Copper(I) ions in aqueous solution react with NH3(aq) according to Cu+(aq)+2NH3(aq)⟶Cu(NH3)+2(aq) Kf=6.3×1010 Cu + ( aq ) + 2 NH 3 ( aq ) ⟶ Cu ( NH 3 ) 2 + ( aq ) K f = 6.3 × 10^10 Calculate the solubility (in g·L−1) of CuBr(s) ( Ksp=6.3×10^−9 K sp = 6.3 × 10 ^−9 ) in 0.50 0.50 M NH3(aq) NH 3 ( aq ) .

Answer:

C.  physical

Explanation:

A mixture is a physical combination. Mixtures are combinations of compounds and molecules without any chemical reaction taking place.

Mixtures have the following properties:

Familiarizing and determining the reactant and product of a chemical reaction is important because reactant and product are the two main component of the chemical reaction.

All the chemical reactions involves the reactant and product. chemical reactions are comprised of reactant and product. Reactants are substances that start a chemical reaction. Products are substances that are produced in the reaction. The relationship between reactants and products in a chemical reaction can be represented by a chemical equation that has this general form,

          Reactants → Products

The chemical formula allows us to give the scientific name to the substance. The chemical formula allows us to predict the nature and properties of the substance. The chemical formula allows us to write balanced chemical equations.

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To determine the number of grams of Ag2S that could be obtained from the given mixture, we need to calculate the limiting reactant. The limiting reactant is the substance that is completely consumed in a chemical reaction, thereby determining the maximum amount of product that can be formed.

First, we need to convert the masses of Ag, H2S, and O2 into moles using their respective molar masses. The molar mass of Ag is 107.87 g/mol, H2S is 34.08 g/mol, and O2 is 32.00 g/mol.

For Ag:

0.95 g Ag * (1 mol Ag / 107.87 g Ag) = 0.00881 mol Ag

For H2S:

0.140 g H2S * (1 mol H2S / 34.08 g H2S) = 0.00410 mol H2S

For O2:

0.08 g O2 * (1 mol O2 / 32.00 g O2) = 0.00250 mol O2

Next, we compare the mole ratios in the balanced chemical equation to determine the limiting reactant. From the balanced equation, we can see that the ratio of Ag to Ag2S is 4:2. Therefore, the mole ratio of Ag to Ag2S is 4:2, or 2:1.

Since the mole ratio of Ag to Ag2S is 2:1, the limiting reactant is Ag. Therefore, the moles of Ag2S that could be obtained are equal to half the moles of Ag.

0.00881 mol Ag * (1 mol Ag2S / 2 mol Ag) = 0.00441 mol Ag2S

Finally, we calculate the mass of Ag2S using its molar mass, which is 247.80 g/mol.

0.00441 mol Ag2S * (247.80 g Ag2S / 1 mol Ag2S) = 1.09 g Ag2S

Therefore, from the given mixture, it is possible to obtain approximately 1.09 grams of Ag2S.

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The molar mass of the metal that has a face-centered cubic lattice is 100.74 g/mol.

The edge length of the cube is calculated from the formula below

where;

a is edge-length

r is the radius of the atom = 0.134 nm or 0.134 * 10⁻⁷ cm

a = 4 *  0.134 * 10⁻⁷ cm / √2

a = 3.79 * 10⁻⁸ cm

The atom of the metal has a face-centered cubic lattice.

Volume of cube = a³

Volume of the atom = (3.79 * 10⁻⁸cm)³

Volume of atom = 5.44 * 10⁻²³ cm³

Molar mass of the metal = density * Avogadro number * volume / z

where z is the number of atoms in a unit cell = 4

Molar mass of the metal = 12.3 gcm⁻³ * 5.44 * 10⁻²³ cm³ * 6.02 * 10²³ mol⁻¹ / 4

Molar mass of the metal =100.74 g/mol

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The percentage composition of Pb and Cl₂ is 74.5% and 25.5% respectively in PbCl₂.

A simple concept is percent composition. The mass percentage of each element in a compound is indicated by its percent composition. The fusion of two or more elements results in a chemical compound.

If you are researching a chemical compound, you might be interested in learning what percentage of that compound contains a particular element. (Mass of Element/Molecular Mass) x 100 is the formula for percent composition.

The mass of Pb is 207.2

The mass of Cl2 is 70.906, since the mass is 35.453 and we have two of them.

When we add it together, the total mass of PbCl2 is 278.106, all we need to do is add the two masses we calculated before, together!

The formula for percent composition is:

\(\frac{element\\mass}{compound\\mass} \times 100\)

Lets calculate the percentage of Pb

(207.2/278.106) × 100

= 74.5%

The percentage compositions of Pb is 74.5%

Lets calculate the percentage of Cl₂

(70.906/278.106) × 100

= 25.5%

Thus, the percentage composition of Pb and Cl₂ is 74.5% and 25.5% respectively in PbCl₂

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Answer:

A. 7

(assuming the water is neutral)

Explanation:

the first question's answer is a

the second question's answer is c

Yes, the law of conservation of mass holds true in this case. When 123.6 g of copper carbonate was heated, 79.6 g of black residue was formed, and the total mass remained the same, which is 123.6 g.

What is law of conservation?

The law of conservation states that energy, mass and momentum can not be created or destroyed, only converted from one form to another. This means that the total amount of these three concepts remain constant in a closed system. This law is one of the fundamental laws of physics.

Therefore, Yes, the law of conservation of mass holds true in this case. When 123.6 g of copper carbonate was heated, 79.6 g of black residue was formed, and the total mass remained the same, which is 123.6 g.

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The isotope sulfur-32 refers to an atom of sulfur with a mass number of 32. Sulfur-32 has a total of 16 protons (nucleons) and 16 neutrons (nucleons), resulting in a sum of 32 nucleons in the sulfur-32 isotope.

The mass number represents the total number of nucleons (protons and neutrons) in the nucleus of an atom.

To determine the number of nucleons in sulfur-32, we look at the atomic number of sulfur, which is 16. The atomic number signifies the number of protons in the nucleus. Since the atom is electrically neutral, the number of protons (16) is also equal to the number of electrons.

To find the number of neutrons, we subtract the atomic number from the mass number. In this case, subtracting 16 from 32 gives us 16 neutrons.

Therefore, sulfur-32 has a total of 16 protons (nucleons) and 16 neutrons (nucleons), resulting in a sum of 32 nucleons in the sulfur-32 isotope.

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Answer:

Homogeneous

Explanation:

Pure substances are untouched substances.

Homogeneous mixtures are in uniform.

Heterogeneous mixtures are un-uniform.

In this reaction the oxidation number of hydrogen increases that is oxidation of hydrogen and the reduction of Copper occurs.

Any chemical process in which a participating chemical species' oxidation number changes is an oxidation-reduction reaction, often known as a redox reaction.

It is also clear that this is a reduction reaction because the oxidation number for copper decreases from +2 in Cu2+ to 0 in copper. Since oxidation involves the loss of electrons, 2H2O is oxidized when it loses 4 electrons to create O2.

The given reaction is :

CuO + H₂ = Cu + H₂O

in this reaction the oxidation number of hydrogen increases that is oxidation of hydrogen and the reduction of Cu occurs.

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Answer:

Both in group 1

Explanation:

Sodium is a very reactive metal

Chlorine is a very reactive non metal

Both have one Valence electron

Magnesium and fluorine atoms will most likely form an ionic bond.

Ionic bonds are formed between elements with a large difference in electronegativity, which is the measure of an atom's ability to attract electrons towards itself. Magnesium and fluorine have a difference in electronegativity of 2.13, which is large enough to form an ionic bond.

In ionic bonds, one atom loses electrons and becomes a positively charged ion (cation), while the other atom gains electrons and becomes a negatively charged ion (anion). In this case, magnesium will lose two electrons to become Mg2+ and fluorine will gain one electron to become F-. These two ions will then attract each other electrostatically to form magnesium fluoride (MgF2), which is an ionic compound.

On the other hand, covalent bonds are formed between elements with a small difference in electronegativity, where atoms share electrons to achieve a stable electron configuration. Magnesium and fluorine have a large electronegativity difference, so they are unlikely to share electrons and form a covalent bond. Therefore, magnesium and fluorine will most likely form an ionic bond.

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1) A. individual salt crystals

2) A. increases

3) A. increases

hope this helps :)

A solution is defined as the homogeneous mixture which contain one or more solutes in a solvent. The factors which affect the solubility are temperature and pressure. Here individual salt crystals dissolve faster.

The maximum amount of solute which can dissolve in a given quantity of the solvent at a certain temperature is defined as the solubility. It is defined as the property exhibited by a material to dissolve in a given solvent.

The powdered salt found to dissolves faster in a solvent than the salt of larger size. The rate of dissolving is affected by the size of the solute. The faster the solute dissolves if its size is smaller. So the  individual salt crystals dissolves faster.

In most cases, generally the solubility found to decrease with the increase of temperature. When the temperature increases, the kinetic energy of the molecules increases and thereby decreases the intermolecular force of attraction. The increase in the process of agitation decreases the solubility.

1. The correct option is A

2. The correct option is B

3. The correct option is B

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The molar concentration of a solution is determined by dividing the number of moles of solute by the volume of the solution in liters.

To find the molar concentration of the sugar solution, we need to follow these steps: Convert the mass of sugar from grams to moles. We can use the molar mass of sugar (342.30 g/mol) to calculate this.
MASS = 79.1 g
Molar mass of sugar = 342.30 g/mol
Number of  = MASS / Molar mass
Number of moles = 79.1 g / 342.30 g/mol
Convert the volume of the solution from milliliters to liters.
VOLUME = 264.0 mL
Volume in liters = VOLUME / 1000
Volume in liters = 264.0 mL / 1000
The molar concentration of the sugar solution is X mol/L.

Then we convert the volume of the solution from milliliters to liters. Finally, we divide the number of moles of sugar by the volume of the solution in liters to calculate the molar concentration. The molar concentration of a solution represents the amount of solute present per unit volume of the solution. In this case, we are calculating the molar concentration of a sugar solution.

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Answer:

neutrons, protons

Explanation:

Answer:

Option A

Option B

Explanation:

It isn't option D because electrons are on the outside of the nucleus of the atom, and it isn't option C because isotopes are usually the same elements but with different amounts of neutrons while having the same number of protons. Leaving options A and B or "neutrons and protons" as your answer and that's because neutrons and protons are always found in the center of the nucleus which also helps determine the element.

Hope this helps.

Answer:

make sure that nothing is damaged

Explanation:

check to see if the wire is split, if the lens is cracked, etc...

Scientist are able to see smaller cells due to the large scale of magnification of new microscopes.

The term cell refers to the simplest or the smallest unit of an organism. All organisms are composed of cells and cells come from cells. This implies that cells come from the replication of cells in the body.

Now, there are several kinds of microscopes that are in existence such as;

The scale of microscopes continue to improve as technology improves. Thus we have larger magnification and scientist are able to see smaller cells due to the large scale of magnification of new microscopes.

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Answer:

3 parts

Explanation:

Eukaryotic cells have 1) a membrane-bound nucleus; 2) numerous membrane-bound organelles and 3) several, rod-shaped chromosomes.

Answer:

The biome concept organizes large-scale ecological variation. Terrestrial biomes are distinguished primarily by their predominant vegetation, and are mainly determined by temperature and rainfall.

Terrestrial Biomes

Differences in temperature or precipitation determine the types of plants that grow in a given area (Figure 1). Generally speaking, height, density, and species diversity decreases from warm, wet climates to cool, dry climates. Raunkiaer (1934) classified plant life forms based on traits that varied with climate. One such system was based on the location of the perennating organ (Table 1). These are tissues that give rise to new growth the following season

Answer:

size and shape because solids nomally have a fixed shape and volume

I think it would be, C. Size and Shape.

Because, when measuring objects in solids u should measure the Size because the color is just paint and the texture is just how it feels. The shape can be measured in solids too.

So, your answer is C.

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The brain chemicals known as endorphins produce effects similar to opioids.

Opioids are a class of drugs that act on opioid receptors in the brain and produce pain relief, euphoria, and a sense of well-being.

Endorphins are natural neurotransmitters that are produced by the body in response to various stimuli, such as exercise, laughter, and certain foods.

When endorphins are released, they bind to opioid receptors in the brain, leading to feelings of pleasure and pain reduction. This is why endorphins are often referred to as the body's natural painkillers. Similar to opioids, endorphins can produce a sense of euphoria and an overall improvement in mood.

The release of endorphins is commonly associated with exercise. During physical activity, endorphins are released, which can result in a phenomenon known as the "runner's high." This is a feeling of euphoria and increased well-being that is often reported by long-distance runners.

In addition to exercise, other activities that can stimulate endorphin release include laughter, socializing, and certain types of foods, such as dark chocolate and spicy foods. These activities can promote feelings of happiness, relaxation, and pain relief, similar to the effects of opioids.

In summary, endorphins produce effects similar to opioids, including pain relief, euphoria, and an overall sense of well-being. They are natural chemicals produced by the body in response to various stimuli, such as exercise, laughter, and certain foods.

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Answer:

The presence of a brightly colored, detachable tail can be advantageous for some lizards because it serves as a distraction or decoy for predators. When a predator attacks, the lizard can quickly detach its tail, which wriggles and continues to move for a short period of time. This sudden movement can divert the predator's attention away from the lizard's body, allowing the lizard to escape.

The bright coloration of the tail can also help to draw the predator's attention towards it, instead of the lizard's body. Bright colors are often used in the animal kingdom as warning signals, indicating that an animal is toxic or dangerous. While the lizard may not necessarily be toxic or dangerous, the bright colors of its tail can create a similar effect, deterring predators from attacking in the first place.

Additionally, the detachable tail can serve as a form of self-defense, allowing the lizard to escape from a predator's grasp. By detaching its tail, the lizard can leave the predator with a distraction while it makes its escape. Over time, the lizard can regrow its tail, allowing it to continue to use this defense mechanism in the future.

Answer:

A. Protons

Explanation:

For an atom to be neutral, it must have the same number of electrons as protons. Since protons are positive and electrons are negative, that will result in a neutrally charged atom.

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Sodium Hydroxide can be used to help an amine elute. Ammonium hydroxide can be used to help an amine elute. Sodium bicarbonate can help an acid elute. Mixed ethanoic acid to help an acid elute.

The manner in which mobile phase strength varies with various co-solvents. The quickest and most potent co-solvent for eluting analytes is methanol. In contrary to acetonitrile, which is the weakest of the three CC co-solvents and holds analytes the longest, isopropyl alcohol is worse than methanol but stronger than acetonitrile.

Stronger solvents decrease retention and elute analytes more rapidly in other modes of chromatography, which also display this relative type of chromatographic behaviour. In CC, various co-solvents can be combined to vary the solvent strength and retention.

The results of a gradient separation of metoclopramide and associated contaminants using methanol and acetonitrile as weaker co-solvents. Longer retention durations are the result of a decrease in solvent strength as methanol concentration increases in response to an increase in acetonitrile concentration.

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The weight of each stopper can vary based on the material, size, and manufacturing process used, so it is not possible to determine the number of rubber stoppers needed without more information.

Weight is a measure of the force of gravity on an object and is typically measured in units of Newtons (N), pounds (lb), or kilograms (kg).

Average weight, on the other hand, refers to the sum of the weights of a group of objects divided by the number of objects in the group. It provides an estimate of the typical or central value of the weights in the group. The units of average weight are the same as the units used to measure weight.

The number of rubber stoppers needed to contain the same number of stoppers as there are corks in 1.0 kg of corks would depend on the average weight of each type of stopper.

The weight of each stopper can vary based on the material, size, and manufacturing process used, so it is not possible to determine the number of rubber stoppers needed without more information.

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The ideal gas law is the state equation of a hypothetical ideal gas. The volume of the nitrogen gas is 51 I.

The general gas equation, commonly known as the ideal gas law, is the state equation of a hypothetical ideal gas. The ideal gas equation is formulated as:

PV = nRT

In this equation, P refers to the pressure of the ideal gas, V is the volume of the ideal gas, n is the total amount of ideal gas that is measured in terms of moles, R is the universal gas constant, and T is the temperature.

As it is given that the pressure on the nitrogen is 720 torr, the temperature of the gas is 20°C(293 k), and the moles of nitrogen are 2.0 moles. Therefore, using the ideal gas equation the volume of the nitrogen can be written as,

\(pv=nRT\\\\v = \dfrac{nRT}{p}\\\\v = \dfrac{2 \times 62.396 \times 293}{720}\\\\v = 50.7834 \approx 51\)

Thus, the volume of the nitrogen gas is 51 I.

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Answer:

answer in picture

Explanation:

Answer:

There was a chemical reaction

Explanation:

there was bubbles on the side of the flask

Answer:

2.47L

Explanation:

Using the combined gas law equation as follows:

P1V1/T1= P2V2/T2

Where;

P1 = initial pressure (mmHg)

P2 = final pressure (mmHg)

V1 = initial volume (L)

V2 = final volume (L)

T1 = initial temperature (K)

T2 = final temperature (K)

According to the information provided in this question;

P1 = 705mmHg

P2 = 760mmHg (STP)

V1 = 3.00L

V2 = ?

T1 = 35°C = 35 + 273 = 308K

T2 = 273K (STP)

Using P1V1/T1= P2V2/T2

705 × 3/308 = 760 × V2/273

2115/308 = 760V2/273

Cross multiply

308 × 760V2 = 2115 × 273

234,080V2 = 577,395

V2 = 577,395 ÷ 234,080

V2 = 2.47L