if 24.8 grams of an aqueos solution of chromium(lll) sulfate, cr2(so)3 contains 7.14 grams of chromium(lll)sulfate what is the percentage by mass of chromium(ii) sulfate in the solution

Answer:

B

Explanation:

The muscular and nervous systems enable the involuntary breathing mechanism. The main muscles in inhalation and exhalation are the diaphragm and the intercostals (shown in blue), as well as other muscles. Exhalation is a passive action, as the lungs recoil and shrink when the muscles relax.

Answer:

yes

Explanation:

because hydrogen  can only form these bonds with highly electronegative atoms.

Answer:

No because hydrogen can only form these bonds with highly electronegative atoms.

Answer: C (1)

Explanation:

H is only the element hydrogen.

Answer:

21st century

Explanation:

In order for us to have water to drink, it first needs to go through a process called the water cycle. And in that water cycle there’s a process called evaporation. Evaporation is the process by which water changes from a liquid to a gas. In order for it to rain we need clouds and clouds are made of water.  The water is heated  causing water molecules to convert into gas, that gas then goes through a process called condensation creating clouds. At some point those clouds will be full of water, and all that water will then cause the cloud to release the water molecules causing rain.

The water cycle shows the continuous movement of water within the Earth and atmosphere. It is a complex system that includes many different processes.

There are four main parts to the water cycle:

Evaporation, Convection, Precipitation and Collection.

Evaporation is when the sun heats up water in rivers or lakes or the ocean and turns it into vapor or steam.

The water vapor or steam leaves the river, lake or ocean and goes into the air.

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Answer:

Polonium

Explanation:

Polonium is one of five elements that belong to the chalcogens, or Group 6A elements, which include oxygen (O), sulfur (S), selenium (Se), tellurium (Te), and polonium (Po). Depending on where you're looking, this group can also be called Group 16 or Group VIA - all mean the same thing.

The compound that is likely to be colorless is [Zn(OH2)6]2.

The color of a complex ion depends on the metal ion and the ligands attached to it. Transition metal ions can have partially filled d-orbitals which can absorb certain wavelengths of light and give the complex ion its color. The color of a complex ion can also depend on the arrangement of the ligands around the central metal ion.

In the case of [Zn(OH2)6]2, zinc is a d10 metal ion which means it does not have any partially filled d-orbitals. This means it is not capable of absorbing any wavelengths of light and therefore, it is likely to be colorless. On the other hand, [Cu(OH2)6]2 and [Fe(OH2)6]2 both have partially filled d-orbitals which means they are capable of absorbing certain wavelengths of light and are likely to have color. Therefore, [Zn(OH2)6]2 is the only compound that is likely to be colorless.

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Taking into account the reaction stoichiometry, the volume of O₂ is 7.28406 L when 28.5 g of hydrogen peroxide decomposes to form water and oxygen at 150 degrees c and 2.0 atm.

The balanced reaction is:

2 H₂O₂  → 2 H₂O + O₂

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

By reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The following rule of three can be applied: if by reaction stoichiometry 68 grams of H₂O₂ form 1 mole of O₂, 28.5 grams of H₂O₂ form how many moles of O₂?

moles of O₂= (28.5 grams of H₂O₂×1 mole of O₂)÷68 grams of H₂O₂

moles of O₂= 0.42 grams

Then, 0.42 moles of O₂ are formed.

Ideal gases are a simplification of real gases that is done to study them more easily. It is considered to be formed by point particles, do not interact with each other and move randomly. It is also considered that the molecules of an ideal gas, in themselves, do not occupy any volume.

The pressure, P, the temperature, T, and the volume, V, of an ideal gas, are related by a simple formula called the ideal gas law:

P×V = n×R×T

Where:

In this case, you know:

Replacing in the definition of the ideal gas law:

2 atm×V = 0.42 moles×0.082 (atmL)÷(molK)× 423 K

Solving:

V = (0.42 moles×0.082 (atmL)÷(molK)× 423 K)÷ 2 atm

V= 7.28406 L

Finally, the volume of O₂ is 7.28406 L.

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The more etchings there are in the graduated cylinder, the more precise it is, and the more accurate the liquid measure will be. We should choose the one with more etchings.

When working with liquids, we need to be precise, so we should choose a material that provides us with the necessary to make an accurate measure.

In the laboratory, elements like beakers or flasks should not be used to measure liquids. This is because they do not have a precise measuring scale.

These glasswares are prepared only to make crude measurings. These should not be used for accurately measuring out liquids.

However, there are several appropriate elements that can be used instead. Among them, we can mention graduated cylinders and pipets, volumetric pipets, or burets.

These graduated or volumetric elements have rules with many etchings that can be used to make more precise measurements.

The more etchings there are in the graduated cylinder, the more precise it is, and the more accurate the liquid measure will be.

Note: I do not have the image of the graduated cylinders A and B. But the chosen one should be cylinder with more etchings.

For better understanding, I will attach an image of two cylinders with markings in milliliters.

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Answer:  the number of grams of AgNO3 present in its 7.4 moles is 1257.

Answer:

carbon nuclei...........

Mountains, grassland, forest, desert all are included in the ecosystem

An ecosystem is a geographical region in which plants, animals, and other species, as well as weather and landscapes, collaborate to build a living bubble. Living creatures that have a direct or indirect impact on other species in an ecosystem are referred to as biotic components.

Plants, animals, and microbes, as well as their waste products, are examples. All chemical and physical elements, or non-living components, make up the abiotic components of an ecosystem. Abiotic components can differ from one ecosystem to the next and from one place to the next.

They mostly serve as life supporters. They control and limit the amount, variety, and development of biotic components in an ecosystem.

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Answer:

cutting, bending, dissolving, freezing, and boiling

Explanation:

A physical change is a change in one or more physical properties of matter without any change in chemical properties. In other words, matter doesn't change into a different substance in a physical change. Examples of physical change include but are not limited to, from solid to liquid or from liquid to gas are also physical changes.

When a molecule lacks polar bonds, there is no permanent charge difference between parts of the molecule, and the molecule is nonpolar.

Because the electron charge on both atoms is identical, the Cl2 molecule has no polar bonds. As a result, it is a nonpolar molecule. Hydrocarbons are nonpolar molecular substances because none of the bonds in hydrocarbon molecules, such as hexane, C6H14, are significantly polar.

The molecule is nonpolar if the arrangement is symmetrical and the arrows are of equal length. The molecule is polar if the arrows are of different lengths and do not balance each other. The molecule is polar if the arrangement is asymmetrical.

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Answer:

Explanation:

Silver nitrate grams to moles

1 grams Silver Nitrate is equal to 0.0058867472248402 mole

The valence-shell configuration of the metallic element M in Period 4 is 4s2 4p6.

What is the valence-shell configuration of the metallic element M in Period 4?

The valence-shell configuration refers to the arrangement of electrons in the outermost shell, or valence shell, of an atom. In Period 4, the valence shell of the metallic element M would be the fourth shell, denoted as the 4s and 4p orbitals.

The electron configuration of an element is determined by the position of the element in the periodic table. Since M is in Period 4, we know that it has four electron shells. The valence electrons are those located in the outermost shell, which determine the element's chemical properties and reactivity.

In this case, the valence-shell configuration of M is given as 4s2 4p6, indicating that there are two electrons in the 4s orbital and six electrons in the 4p orbitals. The total number of valence electrons can be calculated as the sum of the electrons in the valence orbitals, which in this case is 8.

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A compound is a substance made up of two or more elements that have chemically joined and can only be broken down chemically into simpler compounds. For instance, pure water is a compound.

Matter with a definite composition and set of characteristics is referred to as a substance. A substance is every pure element. It is a material when it is pure. Substance examples: Because iron is an element, it's also a substance. Methane is both a material and a compound.

There are two different types of pure substances: elements and compounds. One particular type of atom makes up each element, whether it exists on its own or as part of a molecule. Compounds are molecules made up of two simpler things than molecules.

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Answer:

B. Nonmetals

Explanation:

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Answer:

The ice shrinks (decreases volume) and becomes more dense. The ice density will increase from . 92g/cm^3 to that of liquid water (1g/cm^3).

Explanation:

A single electron is present in the valence shell of sodium shown.

What is a valence shell?

In chemistry and physics, the valence electron is an electron that is part of the outer shell of an atom. When the outer shell is open, the valence electron can participate in the formation of a chemical bond. Each atom in a bond contributes a valence electron and forms a common pair in a single covalent bond. The valence shell of an atom refers to its outermost orbit or shell. These electrons are necessary for creating bonds between atoms. It can be filled whole or in part.

So, as you can see from the diagram, we see that there is only one electron in the valence shell.

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Answer

moles = 5.81 mol

Explanation

Given:

Volume = 144 L

AT SATP

1 mole = 24.4651 L

Solution:

1 mole = 24.4651 L

x mole = 144 L

x = 144/24.4651

x = 5.8 mol

Answer:

The answer will be C

Explanation:

Solution A has a pH of 3, and solution B has a pH of 5 "Solution B is less acidic than solution A".

The chemical circumstances of such a solution are reflected by pH, which is an essential quantity. The pH might influence nutritional availability, biological functioning, microbial activity, as well as chemical behavior.

Acidic substances were characterized by a sour flavor. An acid is a molecule that can give an H+ ion while remaining energetically stable.

It is known that if pH ≥7 then solution will be acidic

Hence, solution B is less acidic than solution A.

Therefore, the correct answer will be option (C).

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Answer:

Ca3(PO4)2- Increase in solubility

Barium hydroxide- increase in solubility

Magnesium carbonate- increase in solubility

Copper II sulphide- increase solubility

Lead II bromide- increase solubility

CuI - increase solubility

Explanation:

Calcium phosphate solubility is pH dependent. At lower pH, calcium phosphate is more soluble in water while at pH above 8.5, the solubility of calcium phosphate decreases markedly.

For Barium hydroxide and magnesium carbonate,decreasing the pH will increase the solubility of the compound.

For copper II sulphide,decreasing the pH will lead to a greater solubility. Also, lead II bromide is ordinarily insoluble in water but it's solubility increases with decreasing pH.

CuI is insoluble in water but soluble in dilute hydrochloric acid.

The increase in the pH of the solution increases the solubility of the given ionic compounds such as \(\bold {CuS }\) and \(\bold {CuI}\).

All given compounds are ionic compounds,

Therefore, the increase in the pH of the solution increases the solubility of the given ionic compounds.

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For creating a precise graduation line in the neck of a flask, the most appropriate choice would be a volumetric flask.

The correct option is B.

Volumetric flasks are specifically designed to provide highly accurate measurements of liquid volumes. They have a narrow neck with a single graduation mark, which ensures that the specified volume is accurately measured when the flask is filled up to that mark.

Filter flasks (option a), also known as Büchner flasks, are designed for use with a Büchner funnel and vacuum filtration setup, and they do not typically have graduation marks in the neck.

Florence flasks (option c) and Erlenmeyer flasks (option d) are commonly used in the laboratory, but they are not designed for precise volume measurements. While Erlenmeyer flasks often have graduations, they are not as accurate as those found in volumetric flasks. Florence flasks generally do not have graduations at all.

Therefore, if you require a precise graduation line in the neck of the flask for accurate volume measurements, a volumetric flask would be the most suitable choice.

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Answer:

1. compound

2. observed

3. measured

4. A chemical property

Explanation:

Extra info:

We can further categorize the physical properties of matter as either intensive or extensive

The postulate oh John Dalton's atomic theory that was quickly proved wrong by JJ Thomson and Robert Mullikan was that atoms are indivisible.

Dalton was the first scientist to give a theory about atoms in which he gave several postulates like

1) Atoms of same particles are identical in shape, size and color.

2) Atom is the smallest unit of any matter.

3) Atoms can neither be created nor be destroyed.

4) Atoms of different elements combine with each other in fixed number or ratios to give new molecules.

Although Dalton's model initially got much appreciation but one postulate that is atoms is the smallest unit of any matter which means atoms are indivisible was proved wrong by JJ Thomson through his discovery of of electrons and by Robert Millikan through his discovery of the elementary charge of an electron.

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