0 out of 1 points calculate the poh of a solution that results from mixing 22.2 ml of 0.14 m benzoic acid with 45.5 ml of 0.11 m sodium benzoate. the ka value for c6h5cooh is 6.5 x 10-5.

When an electrolyte dissolves in water, the resulting solution conducts an electric current.

Baking soda neutralizes the acid so D

Baking soda is a weak base and will neutralize the acid.

Explanation:

       \(NaHCO_3+HA\rightarrow NaA+H_2O+CO_2\)

        (Where: HA is the general formula of an acid)

That is why the baking soda is present in the acid spill kits. So from this, we can conclude that the correct answer is option D.

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Answer:

20

Explanation:

Hi there!

We need to find the atomic number of an atom that has 20 protons and 20 neutrons

the atomic number of an atom is equivalent to the amount of protons an atom has, as the number of protons determines what element an atom is.

Since the atom has 20 protons, the atomic number of the said atom is 20

Hope this helps!  

Answer: Zelda should place one container of water in sunlight (by a window or outdoors) and the other container in a dark room (closet) away from the sun.

Explanation: This would allow Zelda to test two different settings (sun and no sun) so she can test her hypothesis.

we have obtained expressions for z1 and z2 in terms of z0, c1, and c2. We can now use these expressions to compute z2 given an arbitrary z0, c1, and c2, z1 = (c1 + z0)/√2 + i(c1 - z0)/√2,  z2 = (c2 + z1)/√2 + i(c2 - z1)/√2.

Let's denote the complex numbers as follows:

c1: the center of the first rotation.

c2: the center of the second rotation.

z0: the initial complex number.

z1: the result of rotating z0 around c1 by π/4 counter-clockwise.

z2: the result of rotating z1 around c2 by π/4 counter-clockwise.

To perform these rotations, we use the following formulas:

To rotate a complex number z around a center c by an angle θ counter-clockwise, we can use the formula: z' = c + (z - c) * e²(iθ), where i is the imaginary unit and e²(iθ) is the complex exponential function.

Using these formulas, we can calculate z1 and z2 as follows:

z1 = c1 + (z0 - c1) * e²(iπ/4)

z2 = c2 + (z1 - c2) * e²(iπ/4)

To simplify these expressions, we can use the fact that e²(iπ/4) = 1/√2 + i/√2, which gives us:

z1 = (c1 + z0)/√2 + i(c1 - z0)/√2

z2 = (c2 + z1)/√2 + i(c2 - z1)/√2.

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Answer:

Explanation:

Decomposition reaction, also known as analysis or dissociation, is a type of chemical reaction in which a compound breaks down into simpler substances or elements. In this reaction, a single reactant undergoes a chemical change and produces two or more products.

The decomposition reaction can be represented by the general equation:

AB → A + B

Where AB is the reactant, and A and B are the products. The reactant AB is usually a compound, and it breaks down into its constituent elements or simpler compounds.

There are different types of decomposition reactions, including:

Thermal decomposition: It occurs when a compound is heated, resulting in its decomposition into simpler substances. For example, the thermal decomposition of calcium carbonate (CaCO3) produces calcium oxide (CaO) and carbon dioxide (CO2):

CaCO3 → CaO + CO2

Electrolytic decomposition: It takes place when an electric current is passed through an electrolyte, causing it to break down into its component ions. For instance, the electrolysis of water (H2O) leads to the decomposition into hydrogen gas (H2) and oxygen gas (O2):

2H2O → 2H2 + O2

Photochemical decomposition: It occurs when a compound undergoes decomposition due to exposure to light energy. Chlorine gas (Cl2) can decompose into chlorine atoms (Cl) under the influence of light:

Cl2 → 2Cl

These are just a few examples of decomposition reactions. They are important in various chemical processes and are used in industries, laboratory experiments, and natural phenomena. By understanding and controlling decomposition reactions, scientists can gain insights into the behavior of different compounds and develop practical applications in fields such as chemistry, materials science, and environmental science.

Answer:

Explanation:

reaction in which a compound breaks down into simpler substances or elements

The empirical formula for a substance that is 12.67 % aluminum, 19.73% nitrogen, 67.60% oxygen is Al(NO₃)₃.

given that :

aluminum = 12.67 %  = 12.67 g

nitrogen = 19.73 % = 19.73 g

oxygen = 67.60 % = 67.60 g

molar mass of aluminum = 12.67 / 26.98

                                         = 0.46 mol

molar mass of nitrogen = 19.73 / 14

                                       = 1.40 mol

molar mass of oxygen = 67.60 / 16

                                      = 4.2 mol

divided by the smallest one , we get:

aluminum = 0.46 / 0.46 = 1

nitrogen = 1.40 / 0.46 = 3

oxygen = 4.2 / 0.46 = 9

The empirical formula is = Al(NO₃)₃

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The answer of the mathematical operation to the correct number of significant figures is 1.71x10⁻⁴

The answer of the mathematical operation to the correct number of significant figures is 7.2

The no of significant figures in the answer depends on the no of significant figures in the problem given.

It is given 1.05x10⁻³/6.135 , so the number of significant figures in 1.05x10⁻³ is 3 and in 6.135 is 4. So the answer of this operation will be rounded off to have 3 significant figures only. Since the calculated amount comes out as 0.17114x10⁻³. But it has to be rounded to 4 significant figures. So the answer will be 1.71x10⁻⁴

It is given 21-13.8 , so the number of significant figures in the operation are 2 and 3 respectively. So the calculated amount comes to be 7.2 and it already has 2 significant figures.

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Answer:

Pure substances have the ability to form predictable outcomes from their chemical reactions. Chemists tend to use pure substances when conduction chemial research as impure substances can mess up their experiments.

Answer:

I think its B im not sure

but i hope this helps

The reaction between tin (II) oxalate and lithium chloride is that it forms tin (II) chloride and lithium oxalate, which are the products of the reaction. The balanced chemical equation for the reaction is  SnC₂O₄ + 2 LiCl → SnCl₂ + Li₂C₂O4.

Tin (II) oxalate reacts with lithium chloride to form a precipitate of tin (II) chloride and lithium oxalate. The reaction between tin (II) oxalate and lithium chloride is given below.

SnC₂O₄ + 2 LiCl → SnCl₂ + Li₂C₂O4

The balanced chemical equation for the reaction is as follows:

SnC₂O₄ + 2 LiCl → SnCl₂ + Li₂C₂O4 .

SnC₂O₄ is tin (II) oxalate, while LiCl is lithium chloride.

SnCl₂ is tin (II) chloride, while Li₂C₂O4 is lithium oxalate.The products of the reaction between tin (II) oxalate and lithium chloride are tin (II) chloride and lithium oxalate. Tin (II) chloride is a white crystalline powder that is soluble in water, whereas lithium oxalate is a white solid that is insoluble in water.The reaction between tin (II) oxalate and lithium chloride is a double displacement reaction, which is also known as a metathesis reaction. When a double displacement reaction takes place, two compounds exchange their cations and anions, resulting in the formation of two new compounds.

The reaction is a double displacement reaction or metathesis reaction where two compounds exchange their cations and anions to form two new compounds.

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Answer:

B. 0.35mol KClO3

Explanation:

The balanced equation in this question is given as follows:

2KClO3 → 2KCl + 3O2

Based on the chemical reaction;

2 moles of KClO3 decomposes into 3 moles of O2

If 0.525 moles of O2 are produced, then:

= 0.525 × 2/3

= 1.05/3

= 0.35mol of KClO3 is decomposed.

Answer:

Explanation:

The objects velocity will decrease because the force is opposing its motion

Answer:

the sum is Rs 4,200

Explanation:

Given that

3 by 7 of the sum is $1,800

We need to find out the sum

So,

Here we assume the sum be x

So the following equation should be made

3 ÷ 7 × x = 1800

3x = 1800 × 7

x = (1800 × 7) ÷ 3

= Rs 4,200

Hence, the sum is Rs 4,200

The same would be considered and relevant

The total quantity of heat evolved in converting the steam to ice is determined as  -12,928.68 J.

The total heat evolved is calculated as follows;

Q(tot) = Q1(steam to boiling point) + Q2(boiling point to ice) +Q3(freezing to -42 ⁰C)

where;

Q = = mcΔθ

where;

Q(tot) = 2(18)(2.01)(100 - 135) + 2(18)(2.01)(0 - 100) + 2(18)(2.09)(-42 - 0)

Q(tot) = -12,928.68 J

Thus, the total quantity of heat evolved in converting the steam to ice is determined as  -12,928.68 J.

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Approximately 214 grams of the radioactive substance will remain after 70 minutes.

To calculate the amount of radioactive substance that will remain after 70 minutes, we can use the formula:
Final amount = Initial amount * (1 - decay rate)^time
Given that the decay rate is 1.9% per minute and the initial amount is 1000 g, we can substitute these values into the formula:
Final amount = 1000 g * (1 - 0.019)^70

Simplifying the equation:
Final amount = 1000 g * (0.981)^70
Evaluating the equation:
Final amount ≈ 1000 g * 0.214
Final amount ≈ 214 g

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The pressure of the NH3 gas is 2.19 atm, a sample of 4.30 moles of NH3 gas occupies 6.50 L at 45°C.

Gas pressure is the force per unit area exerted by a gas on the walls of its container. It is a measure of the number of gas molecules colliding with the container's walls per unit of time, and is proportional to the number of gas molecules and their kinetic energy. It is a result of the gas molecules moving randomly in all directions and colliding with the walls of the container. When a gas is confined in a container, its pressure is exerted equally in all directions. The pressure is a scalar quantity, which means it has only magnitude and does not have a direction.

Gas pressure can be measured in a variety of units, including atmospheres (atm), torr, pascals (Pa), and pounds per square inch (psi). The most commonly used units for measuring gas pressure are atmospheres and pascals.

To calculate the pressure of a gas, the Ideal Gas Law is used which states that \(PV = nRT\), where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.

First step:  Convert the temperature from Celsius to Kelvin:

45°C + 273.15 = 318.15 \(K\)

Second step:Plug in the values and solve for P:

\(P = (nRT) / V\)

\(P = (4.30 moles * 0.0821 Latm/molK * 318.15 K) / 6.50 L\)

\(P = 2.19 atm\)

So, the pressure of the \(NH3\) gas is 2.19 \(atm\).

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Answer:

Fe₃PO₄

Explanation:

They have given the total mass of the compound, the mass of iron and the mass of phosphorus. So we can find the mass of oxygen.

Mass of oxygen = 12.17 - (7.77 + 1.44) = 2.96g

So we can now find the empirical formula.

Element - mass - Mr - Mass÷Mr - Ratio - Simplest Ratio

Fe - 7.77g - 55.8 - [7.77÷55.8] - [0.14÷0.05]  - 2.8 = 3

P   - 1.44g -   31   -   [1.44÷31]    - [0.05÷0.05] - 1

O  - 2.96g -   16  -   [2.96÷16]   - [0.19÷0.05]  - 3.8 = 4

[The simplest ratio was obtained by dividing the answer of mass÷mr with the smallest value. Phosphorus had the smallest value of mass÷mr=0.05, so all other answer were divided by 0.05]

Emperical formula = Fe₃PO₄

Answer:

ver explicacion

Explanation:

Los orbitales híbridos se obtienen mediante una combinación de orbitales atómicos.

En un átomo de carbono con hibridación sp3, el átomo de carbono es tetraédrico con un ángulo de enlace de 109,5 grados. Se pueden unir cuatro enlaces simples al átomo de carbono. Se pueden unir un total de cuatro átomos al carbono. Se puede unir un total de cuatro átomos al carbono, lo que ocurre en alcanos como el metano

Para un átomo de carbono con hibridación sp2, hay dos enlaces dobles y dos enlaces simples unidos al átomo de carbono que tiene una geometría plana trigonal con un ángulo de enlace de 120 grados. Se pueden unir un total de dos átomos al carbono. Se pueden unir un total de dos átomos al carbono. Esto ocurre en alquenos como el eteno.

Un átomo de carbono con hibridación sp tiene un ángulo de enlace de 180 grados y tiene una geometría lineal con un enlace triple y un enlace sencillo. Solo se puede unir un átomo al carbono. Esto ocurre en alquinos como el etino.

E = 6.676 × 10^-27 × (2.998 × 10^8)² = 6.007 × 10^-10 J/mol. The energy released per mole of Po-214 decay = 6.007 × 10^-10 J/mol = 0.60 nJ/mol ≈ 0.6 × 10^-3 J/mol = 0.0006 J/mol. Hence, the correct option is a) 9.75 x 10^-3 J/mol.

The given equation is Po-214 Pb-210+ He-4 [Atomic masses: Pb-210 209.98284 amu, Po-214-213.99519 amu, He-4 = 4.00260 amu.]. According to the given equation, one mole of Po-214 decays to produce one mole of Pb-210 and one mole of He-4. The mass defect of Po-214 = (214.00000 - 209.98284) amu = 4.01716 amu. The mass defect of He-4 = (2 × 4.00260 - 4.00000) amu = 0.00520 Amu. The total mass defect in this reaction = 4.01716 + 0.00520 = 4.02236 amu. The mass defect corresponds to the energy released by the reaction according to Einstein's mass-energy relation: E = mc² = Δm × (1.6605 × 10^-27 kg/amu) × (2.998 × 10^8 m/s)²The mass defect Δm = 4.02236 amu × 1.6605 × 10^-27 kg/amu = 6.676 × 10^-27 kg.

Therefore, E = 6.676 × 10^-27 × (2.998 × 10^8)² = 6.007 × 10^-10 J/mol. The energy released per mole of Po-214 decay = 6.007 × 10^-10 J/mol = 0.60 nJ/mol ≈ 0.6 × 10^-3 J/mol = 0.0006 J/mol. Hence, the correct option is a) 9.75 x 10^-3 J/mol.

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Answer:

D. the answer is CAT-CGA-TCC mutates to CAT-TC

Explanation:

The mutation that is an example of deletion is;  CAT - CGA - TCC mutates to CAT - TCC

Mutation refers to the change in the amino acid sequence of a protein. There are several types of mutation such as;

Deletion involves the removal of part of the amino acid sequence in a protein sequence. In the case of CAT - CGA - TCC mutates to CAT - TCC, the CGA was removed and not replaced by any other codon. This is deletion.

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Elements that are usually shiny and good conductors of heat and electricity are metals.

The conductors are the metal or non metal elements which allow heat and electricity to easily pass through them.

Metals are elements with good conductivity of electric current and heat. Metals have lustre characteristics. They are shiny and bendable just like copper wire, which is a metal.

Hence, elements that are usually shiny and good conductors of heat and electricity are metals.

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The validity of the statements are as follows:
1. True

2. True

3. False

4. True

5. False

6. False

7. True

8. True

9. False

10. True

11. False

12. False

13. True

14. True

15. False

Food scientists are using techniques such as irradiation and pulsed electric field technology to extend the shelf-life of food, while artificial flavors can be created to mimic the taste of natural foods, as done by Givaudan, the world's largest flavorings manufacturer.

Here are the correct responses to the statements:

1. True: Bursts of high-voltage electricity can kill bacteria such as E. coli and salmonella.

2. True: Food scientists can copy the flavor of natural foods using artificial alternatives.

3. False: The shelf-life of food refers to how long the product can be stored before it becomes unfit for consumption, not the price.

4. True: Scientists refer to artificial flavor components as "nature identical chemicals."

5. False: The statement mentions that Givaudan has produced 200 synthetic flavors for strawberry, not 300 flavors for a real banana.

6. False: Bacteria like salmonella and E. coli are harmful and can cause food spoilage, so they do not extend the shelf-life of food.

7. True: Food manufacturers aim to extend food freshness to serve consumers and increase profits.

8. True: Pulsed electric field technology can give food a fresher appearance even for an extended period.

9. False: Synthetic flavors are not inherently natural; they are artificial.

10. True: Irradiation involves exposing a product to an acceptable level of gamma ray radiation.

11. False: A real banana has 225 natural flavor components, not 200.

12. False: The Swiss firm Givaudan is the world's biggest flavorings manufacturer but does not exclusively supply irradiated food.

13. True: Fresh foods exposed to bursts of high-voltage electricity can stay fresh longer.

14. True: Food companies invest significant funds in research to find ways to prolong the shelf-life of food.

15. False: The name of the vice president mentioned is Dr. Heini Menzi, not Dr. Heinz Menzi. The location mentioned is outside Zurich, not specifically in Zurich.

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The molar mass of the total amount of mixture of one kmol and 2 kg of oxygen is 30 kg.

Generally, molar mass of a substance is defined as the mass in grams of one mole of the compound. Basically, in a substance, the amount of entities present e.g. atoms, molecules, ions, is defined as a mole.

N₂ = 1 kmol

O₂ = 2 kg

The conversion factor to be used to change kmol into kg = 28 kg/kmol

So, the mass of N₂ in kilograms = 1 kmol × 28 kg/kmol = 28 kg

Therefore, the total amount of the mixture = Mass of N₂ + Mass of O₂

Substituting the values we get,

Molar mass = 28 kg + 2 kg = 30 kg

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Answer:

True

Explanation:

Because its hardness makes it resistant to Mechanical and Chemical Weathering.

Answer:

B.

Explanation:

The most abundant element in the Earth's crust is oxygen, making up 46.6% of Earth's mass.