the weak base ionization constant (ka) for h2c2o4 is equal to what?

Answer:

Chemical symbols refer to chemical elements only. They do not necessarily refer to atoms of that element, but also to ions.

Explanation:

Answer:

The Cell Wall

Explanation:

Answer:

Clear quartz-

Jasper-

Amethyst-

Explanation:

Rock Salt The elements in rock salt are not integrated into the salt's crystal grid, but cling to the outside surface and crevices of the crystalline structure. This is the fundamental difference between rock salt and crystal salt. A salt crystal manifests a superior structure.

Answer:

Explanation: Liquid Chromatography  

I'm sorry if i'm wrong

The process that brings rocks and minerals containing phosphorus to the surface so it can be released for use by living things is called uplift.

A rock is defined as a solid or hard material that is made up of different minerals and they are of three main types such as igneous rock, sedimentary rock and metamorphic rocks.

The minerals that are found in rocks include the following:

quartz,

feldspar,

mica,

amphibole,

phosphorus

olivine, and calcite.

When these minerals are being transported to the surface of the earth to be used by plants and animals it is called uplift.

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Answer:

dinitrogen pentachloride

Answer:

Required heat = 15,716.8 joules

Explanation:

Given:

Mass of ice = 47 grams

Find:

Required heat

Computation:

Required heat = Mass x latent heat of ice

Required heat = 47 x 80 caloric per gram degree

1 calories = 4.18 (Approx)

Required heat = 47 x 80 x 4.18 joules

Required heat = 15,716.8 joules

Answer:

D - Thermodynamics

Explanation:  I just took the quiz

Answer:

\(T_f=72.5\°C\)

Explanation:

Hello!

In this case, since this a problem in which the cold water is heated by the hot water, we can write:

\(Q_{hot}+Q_{cold}=0\)

Thus, by plugging in the mass, specific heat and temperatures, we obtain:

\(m_{hot}C_{hot}(T_f-T_{hot})+m_{cold}C_{cold}(T_f-T_{cold})=0\)

Now, we can also write:

\(m_{hot}(T_f-T_{hot})+m_{cold}(T_f-T_{cold})=0\)

Then, after applying some algebra, it is possible to obtain:

\(T_f=\frac{m_{hot}T_{hot}+m_{cold}T_{cold}}{m_{hot}+m_{cold}}\)

If we plug in, we obtain:

\(T_f=\frac{350.0g*95.0\°C+150.0g*20.0\°C}{350.0g+150.0g}\)

\(T_f=72.5\°C\)

Best regards!

Answer:

the weakest base will have a higher Kb value since it will be closer to an acid than a base

7 kb values represents the weakest base.

Kb is the base dissociation constant which is a measure of how completely a base dissociates into its component ions in water. pKb is define as the negative base-10 logarithm of the base dissociation constant (Kb) of a solution.

Ka is define as the acid dissociation constant while pKa is the -log of this constant. Kb is define as the base dissociation constant, while pKb is the -log of the constant.

The acid and base dissociation constants are usually expressed in terms of moles per liter (mol/L).

Thus, 7 kb values represents the weakest base.

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According to the claim, Balloon A, which has more blue and less orange, exhibits accurate effusion at a relative effusion rate of 1.303. (orange is 1.303 times more effused than blue).Relative rate of effusion for the orange to blue spheres = 1.531.

The process of effusion is when a gas escapes from a container through a hole that is significantly smaller in diameter than the molecules' mean free path.

Gas molecules flow through a small opening in one container and into another by effusion. Graham's law allows rates of effusion to be compared at the same temperature. Diffusion is the random molecular motion-based movement of gas molecules through one or more other types of gas.

Rate of effusion of Orange / Rate of effusion of blue

= [Mblue / Morange]^1/2

Vrms = sqrt [(3RT/M)]

Vorange / Vblue = [ Mblue / Morange]^1/2

Rate of effusion of Orange / Rate of effusion of blue

= 565/ 369

= 1.531

Thus,  Balloon A, which has more blue and less orange, exhibits accurate effusion at a relative effusion rate of 1.303.

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Answer:Ok den...

Explanation:

Nope

Heat = mass * specific heat. According to the definition, a material's specific heat capacity is normally calculated by measuring the heat capacity of a sample of the substance.

Heat capacity = mass* specific heat.

                   = 15 g * ( 100 c)

                   = 1500 g c.

When a substance, especially a gas, is heated while being allowed to expand (specific heat capacity at constant pressure) as opposed to being heated in a closed vessel that forbids expansion.

Its specific heat capacity may be much larger (specific heat capacity at constant volume). 

Therefore, Heat = mass * specific heat. According to the definition, a material's specific heat capacity is normally calculated by measuring the heat capacity of a sample of the substance.

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Answer:

limiting reagent is 02

mass of CO2 is 11g

Explanation:

the limiting reagent is the reagent which is consumed completely

no of mole of CH2 = m in g / molar mass

= 46.0/(12+2)

= 3.285 moles.

no of mole of O2 = 32/32

= 1 mole

from the reaction

1 mole of CH2 ==> 2 mol of O2

3.285 mol ==> 1/2 mol

3.285 mol ==> 0.5 mol

:. since O2 has the lowest mol , it's the limiting reagent

the limiting reagent mol will be used to find the no of mole of CH2

2 mol of O2==> 1 mol of CO2

0.5 mol ==> 0.5/2

0.25 mole of CO2

mass = 0.25 * ( 12+32)

= 11g

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The amount of carbondioxide that will be produced if 1.3L is combusted is 3.9L (option B).

Stoichiometry refers to the study and calculation of quantitative (measurable) relationships of the reactants and products in chemical reactions (chemical equations).

According to this question, propane gets combusted in air to produce carbondioxide and water as follows:

C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

Based on the above equation, 1 mole of propane produces 3 moles of carbondioxide.

This suggests that 1.3L of propane will produce 3.9L of carbondioxide.

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(a) shows both acidic and basic properties

(b) creates a neutral pH in solution

(c) is an ionic compound formed from an acid-base reaction

(d) can react with acid but not with a base

Answer:

B. the number of protons added to the number of neutrons in the nucleus.

Explanation:

Sana makatulong

Acetone has a concentration of 0.74 Mm.

Acetone is an organic chemical that is colorless, combustible, volatile, and has a distinctively strong odor. It is a solvent that is frequently used in a variety of commercial and domestic settings. It also serves as a starting point for the synthesis of other chemicals. Acetone has the chemical formula CH3COCH3 and a molecular weight of 58.08 g/mol.

We must first determine how many moles of acetone are present in the solution.

Per kilogram of solvent, one molal equals one mole of solute.

Since 1 kilogram is equivalent to 1000 milliliters of ethanol, it is possible to compute the number of moles of acetone as follows:

1000 mL/kg times 1.00 mol/kg is 1.00 mol.

The mass of acetone in the solution can then be determined using the molar mass of acetone (58.08 g/mol):

1 mole * 58.08 g/mol = 58.08 g

The volume of acetone can then be calculated by dividing the mass by the density:

58.08 g/0.788 g/mL equals 73.56 mL.

Finally, the molality of acetone can be determined as follows:

0.0074 mol/L (1.00 mol)/1.00 mol/(73.56 mL + 1000 mL) = 0.74 mM.

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Madam CJ Walker invented the world’s first hair-straightening formula and the hot comb.

Madam CJ Walker was an American African woman. She was also a political figure and an entrepreneur. She was a social activist. She died at the age of 51.

Madam CJ Walker invented the first-ever hair straightening products and combs. She also invented beauty products. Besides it, she motivates other women to be an entrepreneur and educated.

Therefore, the heated comb and the first hair-straightening formula in history were created by Madam CJ Walker.

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In a first order reaction,  plot of the logarithm of the concentration of reactants against the time gives a straight line graph.

The question is incomplete but I will try to help you as much as a I can. A first order reaction is one in which the rate of reaction depends on the concentration of only one reactant.

A plot of the logarithm of the concentration of reactants against the time gives a straight line graph.

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I would have to say the answer is smokeless fuels

The smaller pieces are less dense than the larger piece that remains.

The density of a substance is calculated as follows;

\(\rho = \frac{m}{V}\)

where;

Since the pore volume of the rocks are the same, their densities is compared as follows;

\(\rho _1 = \frac{m_1}{V} \\\\\rho_2 = \frac{2m_1}{V} \\\\\rho _2 = 2 (\frac{m_1}{V})\\\\\rho_2= 2\rho _1\)

Thus, density depends on mass and the smaller pieces are less dense than the larger piece that remains.

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Answer:

Explanation:

For a certain metal M by which the electrodes and the solution M_2SO_4 the cell notation is:

                                    SALT BRIDGE

     ANODE                         ↓                    CATHODE

\(M(s)|M_2SO_4_{(aq)} (50.0 \ mM)\Big {|} \Big {|} M_2SO_4_{(aq)} (5.00 \ M ) |M(s)\)

Since the standard electrode potential is less positive on the left side, a negative anode electrode is used, and oxidation occurs at the anode.

\(i.e \ \ M(s) \to M^{2+} _{(aq)} + 2 e^- \ \ \ (oxidation)\)

The right side of the cell cathode is placed which is positive in sign and aids in reduction since the normal reduction potential is less negative.

\(i.e \ \ M^{2+} _{(aq)} + 2 e^- \to M(s) \ \ \ (reduction)\)

As a result, the correct answer for the positive electrode is the right side.

\(M_2SO_4 \to M^{2+} + SO_4^{2-}\)

Using Nernst Equation:

\(E_{cell} = - \dfrac{RT}{nF }log ( \dfrac{reduction \ half }{oxidation \ half})\)

\(E_{cell} = - \dfrac{2.303 \times 8.314 \times 293}{2 \times 96485 }log ( \dfrac{5.0 0 }{50 \times 10^{-3}})\)

\(E_{cell} = -0.058 \ V\)

The distance from base to another is 127 feet or 3 3/8 inches.

Base paths/distance

The dimensions of infield shall be a 90-foot square. When the location of home base is determined, with a steel tape the dimensions are found to be  of 127 feet, 3 3/8 inches in desired direction to establish second base. The distance between first base and third base of the home is 127 feet, 3 3/8 inches.

An intentional walk occurs when the defending team chooses to walk a batter on purpose, putting him on first base instead of letting him try to hit.

Hence, distance from one base to another is 127 feet or 3 3/8 inches.

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1. The number of mole of C₃H₈ needed to make 15.5 moles of CO₂ is 5.2 moles

2. The number of moles of O₂ needed is 25.8 moles

The number of mole of C₃H₈ needed can be obtained as illustrasted below:

C₃H₈ + 5O₂ -> 3CO₂ + 4H₂O

From the balanced equation above,

3 moles of CO₂ was obtained from 1 mole of C₃H₈

Therefore,

15.5 moles of CO₂ will be obtain from = (15.5 × 1) / 3 = 5.2 moles of C₃H₈

Thus, number of mole of C₃H₈ needed is 5.2 moles

We can obtain the number of mole of O₂ needed as follow:

C₃H₈ + 5O₂ -> 3CO₂ + 4H₂O

From the balanced equation above,

3 moles of CO₂ was obtained from 5 moles of O₂

Therefore,

15.5 moles of CO₂ will be obtain from = (15.5 × 5) / 3 = 25.8 moles of O₂

Thus, number of mole of O₂ needed is 25.8 moles

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Complete question:

How many moles of C₃H₈ are needed to make

15.5 moles of CO₂? How much O₂ will be needed?

C₃H₈ + 5O₂ -> 3CO₂ + 4H₂O