Can you name some chemical elements you use or see on a regular basis?

The actual yield of the product obtained in the experiment must be divided by the theoretical yield of the product that could be achieved. The reaction's percent yield is 32% as a result.

The amount of product produced in a chemical reaction or manufacturing process is referred to as yield, and it is typically expressed in mass or volume. Theoretical yield, actual yield, and percent yield are a few of the several types of yield. Theoretical yield, under the assumption that the reaction continues to completion without any losses or side reactions, is the greatest quantity of product that can be produced from a specific amount of reactants. The amount of product that is actually produced during an experiment or production process is known as the "actual yield." The actual yield to theoretical yield ratio, stated as a percentage, is known as percent yield. The efficiency and profitability of a chemical reaction or manufacturing process are significantly influenced by yield.

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Answer: A. It indicates the direction in which the reaction occurs.

One example of an element that can react negatively with gold is fluorine (F).

Fluorine is a highly reactive nonmetal and the most electronegative element on the periodic table. It readily accepts electrons to achieve a stable electron configuration.

When fluorine reacts with gold, it can form a compound known as gold trifluoride (AuF3). Gold trifluoride is a yellow solid that is thermodynamically unstable and decomposes at room temperature.

The reactivity of fluorine towards gold is attributed to the large electronegativity difference between the two elements. Fluorine's strong electron affinity and high electronegativity allow it to oxidize gold by accepting electrons from the gold atoms. This results in the formation of AuF3.

It's important to note that the reactivity of gold with fluorine is relatively uncommon and occurs under specific conditions. Gold's unreactive nature is one of the reasons it is highly valued and widely used in jewelry, electronics, and various other applications.

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Explanation: The elements in the modern periodic table are arranged in order of their atomic numbers, which is the number of protons in the nuclei of the atoms of an element. Each element has a unique atomic number.

The boiling points of the compounds, ranked from lowest to highest, are CO2, LiF, and H2O.

A boiling point is a physical property that reflects the strength of intermolecular forces in a substance. It is influenced by factors such as molecular size, polarity, and the presence of hydrogen bonding. By analyzing the given compounds—CO2 (carbon dioxide), LiF (lithium fluoride), and H2O (water)—we can determine their relative boiling points.

CO2 is a nonpolar molecule composed of one carbon atom and two oxygen atoms. It exhibits London dispersion forces, which are weaker compared to other intermolecular forces. As a result, CO2 has the lowest boiling point among the three compounds.

LiF is an ionic compound consisting of lithium cations (Li+) and fluoride anions (F-). Ionic compounds have strong electrostatic attractions between ions, resulting in high boiling points. Therefore, LiF has a higher boiling point compared to CO2.

H2O is a polar molecule with two hydrogen atoms and one oxygen atom. It exhibits hydrogen bonding due to the presence of polar O-H bonds. Hydrogen bonding is a strong intermolecular force, leading to higher boiling points. Consequently, H2O has the highest boiling point among the three compounds.

In summary, the boiling points of the compounds, ranked from lowest to highest, are CO2, LiF, and H2O.

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Answer:

V = 0.0496 L

Explanation:

Given that,

The mass of a sample, m = 352.2 g

The density pf sample, d = 7.10 g/mL

We need to find the volume of the sample. We know that the density of an object is given by :

\(d=\dfrac{m}{V}\\\\V=\dfrac{m}{d}\\\\V=\dfrac{352.2}{7.1}\\\\V=49.6\ mL\)

or

V = 0.0496 L

So, the volume of the sample is 0.0496 L.

Answer:

[He] 2s2 2p3

[Ne] 3s² 3p⁵

[Ar] 4s¹

Answer: Sodium chloride

Lithium iodide

Explanation:ther just are

The relative abundance of the fourth isotope, given the abundance of the 1st, 2nd and 3rd isotopes is 0.28%

From the question given above, the following data were obtained:

The abundance of 4th isotope can be obtained as illustrated below:

Total abundance = Abundance of 1st + Abundance of 2nd + Abundance of 3rd + Abundance of 4th

100 = 5.90 + 91.72 + 2.10 + Abundance of 4th

100 = 99.72 + Abundance of 4th

Collect like terms

Abundance of 4th = 100 - 99.72

Abundance of 4th = 0.28%

Thus, the relative abundance of the 4th isotope is 0.28%

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The required mass of water vaporized is 15.5 grams, from a 250 gram sample of water at the boiling point had 35.0 kj

Given: Mass of water (m) = 250 gHeat added (q) = 35.0 kJHeat of vaporization (ΔHvap) = 40.6 kJ/mole

To find:Mass of water vaporized (x) Formula:q = ΔHvap × nx = (q / ΔHvap) × nMass = moles × molar mass

We know that molar mass of water (H2O) = 18 g/molMoles of water vaporized (n) = (35.0 kJ / 40.6 kJ/mol) = 0.861 mol

Therefore,Mass of water vaporized (x) = 0.861 mol × 18 g/mol= 15.5  

Detailed Solution: According to the given statement,250g of water was taken at its boiling point and 35.0 kJ of heat was added to it, we need to find how many grams of water were vaporized. To solve this question, first, we need to know the heat of vaporization for water, which is 40.6 kJ/mole. It means to vaporize 1 mole of water, 40.6 kJ of heat is required.

Mass of water (m) = 250 g Heat added (q) = 35.0 kJHeat of vaporization (ΔHvap) = 40.6 kJ/molen = q / ΔHvapn = (35.0 kJ / 40.6 kJ/mol) = 0.861 molMoles of water vaporized (n) = 0.861 mol

Therefore, Mass of water vaporized (x) = 0.861 mol × 18 g/mol= 15.5 g Hence, the required mass of water vaporized is 15.5 grams.

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Two responsible uses of machines are in Agriculture to improve efficiency, productivity, and profitability and in the medical field to diagnose and treat patients. Two irresponsible uses of machines are: Some produce a significant amount of pollution and harmful emissions, and machines are designed for warfare and destruction.

An MRI (Magnetic Resonance Imaging) machine is a medical diagnostic tool that uses a powerful magnetic field, radio waves, and a computer to produce detailed images of internal organs, tissues, and bones in the body. It is a non-invasive and painless procedure that can provide valuable information about various conditions and diseases.

Machines have made agriculture practices easier and more efficient for farmers by increasing productivity, precision, and quality while reducing labor costs and physical strain.

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The ways to identify the components necessary for a combustion reaction include:

This is referred to as burning and involves high-temperature exothermic redox chemical reaction.

This type of reaction involves the use of a gas such as oxygen which supports it and other flammable substances.

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Ariana is playing basketball with her friends. They are using an orange basketball. Because all visible light waves except orange are absorbed by the ball.

The correct answer is A.

The correct answer is A.

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Answer:

experiments

Explanation:

I am not sure but heres my take

Answer:

It was only after the invention of electron microscope that the idea developed

The density of the block of metal is 11.239 grams per cubic centimeter.

To determine the density of the block of metal in grams per cubic centimeter,
1 in^3 = 16.387 cm^3 (conversion factor)
13.0 in^3 x 16.387 cm^3/in^3 = 213.431 cm^3
So, the volume of the block of metal is 213.431 cm^3.
1 lb = 453.592 g (conversion factor)
5.28 lb x 453.592 g/lb = 2399.66 g

So, the weight of the block of metal is 2399.66 g.
Now we can calculate the density:
Density = mass/volume
Density = 2399.66 g / 213.431 cm^3
Density = 11.239 g/cm^3

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Answer:

las plantas

Explanation:

Las plantas son los seres vivos capaces de transformar energía luminosa utilizando agua y dióxido de carbono (CO₂) en energía química en forma de moléculas llamadas carbohidratos. El proceso a través del cual realizan esto se denomina fotosíntesis, y para ello requieren un pigmento de color verde denominado clorofila, el cual es necesario para captar la energía luminosa proveniente del Sol.

Answer:

The correct answer is C

Explanation:

light refracts whenever it travels at an angle into a substance with a different refractive index(optical density)

Answer:

This answer is 108g mass of aluminum is produced from 100g of aluminum oxide

An atom with 6 bonds without a lone pair of electrons gives an octahedral molecular shape using the VSEPR rules.

What is VSPER Theory?

Based on the number of valence shell electron bond pairs between the atoms in a molecule or ion, the valence shell electron pair repulsion (VSEPR) hypothesis is a model used to predict 3-D molecular shape. According to this hypothesis, electron pairs will position themselves to reduce the consequences of their mutual repulsion. The electron pairs are, in other words, as far apart as they can be.

For forecasting and visualising molecular structures, utilise the VSEPR model. Linear, trigonal planar, angled, tetrahedral, trigonal pyramidal, trigonal bipyramidal, disphenoidal (seesaw), t-shaped, octahedral, square pyramidal, square planar, and pentagonal bipyramidal are the different types of structures.

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There are 4.5 moles of NH3 needed to prepare 3 liters of 1.5 M NH3, you can use the formula for molarity:
Molarity (M) = moles of solute (n) / volume of solution (L)

In this case, you are given the molarity (1.5 M) and the volume of the solution (3 L), and you need to find the moles of NH3 (n).
Rearrange the formula to solve for n:
n = Molarity × Volume
Now, plug in the given values:
n = 1.5 M × 3 L
n = 4.5 moles

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The ionization constant of an acid is denoted by the symbol Kₐ. The smaller the value of Kₐ for an acid, the weaker will be the acid. Thus the correct option is D.

The acid dissociation constant denotes the measure of the extent to which an acid dissociates in the solution. The strength of an acid is represented by the value Kₐ. The less an acid dissociates, smaller will be the value of Kₐ, the stronger the acid, higher will be the value of Kₐ.

The dissociation of HNO₂ is given as:

HNO₂ (aq) ⇄ H⁺ (aq) + NO₂⁻ (aq)

The dissociation constant of HNO₂ is given as:

Kₐ = [H⁺][NO₂⁻] / HNO₂

The value of Kₐ is constant at a particular temperature. We can use this fact to find out the pH of a weak acid at a particular temperature.

Thus the correct option is D.

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Answer:

it is in solid state

Explanation:

at 100% heat

At regular intervals, check the stearic acid's temperature. Make a note of the findings and create a temperature vs time graph.

The physical concept of temperature indicates in numerical form how hot or cold something is. A thermometer is used to determine temperature. Thermometers are calibrated using a variety of temperature scales, which historically defined distinct reference points and thermometric substances.

For above given example, check the temperature of the stearic acid often and make a note of the results and plot the temperature against time.

Temperature is not the same as the energy of a thermodynamic system; for instance, an iceberg has a significantly larger total heat energy than a match, despite the fact that a match is burning at a much higher temperature.

Thus, at regular intervals, check the stearic acid's temperature. Make a note of the findings and create a temperature vs time graph.

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Answer:

4:D 5:D

Explanation:

The pressure of the gas after the explosives are detonated and the volume increases to 1.5 x 10^3 L is 23.03 atm.

To solve this problem, we can use the ideal gas law:

PV = nRT

where P is the pressure of the gas in atm, V is the volume of the gas in liters, n is the number of moles of gas, R is the ideal gas constant (0.08206 L·atm/(mol·K)), and T is the temperature of the gas in Kelvin.

First, we need to convert the initial volume of the gas from 0.065 L to 1.5 x 10^3 L, so we can find the final pressure:

V1 = 0.065 L

V2 = 1.5 x 10^3 L

We can use the combined gas law to find the initial pressure of the gas, assuming that the temperature remains constant:

(P1V1)/T = (P2V2)/T

Simplifying, we get:

P1 = (P2V2/V1) = (760 mmHg)(1.5 x 10^3 L/0.065 L) = 1.75 x 10^4 mmHg

To convert this pressure to atm, we need to divide by the conversion factor of 760 mmHg/atm:

P1 = (1.75 x 10^4 mmHg)/(760 mmHg/atm) = 23.03 atm

Therefore, the pressure of the gas after the explosives are detonated and the volume increases to 1.5 x 10^3 L is 23.03 atm using PV = nRT.

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Answer:

4202.1 K

Explanation:

From;

PV=nRT

P= pressure of the gas = 18.5 bar

V = volume of the gas = 115L

n= number of moles of the gas =  6.1 mole

T= temperature of the gas = ?

R = gas constant = 0.083 L⋅bar⋅K−1⋅mol−1

T = PV/nR

T = 18.5 * 115/6.1 * 0.083

T = 2127.5/0.5063

T= 4202.1 K

The pH active salt hydrolysis reaction for NH4NO3 is 2NH4NO3 + 2H2O → 2NH3 + 2HNO3 + H2OIt's a hydrolysis reaction of NH4NO3.

When NH4NO3 is mixed with water, it hydrolyzes to NH3 and HNO3. It can also be described as the reaction of the ammonium ion (NH4+) and the nitrate ion (NO3-) with water (H2O). NH4NO3 is a salt with acidic and basic properties, which means it can undergo a pH active salt hydrolysis reaction. This reaction alters the pH of the aqueous solution to which it is added.

When NH4NO3 dissolves in water, it splits into NH4+ and NO3- ions, both of which are hydronium ion scavengers. As a result, when NH4NO3 is added to water, it decreases the pH of the solution. The hydrogen ions that are generated by the ammonium ion's hydrolysis and nitrate ion's hydrolysis are the reason for this. The pH active salt hydrolysis reaction for NH4NO3 is 2NH4NO3 + 2H2O → 2NH3 + 2HNO3 + H2O.

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Answer: Silicon tetrahydride (silane) is a covalent compound where a central silicon (Si) atom is covalently bonded to 4 terminal hydrogen (H) atoms.

Explanation:

1) Assuming that only single bonds are formed by group 4A(14) elements, the shape of a central atom of group 14 is tetrahedral.

The general electronic configuration of group 14 elements is ns²np² and it is shown in box diagram in the attached image. When one electron is excited, it goes in vacant p-orbital and the p and s-orbital is half filled. It is shown in attached image.

When the another atoms are filled in the half-fiiled orbital, it forms sp³ hybridisation and its shape is tetrahedral.

Therefore, the shape of central atom of group 14 is tetrahedral.

2) Assuming that only single bonds are formed by group 4A(14) elements, the shape of a central atom of group 15 is pyramidal.

The general electronic configuration of group 15 element is  ns²np³ and its box diagram is already shown in the image. When atoms are filled, it goes in p-orbital and pair of electron acts as a lone pair. Due to this lone pair, lone pair-bond pair repulsion is occurred and the geometry of the central atom is pyramidal.

Therefore, the shape of central atom of group 15 is pyramidal.

3) Assuming that only single bonds are formed by group 4A(14) elements, the shape of a central atom of group 16 is bent.

The general electronic configuration of group 16 is ns²np⁴ and its box diagram is shown in the attached image. There are two electron pairs which acts as a lone pair and another two orbitals are filled by another atom. When they are filled, it shows lone pair-lone pair, lone pair-bond pair and bond pair-bond pair repulsion. Therefore, they are come closer to each other and forms bent shape.

Therefore, the shape of the central atom of group 16 is bent shape.

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Answer:

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