Please help Chemistry
What is the percent yield of Fe2S3
if 284 g Fe2S3 are collected, rather
than the 863 g Fe2S3 expected
through calculation?
2FeBr3 +3Na₂S → Fe2S3 + 6NaBr
[ ? ]%

Answer: Galena

Explanation:

(A). Galena

An unidentified mineral that is softer than calcite, exhibits a metallic luster and cubic cleavage. This mineral most likely is galena.

Talc, Gypsum, Calcite, Fluorite, Apatite, Feldspar, Quartz, Topaz, Corundum, and Diamond are just a few examples. - The "Mohs Scale of Mineral Hardness" lists common minerals in order of relative hardness, with talc being the softest and diamond being the hardest mineral. This scale should be familiar to rock hounds and earth science students alike.

When newly broken, galena is a metallic lead grey with a brilliant metallic shine; as it ages, it turns dark grey or black. It is incredibly hefty and fragile (about 7.6 times as heavy as water). Galena often crystallizes in cubic crystals and cleaves into flawless cubic pieces.

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A chemical that releases hydrogen ions into water when coupled with certain metals to form salts.

A substance that, when combined with specific metals, creates salts by releasing hydrogen ions into water. Acids taste sour and cause some colours to turn red. Gastric acid is one of the body's natural acids, and it can support organ function. A substance is considered an acid if it tastes sour in aqueous solution, turns blue litmus paper red, reacts with some metals to release hydrogen, reacts with bases to produce salts, and fosters chemical reactions (acid catalysis).

A chemical that tastes sour and when added to water, produces hydrogen ions is referred to as an acid in science. Acids with a pH lower than 7 will cause litmus to turn red. Any material that when combined with hydrogen ions becomes an acid

weak acid:

HA ↔ H+  + A-

∴ Ka = 5 E-5 M = [H+][A-]/[HA]

∴ [HA] = 0.10 M - [A-]

∴ [H+] = [A-]

⇒ Ka = [H+]²/(0.10 - [H+])

substitute the values in the above equation we get

⇒ [H+]² + 5 E-5[H+] - 5 E-6 = 0

simplifying the above equation, we get

⇒ [H+] = 2.211 E-3 M

⇒ pH = - Log [H+]

⇒ pH = 2.6553

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A) The formula for the molarity of HCl is 1.727*10-2 mol/0.025 L= 0.6908 (M). (B) The amount of HCl that one antacid pill neutralises is (0.01727 -0.0046893) mol = 0.0125807 mol.(C) The gel's volume efficacy is 0.004194/0.01*1000, or 419.4 mL.

An aqueous solution of hydrogen chloride is what is known as hydrochloric acid (HCL), commonly referred to as muriatic acid. It has an unmistakably strong odour and is colourless. It is categorised as a powerful acid. In the digestive tracts of the majority of animal species, including humans, it is a part of the stomach acid. The creation of inorganic and organic chemicals, the removal of metal stains, the extraction of oil, the purification of table salt, and pH control all include the usage of HCl. Acid hydrochloride is an inorganic substance. With the chemical formula HCl, it is a very corrosive acid. Muriatic acid and hydrogen chloride are other names for it.

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A. Multiply - When converting from moles to particles or moles to grams, you must multiply.

Moles are small mammals that are found in many parts of the world. They are burrowing animals that live in underground tunnels and feed on insects, worms, and other small animals. Moles have small eyes and ears, and their fur is usually black or brown. They have large front feet with long claws that help them dig their tunnels. Moles are solitary animals and are active mainly at night. They are important to the environment because they aerate the soil and help control insect populations.

This is because moles are a unit of measurement that represent the number of particles or grams in a given substance. To convert from moles to particles or moles to grams, you must multiply the number of moles by the number of particles or grams in one mole of the substance.

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It is possible to work on composition stoichiometry in your head because the reaction equations in composition stoichiometry are still simple.

A chemical reaction is a process in which one or more substances are converted into one or different substances and produce new products. The characteristics of a chemical reaction are a change in color or smell, gas or precipitate is formed, and there is a change in energy.

Stoichiometry is the science that studies the quantity of a substance in a chemical reaction. These substances include mass, number of moles, volume, and number of particles. In compositional stoichiometry you will understand the quantitative relationship between the masses or the amount of substance between elements in a compound. Like the amount of Nitrogen and Hydrogen substances that combine to form complex ammonia (NH3). So it allows you to calculate it in your brain because the reaction equation is still simple.

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Answer:

the reaction is synthesis When two or more simple compounds combine to form a more complicated one. This is also known as a direct combination reaction.

Explanation:

Dispersion types include chromatic, material, waveguide, and polarisation mode dispersion.

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The chemical entity's atomic number, commonly referred to as the nuclear charge number, is the charging number of an atoms (sign Z). This is the same as the proton amount (pn), which is the number of protons found in typical nuclei.

What is the function of a nucleus?

The nucleus houses the genes, which are parts that contain the genetic material, and regulates and directs the actions of the organism Inside the nucleus, tiny formations known as nucleoli are frequently found. The gel-like matrix where the nuclear components are suspended is known as the nucleoplasm.

How does the nucleus get built?

Atomic nuclei are made up of electrically charged proton and neutral neutrons. These items are held by the strong force, which is the greatest fundamental force that science has discovered.

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There would be 1.67 grams of water are produced if we react 3 moles of hydrogen with 3 moles of oxygen.

First we write the balanced reaction

2H₂ (g) + O₂ (g) → 2H₂O (l)

From the reaction we know that 2 moles of H₂ and 1 mole of O₂  produce 2 moles of 2H₂O. the limiting reactant is hydrogen, so we can use unitary method to calculate the moles of water produced

Moles of water= 2/2 x moles hydrogen

Moles of water = 2/2 x 3 moles = 3 moles

then we can calculate the mass of water produced

Mass water = mass/ mass molar

Mass water = 3 moles / 18 g/mol

mass water = 1.67 gram

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Answer:

to give a fake answer ofc

A concentration cell is a cell in which the two half cells have the same electrodes but have the different concentration. so the correct option is e) none of these.

The concentration cell is the electrolytic cell that is made up of the two half - cells that have the same electrodes but different in the concentration. A concentration cell is dilute the concentrated solution and the concentrate more dilute solution. This creates the voltage when the cell reaches an equilibrium state.

Thus ,  a concentration cell is in which there is the two half cells and having the same electrodes. The concentration is different.

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Answer:

C

Explanation:

Don't think too much. Go with short to the point way... Melting point is always go with lowest point 80.2 degree C

The mass of O2 gas is about 6.9 g.

It is a law which link a gas's pressure, volume, and temperature.

The ideal gas law states that PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvins.

We can use this equation to find the number of moles of gas, and then use the molar mass of O2 to find the mass of the gas.

First, we can rearrange the ideal gas law to solve for n:

n = (PV) / (RT)

We know that P = 0.900atm, V = 21.4L, R = 0.08206 Latm/molK, and T = 257K.

Substituting these values into the equation:

n = (0.900atm * 21.4L) / (0.08206 Latm/molK * 257K)

Now we know the number of moles of O2 gas. To find the mass, we can use the molar mass of O2, which is 32.00 g/mol.

mass = n * molar mass

mass = n * 32.00 g/mol

So, the mass of O2 gas is about 6.9 g.

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Answer:

1.) plastics are poor conductors of heat and electricity

2.) plastics are non reactive metals they are not attacked by chemicals

3.) plastics are lightweight strong and durable

4.) plastics can be moulded and dyed easily in many colours like orange, pink ,sky blue , red, green, and e.t.c

the four uses of plastics are:

1.) bakelite is used to make electric switches insulating casings and handle of cookware and tools

2.) melamine is heat resistant and is used to make kitchenware , floor tiles and special suits for firefighters

3.) Teflon is used as a non stick coating on cookware as both water and oil do not stick to it

4.) many plastics are waterproof and therefore

they are used to make Water bottles and waterproof containers

Explanation:

Search it up bro :')

The four properties of plastics are malleability, longevity, cheapness, and poor conductivity.

Plastics are generally very malleable and can be molded into different shapes very easily. Different types of plastics have different melting points, which enables them to be shaped into different shapes and make objects.

Plastics are generally very durable and have a long shelf life. That is the reason why plastics are used to make things that go through a lot of wear and tear. A negative aspect of this is that plastics, when exposed to natural processes of degradation, do not break down easily and harm the environment.

Plastics are usually cheap and can be obtained at a very less price. This helps people afford goods made out of plastic and also reduces the production cost of the goods.

Plastics are generally very poor conductors of heat and electricity. This means that they do not conduct heat and electricity very well, which is why they are used as insulators and wire coverings.

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Strong heating has no effect on this substance. Long-term storage at room temperature is possible, but it must be kept dry because it interacts fast with moisture and water in the air.

On a large scale, it can be produced via the reaction of silicon or silicon carbide with iodine when heated to roughly 200 °C. The interaction of silane with iodine vapor at temperatures between 130 and 150 °C is of more academic interest because a variety of compounds, including iodosilane SiH3I, diiodosilane SiH2I2, and triiodosilane SiHI3, are produced. The liquid forms of these compounds are colorless at normal temperatures. [3] Iodoform, a related carbon compound that is a yellow solid at ambient temperature, can be easily separated from the final one.

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Answer: Just in case your still stuck, The half-life of iron-59 is 44.5 days, which means that half of the original sample will decay in that amount of time. After 133.5 days, 2.76 g of iron-59 remains. To find the original mass of the sample, we need to know how many half-lives have passed.

133.5 days / 44.5 days/half-life = 3 half-lives

After three half-lives, the remaining mass is 1/8 of the original mass. Therefore,

2.76 g * 8 = 22.08 g

The original mass of the sample was 22.08 grams.

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By the use of rhetorical device, The speaker in "Eulogy of the Dog" uses both pathos and figurative language to make a powerful argument for the importance and loyalty of a dog's companionship.

The speaker evokes a strong emotional response from the audience by describing the unwavering loyalty and devotion of a dog to its master, even in the face of adversity and hardship.

The speaker describes the dog as "the one absolutely unselfish friend that man can have in this selfish world, the one that never deserts him, the one that never proves ungrateful or treacherous." This evokes a sense of sadness and empathy in the audience, as they are reminded of the potential betrayal and unfaithfulness of human relationships.

The speaker was said to have used figurative language to bring the argument to life and make it more relatable to the audience. The speaker describes the dog as "guards the sleep of his pauper master as if he were a prince" and "faithful and true even in death"

In all, the use of pathos and figurative language in the speech helps to create a powerful and emotional argument for the importance and loyalty of a dog's companionship.

The speaker is able to evoke feelings of empathy and sadness in the audience, while also making the abstract concept of loyalty more relatable and tangible.

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Answer: the other guy is correct I got a 90% on that question

Explanation:

The limiting reactant in this reaction is the baking soda (sodium bicarbonate).

A limiting reactant is a reactant in a chemical reaction that is completely consumed before the other reactants. It limits the amount of product that can be formed; the amount of product created is directly proportional to the amount of the limiting reactant present. The term is also known as the limiting reagent. This concept is used in stoichiometry, which is the calculation of the amount of product that can be formed from a given amount of reactants.

This is because it takes more moles of baking soda (NaHCO3) than vinegar (CH3COOH) to cause the reaction to occur. Since there are only 2.5g of baking soda present, it will be used up first and the reaction will stop once all the baking soda has been used.

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Three isotopes of carbon are found in nature: carbon 13, that has 7 neutrons, carbon 14, that has 8 neutrons, and carbon 12, that has 6 particles (plus 6 protons = 12).

A naturally occurring stable isotope that carbon with such a nucleus made up of six protons & seven neutrons is called carbon-13 (13C).

The amount of protons in an element's nucleus determines how it will react chemically.However, the amount or neutrons in the nucleus of different atoms in the same element might vary.

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75% of the surface of the world is covered by water, yet only a small portion of that water, 97% of it being in the oceans, is suitable for use by people, animals, or plants since it is too salty.

Freshwater is defined as water with less than 1,000 milligrams of dissolved particles per liter, most frequently salt. Earth's surface water bodies are often seen as renewable resources because they are a part of the water cycle, despite the fact that they rely heavily on other water cycle components.

Freshwater is defined as water with less than 1,000 milligrams of dissolved particles per liter, most frequently salt. Earth's surface water bodies are involved in the water cycle.

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A substance with a pH of 11 is 10 times more alkaline than a substance with a pH of 1.

The pH is a data that is used as a reference to classify chemical substances according to their alkalinity or acidity. The pH is measured on a scale from 0 to 14 that is divided as follows:

According to the above, it can be inferred that the substance that has a pH of 11 is not more acidic but alkaline. On the other hand, the substance with a pH of 1 is more acidic.

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A nucleotide consists of a nitrogenous base, along with a sugar molecule

A nitrogenous base, a phosphate group, and a sugar molecule with five carbons constitute a nucleotide. The different kinds of nitrogenous bases that can make up a nucleotide are adenine, thymine, guanine, and cytosine. These bases are in charge of the genetic code that is stored in DNA and RNA since they are the base pairs that make up the double helix structure of DNA and the single stranded structure of RNA.

In DNA and RNA, the sugar molecule found within a nucleotide is referred to as deoxyribose. The energy required to power the chemical reactions that build and break the bonds between nucleotides, enabling DNA and RNA to store and transport genetic information, is provided by the phosphate group.

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the oxidation number of the following is a. PO43-: Phosphorus: +5, Oxygen: -2, b. PO33-: Phosphorus: +3, Oxygen: -2, c. HPO42-: Hydrogen: +1, Phosphorus: +5, Oxygen: -2, d. P3O103-: Phosphorus: +5, Oxygen: -2, e. IO3-: Iodine: +5, Oxygen: -2, f. IO2-: Iodine: +4, Oxygen: -2.

g. IO-: Iodine: +1,h. NH4+: Nitrogen: +3, Hydrogen: +1, i. NO2+: Nitrogen: +4, Oxygen: -2, j. NO2-: Nitrogen: +3, Oxygen: -2, k. NO-: Nitrogen: +2, Oxygen: -2, l. NO3+: Nitrogen: +5, Oxygen: -2, m. N2O22-: Nitrogen: +5, Oxygen: -2, n. TeO42-: Tellurium: +6, Oxygen: -2, o. SiO22-: Silicon: +4, Oxygen: -2. The oxidation number (also called oxidation state) of an atom in a chemical compound is a number that represents the degree of oxidation (loss of electrons) of that atom. The oxidation number is assigned based on a set of rules, such as: The oxidation number of an atom in its elemental form is always 0. In a compound, the sum of the oxidation numbers of all atoms must be equal to the charge of the compound (if it is an ion) or 0 (if it is a neutral compound).

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The mass of an additional 0.5% sodium chloride is 2.93×10^23

As an electrolyte replenisher, sodium chloride is used to assist reduce heat cramps brought on by excessive sweating. This drug is also used to make a standard isotonic sodium chloride solution. The chemical formula for the ionic compound sodium chloride, often known as salt, is NaCl, which represents a 1:1 ratio of the ions sodium and chloride. 39.34 g Na and 60.66 g Cl have molar weights of 22.99 and 35.45 g/mol in 100 g of NaCl, respectively. To replace salt and water that have been lost from your body as a result of specific conditions, sodium chloride 23.4% injection is employed (eg, hyponatremia or low salt syndrome). Additionally, it is added to IV fluids that contain carbohydrates and total parenteral nutrition (TPN).

In vulnerable individuals, a high-NaCl diet can increase blood pressure and result in premature mortality. In hypertension, a high-NaCl diet can significantly increase mortality even while it does not further raise blood pressure, in part due to numerous tiny brain infarcts, according to recent research. Salt, commonly known as sodium chloride (NaCl), is a crucial substance that our body uses to transport and absorb nutrients. keep blood pressure steady. maintain the proper fluid equilibrium.

Molecular formula of NaCl is 58.5

58.5gof NaCl=6.023×10^23

28.5g of NaCl= 6.023×10^23÷58.5×28.5

= 2.93×10^23

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A polyatomic ion, often called a molecular ion, is a set of covalently bound atoms or a metal complex that can be thought of as acting as a single unit and has a net charge that is not zero.

Chlorate. ClO₃⁻,Hydroxide. OH⁻,Carbonate. CO₃⁻²,Sulfate. SO₄⁻²,Phosphate. PO₄⁻³,Ammonium. NH₄⁺

Similar to how ions are created when neutral atoms acquire or lose electrons, polyatomic ions are created when neutral molecules gain or lose electrons. Because the total number of electrons in the molecule is more than the total number of protons in the molecule, a polyatomic ion is a collection of covalently bound atoms with a net charge. A polyatomic ion's net charge must be equal to the formal charges added to each of its atoms in the Lewis dot structure.

A molecule that has been ionised by gaining or losing electrons is referred to as a polyatomic ion. The group of atoms that are covalently linked together to form a polyatomic ion has a net charge because the total amount of electrons and protons in the molecule is not equal. When depicting Lewis dot structures, the total charge on a polyatomic ion is equal to the sum of the formal charges on each of the atoms in the ion.

List of Common Polyatomic Ions

[AsO3]3-Arsenate

[BO3]3-Borate

[PO3]3-Phosphite

[PO4]3-Phosphate

[SiO3]2-Silicate

[SO4]2-Sulfate

[SO3]2-Sulfite

[S2O3]2-Thiosulfate

[H2PO4]–Dihydrogen phosphate-

[OH]–Hydroxide

[HSO4]–Hydrogen sulphate

[NO3]–Nitrate

[NO2]–Nitrite

[ClO4]–Perchlorate

[MnO4]–Permanganate

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At pH 7.0, Valine and Tyrosine will both exist in their uncharged forms. The Valine will be drawn as a CH₃CH(NH₂)₂ group and the Tyrosine will be drawn as a C₆H₄CH(OH)CH₂NH₂ group.

Both amino acids will be linked together by a peptide bond, which is a covalent bond that will be formed between the carboxyl group of one amino acid and the amino group of another amino acid. This will create the dipeptide Val-Tyr, which will be drawn as a

CH₃CH(NH₂)CO-C₆H₄CH(OH)CH₂NH₂.

The carboxyl group of Valine will be linked to the amino group of Tyrosine, forming a single molecule.

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You are not required to adjust the subscript in this case because Silver does have a charge value + and Chlorine does have a charge of -. However, because nitrate has a charge of - and calcium has a charge of 2+.

What are some uses for nitrate?

Natural compounds called nitrates (or nitrites) can be found in soil, air, and water. In order to prevent the development of bacteria and also to improve the color and flavor of food, nitrates are also employed as a food additive.

Why is nitrate poisonous?

The main health consequence of nitrate and nitrite exposure is methemoglobinemia. The clinical appearance may be one of oxygen starvation with cyanosis, cardiac arrhythmias and circulation failure, and developing central nervous system (CNS) consequences, depending on the amount of total MetHb [Skold et al.

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Answer:

1. Isotopes are atoms of an element that consist of the same number of protons but a different number of neutrons.

2. No. of protons = 13

 No. of neutrons = 27 - 13

                            = 14

3. refer to attached file

4(a). Since the noble gases can be found in group 18 of the periodic table, it suggests that they have a complete octet (a full valence shell of electrons), and this allows them to be stable gases that show the least reactivity.

4(b). Since the number of protons and electrons are equal in an atom, the opposite charges are balanced and thus, there is no net charge on the atom (neutrons present in the atom have no charge). Hence, an atom is electrically neutral.

5. Mass no. of X = 6 + 6

                           = 12

   Mass no. of Y = 6 + 8

                           = 14

6. mass number = no. of protons in the nucleus of an atom + no. of neutrons in the nucleus of an atom

atomic number = no. of protons in the nucleus of an atom

isobars = atoms of elements which have the same mass number but different atomic numbers

isotopes = atoms of elements which have the same number of protons but a different number of neutrons

Answer:Fe₃O₄

Explanation:It contains 3 molecules of Iron and 4 molecules of Oxygen and that makes Magnetite.

Different types of light can change materials differently because some materials absorb light energy and some reflect light.

When a light wave touches an object, they are either transmitted, reflected, absorbed, refracted, and diffracted, or depending on the material's makeup and the light energy's wavelength.

Usually, materials absorb a few colors of light and reflect others, to different extents, so that they get colored. Some materials will even absorb light of one color and emit light of another color, an effect called fluorescence.

so we can conclude that different materials absorb and reflect an image's light energy.

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