i. TRUE OR FALSE STATEMENTS

state whether the following statements are true or false and correct the false statements

1. Atoms of all elements follow octate rule.

2. All the electrons in atoms are termed as valance electron.

3. The ionic bond is not-directional.

4. Ionic compound exist in crystalline form.

5. Covalent compounds have low melting points.

6. All covalent compounds exist as giant aggregates.

7. Covalent bond is formed due to mutual sharing of electrons.

8. Covalent compounds are good conductors of electricity.​

Explanation:

The periodic table brings order to information about the chemical elements. It helps chemists to understand why elements react as they do. Elements in the same group have similar chemical properties. This is because they have the same number of outer electrons and the same valency

The molar solubility of AuCl₃ in a 0.013 M solution of magnesium chloride is 1.81×10⁻²⁸M.

The solubility product constant, Ksp, is the equilibrium constant for a solid substance dissolving in an aqueous solution. And for the AuCl₃, Ksp will be written as: Ksp = [Au³⁺][Cl⁻]³

Let the solubility of the AuCl₃ in 0.013M solution of magnesium chloride is x, of Au³⁺ is x and of Cl⁻ is 3x. But we know that MgCl₂ is a strong electrolyte and it completely dissociates into its ions and will produce 2 moles of chloride ions. For this solution let we consider the volume is 1 liter then the concentration of chloride ions in MgCl₂ is 2(0.013)=0.026M.

So, in MgCl₂ solution concentration of Cl⁻ becomes = 3x + 0.026.

Value of Ksp for AuCl₃ = 3.2 × 10⁻²³

On putting all values on the Ksp equation, we get

Ksp = (x)(3x + 0.026)³

Value of 3x is negligible as compared to the 0.026, so the equation becomes

3.2 × 10⁻²³ = (x)(0.026)³

x = 3.2×10⁻²³ / (0.026)³

x = 1.81×10⁻²⁸M

Hence the molar solubility of AuCl₃ in 0.010M MgCl₂ is 1.81×10⁻²⁸M.

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The experimental approach used to analyze the metal content in the precipitate of soap produced by reaction 1 was 0.1 M HCl(aq), then titrated with standard 0.1 M NaOH(aq) using an indicator.

Soap precipitate is a salt of a weak base. The addition of HCl produces free fatty acids, which can then be neutralized with NaOH. The difference between the number of moles of HCl and NaOH required to reach the endpoint gives the number of moles of RCO₂, which can then be used to calculate the mass and percent of the metal in the solid.

Complete questions:

Which experimental approach can be used to analyze the metal content of the soapy precipitate produced by Reaction 1?

M₂+(aq) + 2NaC₁₇H₃₂CO₂(aq) → 2Na+(aq) + M(C₁₇H₃₂CO₂)₂(s)

Dissolve the solid in a known volume of:

The true choice is D

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1.  the final concentration of NaOH after adding 125 mL of water to 45.3 mL of 0.71 M NaOH solution is approximately 0.189 M.

2.  the final concentration of KOH after adding 550 mL of water to 125 mL of 3.01 M KOH solution is approximately 0.557 M.

1.) If 125 mL of water is added to 45.3 mL of a 0.71 M NaOH solution, the resulting solution will be a diluted NaOH solution. The addition of water will increase the total volume while reducing the concentration of NaOH. To determine the final concentration of NaOH, we need to consider the conservation of moles.

First, let's calculate the moles of NaOH in the initial solution:

moles of NaOH = volume (in L) × concentration (in M)

moles of NaOH = 0.0453 L × 0.71 M = 0.0321433 moles

After adding 125 mL (0.125 L) of water, the total volume of the solution becomes 0.0453 L + 0.125 L = 0.1703 L.

To find the final concentration, we divide the moles of NaOH by the total volume:

final concentration of NaOH = moles of NaOH / total volume

final concentration of NaOH = 0.0321433 moles / 0.1703 L ≈ 0.189 M

Therefore, the final concentration of NaOH after adding 125 mL of water to 45.3 mL of 0.71 M NaOH solution is approximately 0.189 M.

2.) If 550 mL of water is added to 125 mL of a 3.01 M KOH solution, the resulting solution will also be a diluted solution. Again, we will apply the conservation of moles to determine the final concentration of KOH.

First, calculate the moles of KOH in the initial solution:

moles of KOH = volume (in L) × concentration (in M)

moles of KOH = 0.125 L × 3.01 M = 0.37625 moles

After adding 550 mL (0.55 L) of water, the total volume of the solution becomes 0.125 L + 0.55 L = 0.675 L.

To find the final concentration, divide the moles of KOH by the total volume:

final concentration of KOH = moles of KOH / total volume

final concentration of KOH = 0.37625 moles / 0.675 L ≈ 0.557 M

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Answer:

V = 20.1 L

Explanation:

Given data:

Volume of flask = ?

Number of moles of nitrogen gas = 0.730 mol

Pressure = 698 mmHg (698/760 = 0.92 atm)

Temperature = 35.4°C

Solution:

The given problem will be solve by using general gas equation,

PV = nRT

P= Pressure

V = volume

n = number of moles

R = general gas constant = 0.0821 atm.L/ mol.K  

T = temperature in kelvin

Now we will convert the temperature.

35.4+273 = 308.4 K

by putting values,

0.92 atm× V = 0.730 mol ×0.0821 atm.L/ mol.K × 308.4 K

V = 18.48 atm.L / 0.92 atm

V = 20.1 L

The answer is 67 108.0888km/s.

You would need approximately 5.41475 grams of HgO to produce 0.0125 moles of O2 according to the given equation.

To determine the amount of HgO (mercury(II) oxide) needed to produce 0.0125 moles of O₂ according to the given balanced equation, we need to use the stoichiometric coefficients as conversion factors.

From the balanced equation:

2 moles of HgO produce 1 mole of O₂.

Number of moles of O₂ = 0.0125 mol

Using the stoichiometric ratio, we can set up the following conversion:

0.0125 mol O2 * (2 mol HgO / 1 mol O2) = 0.025 mol HgO

To convert from moles to grams, we need to know the molar mass of HgO.

The molar mass of HgO is:

Atomic mass of Hg = 200.59 g/mol

Atomic mass of O = 16.00 g/mol

Molar mass of HgO = (200.59 g/mol) + (16.00 g/mol) = 216.59 g/mol

Now we can calculate the mass of HgO:

0.025 mol HgO * (216.59 g HgO / 1 mol HgO) = 5.41475 g

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A student proposes the following lewis structure for the peroxide ion.

what is formal charge?

A hypothetical charge that might be present on an atom in a molecule is known as a formal charge. It makes the corresponding polarity assumption that sharing electrons are equally spaced from the parent atoms. Polarity is the presumption that, unless parent atoms are identical, such as H-H, electrons are never equally distant from them.

For a polyatomic ion, the formal charges must add up to the ion's charge rather than the sum of the formal charges on all the atoms in the molecule (which may be positive or negative). Formal Charge = [Valence electron count in a single atom] - [(number of bonding electrons) 12 (number of lone pair electrons)]

The peroxide has a formal charge of -2.

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Answer:

A

Explanation:

A sorry if not correct

Answer:

375.8 × 10²³ molecules

Explanation:

Given data:

Number of molecules of acetylene = ?

Volume of cylinder = 1400 L

Temperature = standard = 273.15 K

Pressure = standard = 1 atm

Solution:

The given problem will be solve by using general gas equation,

PV = nRT

P= Pressure

V = volume

n = number of moles

R = general gas constant = 0.0821 atm.L/ mol.K  

T = temperature in kelvin

PV = nRT

1 atm × 1400 L = n ×  0.0821 atm.L/ mol.K    × 273.15 K

1400 L.atm = n × 22.43  atm.L/ mol

n = 1400 L.atm / 22.43  atm.L/ mol

n = 62.4 mol

1 mole contain 6.022 × 10²³ molecules

62.4 mol × 6.022 × 10²³ molecules / 1 mol

375.8 × 10²³ molecules

To make up 1 L of a 0.5 M solution of EDTA starting with the free acid, the pH must be adjusted to 7.0. EDTA is a weak acid with a pKa of 2.0, 2.67, 6.16, and 10.26 for the four acetic acid groups.

At a pH of 7.0, EDTA will exist in a buffered state, meaning that it will be partially protonated and partially deprotonated.

To adjust the pH of the EDTA solution to 7.0, an alkali solution such as 10 M NaOH must be added. The amount of NaOH required can be calculated using the Henderson-Hasselbalch equation:

pH = pK a + log([base]/[acid])

where [base] is the concentration of the deprotonated form of EDTA and [acid] is the concentration of the protonated form of EDTA.

At a pH of 7.0, the acid-base equilibrium of EDTA will be:

[EDTA-] = [HEDTA]

At this pH, the buffer capacity is high. Since the pKa of EDTA is close to the desired pH, the buffer will resist changes in pH caused by added acids or bases.

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Some environmental problems human population growth poses are:

Maintainable resource management: Executing maintainable hones to oversee assets viably and minimize squander. This incorporates receiving renewable vitality sources, advancing water preservation, and practicing mindful farming and ranger service.

Preservation and conservation of ecosystems: Ensuring and reestablishing normal habitats, building up ensured ranges, and advancing economical land-use hones to protect biodiversity and avoid environment misfortune.

Education and awareness: Advancing natural instruction and mindfulness to cultivate economical ways of life and behavior alter. Teaching people around the affect of their choices on the environment can lead to more maintainable utilization designs.

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981 grams of nitric acid, HNO3, yields 15.57 moles of magnesium nitrate.

A chemical reaction is the chemical change of one set of chemical components into another. A chemical reaction is a process that converts one or more compounds, known as reactants, to one or more distinct substances, known as products. Chemical elements or compounds are examples of substances. Chemical reactions are the processes through which a material or substances undergo a chemical shift to form a new substance or substances with entirely new attributes.

Here,

According to the reaction above, one mole of Magnesium Nitrate is produced from 2 moles of Nitric Acid

1 mole of Mg(NO3)2/2 moles of HNO3

981 grams of Nitric acid contains

981 g * 1 mole/63 g of Nitric Acid = 15.57 moles

15.57 moles of magnesium nitrate are produced from 981 grams of nitric acid, HNO3.

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We think that our dependency is primarily on non-renewable energy sources because these resources are required and important for our daily lives.

We depend on non-renewable energy for example fossil fuels resource because of the reason that they are energy-rich and comparatively cheap to process. But a big problem with fossil fuels resource, apart from them being in limited supply, is that burning them releases carbon dioxide into the atmosphere.

We think today that humanity's use of fossil fuels resource is damaging our environment. Fossil fuels resource which is non-renewable energy cause pollution where they are produced and used, and their continuous use is causing long-term harm to the climate of our planet.

So we can conclude that our dependence on nonrenewable energy sources makes sense because our lives depend on them.

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K (s) + ZnCl (aq) ====》 KCl ( aq) + Zn (s)

The name of binary ionic cpd composed of the lithium cation and the chlorine anion is called Lithium chloride (LiCl). In Chemistry, the lithium chloride is an ionic compound consisting of lithium and chlorine.

It has a white or colourless solid structure in the form of a crystal. The lithium chloride formula is LiCl. It is a compound that is highly soluble in water and its solutions conduct electricity. Lithium chloride is used as a desiccant, a flux for welding and soldering, and a starting material in the synthesis of various other lithium compounds.

It is also used as an important reagent in organic synthesis. It is also useful in the production of ceramics and in the manufacture of lithium-ion batteries. In conclusion, the name of the binary ionic cpd consisting of the lithium cation and chlorine anion is Lithium chloride (LiCl).

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In chemical reactions, there are open-chain compounds and closed-chain compounds. (Answer look at the picture)

Open-chain compounds (Aliphatic) are carbonate compounds with chains that do not meet between ends, saturated or unsaturated both branched and unbranched.

Closed-chain compounds is a term in chemistry used for compounds whose atoms are joined together to form rings. The number of elements making up the ring varies and is more than three. The elements that make up the cycle are also different from the elements carbon (carbon cycle), elements other than carbon (inorganic cycle), or both (heterocyclics).

Cyclic compounds can be called aromatic if they meet several conditions, namely:

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The five scientists who contributed to the discovery of the cell are Robert Hooke, Antonie van Leeuwenhoek, Matthias Schleiden, Theodor Schwann, and Rudolf Virchow.

The discovery of the cell as the fundamental unit of life involved the collective efforts of several scientists. Robert Hooke, an English physicist, was the first to observe and name cells while examining cork under a microscope in 1665.

Around the same time, Antonie van Leeuwenhoek, a Dutch scientist, improved microscopes and made detailed observations of various microorganisms, further advancing our understanding of cells.

In the mid-19th century, Matthias Schleiden, a German botanist, proposed that all plants are composed of cells, and Theodor Schwann, a German zoologist, extended this concept to animals.

Their combined work led to the formulation of the Cell Theory, which states that cells are the basic building blocks of all living organisms.

Rudolf Virchow, a German physician, later contributed to the development of the Cell Theory by emphasizing the idea that cells arise only from pre-existing cells, rejecting the notion of spontaneous generation. Virchow's work highlighted the significance of cell division and its role in growth, development, and disease.

Through their cumulative efforts, Hooke, van Leeuwenhoek, Schleiden, Schwann, and Virchow made significant contributions to our understanding of cells, paving the way for modern cell biology and numerous advancements in the field of life sciences.

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Answer:

the particles start to spread out and cause it to get warmer

Explanation:

Answer:

A reactant is a substance that is present at the start of a chemical reaction. A product is a substance that is present at the end of a chemical reaction.

Explanation:

Answer:

Earth Science?

Explanation:

its not marine science or life so its physical or earth

The mass of water, H₂O produced from the reaction is 72.06 g

We'll begin by calculating the mass of NH₄NO₃ that reacted and the mass of H₂O produced from the balanced equation.

NH₄NO₃ —> N₂O + 2H₂O

Molar mass of NH₄NO₃ = 80.03 g/mol

Mass of NH₄NO₃ from the balanced equation = 1 × 80.03 = 80.03 g

Molar mass of H₂O = 18.01 g/mol

Mass of H₂O from the balanced equation = 2 × 18.01 = 36.02 g

From the balanced equation above,

80.03 g of NH₄NO₃ reacted to produce 36.02 g of H₂O

Finally, we shall determine the mass of H₂O produced by the reaction of 160.1 g of NH₄NO₃.

From the balanced equation above,

80.03 g of NH₄NO₃ reacted to produce 36.02 g of H₂O.

Therefore,

160.1 g of NH₄NO₃ will react to produce = (160.1 × 36.02) / 80.03 = 72.06 g of H₂O.

Thus, the mass of water, H₂O produced from the reaction is 72.06 g

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Chocolate is a food product made from roasted and ground cacao pods, that is available as a liquid, solid or paste, on its own or as a flavouring agent in other foods. The seeds of the cacao tree have an intense bitter taste and must be fermented to develop the flavour.

Chocolates are solid at ambient (20–25 °C) and melt at oral temperature (37 °C) during consumption giving a smooth suspension of particulate darkens in cocoa butter and milk fat (Beckett, 1999 and Whitefield, 2005).

After fermentation, the beans are cleaned, sorted, graded and then roasted. The bean shells become brittle and the colour of the beans darken. The process converts the flavour precursors within the bean into compounds such as aldehydes, esters, lactones, and pyrazine, which give chocolate its aroma and flavour.

Answer:

pretty sure that's an old jolly rancher

Answer: true

Explanation:

The water molecule positioning has become farther apart, forming rings. Thus, B is  the correct option.

The molecules at the surface of water do not have water molecules above them to cling to, so they grow a stronger bond with the water molecules which are adjacent to them. Thus, the surface of the water develops a thin, flexible ‘skin’. Scientists call this surface tension.

Surface tension acts a bit like an elastic layer. Some insects can walk on water because their weight is little enough so it does not break through the surface tension. If we look carefully at the insect’s feet, we can see that the water looks as if it is stretched.

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The correct question is:

you decide to blow bubbles (soapy water) outside on a snowy day. which answer best explains what has happened to the molecule arrangement of the water?

A) The WATER molecule ARRANGEMENT has become CLOSER.

B) The WATER molecule ARRANGEMENT has become FARTHER APART, forming rings.

C) The WATER molecule ARRANGEMENT has become CLOSER, forming squares.

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Answer:

it blows up very lighty

Explanation: