2. The ions in an ionic compound separate from each other when
A. dissolved in water
B. when melted
C. when conducting electricity
D. never

Answer:

Mass of Chromium produced = 37.91 grams

Explanation:

2K + CrBr₂  →  2KBr + Cr

2mole     1 mole                1 mole

mass of Potassium = 57.0 grams

molar mass of Potassium = 39.1 g/mol

no of moles of Potassium = 57.0 / 39.1 = 1.458 moles

mass of CrBr₂= 199 grams

molar mass of CrBr₂ = 211.8 gram/mole

no of moles of CrBr₂ = 199 / 211.8 = 0.939 mole

From chemical equation

1 mole of CrBr₂ = 2 moles of K

∴ 0.939 moles of CrBr₂ = ?

   ⇒ 0.939 x 2/1 = 1.878 moles of K

1.878 moles of K is needed, but there is 1.458 moles of K. So, Potassium is completed first during the reaction . Hence, Potassium is limiting reagent. and CrBr₂ is excess reagent .

From chemical equation

2 moles of K = 1 mole of Cr

∴ 1.458 moles of K = ?

   ⇒ 1.458 x 1/ 2 = 0.729 moles of Cr

no of moles of Cr formed = 0.729 moles

molar mass of Cr = 52.0 g/mol

mass of one mole of Cr = 52.0 grams

mass of 0.729 moles of Cr = 52.0 x 0.729 = 37.908 grams

mass of Chromium produced = 37.91 grams

The correct answer is Atom is the tiny unit of an element that retains the properties of the element.

An atom is a kind of particle that has an electron cloud surrounding its protons and neutrons-filled nucleus. The atom is the basic building block of the chemical elements, and it is the protons in an atom that allow us to distinguish one chemical element from another. For instance, every atom with 11 protons is sodium, while any atom with 29 protons is copper. The quantity of neutrons in an element determines its isotope.

Atoms are very small, with a diameter of around 100 picometers. An typical human hair has about one million carbon atoms. Standard microscopes cannot observe atoms since this is smaller than the smallest wavelength of the visible light spectrum.

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Answer: nervous tissue to allow heart

epithelial to transmits

connective to forms like

muscle tissue to support bone

Explanation:

king_n1886        

Answer:

2.5 gallon fuel produced 21.5 kg  CO₂.

Explanation:

Given data:

CO₂ produced during burning of one gallon fuel = 8.6 kg

CO₂ produced during burning of 2.5 gallon fuel = ?

Solution:

This problem is solved through simple multiplication.

If one gallon fuel produced 8.6 kg CO₂ then 2.5 gallon produced is determined by multiplying the 2.5 with 8.6 kg.

1 gallon = 8.6 kg CO₂

2.5 ×  8.6 kg CO₂  = 21.5 kg

Thus 2.5 gallon fuel produced 21.5 kg  CO₂ .

The number of atoms contained within the unit cell of gallium that has a simple cubic unit cell and a molar mass of 69.72 g/mol and a density of 5.91 g/cm³ is \(7.56 * 10^{22}.\)

The number of atoms contained within a unit cell of gallium can be calculated using the following equation:

Number of atoms = (Molar mass / Density) / Volume of unit cell

The volume of a simple cubic unit cell is equal to the cube of its edge length, which is given by the equation:

(Edge length)^3 = (8 * molar mass) / (density * Avogadro's Constant)

Plugging in the values given, we get:

\((Edge length)^3 = (8 * 69.72 g/mol) / (5.91 g/cm^{3} * 6.02 * 10^{23})\)

\((Edge length)^3 = 15.6 * 10^{-23}cm\)

Now, plugging this value into the first equation, we get:

Number of atoms = \((69.72 g/mol / 5.91 g/cm^{3}) / 15.6 * 10^{-23}\)

Number of atoms = \(7.56 * 10^{22}\)atoms/unit cell

Therefore, there are \(7.56 * 10^{22}\) atoms contained within a unit cell of gallium.

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Answer:

B- why or how because any scientist deals with matter it's relationships ,properties and its composition which can be inferred from the questions why and how

It is advised that your friend take 172-425 grams of carbs, dependant on his size of 86 kg, two hours before to his soccer match. The ideal choice is D.

As a result of the vitamins, nutrients, and dietary fiber they provide, full grain, berries, and vegetables are regarded as healthy carbohydrates. Contrarily, processed or refined carbohydrates like white spaghetti, sweetened beverages, and desserts have little to no nutritious benefit and therefore to be avoided altogether.

Carbohydrates carry out a variety of essential functions in your body. They are the main source of fuel for your brain's calorific values and give you energy for daily chores.

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Answer:

The number of proton of magnisium = 12

when a compound donates (loses) electrons, that compound becomes Oxidized. such a compound is often referred to as an electron donor.

when a compound accepts (gains) electrons, that compound becomes Reduced. such a compound is often referred to as an electron acceptor.

in glycolysis, the carbon-containing compound that functions as the electron donor is Glucose.

once the electron donor in glycolysis gives up its electrons, it is oxidized to a compound called Pyruvate

5. NAD⁺ is the compound that functions as the electron acceptor in glycolysis.

6. the reduced form of the electron acceptor in glycolysis is NADH

A substance is said to be oxidized when it loses electrons, loses hydrogen, or receives oxygen.

However, the opposite happens with reduction. In other words, when a substance gains electrons, gains hydrogen, or loses oxygen, it is said to be reduced.

A substance that itself is reduced to oxidize another substance is called an oxidizing agent. Redox reactions occur simultaneously. That is, when one substance is oxidized, only another substance is reduced.

During glycolysis, the six-carbon compound glucose (C6H12O6) loses electrons and is finally converted to a three-carbon compound known as pyruvate (CH3COCOOH). In this process, an oxidant called NAD+ receives electrons and is itself reduced to NADH.

The chemical formula for glucose is C6H12O6, while the chemical formula for pyruvate is CH3COCOOH. Looking at their chemical formulas, it is easy to see that glucose has lost hydrogen compared to pyruvate. That means that glucose has been oxidized. Glucose has 12 hydrogens for 6 carbons, but pyruvate has only 4 hydrogens for 3 carbons. This means that glucose was oxidized in the process because the molecule produced, pyruvate, has relatively few hydrogens.

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Answer: all of the above

Explanation: All the choices listed above can be used to describe liquid

The d orbitals involved are the lower-energy, empty orbitals of the metal center (e.g., dxy, dxz, dyz), which can accept the electron density from the ligands. This interaction results in the observed LMCT bands in the spectra.

In this particular system, the additional bands within the spectra correspond to LMCT (ligand-to-metal charge transfer) bands. LMCT occurs when there is an electron transfer from a ligand to a metal ion.

The possible ligands that can contribute to the LMCT bands in this system are those that have lone pairs of electrons and are able to coordinate with the metal ion.

Examples of such ligands include water, ammonia, and halide ions. The d orbitals that are available for interaction in this system depend on the metal ion present.

Generally, transition metals have d orbitals available for interaction. These orbitals can be used to accept the electrons transferred from the ligand during the LMCT process, resulting in the formation of a coordination complex.

The specific d orbitals involved in the interaction will depend on the geometry of the complex and the identity of the ligands involved.

Overall, the LMCT process plays an important role in the formation and stability of coordination complexes in this system.

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Best describes the ball's direction of motion is 50 m and the 'motion of an object is described by its position, speed, direction, and acceleration'

Motion means change with time of the position or orientation of a body

Here given data is barry knocks a baseball into the air with his bat and it is traveling at 25 m/s to east and parallel to ground then the ball is 50 meters to the east of barry so, when first time barry hit the ball, ball goes to parallel of the ground and after two second the ball is at east means 50metre to the barry here the concept is motion of an object is described by its position, speed, direction, and acceleration here the acceleration of the body does not determine its direction of motion the direction of motion is determined by the velocity of the body so 50 m is best describes the ball's direction of motion

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Answer:

B EAST

Explanation:

The motion of an object can be described by its speed, position, and direction of motion.

Two seconds after Barry hits the ball, its speed is 25 m/s, and its position is 50 meters to the east of Barry. This means that the ball's direction of motion is to the east.

Got it in Study Island

There are 3 moles of oxygen are produced when 2 mol of potassium chlorate (KClO3) decompose.

This indicates that 3 moles of oxygen gas are produced for every 2 moles of potassium chlorate that are decomposed. The reaction produces 3 moles of oxygen gas for every 2 moles of potassium chlorate that decomposes. Decomposing 2 moles of potassium chloride KClO3 produces 2 moles of potassium chloride KCl and 3 moles of oxygen O2.

Calculate the number of moles of hydrogen chloride produced from 11 moles of hydrogen. The yield of the reaction is 85%, which means that only 80% of the moles of product released are obtained. To get 3.50 moles of O2, or 85% of No. A mole to protect. Therefore 2.75 mol of KCLO3 is required. The only remaining units are moles of oxygen.

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Answer:

A. It is exothermic

Explanation:

Combustion is a chemical reaction in which a substance combines with oxygen present in air to produce carbon (iv) oxide and water as well release  heat and light energy.Combustion is an exothermic process.

An exothermic reaction releases energy in the form of heat to the surroundings. The energy required to break bonds in the reactants is less than the energy required to form new bonds in the products in an exothermic reaction.

From the given options;

A. It is exothermic is determinable since the reaction is a combustion reaction

B. The bond making energy is more than 600 kJ is not certain because the mass of the wood being burnt is not given. Also, wood is not composed of a specific element that would be taking part in the reaction, rather it is composed of various substances.

C. It is endothermic. is wrong because combustion of wood is exothermic.

D. The bond breaking energy is more than 600 kJ is not certain because the mass of the wood being burnt is not given. Also, wood is not composed of a specific element that would be taking part in the reaction, rather is composed of many substances.

Charles' Law asserts that, with constant pressure, the volume of a gas is precisely proportional to its temperature. The goal of this experiment might be to demonstrate that a gas's volume grows with temperature by measuring the volume of the gas at various temperatures.

According to Charles' Law, for a given mass of gas under a constant pressure, the volume changes in direct proportion to the absolute temperature of the gas. The Kelvin scale is used to measure temperature in absolute terms.

According to Charles' law, an ideal gas's volume under constant pressure is precisely proportional to its absolute temperature. Additionally, the law specifies the Kelvin temperature.

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The heat absorbed when 15.0 g of water freezes is 5.01 kJ.

Chemical reaction or physical change is endothermic if heat is absorbed by the system from the surroundings.

The heat absorbed or released during a phase change can be calculated using the equation q = mL,

where

For the case of 15.0 g of water freezing, the heat absorbed can be calculated as follows:

q = mL

q = (15.0 g) * (6.01 kJ/mol) / (18.015 g/mol)

q = 5.01 kJ

Therefore, the heat absorbed when 15.0 g of water freezes is 5.01 kJ.

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Copper used in electric wires comes in two flavors (isotopes): Cu-63 and Cu-65. Cu-63 has an atomic mass of 62.9298 amu and an abundance of 69.09%. The other isotope, Cu-65, has an abundance of 30.91%. The average atomic mass between these two isotopes is 63.546 amu is 64.93 amu.

Average atomic mass = sum of masses of isotopes multiply by  % of abundance

Cu - 63, mass =  62.9298 amu,   % abundance = 69.09 %

Cu - 65, mass m2 = ?   % abundance = 30.91 %

average atomic mass = 63.546 amu

average atomic mass = ( 62.9298 × 0.6909 ) + ( m2 × 0.3091 )

63.546 =  ( 62.9298 × 0.6909 ) + ( m2 × 0.3091 )

m2 = 64.93 amu

Thus, Copper used in electric wires comes in two flavors (isotopes): Cu-63 and Cu-65. Cu-63 has an atomic mass of 62.9298 amu and an abundance of 69.09%. The other isotope, Cu-65, has an abundance of 30.91%. The average atomic mass between these two isotopes is 63.546 amu is 64.93 amu.

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The pressure at 75°C is 98.3 mmHg.

To solve this problem, we need to use the combined gas law formula, which is:

(P1 x V1)/T1 = (P2 x V2)/T2

Where P1 is the initial pressure, V1 is the initial volume, T1 is the initial temperature, P2 is the final pressure, V2 is the final volume, and T2 is the final temperature.

We are given that the initial pressure (P1) is 84.5 mmHg at a temperature of 25°C, which is 298 K. We want to find the final pressure (P2) at a temperature of 75°C, which is 348 K.

We can set up the equation as follows:
(84.5 mmHg x V1)/298 K = (P2 x V1)/348 K

Simplifying this equation, we can cancel out the volume term:
84.5 mmHg/298 K = P2/348 K

To solve for P2, we can cross-multiply and simplify:
P2 = (84.5 mmHg x 348 K)/298 K
P2 = 98.3 mmHg

Therefore, the pressure of the gas in the closed vessel at 75°C is 98.3 mmHg.

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Answer:Fading is caused by the chemical alteration of unstable dye molecules to a less strongly coloured or colourless form. ... Oxygen and atmospheric water will react with unstable bonds to alter the structure and affect its colour. There is no way to stop an unstable dye from fading

Explanation:

Answer:

replication

:D

I'm not going to lie man, but I really hope that he has a speed-o-meter. That is a pretty good refrence to see if someone is speeding.

Answer:

the speed limit or the ground

Explanation:

Answer:

24.8 atm

Explanation:

For this problem, first identify all of the given quantities, and the requested quantity:

Amount: 67.5 mol

Volume: 71.5 L

Temperature: 47.00 °C

Pressure: ??

Since we are given that the gas is an "ideal gas", we can apply the ideal gas law, which relates all of the above quantities:

\(PV=nRT\), where

For Pressure in units of "atmospheres" and Volume in units of "Liters", \(R=0.0821\frac{L \cdot atm}{mol \cdot K}\)

Recall that to convert Celsius to Kelvin, one must add 273.15 or use the equation \(T_C+273.15=T_K\)

So  \(T_K=(47.00 + 273.15)K=320.15K\), which is the temperature that we'll need for the Ideal Gas Law.

Since the Pressure is the unknown quantity, we can isolate P in the equation before substituting the known values:

\(PV=nRT\)

divide both sides by V...

\(P=\dfrac{nRT}{V}\)

Now, substitute and calculate:

\(P=\dfrac{(67.5~mol)(0.0821\frac{L \cdot atm}{mol \cdot K})(320.15~K)}{(71.5~L)}\)

\(P=24.8138638111888~atm\)

Accounting for significant digits, \(P=24.8~atm\)

The carrying capacity is the maximum number of individuals of a species that an environment can support. Population size decreases above carrying capacity due to a range of factors depending on the species concerned, but can include insufficient space, food supply, or sunlight.

Answer:

As food passes through the GI tract, it mixes with digestive juices, causing large molecules of food to break down into smaller molecules. The body then absorbs these smaller molecules through the walls of the small intestine into the bloodstream, which delivers them to the stomach

Answer:

Food contents that the animal or creature has swallowed goes into the stomach. The contents gets broken down. The energy from the contents will then go through the body.

Answer:

It would be B)

Explanation:

It wont be C because nothing is happening its just being released, but in B its being changed by the UV rays. So this is a chemical change or looks like the best answer out of all these

The ways that the brightness of the flame can be increased are shown below.

By boosting the airflow into the burner, the flame's brilliance can be improved. Increasing the gas flow rate or changing the air intake valve can do this.

Using a gas that generates a brighter flame, like propane or butane, will increase the brightness of the flame. These gases produce a yellow flame because they have a higher carbon to hydrogen ratio than natural gas.

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Answer: Thus 9.75 moles of iron will be required.

Explanation:

The balanced chemical reaction is:

\(2Fe+3O_2\rightarrow 2Fe_2O_3\)  

According to stoichiometry :

2 moles of \(Fe_2O_3\) are produced by= 2 moles of \(Fe\)

Thus 9.75 moles of \(Fe_2O_3\) are produced by=\(\frac{2}{2}\times 9.75=9.75moles\)  of \(Fe\)

Thus 9.75 moles of iron will be required.