Which family of elements is known for their multivalent properties?

Answer:

They have different DNA and different physical appearance

Explanation:

Because if the sperms fertilize two different eggs the DNA will be different too and if the sperms are different the physical appearance will be different also

The standard enthalpy change for reaction (3) is 117.1 kJ.

The standard enthalpy change for reaction (3) can be calculated by using the enthalpy changes of reactions (1) and (2) and applying Hess's Law.

To do this, we need to manipulate the given equations so that the desired reaction (3) can be obtained.

First, we reverse reaction (1) to get the formation of C2H4(g) from C2H6(g):

C2H4(g)C2H6(g) ΔH° = -52.3 kJ

Next, we multiply reaction (2) by 2 and reverse it to obtain 2 moles of C2H6(g) reacting to form 3 moles of H2(g):

2C2H6(g)2C(s) + 3H2(g) ΔH° = 169.4 kJ

Now, we add the two modified equations together:

C2H4(g)C2H6(g) ΔH° = -52.3 kJ
2C2H6(g)2C(s) + 3H2(g) ΔH° = 169.4 kJ

When adding these equations, the C2H6(g) on the left side cancels out with the C2H6(g) on the right side, leaving us with the desired reaction (3):

C2H4(g) + H2(g)C2H6(g) ΔH° = -52.3 kJ + 169.4 kJ = 117.1 kJ

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Answer:

The volume of the steel is 10cm3

Explanation:

Density is defined as the mass contained per unit volume.

Density= Mass

volume

Given : Mass of steel = 80 grams

Density of steel = 8g/cm3

Putting in the values we get:

8g/cm3 = 80g

Volume

Volume=80/8

=10

Thus the volume of steel is 10cm3

Density is an intensive property as it does not depend on the quantity of the substances Whereas mass and volume are extensive property. Therefore, the volume of  sample of steel is 10cm³  if the density of his sample of steel is 8 g/cm³.

Density tells about the compactness of the substances, how much dense is the substances in other words. Object that is more denser than water they just sink in the water.

Mathematically, the formula for density can be given as

Density = Mass of the metal  ÷volume marked on the graduated cylinder

Mass of steel = 80 grams

Density of steel = 8g/cm³

substituting all the given values in the above equation, we get

Volume of steel=80/8

On calculations, we get

Volume of steel  =10cm³

Therefore, the volume of  sample of steel is 10cm³.

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The equilibrium constant of the second reaction is 0.155.

The equilibrium constant is a numerical value that shows the extent to which reactants are converted into products at a given temperature.

Now, we have the reaction; 3Z + Q ⇄ 2 X  and  4 X ⇄ 6 Z + 2 Q.

In the first reaction;

K =[ X]^2/[Z]^3 Q

In the second reaction;

[Z]^6 [Q]^2/[X]^4

Let [ X]^2 = A

[Z]^3 Q = B

Then the second reaction can be;

K = (B)^2/(A)^2 = (B/A)^2

The equilibrium constant of the second reaction therefore is; (1/2.54)^2

K = 0.155

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Answer:

An energy pyramid shows the flow of energy at each trophic level in an ecosystem. A pyramid shape is used because energy is lost at each trophic level when organisms use it up.

Explanation:

The sludge generation process refers to the production of sewage treatment residue during wastewater treatment. Sludge contains solid and semi-solid materials that must be handled and disposed of properly to protect human health and the environment.

The following are some methods for sewage disposal:

Wastewater Treatment: Initial treatment involves the physical removal of large solids, whereas secondary treatment uses biological processes to break down organic matter and remove dissolved pollutants.

Sludge Treatment: The separated sludge is under further treatment, which may include stabilization, dewatering, and, in some cases, additional processes to reduce contaminants.

Land Application: Treated sludge can be applied to agricultural land as a fertilizer or soil conditioner if it meets regulatory guidelines and has been properly treated.

Landfills: If sludge cannot be reused or recycled, it can be disposed of in a designated landfill that meets regulatory requirements, ensuring proper containment and preventing soil and water contamination.

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The final electron acceptor in aerobic respiration is oxygen (O2).The electron transport chain (ETC) in cellular respiration relies on a final electron acceptor to help oxygen get reduced into water. This is why oxygen is considered the final electron acceptor in cellular respiration.

During cellular respiration, glucose is broken down into pyruvate. Pyruvate is then transformed into acetyl CoA and enters the citric acid cycle, where it is oxidized and generates ATP, NADH, and FADH2. The final stage of aerobic respiration involves the electron transport chain, in which electrons from NADH and FADH2 are passed through a series of proteins and coenzymes in the inner mitochondrial membrane, ultimately reducing oxygen to form water.

This process is known as oxidative phosphorylation.In conclusion, the final electron acceptor in aerobic respiration is oxygen (O2), and carbon dioxide is generated in the link reaction (pyruvate oxidation) and the citric acid cycle.

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The synthesis reaction of Br2(g) with Al(s), Ba(s), Ag(s), and Na(s) are as follows:Br2(g) + 2 Al(s) → 2 AlBr3(s)3 Br2(g) + Ba(s) → BaBr6(s)2 Ag(s) + Br2(g) → 2 AgBr(s)2 Na(s) + Br2(g) → 2 NaBr(s)

Balanced equation for the synthesis reaction of Br2(g) with Al(s), Ba(s), Ag(s), and Na(s)Br2(g) + 2 Al(s) → 2 AlBr3(s) 3 Br2(g) + Ba(s) → BaBr6(s) 2 Ag(s) + Br2(g) → 2 AgBr(s) 2 Na(s) + Br2(g) → 2 NaBr(s)The synthesis reaction of Br2(g) can be carried out using different metals such as Al(s), Ba(s), Ag(s), and Na(s). The balanced chemical equation for the reaction will be based on the type of metal used. However, all of the reactions will produce a metal bromide salt.The first equation represents the reaction of Br2(g) with aluminum. This reaction results in the formation of aluminum tribromide salt. The balanced chemical equation for the reaction is as follows:Br2(g) + 2 Al(s) → 2 AlBr3(s)The second equation represents the reaction of Br2(g) with barium. This reaction results in the formation of barium hexabromide salt. The balanced chemical equation for the reaction is as follows:3 Br2(g) + Ba(s) → BaBr6(s)The third equation represents the reaction of Br2(g) with silver. This reaction results in the formation of silver bromide salt. The balanced chemical equation for the reaction is as follows:2 Ag(s) + Br2(g) → 2 AgBr(s)The fourth equation represents the reaction of Br2(g) with sodium. This reaction results in the formation of sodium bromide salt. The balanced chemical equation for the reaction is as follows:2 Na(s) + Br2(g) → 2 NaBr(s)In conclusion, the balanced chemical equations for

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When 3-methylcyclohexene undergoes allylic halogenation with one equivalent of NBS, peroxide, and light, a total of two allylic halides can be formed.

Allylic halogenation is a reaction in which a halogen atom is added to the allylic position of an alkene. In this case, 3-methylcyclohexene is the starting alkene. Allylic positions are carbons adjacent to a double bond.

When 3-methylcyclohexene undergoes allylic halogenation with one equivalent of NBS (N-bromosuccinimide), peroxide, and light, the reaction proceeds via a radical mechanism. The bromine radical generated from NBS abstracts a hydrogen atom from the allylic carbon, forming a new radical intermediate. This radical intermediate can react with NBS to produce an allylic bromide.

In the case of 3-methylcyclohexene, there are two allylic positions available for bromination. The allylic positions are the carbons bearing the methyl group adjacent to the double bond.

Each of these allylic positions can be brominated independently, resulting in two different allylic bromides. Therefore, a total of two allylic halides can be formed when 3-methylcyclohexene undergoes allylic halogenation with one equivalent of NBS, peroxide, and light.

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Answer:

Answer: c.

Explanation:

Liquid. At STP, glucose would be found in the liquid phase because of its ability to form hydrogen bonds. Hydrogen bonds form strong intermolecular forces between molecules, and in the liquid phase, molecules are close enough to form these bonds but still move around each other. Therefore, glucose would likely be found in the liquid phase at STP.

A molecule of glucose can form at least 5 H- bonding interactions. In liquid of matter would you expect it to be found at STP.

At STP (standard temperature and pressure), a molecule of glucose can form at least 5 H- bonding interactions, which allows it to be found in the liquid phase. This is because H-bonds are stronger than other types of intermolecular forces, such as Van der Waals forces, and therefore have a higher boiling point. As a result, glucose molecules are able to remain in the liquid phase at STP, rather than transitioning to the gas phase.

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Answer:

133.333333333 cm^3

Explanation:

Volume = Mass/Density

The conditions for a standard electrochemical cell. select one or more : pressure of 1 atm temperature of 298 k solution concentrations of 1 M.

The electrochemical cell is the cell that is capable of generating the electrical energy from the chemical reactions or by the use of the electrical energy to cause the chemical reaction. The conditions for a standard electrochemical cell. select one or more : pressure of 1 atm temperature of 298 k solution concentrations of 1 M.  

There are the two types of the electrochemical cells is as follows : the galvanic called the electrolytic cells. the galvanic cell is also called as the voltaic cell.

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The ball and stick models of the given molecules are described as follows:

O₂ : two atoms of oxygen linked by double bonds

H₂ : two atoms of hydrogen linked by single bonds

H₂O : two atoms of hydrogen linked to an oxygen atom by single bonds

CO₂ : two atoms of carbon linked to an oxygen atom by double bonds

NH₃ : three atoms of hydrogen linked a nitrogen atom by single bonds

CH₄ : four atoms of hydrogen linked a carbon atom by single bonds

Models are representations of concepts, ideas or substances using pictures, graphs or illustration.

Models are used by scientists to describe processes such as the carbon cycle, water cycle as well as molecules such as oxygen, water, and other chemical substances.

The ball and stick models of the given molecules are described as follows:

O₂ : two atoms of oxygen linked by double bonds

H₂ : two atoms of hydrogen linked by single bonds

H₂O : two atoms of hydrogen linked to an oxygen atom by single bonds

CO₂ : two atoms of carbon linked to an oxygen atom by double bonds

NH₃ : three atoms of hydrogen linked a nitrogen atom by single bonds

CH₄ : four atoms of hydrogen linked a carbon atom by single bonds

In conclusion, a model gives a physical representation of a concept, molecule or event.

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Molar mass

= Atomic mass of Na + Atomic mass of N + Atomic mass of O3

= 23 + 14 + (16×3)

= 23 + 14 + 48

= 85 g per mole

The two main factors that determine the outcome of a chemical reaction in a living cell are direction and rate.

Chemical reactions are absolutely necessary for the production of energy, also known as ATP, in our cells. Energy is essential to the survival of all living things, and ATP is the reactant that fuels the majority of the chemical reactions that take place inside of cells. The production of usable energy by cells is referred to as cellular respiration.

Biochemical reactions are another name for chemical reactions that take place inside of living things. The term "metabolism" refers to the whole of all the biochemical events that take place within an organism. Both exothermic (result in the release of heat) and endothermic (result in the absorption of heat) chemical reactions are involved in the metabolic process.

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Answer:

Saturn

Explanation:

Answer:

Saturn

Explanation:

4Al + 2Pb(No3)2 → 4Al(No3) + Pb2

Hope this helps!

Answer:

because of static energy that's why and gravity

Nuclear fission splits an atom apart, while nuclear fusion fuses two atoms together. Option B.

In nuclear fission, a heavy nucleus or atom splits into smaller and lighter nuclei or atoms. Energy is released during this process as well.

In contrast, nuclear fusion has to do with the coming together of 2 or more light nuclei or atoms to form a single heavy nucleus or atom. This process requires that energy is consumed.

Thus, nuclear fission can be thought of as a process that splits an atom apart, while nuclear fusion fuses two atoms together.

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HEY!

Mayonnaise is an oil in water (O/W) emulsion; ingre- dients are primarily vegetable oil, egg yolk, sodium chloride, water and vinegar. Its relative stability towards microbial spoil- age has been attributed to the high salt content (in the water phase) and low pH, due to the vinegar.

thank me later

carryonlearing

Answer:

We know that,

Density= mass upon volume.

mass= 21.93g

Volume= 49.3 - 46.3

= 3 cm³

Density = 21.93÷ 3

= 7.31 g/cm³

Hope it helps :))

A piece of indium with a mass of 21.93 g is submerged in 46.3 cm³ of water in a graduated cylinder. The water level increases to 49.3 cm³. The correct value for the density of indium measured in g/cm3 from these data is 7.31 g/cm³.

The density of a material is defined as its mass per unit volume. Although the Roman letter D can also be used, the most common symbol for density becomes. Mathematically, density is calculated by dividing weight by volume.

Density is frequently loosely defined as weight per unit volume, which is technically wrong; this quantity is actually more accurately characterized as specific weight. One example is the oil and gas industry in the United States.

Density= mass/volume.

mass= 21.93g

Volume= 49.3 - 46.3

           = 3 cm³

Density = 21.93÷ 3

            = 7.31 g/cm³

Therefore,  7.31 g/cm³ is the density.

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Answer:

Become Visible

Explanation:

Assuming excess zinc, 2.33 moles of hydrochloric acid would produce 645.13 grams of zinc chloride.

The balanced chemical equation for the reaction between hydrochloric acid and zinc is: Zn + 2HCl → ZnCl2 + H2.

The balanced chemical equation for the reaction between hydrochloric acid (HCl) and zinc (Zn) is:

Zn + 2HCl → ZnCl2 + H2

This equation tells us that 1 mole of zinc reacts with 2 moles of hydrochloric acid to produce 1 mole of zinc chloride and 1 mole of hydrogen gas. Therefore, to determine how much zinc chloride is produced when 2.33 moles of hydrochloric acid reacts completely, we need to use stoichiometry.

First, we need to determine how many moles of zinc chloride would be produced from 2.33 moles of hydrochloric acid. From the balanced equation, we know that the ratio of hydrochloric acid to zinc chloride is 2:1. Therefore, the number of moles of zinc chloride produced would be half the number of moles of hydrochloric acid used:

2.33 moles HCl x (1 mole ZnCl2 / 2 moles HCl) = 1.165 moles ZnCl2

Next, we need to convert moles of zinc chloride to grams. The molar mass of zinc chloride is the sum of the atomic masses of one zinc atom and two chlorine atoms:

1 zinc atom x 65.38 g/mol = 65.38 g/mol Zn

2 chlorine atoms x 35.45 g/mol = 70.90 g/mol Cl

Total molar mass = 65.38 g/mol + 70.90 g/mol = 136.28 g/mol ZnCl2

Now we can use this molar mass to convert moles of zinc chloride to grams:

1.165 moles ZnCl2 x 136.28 g/mol ZnCl2 = 158.3 grams ZnCl2

Therefore, 2.33 moles of hydrochloric acid reacting completely would produce 158.3 grams of zinc chloride.

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Answer:

the movement of large amounts of soil and rock debris down a slope

Explanation:

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Elements that belong to the same group of the periodic table (column) have similar properties. This is because elements of the same group have the same amount of valence electrons. This means that chemically and especially in a chemical reaction (or lack thereof), they will behave similarly.

Neon and Krypton are the only two gases in the list given that belong to the same group of the periodic table (Group 18 - Noble Gases) and as such have similar properties.

Similar Properties of Neon and Krypton: