alance the equations: H2 +Cl2 → HCI
KNO3 → KNO2 + 02
Li + O2 → Lizo
Fe + O2 → Fe2O3
Fe2O3 + CO → Fe + CO2

When potassium chloride (KCl) is dissolved in water, the temperature decreases because the energy required to separate the potassium (K) and chloride (Cl-) ions and the energy required to separate the water molecules is greater than the energy produced by the attractions between the K and Cl- ions.

When KCl dissolves in water, the K and Cl- ions are surrounded by water molecules. The process of dissolving involves breaking the ionic bonds between the K and Cl- ions and the formation of new ion-dipole interactions between the ions and water molecules. To separate the K and Cl- ions, energy must be supplied to overcome the attractive forces between them. Additionally, to separate the water molecules, energy is required to disrupt the intermolecular hydrogen bonding between the water molecules. The energy produced by the attractions between the K and Cl- ions is not sufficient to compensate for the energy required to break these bonds. As a result, energy is absorbed from the surroundings, which leads to a decrease in temperature. The endothermic process of dissolving KCl in water, which requires more energy input than energy released, causes the temperature of the solution to decrease.

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Answer:

Element 38: Strontium

Explanation:

Answer:

autotrofas estrictas son aquellas bacterias incapaces de crecer usando materia orgánica como fuente de carbono. Mixotrofas son aquellas bacterias con metabolismo energético litotrofo (obtienen energía de compuestos inorgánicos), pero requieren sustancias orgánicas como nutrientes para su metabolismo biosintético.

The mass of the gold block is 11,464.2 grams (or approximately 11.5 kg).

If we are given a block of gold with dimensions 27 cm (length), 11 cm (width), and 2.0 cm (thickness), we can calculate the volume and mass of the gold block.

The volume (V) of the gold block can be calculated using the formula:

V = length x width x thickness

Given values:

Length = 27 cm

Width = 11 cm

Thickness = 2.0 cm

Substituting the values into the formula:

V = 27 cm x 11 cm x 2.0 cm

V = 594 cm³

The volume of the gold block is 594 cm³.

To calculate the mass of the gold block, we need to know the density of gold. The density of gold is approximately 19.3 g/cm³.

The mass (m) of the gold block can be calculated using the formula:

m = density x volume

Given:

Density of gold = 19.3 g/cm³

Volume of the gold block = 594 cm³

Substituting the values into the formula:

m = 19.3 g/cm³ x 594 cm³

m = 11,464.2 g

The mass of the gold block is 11,464.2 grams (or approximately 11.5 kg).

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A quantum dot is a tiny particle of matter that is only a few nanometers in diameter, roughly the size of a virus. A crystal is a periodic array of atoms, which means the atoms are organized into a repeating pattern. The edge length of a cubic crystal refers to the distance between opposite faces of the cube. Thus, if a quantum dot is shaped like a cube, the cubic crystal would contain a certain number of atoms.

What is an atom? An atom is the smallest unit of an element that retains its chemical properties. An atom is composed of a nucleus, which contains positively charged protons and uncharged neutrons, and negatively charged electrons that move around the nucleus. The quantum dot is made up of an array of atoms. Since a cube has six faces, the total number of atoms in a cubic crystal can be found using the formula given below:natoms = N x N x Nwhere N is the number of atoms per edge. Here, the edge length is given as 3.00 nm. Let's convert this to meters:3.00 nm = 3.00 x 10⁻⁹ m. Thus, the number of atoms per edge is given by:N = (length of edge) / (atomic diameter)The atomic diameter is approximately 0.1 nm.N = (3.00 x 10⁻⁹ m) / (0.1 x 10⁻⁹ m)N = 30 atoms/edgeTherefore, the total number of atoms in the cubic crystal is:natoms = N³ = (30)³ = 27,000 atoms. Hence, there are 27,000 atoms in a cubic crystal with an edge length of 3.00 nm.

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Answer:

218.98 grams

Explanation:

Given that,

No. of moles, n = 2.3

The molar mass of magnesium chloride is 95.211 g/mol.

We need to find the mass of 2.3 moles of magnesium chloride.

We know that,

No. of moles = given mass/molar mass

Let m be the given mass. So,

\(m=n\times M\\\\=2.3\times 95.211 \\\\=218.98\ g\)

So, the required mass is equal to 218.98 grams.

Answer:

No, i will not use a water pipe consisting of the two metals

Explanation:

Looking at the reduction potential of the both metals, it is clear that an electrochemical cell is set up with iron as the anode and copper as the cathode.

This will make the iron to quickly corrode and eventually destroy the water pipe. It is better to have a set up in which another metal that is higher than iron in the electrochemical series is combined with it.

Answer:

CO2 AND H2O are the products of the following reaction

Answer:

A. The total mass of materials present after a chemical reaction is the same as the total mass present before the reaction.

Explanation:

Law of conservation states that whatever mass you start with you will end with, mass cannot be gained or lost

The standard enthalpy of reaction for a system in which increasing the temperature by 15 K reduces the equilibrium constant by half, relative to its value at 310 K is -0.956 kJ/mol.

Given: ΔT = 15 K and ∆K/K = 1/2

Temperature is directly proportional to equilibrium constant K,

So, ∆T/T = ∆K/K

This can be written as ∆K/K = ΔH°/R × (1/T2 − 1/T1)

On solving this equation, we getΔH° = −2.303 × R × ΔK/K × T2T2 = 310 + 15 = 325 K∆K/K = 1/2∆H° = −2.303 × 8.314 J mol−1 K−1 × 1/2 × 325 K∆H° = −955.7 J mol−1= −0.956 kJ/mol

Therefore, the standard enthalpy of reaction for a system in which increasing the temperature by 15 K reduces the equilibrium constant by half, relative to its value at 310 K is -0.956 kJ/mol.

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The following describes a panel of tests for carbon dioxide, potassium, chloride, and sodium is an electrolyte panel.

The description that best fits a panel of tests for carbon dioxide, potassium, chloride, and sodium is an electrolyte panel or an electrolyte blood test.

An electrolyte panel is a group of blood tests that measure the levels of various electrolytes in the body, including carbon dioxide (CO₂), potassium (K⁺), chloride (Cl⁻), and sodium (Na⁺). These electrolytes play crucial roles in maintaining the body's fluid balance, acid-base balance, and nerve and muscle function.

During an electrolyte panel, a blood sample is collected, and the levels of these electrolytes are measured. The results provide valuable information about the body's electrolyte balance and can help diagnose and monitor conditions such as dehydration, kidney disorders, electrolyte imbalances, and certain metabolic disorders.

In addition to carbon dioxide, potassium, chloride, and sodium, an electrolyte panel may also include tests for other electrolytes such as calcium, magnesium, and phosphate, depending on the specific needs of the patient and the healthcare provider's assessment.

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Answer:

I guess second option i.e. More potential employment opportunities and revenue because collecting recyclable material needs manpower to collect them, and secondary employment in transport i.e. to collect all the material at one place we need transport and so on!

Answer:

d

Explanation:

Answer:

Answer is D.

in the cracks and pores beneath Earth's surface

Explanation:

hope this helps!

Answer:

The waves are behaving this way due to the simultaneous water drops landing in the water.

Explanation:

because ima smart baddie (≧▽≦)

The structure from which the product was obtained has been shown in the image attached to this answer.

We need to refresh our mind about the oxidation of the alcohols. When we alcohol, the compound that we would obtain, we depend on the kind of alcohol that is oxidized as we can see. When we oxidize a primary alcohol, we would obtain a carboxylic acid which can be further oxidized to give an alkanone.

When we oxidize a secondary alcohol, we would now obtain a ketone. We have to look at the structure of the product that we have and this would then give us an idea of the kind of the compound that may have been oxidized so that we can be able to get the compound as it has been shown.

Since the product of the oxidation is an alkanoic acid, we can be able to see that the compound that it was obtained from is a primary alcohol

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Answer:

See explanation below

Explanation:

In this case, you just need to apply the following expression:

Pc = Patm + h + d1/d2

Where:

Pc: Pressure of container

Patm: Atmospherical pressure

h: height of the arm of manometer

d1: density of gas

d2: density of mercury

You are not providing the density of the gas which is filled the container, so, let's assume we are filling this with hexane (d = 0.65 g/mL)

We have all in mm Hg so we just need to apply the above expression:

Pc = 757.1 + 203.3 * (0.65/13.546)

Pc = 757.1 + 9.7553

Pc = 766.8553 mmHg

Answer:

10.81

Explanation:

you can see the answer at the pic

Molarity= No of moles of solute * 1000 / vol solution in ml

No of moles= Given mass / Molar mass

Given Mass of solute (H2O2)= 10g

Molar mass of H2O2=34gmol^-1

No of moles= 10/34= 0.294 moles

Volume of solution=50ml

Molarity =   0.294*1000 / 50

Molarity = 5.8M

Answer:

Ionic bond is the intermediate in strength.

Explanation:

Ionic bond is weaker than covalent bond and stronger than hydrogen bond in strength because in ionic bond, the atoms attract each other due to opposite in charge. Ionic bond is a type of bond in which one atom losses electron completely and become cation (positive charge) while the other atom receive the electron and become anion (negative charge). so they attract each other due to opposite charges.

The given statement, "the pentose phosphate pathway can be characterized as an anabolic pathway" is true.

The pentose phosphate pathway, also known as the phosphogluconate pathway or hexose monophosphate shunt, is an important metabolic pathway that functions alongside glycolysis, the citric acid cycle, and oxidative phosphorylation, among others, to produce energy in the form of ATP or NADPH for a variety of cellular processes.

The pentose phosphate pathway plays an essential role in anabolic reactions, including DNA and RNA synthesis, as well as the synthesis of NADPH, an essential cofactor for biosynthesis reactions. In addition, the pathway is crucial for antioxidant protection, as it helps to prevent oxidative stress by producing NADPH, which is used to regenerate glutathione, a potent antioxidant.

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The melting of solid wax to form liquid wax and the evaporation of liquid wax to form wax vapor are physical changes. The burning of the wax vapor is a chemical change.

Answer:

The stable ion the sulfur would form is the sulfide ion,

Explanation:

When any atom accept electrons it converts into negative ion/an anion. So it will change into Z 3− after gaining 3 electrons.

Sulfur is an elemental atom that has an atomic number of 16 and an atomic mass of 32.065 amu. If the sulfur atom gains three protons then potassium will be formed.

A proton has been a sub-atomic particle that has been known to carry a positive charge and are tend to remain inside the nucleus with the neutrons bonded together by the nuclear force.

The proton of the atom is the characteristic property of the element in the periodic table. They are the sole sub-atomic particle that gives the atomic number of the elemental atom.

The sulfur atom has the atomic number 16 which means it has 16 protons, so if three protons are added to it then the number f protons become 19 which is an atomic number of the potassium (K) element.

Therefore, a potassium element is formed.

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Answer:

iron, it is more dense than aluminum

Explanation:

Answer:

Aluminium

Explanation:

The temperature change obtained by Al is accurate

From the question, we were told that the thermometer is faulty, given a reading that is 2.0 °C too high.

Al obtained a temperature change of 11.4 °C.

This value (11.4 °C.) is consider accurate because twhen we subtract 2 from both the initial and final temperature, the change in temperature obtained will still be the same. This is illustrated below:

ΔT = T₂ - T₁

ΔT = 54.7 - 43.3

ΔT = 11.4°C

Thus, we can see that the result obtained is still 11.4°C. Therefore, the temperature change obtained by Al is accurate

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The percent by mass of acetic acid in the vinegar is 2.33%.

Below are the steps to solve the given problem using the data table given below:

Step 1: Calculate the mass of the vinegar. Given,Mass of flask and vinegar solution- 25.17gMass of flask- 15.12gMass of vinegar solution = Mass of flask and vinegar solution - Mass of flask= 25.17 g - 15.12 g= 10.05 g

Step 2: Calculate the moles of NaOH used in the titration.Molarity of NaOH solution is 0.1 M.Moles of NaOH = Molarity × Volume of NaOH usedMoles of NaOH = 0.1 M × 39.00 mL (since the initial volume of NaOH is 0.00 mL)Moles of NaOH = 0.0039 moles

Step 3: Determine the moles of acetic acid used in the reaction.The balanced chemical equation for the reaction between NaOH and acetic acid (the main component of vinegar) is given below:CH3COOH + NaOH → CH3COONa + H2OMoles of NaOH = Moles of CH3COOH (since they react in a 1:1 ratio)Moles of CH3COOH = 0.0039 moles

Step 4: Calculate the mass of acetic acid used in the reaction.Molar mass of acetic acid is 60.05 g/mol.Mass of CH3COOH = Moles of CH3COOH × Molar mass of CH3COOH= 0.0039 moles × 60.05 g/mol= 0.234 gStep 5: Calculate the percent by mass of acetic acid in the vinegar.Percent by mass of acetic acid = (Mass of CH3COOH / Mass of vinegar solution) × 100%= (0.234 g / 10.05 g) × 100%= 2.33%.

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Answer:

There are three main types of chemical formulas: empirical, molecular and structural. Empirical formulas show the simplest whole-number ratio of atoms in a compound, molecular formulas show the number of each type of atom in a molecule, and structural formulas show how the atoms in a molecule are bonded to each other.