In the laboratory, a general chemistry student measured the pH of a 0.583M solution of HClO3 to be 3.862. What is the experimentally determined value of Ka for HClO3?
a. 1.37 x 10-4
b. 2.35 x 10-4
c. 3.11 x 10-7
d. 1.89 x 10-8
e. 3.24 x 10-8

The ionic bond between Na and P has formula unit Na3P.

What is the formula unit?

Formula units is the chemical formula which gives all the ions present in the lowest ratio possible to make it neutral charge of an ionic compound. For example, the formula unit for sodium chloride can be written as NaCl where charge on Na is +1 and charge on Cl is -1. So to make it neutral they can be cancelled and written as NaCl.

In sodium phosphide, the charge on Na (sodium) ion is +1 and the charge on the P (phosphorous) ion is -3. Therefore, make the charges neutral, 3 Na ions need to be added to 1 P ion. Formula units can be used to describe or represent the molecules or the elements which make up a substance.

Hence, Na3P is the formula unit of Na and P in sodium phosphide.

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The answer is (D) 3.20L; the gas will occupy a volume of 3.20 L at 45.0°C and 1.00 atm.

The combined gas law is a gas law that combines Boyle's law, Charles's law, and Gay-Lussac's law. It relates the pressure, volume, and temperature of a fixed amount of gas. The law states that the product of the pressure and volume of a gas is directly proportional to the product of its temperature and the number of moles of gas present.

To solve this problem, we can use the combined gas law,

(P1V1)/T1 = (P2V2)/T2

Where:

P1 = initial pressure

V1 = initial volume

T1 = initial temperature

P2 = final pressure (which is the same as the initial pressure in this case)

V2 = final volume (what we're trying to find)

T2 = final temperature

Plugging in the given values, we get:

(1.00 atm x 3.00 L) / (298.15 K) = (1.00 atm x V2) / (318.15 K)

Solving for V2, we get:

V2 = (1.00 atm x 3.00 L x 318.15 K) / (298.15 K x 1.00 atm)

V2 = 3.20 L

Therefore, the gas will occupy a volume of 3.20 L at 45.0°C and 1.00 atm.

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Answer:

B. burning a piece of wood

Explanation:

The Chemical Would Be The Air Coming From The Wood While Burning It

Tell Me If Im Correct  

The balanced chemical equation of reaction of lead chloride with potassium iodide is written as follows:

\(\rm PbCl_{2 } + 2 KI \rightarrow PbI_{2} + 2 KCl\)

In a displacement reaction, one or two element or group is displaced  from the reactants by other. There are both single displacement and double displacement reactions.

In single displacement reactions, one one element or group is displaced from a reactant by other element. In double displacement, two groups are displaced between two reactants.

The reaction between lead chloride and potassium iodide as written in the above reaction gives lead iodide and potassium chloride. Where the Cl and I atoms are displaced.

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Answer:

Sorry for the late answer, but it should be A. Carbon's outermost shell can form up to 4 covalent bonds. It's one of the reasons why Carbon is considered an "essential element".

The dissociation factor is 2 and the freezing point of the solution is -64.5 °C.

Sodium chloride is a 2-ion electrolyte, dissociating 90% in a certain concentration.

(a) Calculation of dissociation factor

Dissociation factor can be defined as the ratio of the number of ions produced from a compound to the number of molecules dissolved. This factor determines the degree to which an electrolyte dissociates in water.

Sodium chloride dissociates into Na⁺ and Cl⁻ ionsNaCl → Na⁺ + Cl⁻

The dissociation factor of Sodium Chloride is given by the expression;

α = [Total number of ions produced] / [Total number of molecules]

α = [2] / [1]α = 2

(b) Calculation of the freezing point of a molal solution

Freezing point of the solution is given by;

ΔTf = iKfm

where ΔTf is the change in freezing point, i is the van't Hoff factor, Kf is the freezing point depression constant, and m is the molality of the solution.

Due to the dissociation of NaCl into Na⁺ and Cl⁻ ions, i will be equal to 2.

The freezing point depression constant for water is given as Kf = 1.86 °C/m.

Molality is defined as the number of moles of solute per kilogram of solvent. The molecular weight of NaCl is 58.44 g/mol. So, the number of moles in 1 kg of NaCl is:

1 kg of NaCl = 1000 g / 58.44 g/mol= 17.1 molal

Thus, ΔTf = 2 * 1.86 °C/m * 17.1 molal= 64.5 °C

Therefore, the freezing point of the solution is -64.5 °C.

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Answer:

Yes, the increase in pressure of the refrigerant can be related to the increase in temperature. This is because when a gas is compressed, the molecules are forced closer together, which increases the temperature of the gas. This is known as the ideal gas law, which states that when pressure increases, temperature also increases.

The option that does not represent a characteristic of a pure substance is:

C) It is made up of different types of particles.

A pure substance is a material that consists of only one type of particle, either atoms of an element or molecules of a compound. It does not contain different types of particles. This is what distinguishes a pure substance from a mixture, which is composed of two or more different substances mixed together.

Option A states that a pure substance has a uniform texture throughout, which means it is homogeneous. This is true because pure substances have a consistent composition and properties throughout.

Option B states that a pure substance has a fixed boiling point or melting point. This is also true because pure substances have well-defined temperature ranges at which they transition between solid, liquid, and gas phases.

Option D states that a pure substance can be an element or a compound. This is true as well because pure substances can exist as either single elements or compounds consisting of two or more elements chemically bonded together.

In summary, the correct option is C, as a pure substance does not consist of different types of particles.

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The empirical formula for the given compound is BrF₃.

It is given that,

% of Br = 58.37

then % of F = 100 - 58.37 = 41.63%

Let the mass of the compound be 100 g. So, the percentages given are taken as mass.

Mass of Br = 58.37 g

Mass of F = 41.63 g

To formulate the empirical formula,

No. of moles of Br = 58.37/79.90 = 0.73 moles

No. of moles of F = 41.63/19 = 2.19 moles.

For the mole ratio, we divide each value of the moles by the smallest number of moles calculated which is 0.73 moles.

For Bromine = 0.73/0.73 = 1

For Fluorine = 2.19/0.73 = 3

Now, taking the mole ratio as their subscripts.

The ratio of Br : F = 1 : 3

Hence, the empirical formula for the given compound is BrF₃.

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The Hazardous Material class that includes compressed gases, dissolved gases, and gases liquefied by compression or refrigeration is Class 2: Gases. This class is further divided into three divisions:

1. Division 2.1 - Flammable Gases: These are gases that can burn in the presence of an ignition source. Examples include propane, butane, and hydrogen.
2. Division 2.2 - Non-Flammable, Non-Toxic Gases: These are gases that do not burn and are not toxic, but may still pose risks due to their physical properties, such as high pressure or low temperature. Examples include nitrogen, helium, and carbon dioxide.
3. Division 2.3 - Toxic Gases: These are gases that are harmful or even fatal when inhaled. Examples include chlorine, ammonia, and phosgene.

The proper handling, storage, and transportation of these gases are essential to minimize the risks associated with their hazardous properties. Regulations and guidelines are in place to ensure the safety of those working with and around these materials.

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Answer:

Elements:lead

Explanation:

Lead is a metal element. because it is made of only metal atoms,it does not dissolve in water,but it does conduct electricity.

I hope it's helpful!

1. From the ideal gas law, the variables and their units are as follows:

2. In a sealed bottle, when the temperature is raised from 200 K to 400K;

3. A life raft containing 200 g of air has another 200 g of air added.

Two quantities in the ideal gas equation that are directly proportional: temperature and volume

Two quantities in the ideal gas equation that are indirectly proportional: volume and pressure

The number of moles of the gas present in the container is 0.162 moles.

The number of moles of the gas present is calculated using the ideal gas law as follows:

PV = nRT

n = PV/RT

P = 1.8 atm

V = 2 L

G = 0.0821(L⋅atm) / (mol⋅K)

T = 270 K

n = 1.8 * 2 / 270 * 0.0821

n = 0.162 moles

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Exergonic reactions release energy during product formation.

Exergonic reactions are chemical reactions that release energy as they occur. In an exergonic reaction, the reactants contain more potential energy than the products, and the excess energy is released into the environment.

Exergonic reactions are important in many biological processes, such as cellular respiration, where energy is released from the breakdown of glucose to power the cell's activities.

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The relative thermodynamic stability of organic molecules that are isomeric can be deduced from heats of combustion, making option D the right response. Isomeric organic molecules benefit from this as well.

The quantity of heat created by the combustion of a specific amount of a substance, usually a fuel or food; see food energy—is its heating value, also known as its energy value or calorific value. When a substance burns completely with oxygen under normal circumstances, the amount of energy produced as heat is measured as the calorific value. Organic substances in chemistry are essentially any chemical molecules that have carbon-hydrogen bonds. Millions of organic compounds are known because carbon can catenate, or join with other carbon atoms to form chains.

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To produce more carbon dioxide in this reaction increase the temperature or add more baking powder.

It's worth noting that increasing the pressure in the bottle would not have a significant effect on the production of carbon dioxide, as the reaction is not affected by pressure. Decreasing the pressure would only cause the carbon dioxide to escape more quickly from the bottle.

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Answer:

1300cm3.

Explanation:

Step 1:

Data obtained from the question.

Initial temperature (T1) = K

Initial volume (V1) = 650 cm3

Final temperature (T2) = double the original = 2K

Final volume (V2) =..?

Step 2:

Determination of the new volume of the gas.

The new volume of the gas can be obtained by using Charles' law as follow:

V1/T1 = V2/T2

650/K = V2/2K

Cross multiply

K x V2 = 650 x 2K

Divide both side by K

V2 = 650 x 2K /K

V2 = 650 x 2

V2 = 1300cm3.

Therefore, the new volume of the gas is 1300cm3

The new volume of the gas is 1300cm³.

Given:

Initial temperature (T₁) = K

Initial volume (V₁) = 650 cm3

Final temperature (T₂) = double the original = 2K

To find:

Final volume (V₂) =?

Determination of new volume:

V₁/T₁ = V₂/T₂

650/K = V₂/2K

K x V₂ = 650 x 2K

V₂ = 650 x 2K /K

V₂ = 650 x 2

V₂ = 1300cm³

Therefore, the new volume of the gas is 1300cm³.

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If 1.5 moles of C₃H₈ react according to the balanced equation, 4.5 moles of CO₂ will be produced.

In the balanced equation, the coefficients in front of the molecules indicate the molar ratio. The coefficient for CO₂ is 3, which means that for every 1 mole of C₃H₈, 3 moles of CO₂ are produced.

The balanced equation shows that 1 mole of C₃H₈ reacts to produce 3 moles of CO₂. So, if 1.5 moles of C₃H₈ react, we can calculate the number of moles of CO₂ produced using a simple ratio.

1 mole of C₃H₈ reacts to produce 3 moles of CO₂.

Therefore, 1.5 moles of C₃H₈ will produce (1.5 moles of C₃H₈) x (3 moles of CO₂/1 mole of C₃H₈)

= 4.5 moles of CO₂.

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The ocean current is caused by differences in water density. The difference in the density of water is mainly caused by the temperature and salinity of water.

Density of a substance is the measure of its mass per unit volume. It describes how closely its particles are packed within a given volume. Density of a substance is dependent on the temperature and pressure also.

The density of water is affected by the temperature and salinity. Water has its maximum density at 4 ° C. The more saline is water, more will be the density. Because, more ions or salts makes water denser.

The density vary with variations in temperature and salinity. This variation causes water currents from the denser areas to the less dense areas. Ocean currents are also affected by the gravity.

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Answer:

Explanation:

Here, we want to select the most important information piece to determine saturation

The best way to check for this is to check the kind of bonds between the carbon atoms in the molecule

When there are double or triple covalent bonds between the carbon atoms, then, we can be sure that there is a degree of unsaturation (alkenes, alkynes)

If we have single bonds only, then the molecule is saturated

Answer:

It’s actually 130 degrees Celsius.

Explanation:

Answer:

It s B because 350 mg= 35.0cg=3.50dg=0.350

Answer:

its 0.350 letter B

Explanation:

im pretty sure you divide the mass value by 1000 to get you answer.

Answer:

The answer is Sedimentary

Explanation:

Thank you so much if that helps you!!!!

Answer:

Energy of an electron is quantinized means the electrons can possess only specific individually separated values.

These energy levels are stable and are stationary along with different energy value.  The electron remains in the state until energy is absorbed or released.

The electrons absorb energy when it moves from lower energy state to higher energy state. The electrons lose energy when it moves from higher energy state to lower energy state and thus emit radiations corresponding to the energy gap and is called as quanta.

The balanced equation for the reaction between sodium borohydride and ethanol that evolves a gas can be written as follows: NaBH4 + 2C2H5OH → 2C2H5OH + NaB(OCH2CH3)3 + H2

In this reaction, sodium borohydride (NaBH4) reacts with ethanol (C2H5OH) to produce a gas (H2), sodium triethylborohydride (NaB(OCH2CH3)3), and more ethanol. The reaction occurs slowly due to the nature of the reagents and the need for activation energy.

Sodium borohydride is a powerful reducing agent that is often used in organic chemistry to reduce aldehydes, ketones, and other functional groups. Ethanol, on the other hand, is a common solvent and can also act as a reducing agent under certain conditions.

When the two reagents are combined, they react to form a complex mixture of products. The evolution of hydrogen gas is a result of the reduction of ethanol by sodium borohydride.

The balanced equation represents the stoichiometric quantities of the reagents and products involved in the reaction.

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Answer:

D) lithium

Sodium Chloride is salt which is oviously present.

Oxygen is also present because fish use their gills to get oxygen from water.

Plants are present under ocean which release Carbon dioxide.

Answer:

Mid oceanic ridge

Explanation:

The plate boundary between the African and South American plate is most likely a mid - oceanic ridge.

This because the margin is a divergent margin as the motion of the two plates in this region is opposite one another.

The African plate is moving away from the South American plate.

The upper left corner is 87 Rb (option-b).

To determine the age of old rocks, scientists use the radioactive isotope rubidium-87. Its 49 billion-year half-life is very long. In high-accuracy timing devices like GPS receivers, it serves as a frequency standard as well. Bose-Einstein condensates and laser cooling are two additional uses for it.

The strontium (87Sr/86Sr) isotope ratio is a significant and potent investigative tool that has been used extensively and successfully in petrogenesis (e.g., Nakai et al., 1993; Subas et al., 2015; Kozlik et al., 2016), mineral weathering, and acidity in soils (e.g., Graustein and Armstrong, 1983; Bullen et al., 2016).

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Answer:

D

Explanation:

Solvent is the material that is dissolving another material​. Thus, option D is correct.

A solvent is a substance that dissolves another substance to form a solution. The substance that is being dissolved is called the solute, and the substance that is doing the dissolving is called the solvent. The solute is usually present in a smaller amount than the solvent, and it is the solvent that determines the physical properties of the solution, such as its density, viscosity, and boiling point.

For example, when salt is dissolved in water, the salt is the solute and the water is the solvent. The water molecules surround the salt molecules and break them apart, so that the salt ions are free to move around in the solution. The solution is then a homogeneous mixture of salt ions and water molecules.

Thus, option D is correct.

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Answer:

Taste bufs

Explanation:

May be teenager or adult is the most probable answer because teenager and adult are fully developed species of human so they can have most sensitive taste bud

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