Acetic acid (Hac) solution was prepared by dissolving 0.05 moles of acetic acid (Hac pKa = 4.8) in water to give 1 liter. What is the initial pH of the solution. 50 ml of 1.00 of NaOH was added to the acetic acid solution from a previous question to neutralize it. What is the new pH of the solution

Answer:

4:10

Explanation:

a:b

2:3

6:10

b:c

The common ratio is b

The lcm of 3 and 6 is 6.

Multiply the first ratio by 2 and the second one by 1

a:b:c

4:6:10

hence a:c = 4:10

Answer:

A. structural adaptation

Explanation:

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1. Hours

2. 2 hours

3. 1 hour and 50 minutes

4. Hours

5. 300 minutes

6. 7 hours

7. 240 minutes is the same as 4 hours

Answer:

B George Washington

Explanation:

Hope it helps

Answer::

*Gravitational potential energy transforms into thermal energy.*

O Gravitational potential energy transforms into kinetic energy.

O Gravitational potential energy transforms into thermal energy.

In this case, both options A and B are correct.

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False

Atomic attributes are attributes that cannot be further divided. They are indivisible attributes that represent the smallest possible unit of information in a given context. For example, in a student record, the atomic attributes could be the student ID number, first name, last name, and date of birth.

In the context of database design, an attribute refers to a characteristic or property of an entity or object. Atomic attributes are those that are indivisible or cannot be further broken down into smaller components within the given context.

Atomicity is an important concept in database normalization, which is the process of organizing data in a database to eliminate redundancy and ensure data integrity. The first normal form (1NF) requires that each attribute in a relation (table) should hold only atomic values. This means that a single attribute should not contain multiple values or be composite in nature.

For example, let's consider a table representing employees in a company. The attribute "Name" would typically be atomic because it represents a single piece of information and cannot be further divided into smaller components within the given context. On the other hand, an attribute like "Address" might not be atomic since it can contain multiple elements such as street, city, state, and postal code.

By ensuring that attributes are atomic, it becomes easier to manipulate and query the data, maintain data consistency, and avoid data redundancy. It also helps in establishing a clear and well-defined structure for the database, making it easier to manage and analyze the data effectively.

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Answer:

Rocky road ice cream is an example of a __________Homogeneous___________ mixture.

the answers to the questions based on the element sodium:

Is it metal? - Yes

Is it a non-metal? - No

Is it gas at room temperature? - No

Is it a solid at room temperature? - Yes

Is it a liquid at room temperature? - No

Is it in the first row (period) of the periodic table? - No

Is it in the second row (period) of the periodic table? - Yes

Is it in the third row (period) of the periodic table? - No

Is it in the fourth row (period) of the periodic table? - No

Is it in the fifth row (period) of the periodic table? - No

Is it in the sixth row (period) of the periodic table? - No

Is it in the seventh row (period) of the periodic table? - No

Is it in the eighth row (period) of the periodic table? - No

Is it a noble gas? - No

Is it a halogen? - No

Is it an alkali metal? - Yes

Is it an alkaline earth metal? - No

Is it a transition metal? - No

Does its symbol start with the letter "C"? - No

Does it have an atomic number greater than 50? - No (Sodium has an atomic number of 11)

Periodic Table 20 Questions" is a game where one player thinks of an element from the periodic table, and the other player asks up to 20 yes or no questions to guess the element.

The questions are usually related to the element's properties, such as its atomic number, symbol, group, or period, as well as its physical and chemical characteristics.

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the question is incomplete. complete question is

The element is sodium(Na)

Is it metal? - Yes or No

Is it a non-metal? - Yes or No

Is it gas at room temperature? - Yes or No

Is it a solid at room temperature? - Yes or No

Is it a liquid at room temperature? - Yes or No

Is it in the first row (period) of the periodic table? - Yes or No

Is it in the second row (period) of the periodic table? - Yes or No

Is it in the third row (period) of the periodic table? - Yes or No

Is it in the fourth row (period) of the periodic table? - Yes or No

Is it in the fifth row (period) of the periodic table? - Yes or No

Is it in the sixth row (period) of the periodic table? - Yes or No

Is it in the seventh row (period) of the periodic table? - Yes or No

Is it in the eighth row (period) of the periodic table? - Yes or No

Is it a noble gas? - Yes or No

Is it a halogen? - Yes or No

Is it an alkali metal? - Yes or No

Is it an alkaline earth metal? - Yes or No

Is it a transition metal? - Yes or No

Does its symbol start with the letter "C"? - Yes or No

Does it have an atomic number greater than 50? - Yes or No

Answer:

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

\(volume = \frac{mass}{density}\\\)

From the question

mass = 37.4 g

density = 0.017 g/L

We have

\(volume = \frac{37.4}{0.017} \\ = 2200\)

We have the final answer as

Hope this helps you

Answer:

Element Helium have 2 energy levels.

Explanation:

HELIUM - With the symbol He and the atomic number 2, helium is a chemical element. It is a colorless , odorless, tasteless, non-toxic, inert, monatomic gas that is the first in the periodic table in the noble gas group. Of all the elements, its boiling point is the lowest.

At about 24 % of the total elemental mass, which is more than 12 times the mass of all the heavier elements combined, it is present. In both the Sun and Jupiter, its abundance is identical to this. This is due to helium-4's very high nuclear binding energy (per nucleon) with respect to the next three elements following helium.

Hence , the answer is 2 energy levels in Helium atom.

Answer: It appears as though fresh water has a surface tension of 72.5 mN/m

Explanation: Since fresh water does not have a high concentration of salt, and pure fresh water has no salt at all, you are trying to find the value of surface tension at 0% salinity. At 0% salinity, the surface tension value is 72.5 mN/m

The number of moles of NaCl contained in 5 L of a 2.2 M solution is 11 moles

The molarity of a solution gives a relationship between volume and mole of substance. The mathematical relationship is given below:

Molarity = number of mole / Volume

With the above formula, we can determine the number of mole of NaCl in the solution. Details below:

Molarity = number of mole / Volume

Cross multiply

Number of mole = molarity × volume

Number of mole of NaCl = 2.2 × 5

Number of mole of NaCl = 11 moles

Thus, the number of moles of NaCl is 11 moles

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Gravity, as a fundamental force of nature, is influenced by several factors. The following are some of the key factors affecting gravity:

1. The mass of nitrogen is 0.16 g

2. The volume of excess reactant is 5.4 L

We know that;

For chlorine

1 mole of the gas occupies 22.4 L

x moles of the gas occupies 13 L

x = 0.58 mol

For ammonia;

1 mole of the gas occupies 22.4 L

x moles of the gas occupies 10 L

x = 0.45 mol

8 moles of ammonia reacts with 6 moles of chlorine

0.45 moles of ammonia would react with 0.45 * 6/8

= 0.34 moles

Ammonia is the limiting reactant

If 8 moles of ammonia produces 1 mole of hydrogen

0.45 moles of ammonia would produce 0.45 * 1/8

= 0.056 moles

Mass of nitrogen = 0.056 moles * 28 g/mol

= 0.16 g

Amount of excess reactant = 0.58 mol - 0.34 mol

= 0.24 mol

If 1 mole occupies 22.4 L

0.24 moles occupies 0.24 * 22.4

= 5.4 L

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Hg⁺ with I⁻ forms HgI

Hg⁺ with S²⁻ forms Hg₂S

Hg⁺ with CO₃²⁻ forms Hg₂CO₃

K⁺ with I⁻ forms KI

K⁺ with S²⁻ forms K₂S

K⁺ with CO₃²⁻ forms K₂CO₃

Answer:

When fuels are burned in vehicle engines, high temperatures are reached. At these high temperatures, nitrogen and oxygen from the air combine to produce nitrogen monoxide. When this nitrogen monoxide is released from vehicle exhaust systems, it combines with oxygen in the air to form nitrogen dioxide.

Explanation:

Explanation:

Nitrogen and oxygen from the air combine at high temperatures in the engine to produce nitrogen (II) oxide by the reaction :

N2(g) + O2(g) → 2NO(g).

Nitric oxides rise in the atmosphere and are oxidized to nitrogen dioxide, NO2 which dissolves in the precipitating water to form acid rain.

76 grams of potassium chloride will not dissolve in 100 grams of water at 20°C.

The solubility of potassium chloride in water at 20°C is approximately 34 grams per 100 grams of water.

So, if 100 grams of water can dissolve 34 grams of potassium chloride, then the maximum amount of potassium chloride that can be dissolved in 100 grams of water at 20°C is 34 grams.

Therefore, the amount of potassium chloride that will not dissolve in 100 grams of water at 20°C is:

110 grams - 34 grams = 76 grams

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Answer: Measure the density

Explanation: pretty sure the density could identify if it is a mixture or a pure substance

Answer:

Explanation:

1. Sodium

2. Ammonium Carbonate

3. Potassium phosphate

4. Calcium sulphate

5. Zinc nitrate

6. Iron(III) oxide-hydroxide

7. Aluminium phosphate

8.Cobalt(III) Carbonate

9. Iron(II) sulfate

10. Magnesium chloride

11. Nitric acid

Answer:

1. Sodium

2. Ammonium Carbonate

3. Potassium phosphate

4. Calcium sulphate

5. Zinc nitrate

6. Iron(III) oxide-hydroxide

7. Aluminium phosphate

8.Cobalt(III) Carbonate

9. Iron(II) sulfate

10. Magnesium chloride

11. Nitric acid

Explanation:

Answer:

Explanation:

1).  Ca(NO₃)₂ + KI → CaI + K(NO₃)₂

    This equation is incorrect.

    When Ca⁺⁺ reacts with I⁻, final product is CaI₂

    And when K⁺ react with NO₃⁻, final product is KNO₃

    Hence the equation will be,

    Ca(NO₃)₂ + KI → CaI₂ + KNO₃

    Now we have to balance this equation.

     Ca(NO₃)₂ + 2KI → CaI₂ + KNO₃

                          ↓

     Ca(NO₃)₂ + 2KI → CaI₂ + 2KNO₃

2). Ca(NO₃)₂ + KOH → CaOH + K(NO₃)₂

    This equation is incorrect,

    Since the reaction of Ca⁺⁺ with OH⁻ gives the final product     Ca(OH)₂

    And final product of K⁺ and NO₃⁻ is KNO₃

    Therefore, the equation will be,

    Ca(NO₃)₂ + KOH → Ca(OH)₂ + KNO₃

    Now we will balance this equation by changing the coefficients of the      molecules until the number of atoms on both the sides become equal.

    Ca(NO₃)₂ + KOH → Ca(OH)₂ + 2KNO₃

                                ↓

     Ca(NO₃)₂ + 2KOH → Ca(OH)₂ + 2KNO₃

3). Ca(NO₃)₂ + Na₂C₂O₄ → CaC₂O₄ + 2Na(NO₃)₂

    This equation is incorrect,

    Since the reaction of Na⁺ and NO₃⁻ gives the final product    NaNO₃.

    Therefore, the correct equation will be,

    Ca(NO₃)₂ + Na₂C₂O₄ → CaC₂O₄ + 2NaNO₃

     This equation is in the balanced form.

Answer

False

Explanation:

The mass of the iron will produce is equal to 11.16 grams and iron oxide will be the limiting reagent.

A limiting reagent can be explained as the reactant present in the chemical reaction which is consumed completely first during the completion of a reaction.

The limiting reagent in a chemical reaction decides the amount of the product when the reactants are not taken in stoichiometry.

Given, chemical reaction of iron oxide and aluminum represented as:\(Fe_2O_3 + 2Al \longrightarrow Al_2O_3 + 2Fe\)is:

The mass of the iron oxide = 16 g

The number of moles of iron oxide = 16/159.7 = 0.1 moles

The mass of aluminum powder = 8.1 g

The number of moles of Al = 8.1/27 = 0.3 mol

The 2 moles of Al react with iron oxide = 1

0.3 moles of Al react with iron oxide = 0.3/2 = 0.15 mol

Therefore iron oxide is a limiting reagent.

One mole of iron oxide will produce iron = 2 mol

0.1 mol of iron oxide will produce iron metal = 2 × 0.1 = 0.2 mol

The maximum mass of iron metal = 0.2 ×55.8 = 11.16 g

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The measurable difference in charges of atoms is known as electronegativity.

Electronegativity is the measure of the capability of an atom in a molecule to pull electrons toward itself. In general, this measure increases from left to right across a period and decreases down a group of the periodic table.

Electronegativity usually increases with increasing atomic number and decreases with increasing distance from the nucleus of an atom.

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Answer:

it can be increased by the number of atoms on each side

Answer: The chemical formula is Ch(HCO3)2 and Cn(HO3)2

Explanation:

There is 1 atom of Ba, 2 atoms of hydrogen, 2 atoms of carbon, and 6 atoms of oxygen.

The smallest particle of a substance has all of the physical and chemical properties of that substance.

The chemical formula Ba(HCO3)2 tells us about the number of atoms of each element present​ as follows:

1 atom of Ba

2 atoms of hydrogen

2 atoms of carbon

6 atoms of oxygen.

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Answer:

Answer:

IT IS CORONAAAAAAAAAAAAAAAAAAAAA

Answer:

coronavirus is a lung disease, it makes it so that you have a fever, cough, trouble breathing, mild headaches, and sometimes even nausea. you should be cautious because if your at high risk your gonna have trouble recovering from it. wearing a mask could help protect others from the spread of coronavirus. others wearing a mask prevents you from the spread of coronavirus. if you do catch it, make sure you see your doctor and isolate yourself for two weeks to a month and try not to go out as much.

The given model needs to be altered to represent the residue that remains after the solid potassium chlorate is heated.

Potassium chlorate is a white crystalline salt that is commonly used as an oxidizing agent in the manufacture of explosives and matches. It's also utilized in the production of fireworks and safety matches. It's a powerful oxidizing agent that's used to make match heads, explosives, and fireworks.

It's also used in the manufacture of other chemicals, such as potassium perchlorate and sodium chlorate.The model should be altered by removing the O2 molecule from the potassium chlorate formula (KClO3). Potassium chloride (KCl) and oxygen gas (O2) are produced when potassium chlorate is heated.

Since oxygen gas is released during the reaction, the residue after heating would only be potassium chloride (KCl). Potassium chlorate can be represented as KClO3.

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The conversion of pyruvate to acetyl CoA is a crucial step in cellular respiration and occurs in the mitochondria of eukaryotic cells. The steps involved in generating acetyl CoA from pyruvate are:

Decarboxylation: Pyruvate is decarboxylated, which involves the removal of a carboxyl group (COOH) from pyruvate, resulting in the formation of acetaldehyde and the release of one molecule of carbon dioxide (CO2).

Oxidation: Acetaldehyde is further oxidized to form acetate, involving the transfer of electrons to NAD+ (Nicotinamide adenine dinucleotide), which is reduced to NADH.

Coenzyme A Attachment: Acetate is then attached to a molecule called coenzyme A (CoA) to form acetyl CoA. This step is catalyzed by the enzyme acetyl-CoA synthetase, and it involves the formation of a high-energy thioester bond between acetate and CoA.

Overall, the conversion of pyruvate to acetyl CoA involves decarboxylation, oxidation, and coenzyme A attachment, and it is a crucial step that links glycolysis (the breakdown of glucose) to the citric acid cycle (also known as the Krebs cycle or TCA cycle) in cellular respiration.

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The vapor pressure of liquid aluminum at a temperature of \(2.56 \times 10^3\)K would be 400.01856 mmHg.

The vapor pressure of a liquid can be calculated using the Clausius-Clapeyron equation, which states that the change in vapor pressure (ΔP) is proportional to the change in temperature (ΔT) and the molar heat of vaporization (ΔHvap). Mathematically, the equation can be written as:

\(\frac{\Delta P }{P} =\frac { \Delta Hvap} {RT^2 } \times \Delta T\)

Where R is the gas constant and T is the temperature in Kelvin. To calculate the new vapor pressure at a temperature of 2.56 x 10^3 K,

we need to use the above equation to find the change in vapor pressure (ΔP) and then add it to the original vapor pressure (P):

ΔT =\(2.59 \times 10^3 K - 2.56 \times 10^3 K\)

ΔT  = 3 K

\(\frac{\Delta P}{P}\)=\(\frac { \Delta Hvap} {RT^2 }\times \Delta T\)

=> \(\frac {(296 kJ/mol)} {(8.31 J/molK \times (2.59 x 10^3 K)^2)} \times 3 K\)

=> \(4.64 \times 10^{-5}\)

P new = P + ΔP

=> 400 mmHg + 400 mmHg x \(4.64 \times 10^{-5}\)

=> 400 + 0.01856 mmHg

=> 400.01856 mmHg

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