what is the electron pair geometry for an ammonia molecule, nh3? question 7 options: a) linear b) bent c) trigonal pyramidal d) tetrahedral e) none of the above

Sodium hydroxide and hydrogen gas are products.

2Li (s) + 2 H2O (l) → 2 LiOH (aq) + H2 (g)

What is Chemical Reaction?

In a chemical reaction, bonds between molecules of the reactant are broken and new bonds between molecules of the product are established to create a new substance.

Chemical reactions occur all around us, including in our body's digestion of food and the creation of the sunlight's light. Understanding physical and chemical changes is crucial before starting any chemical processes.

The following balanced chemical equation depicts how lithium metal reacts with water to produce lithium hydroxide and hydrogen gas

LiOH (aq) + H2 = 2Li (s) + 2H2O (l)

0.30 mol of H2 gas is separated in the lab when Li is combined with extra water.

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Answer:

yes

Explanation:

The two type of health effects of chemical exposure are difficulty in breathing and burning of skin.

While working in a chemical laboratory, there are certain ways in which a person can be exposed to a harmful chemical.

If the chemical is present in the form of gas then it is very much possible that the person can inhale the chemical.

This might create a difficulty in breathing.

During chemical experiments, it is very certain that sometimes we require concentrated acid and base.

Both acid and base are very harmful for human skin. So, if the acid or base makes a direct contact with the skin it can cause a burn.

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The  rate of decay of a long half-life material is less than the rate of decay of a short half-life material.

Definition of Half-life

The half-life of a radioactive isotope is the total amount of time taken for one-half of the radioactive isotope to decay. Half-life of a material (symbol t½) is the time required for a quantity of material to reduce to half of its initial value.

The longer half life of the material is more stable than the short half life of that material.

Hence, the  rate of decay of a long half-life material is comparatively less to the rate of decay of a short half-life material.

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Fatty acid is a crucial part of lipids, which are the parts of living things including plants, animals, and microbes that may be dissolved in fat. Therefore, fatty acid synthesis involves that are discussed below.

A fatty acid is made up of a linear chain with an even amount of carbon atoms, hydrogen atoms all along the of the chain, a carboxyl group (COOH) at one end, and hydrogen atoms running the other end of the chain.

Fatty acid synthesis involves following steps

begins with  carboxylation of acetyl-CoA  

takes place in the cytoplasm

intermediates are linked to acyl carrier protein

use of NADPH

have a series of condensation

reduction and dehydration reactions.

Therefore, fatty acid synthesis involves that are discussed above.

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The mass of the iodine that can be obtained from the reaction is 79.5 Kg.

We know that we have to look at the stoichiometry of the reaction so as to be able to solve the question well. We know that to look at the stoichiometry, it is important that we should able to consider the mass - mass relationship between the compounds.

We have the reaction equation written out in the form; [tex]2KI --- > 2K + I_{2}[/tex]. We have been told in the question as we can see above that a sample of potassium iodide are decomposed into the constituent elements. and the sample produced 24.4 kg of potassium.

Number of moles of the potassium produced = the sample produced 24.4 * 10^3 g/39 g/mol

= 625.6 moles

If the reaction produces 2 moles of potassium and 1 mole of iodine then the number of moles of iodine produced = 625.6 moles/2

= 312.8 moles

Mass of the iodine produced = 312.8 moles * 254 g/mol

= 79.5 Kg

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9.30 mol of iron (II) nitrate will contain a total of 27.9 mol ions.

Iron (II) nitrate is made of two ions:

The compound ionizes according to the following equation:

[tex]Fe(NO_3)_2 --- > Fe^{2+} + 2NO_3^-[/tex]

In other words, 1 mole of iron (II) nitrate produces 1 iron ion and 2 nitrate ions.

Now, there are 9.3 moles of iron (II) nitrate. If 1 mole gives 1-mol 27.9 mol and 2-mol nitrate ions, then 9.3 moles will give:

9.3 mol iron ions

9.3 x 2 = 18.6 mol nitrate ions

Total number of ions = 9.3 + 18.6

                                   = 27.9 mols

In other words, the total number of ions in 9.30 mol of iron (II) nitrate would be 27.9 mol.

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chemical bonding allows each atom involved in the bond to fill its outer shell.

Chemical Bonds

Atomic or elemental bonds depend on the energy level in which the outermost electron e- or e- resides.

The first shell, the innermost level, can hold up to two electrons.

The second can hold up to 8 electrons.

The third can hold up to 8 electrons.

An atom

is stable or non-reactive if the outermost energy level (shell) holds the maximum number of electrons. It does not bond with other atoms. Does not form chemical bonds,

or compounds.

To become stable, atoms gain, lose, or share electrons to complete their outermost energy levels (electron shells).

octet rule because levels 2 and 3 need 8 electrons to be stable.

Look at the outermost electron shells (energy levels).

VALENCE

The number of electrons in the outer energy plane (shell) determines (tells) the valence of the atom.

Having 8 electrons in the outermost shell (the octet rule) determines the valence of the atom (it's a number).

Note: The "group number" in the periodic table indicates the number of electrons in the outermost shell. From this we can read how many electrons the atom must lose or gain to reach 8.

The valence is the number of electrons an atom loses or gains in order to have a perfect outer shell (it is always the minimum number).

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A chemical bond can be formed by exchange of electrons, sharing of electrons.

There are majorly three types of chemical bonds.

These are:

Ionic Bond,

Covalent Bond,

and Metallic Bonds.

Ionic Bond: When an atom lose or gain the electron to attain the stability it forms ions and the attractive forces between two oppositely charged ions is known as ionic attractions or electrostatic attractive forces.

and such formed bonds are known as ionic bonds.

An ionic bond is formed when the difference between the electronegativities of two atoms is high as an electron transfer to occur to form the ions.

Covalent Bond: A covalent bond consists of the mutual sharing of one or more pairs of electrons between two atoms.

A covalent bond is formed when the electronegativity difference of two atoms is too small for an electron transfer to occur to form ions.

Metallic Bonds: Metallic bonds are made up of electrostatic attraction between metal cations and the delocalized electrons. Metallic bond is  collective sharing of valence electrons between several positively charged metal ions.

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After 24 hours, only 1/8 (or 12.5%) of the original sample of technetium-99m remains.

What is half life?

Half-life is the amount of time required for a substance, such as a drug or radioactive material, to reduce to half its initial amount. The term is commonly used in the fields of nuclear physics and radiochemistry, where it describes the time required for a nucleus to reach half its original activity. In pharmacology, it is the time it takes for a drug to reduce its dose by half in the bloodstream. In general, the half-life of a substance is the amount of time it takes for the amount of the substance to decrease by half.

This is because the half-life of technetium-99m is 6 hours. This means that after 6 hours, half of the original sample has decayed, leaving only half of the original sample. Then after another 6 hours, half of that remaining sample decays, leaving 1/4 of the original sample. After another 6 hours, half of the remaining sample decays, leaving 1/8 of the original sample. Thus, after 24 hours, only 1/8 of the original sample of technetium-99m remains.

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In addition to other natural and human-made processes, the burning of organic materials is the main source of formaldehyde formation.

The simplest of the aldehydes, formaldehyde (HCHO), commonly known as methanal, is an organic molecule utilized in huge quantities during numerous chemical industrial processes. It is often supplied as formalin, an aqueous solution with a 37 percent concentration, and is primarily manufactured via the vapor-phase oxidation of methanol.

Industrial production of formaldehyde involves the catalytic oxidation of methanol. The most often used catalysts are iron(III) oxide, iron molybdenum oxides, and silver metal [e.g. Vanadium oxides or iron(III) molybdate with a molybdenum-enriched surface. Methanol and oxygen react at around in the commonly used formox process.

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Hydrogen, when combined with oxygen in a chemical reaction, forms water. This is an example of Combination reaction.

Chemical reaction-In a chemical reaction, one or more substances—also known as reactants—are changed into one or more additional substances—also known as products. Chemical elements or chemical compounds make up substances., Different types of reactions are Combustion reaction, Decomposition reaction, Neutralization reaction, Redox Reaction, Precipitation or Double-Displacement Reaction, Synthesis reaction.

Combination reactions is processes in which two or more substances or components come together to generate a single substance. Equations of the form X + Y XY serve as a representation for such reactions. A combination reaction is the joining of two or more components to create a compound.

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Answer:

D.The increases in CO2 is caused by burning of fossil fuels

Explanation:

CO2 increases happens because the coal or oil burning process combines carbon with oxygen in the air to make CO2.

so the answer is D. The increase in CO2 is caused by burning of fossil fuels

The empirical formula of the compound is CH₂O and when the molecular weight of this compound is 180 g, its molecular formula is C₆H₁₂O₆.

The molecular weight of the compound according to its empirical formula is given as,

12 + 2 + 16 = 30 g

It is given that molecular weight of the compound is 180 g, so the ratio is,

180/30 = 6

Therefore, we can obtain the molecular formula by multiplying to each element in the empirical formula.

C₆H₁₂O₆.

Hence, the empirical formula of the compound is CH₂O and when the molecular weight of this compound is 180 g, its molecular formula is C₆H₁₂O₆.

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A mixture of an aqueous solution containing 15.0 g of NaOH and 15.0 g of h2so4 is performed. The limiting reactant is sulfuric acid.

Na2SO4(aq) + 2H2O = H2SO4(aq) + 2NaOH(aq) (l)

sodium hydroxide molecular weight is 40 g.

sulfuric acid's molar mass is 98 g per mole.

Calculate the number of moles necessary to equal the given molar mass.

15g/40 = 0.375 moles of sodium hydroxide make up the whole amount.

Sulfuric acid has a molecular weight of 15/98, or 0.153 moles.

We can say that sulfuric acid is the limiting reactant because its moles are low.

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If the conventional hydrogen electrode is connected to the zinc half-cell, the zinc will be substantially more negative because the released electrons when zinc is oxidized will concentrate on the metal.

Zinc has a stronger tendency than hydrogen to generate ions (to be oxidized). The elements in the electrochemical series are grouped in accordance with their reduction potential. Zinc has a reduction potential of 0.76 volts, while iron has a reduction potential of 0.44 volts. As a result, zinc has a large negative reduction potential while iron has a low one. The electrode has a higher propensity to experience oxidation when the standard reduction potential is negative because it will rapidly lose electrons. As a result, it acts as a more powerful reducer than a hydrogen electrode.

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A phase transition means change of one phase of matter into another.

Solid, liquid and gas are the three states of matter. Matter is interconvertible in nature.

The three phases of transition of matter are: melting, freezing and evaporation. These transition processes take place due to absorption and release of energy.

In the melting process, solid ice melts into liquid water due to absorption of energy.

In the freezing process, energy is released by liquid water which gives rise to the formation of solid ice.

In the process of evaporation, energy is released by liquid water , which results in the formation of water vapour.

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Answer:

yes

Explanation:

1. If the density of your unknown liquid is 0.65 g/mL, calculate the volume in liters that 3 mL of your unknown liquid would occupy when vaporized at the barometric pressure and temperature of your boiling water bath in Run 1. Use the accepted molar mass of your suspected unknown: (0/1pts) Volume occupied when vaporized (L_ 3x0.65 (-1.0 pts) Incorrect. Convert from volume of liquid to moles of unknown using the density; 0.65 g.mL, and accepted molar mass for the suspected unknown: Do not use your experimentally determined molar mass. Once you have determined the moles of unknown; use the ideal gas law to determine the volume in liters that the gas will occupy once vaporized. Make sure to use the temperature of the water bath from Run 1 in Kelvin and the barometric pressure you recorded, in atm: (1/1pts) Based on the volume of the flask (L) from run 1, was 3 mL sufficient liquid to use in your experiment? yes

This question is incomplete

In order to calculate the number of moles of CuSO4 in the impure solution, we need to have the mass of copper sulphate in that impure solution. Only then, we can divide the mass of copper sulphate with its molar mass to get the number of moles of CuSO4 in the solution.

Therefore, the formula to calculate the number of moles of CuSO4 in the solution is

Number of moles = Mass of copper sulphate/ molar mass of copper sulphate

If you are given the molarity of a particular volume of the solution. You can apply following formula

Molarity = moles / volume of solution

Or

Moles = molarity x volume of solution

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Systematic error, random error, and human error are the three main types of mistake in physical and chemical laboratory research. Prior to taking any further action, these lab error sources should be thoroughly investigated.

Assuming you are using a stopwatch to determine the amount of time required for 10 pendulum oscillations, an example of how to tell systemic from random errors is to assume that you are. Your response time can be a factor when starting and stopping the watch. During one measurement, you might begin early and end late; on the following one, those inaccuracies can be corrected. Since all situations have an equal likelihood, these mistakes are unintentional. Repeated tests result in a series of slightly varying times. They fluctuate randomly around an average value.

If there is a systemic error, for instance, your stop watch won't start at zero, then the calculations will be different regarding the displaced value rather than the average value.

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Base solution of the concentration used in this laboratory 0.182

Moles = given mass/molar mass

Molarity equation, M1 V1 = M2 V2

a) Assuming base solution concentration used in lab = 1M

Volume of NaOH needed= V1 = (M2 × V2)/M1 = (1L×1M)/5.5M = 0.182

b) Moles NaOH = 0.025 L × 0.18 M = 0.0045 mol

Molar mass KHP = 204.22 g/mol

Mass KHP = 0.0045 mol × 204.22 g/mol = 0.91899 g

c) given the uncertainty in mass of ±0.1g,

we can predict the range of mass = 0.8—1.0 g

The ability to suppose cautiously about some thing you are doing and nothing else. The noise outdoor made concentration difficult. there has been a glance of severe attention on her face.

An area ready for experimental take a look at in a science or for testing and evaluation a research laboratory widely a place imparting possibility for experimentation, observation, or exercise in a discipline of take a look at an area like a laboratory for trying out, experimentation, or exercise.

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The equilibrium constant of a reaction determined by "The molarity of products is divided by the molarity of reactants".

What is molarity ?

A chemical entity's concentration in some kind of a solution, specifically the quantity of a solute per unit volume of solution, has been measured by its molar concentration.

Moles = given mass/molar mass

Molarity equation, M1 V1 = M2 V2

Solution concentration = 1M

Moles NaOH = 0.025 L × 0.18 M = 0.0045 mol

Molar mass KHP = 204.22 g/mol

Mass KHP = 0.0045 mol × 204.22 g/mol = 0.91899 g

Volume of NaOH needed= V1 = (M2 × V2)/M1 = (1L×1M)/5.5M = 0.182

Therefore, the volume of the molarity used is 0.182

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The lewis electron-dot diagram which represents the bonding in potassium iodide, KI is give in image attached.

The correct answer choice is option 1.

The lewis structure can simply be defined as those diagrammatic chemical representations which describes the bonding between atoms in a particular molecular structure of a chemical substance. From the context of the above given task, the structure is bonded by eight different electrons.

The importance of lewis electron-dot structures cannot be overemphasized. Some of its significances are as follows:

In conclusion, we can now confirm from the explanation given above that potassium iodide is solid chemical compound.

The complete image of the options of the question is also attached.

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moles of carbon monoxide is 0.277 moles.

If a container of of 14.0l Hold 0.6725mol.

[tex]n_{1\\}[/tex] = 0.625i

[tex]v_{1}[/tex] = 14.0l

container 2; [tex]v_{2}[/tex] = 8.01l;

let [tex]n_{2}[/tex] be find moles at constant pressure and temperature by Ideal gas equation,

[tex]\frac{v_{1} }{n_{1} }[/tex] = [tex]\frac{v_{2} }{n_{2} }[/tex]

[tex]\frac{14}{0.625}[/tex] = [tex]\frac{8.01}{n_{2} }[/tex]

[tex]n_{2}[/tex] = 0.358 moles

hence, moles of carbon monoxide escaped

=0.625-0.358

=0.277moles

mole, also spelled mol, in chemistry a standard scientific unit for measuring large quantities of very small entities such as atoms, molecules or other specified particles. The mol designates an extremely large number of units, [tex]6.02214076*10^{23}[/tex].

Carbon monoxide (chemical formula CO) is a colorless, non-toxic, odorless, tasteless, combustible gas that is slightly less dense than air. Carbon monoxide is a triple bond between a carbon atom and an oxygen atom.

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To determine volume, we must work with density. But firstly we have to know the mass.

Density = mass/volume

Ratio is 2:1

CO density = CO mass / CO volume

1.18×10⁻³g/mL = CO mass / 0.626 L

First we must convert 0.626L to mL, because the units of density

0.626L = 626 mL

1.18×10⁻³g/mL = CO mass / 626 mL

CO masa = 1.18×10⁻³g/mL . 626 mL → 0.741 g

Let's convert to moles, the mass of CO ( mass . molar mass)

0.741 g / 28 g/mol = 0.0264 moles

As ratio is 2:1, we would need the half of moles, so (0.0264 / 2) = 0.0132 moles are required for the reaction.

Let's convert the moles to mass (molar mass  . moles)

32 g/mol . 0.0132 mol = 0.423 g

Now, we can work with oxygen density

O₂ density = O₂ mass / O₂ volume

1.43×10⁻³g/mL = 0.423g / O₂ volume

O₂ volume =  0.423g / 1.43×10⁻³g/mL → 296 mL

0.358 moles

hence, moles of carbon monoxide escaped will be

0.625 - 0.358 = 0.277moles

Therefore, the moles will be 0.277 moles.

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The conversion of volume to moles at STP is 1 mole.

The ideal gas equation is given as :

P V = n R T

where,

P = pressure of the gas

V = volume of the gas

n = ?

R = constant = 0.823 atm L / mol K

T = temperature

At STP , the pressure is 1 atm and the temperature is 273.15 K, the volume At STP is 22.4 L.

moles , n = P V / R T

n = ( 1 × 22.4 ) / (0.0823 × 273.15)

n = 1 mole

Thus, at STP , the number of moles is 1 mol.

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The given statement is True.

A calorimeter is a tool used in the calorimetry process. Calorimetry is a method for measuring a physical or chemical reaction's heat capacity as well as its heat changes. Therefore, the measurement of heat gained or lost by a system and its surroundings uses a calorimeter

Where is calorimetry employed?

Calorimetry is a popular tool for measuring chemical reactions and biological ones. The primary benefit of calorimetry is that it does not require expensive equipment and can monitor minute changes in energy.

What is a practical illustration of calorimetry?

Calorimeters are useful in a variety of fields, including academia. An industrial pilot plant can use a DSC to assess the impact of a change to a product's formula. In food testing labs, oxygen bomb calorimeters are useful for calculating the quantity of heat (calories) in food.

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The option (b) is correct - 3.11 g.

What is concentration?

(KON-sen-TRAY-shun) The quantity of a substance, like salt, that is present in a specific volume of tissue or liquid, like blood, according to scientific definition.

What is mass?

Although grams can be used to measure lower quantities instead of kilograms, which is the standard SI unit for mass (g). Using a balance would be necessary to determine mass.

Gives that

volume of solution = 350 ml

350/1000 l = 0.350l

concentration of na+ ions = 0.125m

concentration of mg2so4 = concentration of na/2

concentration of na2so4= 0.125/2m= molarity

moles of na2so4= m*v

o.125/2*0.350

0.021875 moles

molar mass of g na2so4= 142.04g/mol

mass g m na2so4 = molar mass * mole

142. 04* 0.021875

=3.11g

Therefore, option (b) is correct - 3.11 g.

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Holding a toast  will not help in preventing Johny from dying of hypothermia as the thermal energy produced by holding a hot toast is not sufficient to maintain the thermal energy of the body.

Thermal energy is defined as a type of energy which is contained within a system which is responsible for temperature rise.Heat is a type of thermal energy.It is concerned with the first law of thermodynamics.

Thermal energy arises from friction and drag.It includes the internal energy or enthalpy of a body of matter and radiation.It is related to internal energy and heat .It arises when a substance whose molecules or atoms are vibrating faster.

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When solid magnesium sulfate MgSO₄ is poured into water, then the dissolution of MgSO₄ occurs. MgSO₄ is a strong electrolyte. Hence, the reaction is MgSO₄ + H₂O ⇒ Mg²⁺ + SO₄²⁻ + H⁺ + OH⁻.

Magnesium sulfate, also known as magnesium sulphate, is a salt with the chemical formula MgSO4 that is made up of the cations magnesium and sulfate. It is a crystalline white substance that dissolves in water but not ethanol.

Epsom salt can be dissolved in water to create hard water. Hard water is the outcome of the separation of magnesium ions (Mg2+) and sulfate ions (SO4-2) during the dissolution of Epsom salt (magnesium sulfate).

Thus, When solid magnesium sulfate MgSO₄ is poured into water, then the dissolution of MgSO₄ occurs.

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The statement that is correct is if a molecule contains polar bonds, then it will be a polar molecule. a molecule with a single polar bond will be polar overall.

Bond among or extra atoms is polar if the atoms have notably exceptional electronegativities (>0.4). Polar bonds do now no longer percentage electrons equally, that means the bad rate from the electrons isn't always calmly dispensed withinside the molecule.

This reasons a dipole moment.Polar MoleculesIn a molecule having a polar bond, the centre of the bad rate can be on one side. Whereas the centre of superb rate can be at the exceptional side. The whole molecule can be a polar molecule.

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