Sucrose , C12 H22 O11 is = ( 12 x 12 ) + ( 22 x 1 ) + ( 11 x 16 )   g/mol

                                                                = 342 g/mol

The molar mass of Carbon is 12 g/mol

342 g of C12 H22 O11  contains 12 x 12 g of C

5 g of C12 H22 O11  contains Y g of C

Y = ( 12x12x 5 ) / 342

  = 2.105  g of  C

mass % of C = (mass of C / mass of sucrose ) x 100

                    = (2.105 / 5 ) x 100

                    = 42.1  %

342 g of C12 H22 O11  contains 12 x 12 g of C

50.0 g of C12 H22 O11  contains Y g of C

Y = ( 12x12x 50 ) / 342

  = 21.05  g of  C

mass % of C = (mass of C / mass of sucrose ) x 100

                    = (21.05 / 50 ) x 100

                    = 42.1  %

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ANSWER

The mass of glucose in grams is 230 grams

EXPLANATION

Given information

The total volume of the solution = 1.5L

Follow the steps below to find the mass of glucose

Step 1: Convert the volume of the solution from L to mL

According to the standard conversion, 1L is equivalent to 1000mL

Let x represents the volume of the solution in mL

Hence, the volume of the solution in mL is 1500mL

Step 2: Find the mass of the glucose in grams

Hence, the mass of glucose in grams is 229.5 grams

Answer:  The correct answer is C. Zn

Explanation:  Zn in its native state has bonds between multiple cations and a sea of valance electrons.

Armondo could test how curves in a river affect the speed of the river as the speed of the water outside of a bend increases as a river rounds the bend. The water's velocity, however, diminishes as it approaches the interior of the curve.

A fantastic illustration of how water can alter the contour of the land is a meandering river. A river seldom turns when it is bordered by sheer rock, but it will do so when it opens up in broad valleys. Water will flow more swiftly and destroy the ground faster outside the river. Over time, it will curve too much and slow down.

To simulate a meandering river, use a stream table. The speed of the water outside of a bend increases as a river rounds the bend. The water's velocity, however, diminishes as it approaches the interior of the curve. A bar of deposited silt, like this one, is created as a result of the reduction in velocity.

The velocity of a river is the rate at which water flows through its course. Numerous elements, such as the channel's form, the slope's grade, the amount of water carried by the river, and the amount of friction brought on by jagged edges in the riverbed, all affect a river's speed.

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Answer:D

Explanation:

The equilibrium partial pressure of D is 0.362atm.

2A(g) + B(s) <==> 2C(s) + D(g)

The pressure that a gas, in a mixture of gases, would exert if it alone occupied the whole volume occupied by the mixture is called partial pressure of the gas.

In the equilibrium expression, we ignore solids as they are considered to have a value of unity. Thus, we can write the equilibrium expression for the above reaction as:

K = (PD) / (PA)²

where, K = Partial pressure equilibrium

           PD = Partial pressure of gas D

           PA = Partial pressure of gas A

Kp = 8210

PA = 0.021 atm

8210 = PD / (0.021)²

PD = 8210 × (0.021)²

PD = 0.362 atm.

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According to this question, a graduated cylinder contains 25.8 mL of water. 2 glass marbles weighing 6.5 g was dropped into the cylinder. The new water level reads 27.2 mL.

This means that the volume of the marbles can be calculated as follows:

27.2mL - 25.8mL = 1.4mL

The volume of the marbles is 1.4mL.

Density is a measure of the mass of matter contained by a unit volume. The density can be calculated by dividing the mass by the volume as follows:

Density = 6.5g ÷ 1.4mL = 4.64g/mL

The density of the marble is 4.64g/mL.

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1)

Na3PO4 + H2SO4 => Na2SO4 + H3PO4

We must have the same number of atoms on both sides.

We start with Na,

2 Na3PO4 + H2SO4 =>3 Na2SO4 + H3PO4 (6 Na on both sides)

Then we proceed with P,

2 Na3PO4 + H2SO4 =>3 Na2SO4 +2 H3PO4 (2 P on both sides)

After that, we continue with S,

2 Na3PO4 + 3 H2SO4 =>3 Na2SO4 +2 H3PO4 (3 S)

The number of H and O are solved.

Answer: 2 Na3PO4 + 3 H2SO4 =>3 Na2SO4 +2 H3PO4

Since the number is 5.8*10^-3 g, the negative symbol in front of the power of 3 means that there are 3 0's in front of the real number, in standard notation, therefore we will add these 3 zeros to the number

0.0058 grams, and if we multiply it by 1000 we will end up with 5.8 mg, letter C

Acidic solution I use: Lemon Juice (Citric acid)

I know this is acidic because it is sour in taste just like all other acids.

Basic solution I use: Handwash

I know this is basic because it is soapy and slippery in nature, and it dissolves oil and grease.

Neutral solution I use: Water

I know this is neutral because it has equal number of H+ and OH- ions.

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The arrangement of the in order of decreasing atomic size is as follows:

The atomic size of an atom is the diameter of the atom and is calculated as half the distance between the nuclei of two covalently-bonded nuclei of the atom.

The atomic size of elements increases down a group but decreases across a period.

The reason for this trend is that, on going down a group, an extra electron shell is added to the element below. However, across a period, the electron shell remains the same whereas the size of the positive nuclear charge increases, therefore, the atomic size of atoms in the same period decreases from left to right across the period.

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Complete question:

Arrange the following elements in order of decreasing atomic size.

Rank the atoms from the largest to smallest. To rank items as equivalent, overlap them: Al, Cl, Ar, P, and K.

The enthalpy of the reaction is -164 kJ/mol.

We know that the reaction that occurs between the chromium metal and the acid is an exothermic reaction thus there is an increase in the temperature of the system.

Number of moles of the silver nitrate solution is obtained from;

Volume * concentration

500/1000 L * 0.915 M = 0.46 moles

We can now assume that the density of the solution is 1 g/mL hence the mass of the solution is 500g. Let the specific heat capacity of the solution be 4.18 J/Kg/°C.

Then;

H = mcdT

H = Heat lost in the reaction

m = mass of the solution

c = specific heat capacity

dT = temperature change

H = 500 * 4.12 * ( 55.9 - 19.3)

= 75.4 kJ

The heat of reaction = 75.4 kJ/0.46 moles

= -164 kJ/mol

Let us recall that the negative simply means that heat was lost in the reaction.

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The force and the product of mass and acceleration, ma , is used to describe the relationship between the mass of object and the amount of force acting to accelerate it.

The newtons second law states that : The force  ( F ) acting on a moving body is the product of mass ( m ) and the acceleration ( a).

the expression is given as :

F = ma

where,

F = net force acting on an object

m = mass of the object

a = acceleration

of the object

we can use this formula in three different ways:

1)  To calculate the force :

F = ma

2) To calculate the mass :

m = F / a

3) To calculate the acceleration :

a = F / m

Thus,  The force and the product of mass and acceleration, ma , is used to describe the relationship between the mass of object and the amount of force acting to accelerate it.

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Answer:

the oxidation number of N in (NH4)2CrO4 is -3. the oxidation number of O in (NH4)2CrO4 is -2. the oxidation number of Cr in (NH4)2CrO4 is +6. the oxidation number of H in (NH4)2CrO4 is +1

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N has an oxidation number of -3, O has an oxidation number of -2, and Cr has an oxidation number of +6 in the compound (NH4)2CrO4.  The H in (NH4)2CrO4 has an oxidation number of 1

Oxidation number is defined as how many electrons a given atom or ion has either gained or lost when compared to a neutral atom. Any free element's oxidation number is always zero. The meaning was expanded to cover additional reactions in which electrons are lost, regardless of whether oxygen was present, since the substance loses electrons when it is oxidized.

In the case of a monatomic ion, the oxidation number is always the same as the ion's charge.  The name of the compound is ammonium chromate which has oxidation number both in positive as well as negative charge electrons.

Thus, N has an oxidation number of -3, O has an oxidation number of -2, and Cr has an oxidation number of +6 in the compound (NH4)2CrO4.  The H in (NH4)2CrO4 has an oxidation number of 1.

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The enthalpy of the reaction is obtained as -430.22 kJ/mol

The enthalpy change refers to the energy that is lost or gained in the reaction. Let us now look at the standard enthalpies of formation of the reactants and the products.

Standard enthalpy of formation of gaseous  water = -241.82 kJ/mol

Standard  enthalpy of formation of gaseous carbon dioxide = -393.5 kJ/mol

Standard  enthalpy of formation of gaseous methanol = -205.10 kJ/mol

Standard  enthalpy of formation of gaseous oxygen = 0 kJ/mol

Hence;

Using the formula;

Enthalpy of formation of the products - Enthalpy of formation of the reactants

ΔH = [(-393.5 ) + (-241.82)] - [(-205.10) + 0]

ΔH = (-635.32) + 205.10

ΔH = -430.22 kJ/mol

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Answer:

no. of moles = 0.0113

Explanation:

To calculate the number of moles of a substance given its concentration and volume, we can use the following formula:

[tex]\boxed{\mathrm{No. \ of \ moles = Concentration \times \frac{Volume}{1000}}}[/tex],

where concentration is mole/dm³ or M, and volume is in cm³ or ml.

In this question, we are told that:

• concentration = 0.250 M

• volume = 45.0 ml

Substituting these values into the formula above, we get:

No. of moles = [tex]0.250 \times \frac{45.0}{1000}[/tex]

                     = [tex]0.250 \times 0.045[/tex]

                     = 0.01125

                     [tex]\approx[/tex] 0.0113   (3 s.f.)

Therefore, the number of moles of C₂H₅OH is 0.0113.

The 0.0112 moles of C2H5OH are present in the 0.250 M solution of C2H5OH.

What is a mole?

Mole is used as a concentration unit in chemistry terms. One mole is equal to the mass of the given compound which is divided by the molar mass of the same compound.

Given:

M= 0.250M ( M stands for molarity)

Volume = 45.0 ml

The molar mass of  C2H5OH = 46.07 g/mol

Now, we use molarity formula M = Moles of the substance/volume in liter

Let say moles = x

Units of M = mol/L

Therefore, units of volume need to be converted in to Liters = 1L = 1000ml

By using molarity equation, X= 45.0*0.250/1000 = 0.0112 moles

Hence, the required number of moles of C2H5OH = 0.0112 moles.

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