When 50 ml of water are added to 50 ml of water, the total volume of water is 100 ml. but if 50 ml of water are added to 50 ml of ethanol, the total volume will be less than 100 ml. why is this

The value of Kb for Bro- at 25°C is 3.57 x 10^-6. To determine the value of Kb for Bro-, we need to use the relationship between Ka and Kb for a conjugate acid-base pair.

The equation for this relationship is: Ka x Kb = Kw

where Kw is the ion product constant of water, which is 1.0 x 10^-14 at 25°C.

In this case, HBrO is the conjugate acid of Bro-, so we can write:

Ka(HBrO) x Kb(Bro-) = Kw

Substituting the given value for Ka(HBrO):

2.8 x 10^-9 x Kb(Bro-) = 1.0 x 10^-14

Solving for Kb(Bro-):

Kb(Bro-) = (1.0 x 10^-14) / (2.8 x 10^-9)

Kb(Bro-) = 3.57 x 10^-6

Therefore, the value of Kb for Bro- at 25°C is 3.57 x 10^-6.

In summary, we used the relationship between Ka and Kb for a conjugate acid-base pair, along with the ion product constant of water, to determine the value of Kb for Bro-.

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Answer:In chemistry, an oxidizing agent (oxidant, oxidizer), or oxidising agent (oxidiser) is a substance that has the ability to oxidize other substances — in other words to accept their electrons.

Explanation:

The phrase which describes an oxidizing agent is the substance that is reduced because it gains electrons. Thus option D is correct.

An oxidizing agent is defined as a chemical spices that tends to oxidize other substances that is causes increase in the oxidation state of the substance by making it lose electrons and the oxidizing agent itself gains electrons.

It can be defined as a substance that causes oxidation by being reduced and gaining electrons.

Any substance that oxidizes another substance is referred to as an oxidizer.

Oxidizing agents can be defined as an electron acceptor agents or as an electron transferring substance.

Thus, the phrase which describes an oxidizing agent is the substance that is reduced because it gains electrons. Thus option D is correct.

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Your question is incomplete, but probably your complete question was

Which describes the oxidizing agent in a chemical reaction?

A. the substance that is oxidized because it loses electrons

B. the substance that is reduced because it loses electrons

C. the substance that is oxidized because it gains electrons

D. the substance that is reduced because it gains electrons

A lubricant must keep its properties in the presence of additives and other items. Lubricating oil colours are more of a test for a grade or brand of oil's consistency than they are for its attributes. Thus, option B is correct.

There are four different kinds of liquid lubricants. Mineral oil a. It is a material made from petroleum. These oils are stable at high temperatures because they have a high paraffine and naphthanic content.

Examples include steam cylinder oil, wire rope oil, refrigeration grade oil, gear oil, machine or engine oil, and circulating oil.

Therefore, they should be used at lower cutting speeds than other types of cutting fluids. They make cutting surfaces smoother.

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Answer:

Copper (IV) Phosphate.

Explanation:

Copper (IV) Phosphate is an inorganic compound consisting of copper in its +4 oxidation state and phosphate anions. It has the chemical formula CuPO₄ and is commonly used as a component in catalysts, pigments, and ceramic materials. The "IV" in its name refers to the oxidation state of copper, which is +4.

Answer:

x is calcium and y is chlorine

these are the p block elements

calcium belongs 4 th period and chlorine belongs to period 3rd

they forms ionic bond

chemical formula is

Ca+2 Cl-

CaCl2

Explanation:

give me brainly hope i helped!!!

The cell notation is defined as the representation of the oxidation-reduction reactions happening in the cells with the help of anode, cathode, and salt bridges. The cell notation format is given below: anode | anode solution || cathode solution | cathode where:anode:

The electrode where oxidation occurs-cathode: The electrode where reduction occurs anode solution: The solution which is in contact with anode-cathode solution: The solution which is in contact with cathode salt bridge: It is used to complete the circuit by allowing the movement of ions between two solutions.The proper line notation for the given reaction is, Cd(s) | Cd²⁺(aq) || Ag⁺(aq) | Ag(s)

The given equation is a galvanic cell, and the line notation follows the anode | anode solution || cathode solution | cathode. Here, the Cd is the anode, and Ag is the cathode. Ag⁺ ion is reduced to Ag and Cd is oxidized to Cd²⁺. The cell diagram has salt bridges. Thus, the correct cell notation is shown below:anode: Cd(s) | Cd²⁺(aq)cathode: Ag⁺(aq) | Ag(s)overall reaction: Cd(s) + 2Ag⁺(aq) → Cd²⁺(aq) + 2Ag(s)E°cell = 1.20 V

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Answer:

The color or hue of light depends on its wavelength, the distance between the peaks of its waves. The brightness of light is related to intensity or the amount of light an object emits or reflects. Brightness depends on light wave amplitude, the height of light waves.

Explanation:

Hope this helps.

Answer:

Ecosystem Energy Flow Nearly all of the energy that drives ecosystems ultimately comes from the sun. Solar energy, which is an abiotic factor, by the way, enters the ecosystem through the process of photosynthesis. You can learn more than you want to know about this process in the unit on photosynthesis.

Explanation:

Answer:

the answer is B  Equals i just took the test

Answer:

2.82 * 10^-25 g

Explanation:

Given that :

Atomic number = 17

Mass of an atom of the element =?

Avogadro's constant = 6.022 * 10^23

The mass of an atom. Of the element is :

Atomic mass / Avogadro's constant

= 17 / 6.022 * 10^23

= 2.82 * 10^-25

=

After adding 470.0 mL of an 8.8 times 10^-5 mM silver(II) oxide (AgO) solution to a reaction flask the chemist will get 5.1 μg of silver (II) oxide the chemist has added to the flask.

Step 1: Presented data

470.0 mL is the solution's volume (V) (0.4700 L)

Solution concentration (C): 8.8 105 mM (8.8 108 M).

Step 2: Determine the moles (n) of additional AgO.

The following expression will be used.

n = C × V

n = 8.8 108 mol/L 0.47 liters

n = 4.1 × 10⁻⁸ mol

Calculate the mass (m) equal to 4.1 10⁸ moles of AgO in step three.

AgO has a molar mass of 123.87 g/mol.

5.1 106 g = 4.1 10⁸ mol x 123.87 g/mol

Fourth step: Change "m" to micrograms

We'll take 1 g = 10⁶ g as our conversion factor.

5.1 × 10⁻⁶ g × 10⁶ μg/1 g = 5.1 μg

The complete question is:

A chemist adds 470.0 mL of an 8.8 times 10^-5 mM silver(II) oxide (AgO) solution to a reaction flask. Calculate the mass in micrograms of silver(II) oxide the chemist has added to the flask. Round your answer to 2 significant digits.

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The hospital's experimentation with peroral endoscopic myotomy (POEM) filling is part of the tertiary care position.

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The two-sided confidence interval is (87.85 ≤ μ ≤ 93.11) , with 87.85 being the lower level and 93.11 being the upper level.

The amount of product you actually get after doing an experiment is known as the experimental yield. Calculating the % yield will show you how much of the theoretical yield you actually achieved in a particular experiment. The quantity of pure and dry product produced in a chemical reaction is known as the reaction yield (absolute yield). The relative or percentage yield (%) is typically determined in order to assess the effectiveness of a chemical process in organic synthesis.

The percent yield can be calculated by applying the following formula:%yield = (actual yield/theoretical yield) x 100.

Step-by-step explanation:

Given the data:

91.6, 88.75, 90.8, 89.95, 91.3

Mean, m = Σx / n

n = sample size = 5

Mean = 452.4 / 5 = 90.48

Standard deviation, σ = 3

Zcritical at 95% = 1.96

Confidence interval :

Mean ± Error margin

Error margin = Zcritical*σ/sqrt

Error margin = 1.96 * 3/sqrt(5)

Error margin = 2.630

Lower boundary : 90.48 - 2.630 = 87.85

Upper boundary : 90.48 + 2.630 = 93.11

(87.85 ; 93.11)

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Answer: 0.16 M

Explanation:

molarity is a way to measure the concentration of solutions, the equation is the amount of solute in mol / liter of solution:

mol (solute) / L (solution)

the first thing you want to do is convert grams to moles:

20g NaF • 1 mol

———— = 0.47632464 mol

41.98817 g (molar mass of NaF)

then you just want to follow with the rest of the equation:

0.47632464 mol NaF / 3.0 L = 0.15877488 or 0.16 M (sigfigs)

hope this helps :)

Answer:

first identify the cation and write down its symbol and charge. Then, identify the anion and write down its symbol and charge.

Explanation:

The right response is d. Both enzymes will have the same ΔG for catalysis.

The reaction rate and equilibrium constant have an impact on the Gibbs free energy (ΔG). No matter the source of the enzyme, such as E. coli or a thermophilic microbe, the ΔG for a reaction is the same. As a result, both enzymes will have the same ΔG for sucrose hydrolysis.

The ΔG may be written mathematically as:

ΔG = -RT ln (K)

T is the temperature, K is the equilibrium constant, and R is the gas constant..

As both enzymes have the same reaction rate (K) and temperature (T), the reaction's ΔG  value will likewise be the same.

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Answer:

Adenine=33%

Thymine=33%

Guanine=17%

Explanation:

the base pairs percentages must be the same

The mass of nitrogen gas in the sample is 0.001355 g and the number of molecules of nitrogen gas in the sample is 2.91 x 10¹⁹ molecules.

At STP (Standard Temperature and Pressure), the temperature is 0°C (273.15 K) and the pressure is 1 atm (101.325 kPa).

Ideal gas law is: PV = nRT

Where P will be the pressure, V will be the volume, n is number of moles, R is the ideal gas constant, and T will be the temperature.

At STP, the value of R is 0.0821 L·atm/mol·K.

The volume of the nitrogen gas sample is 1120 cm³, which is equivalent to 0.00112 m³.

Using the ideal gas law;

n = PV/RT

n = (1 atm) x (0.00112 m³) / (0.0821 L·atm/mol·K x 273.15 K)

n = 0.0000483 moles of nitrogen gas

To calculate the mass of nitrogen gas, we use the molar mass of nitrogen, which is 28.02 g/mol.

Mass of nitrogen gas = n x molar mass

Mass of nitrogen gas = 0.0000483 moles x 28.02 g/mol

Mass of nitrogen gas = 0.001355 g

To calculate the number of molecules of nitrogen gas in the sample, we use Avogadro's number, which is 6.022 x 10²³ molecules/mol.

Number of molecules of nitrogen gas = n x Avogadro's number

Number of molecules of nitrogen gas = 0.0000483 moles x 6.022 x 10²³ molecules/mol

Number of molecules of nitrogen gas = 2.91 x 10¹⁹ molecules

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Answer:

Explanation: the answer is YES

CO(NH2)2  and (NH2)2 CO is the urea

Answer:

No they are not identical.

Explanation:

They are not identical because there are many ranges of states that the electrons could have.

I hope it helps! Have a great day!

Muffin ^^

Answer:

No.

Explanation:

It could vary so it wouldn’t be identical.

I hope it helps! Have a great day!

bren~

Answer:

In mathematics, a coefficient is a multiplicative factor in some term of a polynomial, a series, or any expression; it is usually a number, but may be any expression. In the latter case, the variables appearing in the coefficients are often called parameters, and must be clearly distinguished from the other variables.

Explanation:

The pH and the pOH of an aqueous solution that is 0.045 M in HCl(aq) and 0.095 M in HBr(aq) at 25 °C is 1.35, and 12.98 respectively.

To calculate the pH and pOH of the solution, we need to use the concentration of the acidic solutions and the dissociation constants of HCl and HBr.

First, calculate the pH:

For HCl (aq):

[HCl] = 0.045 M

HCl is a strong acid and dissociates completely in water, so the concentration of H⁺ ions is equal to the concentration of HCl:

[H⁺] = 0.045 M

Taking the negative logarithm (base 10) of the H⁺ concentration gives us the pH:

pH = -log10(0.045)

pH = 1.35

Now, let's calculate the pOH:

For HBr(aq):

[HBr] = 0.095 M

HBr is also a strong acid, and its dissociation is similar to HCl. The concentration of H⁺ ions is equal to the concentration of HBr:

[H⁺] = 0.095 M

Again, taking the negative logarithm (base 10) of the H⁺ concentration gives us the pH:

pH = -log10(0.095)

pH = 1.02

Since pH + pOH = 14 (at 25 °C), we can calculate the pOH:

pOH = 14 - pH

pOH = 14 - 1.02

pOH = 12.98

Therefore, the pH of the solution is approximately 1.35, and the pOH is approximately 12.98.

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Option 3 accurately represents the essence of an ethogram as an inventory of species-specific behaviors.

An ethogram can be best described as an inventory of the behavior of a particular species. It is a systematic catalog or list of behaviors exhibited by a specific animal species.

An ethogram provides a comprehensive overview of the behaviors displayed by the animals under study, documenting various activities, actions, and patterns of behavior.

While options 1 and 2 are related to visual representations or descriptions of behavior, they do not capture the comprehensive nature of an ethogram. Option 4 refers specifically to behaviors observed in response to an experimental intervention, which is more narrow in scope compared to an ethogram. Therefore, option 3 accurately represents the essence of an ethogram as an inventory of species-specific behaviors.

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Answer:

C12H24

Explanation:

The molar mass of the CH2 unit is 14 g/mole.  The final molecule has multiples of CH2 so that it's molar mass is 168 g/mole.

(168 g/mole molecule)/(14 g/mole Unit) = 12 Units

12 CH2 units would make the molecualr formula:  C12H24

This is more than one structure that has this formula:  Cyclododecane and 1-Dodecene.

One potential difference between ice that Dr. Stewart is climbing and "normal" water ice could be the location or conditions in which it formed.

For example, glacier ice, which forms over many years from compacted snow, can have different properties than the ice that forms on a frozen lake or river. Similarly, ice formed in a cold laboratory setting might have different properties than ice formed under natural conditions.

Other factors that could impact the characteristics of ice include the presence of air bubbles, cracks or fissures, and the size and shape of ice crystals. Ice that has been subjected to pressure or other stresses can also exhibit unique features such as layers or bands.

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The conjugate acid of a base is formed when the base accepts a proton (H+). Here are the conjugate acids for the given compounds:

A) NH3 (Ammonia) - Conjugate acid: NH4+ (Ammonium ion)
B) NH2- (Amide ion) - Conjugate acid: NH3 (Ammonia)
C) NH3- is not a valid chemical species.
D) NH4+ (Ammonium ion) - Conjugate acid: NH5+ (not commonly encountered)
E) NH4OH (Ammonium hydroxide) - Conjugate acid: NH5O+ (not commonly encountered)y

The formation of a conjugate acid-base pair involves the transfer of a proton from one species to another. The conjugate acid of a base is always one proton greater than the original base.

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Answer: helium(He)

Explanation: Helium has only 2 electrons in the outermost energy level, but all of the other elements in its column have eight.