A chemist is studying the composition of a sample of ocean water. He gently heats the sample to evaporate the water, leaving him with the solid substances that had been dissolved in the sample. Next, he performs a series of procedures to separate the solid substances from each other. Finally, he measures how much of each solid he has obtained. What substance would he probably have the most of

If 87 grams of K₂SO₄ is dissolved in enough water to make 250 milliliters of solution,  the concentrations of the potassium [K⁺] is 4 M and the sulfate ions [SO₄²⁻] is 2 M.

The molar mass of the  K₂SO₄ = 174 g/mol

The mass of the  K₂SO₄ = 87 g

the moles of the  K₂SO₄ = 87 / 174

                                         = 0.50 mol

moles of K⁺ = 0.50 × 2

                    = 1 mol

moles of SO₄²⁻ = 0.50 × 1

                          = 0.50

The concentration of [K⁺] = 1 / 0.250 = 4 M

The concentration of [SO₄²⁻] =  0.50 / 0.250 = 2 M

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An acidic solution has a pH over 7 and contains more hydrogen ions than hydroxide ions. Any aqueous solution with a pH lower than 7.0 ([H+] more than 1.0 x 10-7M) is said to be acidic.

A  acidic solution that uses water as its solvent is said to be aqueous. Acidic solutions are sour in contrast to alkaline solutions, yet it's never a good idea to taste an unidentified solution. Any solution that contains more hydrogen ions per volume of solution than water is an acidic solution; contrasted with acidic solutions are basic or alkaline solutions. Atomic number 1 and the letter H stand for the chemical element hydrogen. The element hydrogen is the lightest.

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Answer:

The net ionic equation of the given reaction is:

Mg (s) + 2 H⁺ (aq) → Mg²⁺ (s) + H2 (g)

Explanation:

When magnesium metal (Mg) is treated with hydrochloric acid (HCl), then it displaces the hydrogen gas from the acid

.- Magnesium gets attached with the chlorine and hydrogen gas is evolved as a product in the reaction.

- We have not mentioned chlorine in the reaction as it is not undergoing any change during the reaction.

To solve this we must be knowing each and every concept related to chemical Compound. Therefore, The other 2 points of the water  molecule are the paired two electrons from the oxygen atom and one electron from each H atom.

Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.

There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. The other 2 points of the water  molecule are the paired two electrons from the oxygen atom and one electron from each H atom.

Therefore, The other 2 points of the water  molecule are the paired two electrons from the oxygen atom and one electron from each H atom.

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The metallic qualities drop and the non-metal characteristics rise as we progress from left to right, which results in a decrease inside the reactivity of such elements.

Metal reactivity is influenced by their propensity to lose electrons. The valence electrons could be simply eliminated as the atomic size grows, resulting in the formation of positive ions. As we proceed down the periodic table, the atomic size of metals gets bigger. The propensity to acquire electrons determines how reactive non-metals are.

Metal fosters strong down groups and declines across intervals from left to right. Indicators of nonmetallic properties rise from left to right and fall down groupings. Nonmetal reactivity goes up groups as well as down groups, increasing from left to right.

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The least like an ideal gas at room temperature is Helium.

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In order to produce a nucleotide, the combinations 11, 12, and 13 may be combined.

The basic unit of DNA and RNA are nucleotides. Genetic material is present in them. Since many biological reactions involving enzymes require coenzymes, nucleotides serve in this capacity. ATP serves as the body's energy storage system.

A phosphodiester bond forms when the 5' phosphate group of one nucleotide and the 3'-OH group of another nucleotide come together during the incorporation of nucleotides into DNA (see below). Phosphate-sugar-phosphate-sugar-phosphate forms the "backbone" of each DNA strand in this way.

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The argument that supports the claim that dissolving solid calcium chloride (CaCl2) in water is a chemical change is A. The ionic bond among calcium and chloride ions has been broken..

When solid calcium chloride is added to water, the ionic bonds between the calcium ions (Ca2+) and chloride ions (Cl-) are broken apart by the polar water molecules. The calcium ions and chloride ions are then surrounded by the water molecules, forming a new chemical compound called calcium chloride hydrate (CaCl2*xH2O) which is different from the original solid calcium chloride. This process is a chemical change because it creates new substances and the original chemical bonds are broken and new bonds are formed.

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the complete question is:

Which of the following arguments supports the claim that dissolving calcium chloride (CaCl2) in water results in a chemical change?

A. The ionic bond among calcium and chloride ions has been broken.

B. By evaporating the water, the solid calcium chloride can be recovered.

C. The ions found in the solid remain in the solution and have not changed.

D. Ions are attracted by the polar water molecules.

From 5.5 grammes of sodium fluoride, 4.1 grammes of magnesium fluoride will be created. The inorganic substance MgF2 stands for magnesium fluoride.

It naturally occurs as the rare mineral sellaite and is a white crystalline salt that is transparent over a broad range of wavelengths and has commercial use in optics used in space telescopes. With the formula NaF, sodium fluoride (NaF) is an inorganic substance. It is utilised in minute quantities in toothpaste, metallurgy, and as a flux in addition to fluoridating drinking water. It is a white or colourless substance that easily dissolves in water. Pharmaceutical manufacturers frequently use it as a source of fluoride. Mass in grammes is equal to 0.06548 times 62.301 grammes of MgF2.

= 0.06548 /62.301 = 4.1grams

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The reaction that shows oxidation is the one that has been shown in option D.

We have to know that the process that we call oxidation would have to do with the loss of the electrons that we have in a system. If we are dealing with a neutral atom that has been oxidized then we would see an increase in the oxidation number of the atom. This same effect would be seen if we are looking at the oxidation of any other chemical specie that is under consideration.

We need to look at the reactions that have been shown in the options that we have and then compare it with the overall redox reaction equation that we see at it has been shown in the reaction that has been attached to the question that we have in the attachment that is shown above here.

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The empirical formula of the compound is MnO2.

The empirical formula of a substance is the simplest whole-number ratio of atoms in a compound. To find the empirical formula of a compound, you first need to determine the number of moles of each element present in the compound.

Given that the percent composition of the compound is 70% Mn and 30% O, we can assume that 100g of the compound contains 70g Mn and 30g O.

To convert mass to moles, we need to know the molar mass of each element. The molar mass of Mn is 54.9380 g/mol, and the molar mass of O is 16.00 g/mol.

So, we have:

The simplest whole number ratio of Mn and O that gives 1.27 moles Mn and 1.87 moles O is 1:2.

Therefore, the empirical formula of the compound is MnO2.

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Answer:

SnO2+2H2 - Sn +2H2O

50g of tin plus 32g of oxygen-36g of H2O

82g- 36g

57.6g- x

cross multiply

82xg= 2073.6g

xg = 2073.6/82

Xg= 25.28g

Therefore the mass of water consumed in the reaction is 25.28g

Li2O > K2O > Rb2S is the order of given compounds lattice energy in the increasing order

Lattice energy is a measure of the strength of the electrostatic attraction between the positively charged cations and negatively charged anions in an ionic compound. The greater the lattice energy, the stronger the electrostatic attraction and the more stable the compound.The most common method for determining lattice energy is the Born-Haber cycle. This method uses thermochemical data of the individual steps in the formation of an ionic compound to calculate the lattice energy. However, it is often impractical to use this method in a test environment, so a more practical method that is used to compare lattice energies of different compounds is the use of the Coulomb's law which relates the lattice energy to the charge product of the cations and anions and the distance between them.

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Answer:

186.25

Explanation:

KCL= 74.5 (molar mass)

2.5*74.5= 186.25

A blend of dyes called a universal indicator gradually changes color throughout a pH range of 4 to 14. The color serves as a direct indicator of pH.

Thymol blue, methyl red, bromothymol blue, and phenolphthalein are the primary ingredients of a universal indicator in the form of a solution. Colors ranging from yellow to red denote an acidic solution, whereas colors ranging from blue to violet denote an alkaline solution and green denotes a neutral solution. Substances called indicators are those whose solutions change color as the pH changes. We refer to these as acid-base indicators. The conjugate base or acid versions of these typically weak acids or bases have various hues because of variations in their absorption spectra.

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As a result, 6.022 x 10 23 molecules of water weigh 18.02 g. A mole of sodium chloride (6.02 x 1023 formulas) weighs 58.44 g.

A substance's mole is equivalent to 6.022 x 1023 of that material (such as atoms, molecules, or ions). One mole, or 6.022 x 1023 molecules, is equal to one gram's worth of any given substance's molecular mass. Thus, a mole of oxygen (O2) weighs 32 kilos and has a molecular mass of 6.022 1023.

12 grams of pure carbon-12 weigh exactly one mole, or 6.022 x 1023 atoms, making one mole equivalent to 12 grams of pure carbon-12. • Avogadro's Number refers to the quantity of particles contained in one mole (6.0221421x1023).

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The loss of mass can be accounted for by the energy released during the reaction. When the sulfuric acid and sugar mix, the reaction produces carbon dioxide gas, which has a much lower mass than the original reactants. This is because the reaction releases energy as heat, which causes the molecules to break apart and form the gaseous carbon dioxide.

Molecule is the smallest unit of a substance that has all the properties of that substance and is made up of two or more atoms bonded together. Molecules can either be made of elements or a combination of elements and compounds. Molecules can be described as the building blocks of matter, made up of atoms. Atoms are made up of protons, neutrons, and electrons, and the arrangement of these particles determine the type of molecule.

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The volume of the cube that is submerged in the liquid would be 36.0 ml.

Submerged refers to something that is completely covered or surrounded by a liquid, usually water. Submerged objects are often completely or partially underwater, and can refer to anything from a submerged shipwreck to a submerged rock formation. Submerged objects can also refer to objects that are partially or totally surrounded by the water or liquid, such as a submerged tree or submerged vegetation. Submerging can also refer to objects that are pushed underwater or forced down due to pressure, such as a submarine. Submerging can also refer to a process in which an object is submerged and then brought back up, such as in underwater welding or archaeological excavations.

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The two quantities in this module for which we will develop unit factors to do dimensional analysis with chemical substances are mass (usually measured in grams) and volume (usually measured in liters).

Unit factors are developed to convert between two different units of measurement, in this case, mass and volume. We can do this by multiplying the given value by the appropriate unit factor to convert the given value from one unit to the other. For example, if we are given a mass of 10 grams, we can convert this to liters using the unit factor 1 gram = 1 liter. Thus, 10 grams = 10 liters.

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Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore,  the volume of oxygen needed to completely react with 171.9 g of S8 at STP is 180.09L.

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.

S[tex]_8[/tex](s) +12O[tex]_2[/tex](g) →8SO[tex]_3[/tex](l)

171.9 g of S8

mole of  S[tex]_8[/tex]=  171.9 g/ 256.52g/mol

                 =0.67mol

The mole of oxygen = 12×0.67

                                = 8.04mol

volume of oxygen= 22.4× 8.04

                            =180.09L

Therefore,  the volume of oxygen needed to completely react with 171.9 g of S8 at STP is 180.09L.

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The gravitational force of attraction between the two objects would be 1.1858 x [tex]10^{-6[/tex] Newton.

The gravitational force of attraction between two objects of mass m1 and m2 is proportional to the product of the masses of the two objects and inversely proportional to the square of the distance between the two objects.

This is mathematically expressed as follows:

Gravitational force (F) = [tex]Gm_1m_2/d^2[/tex]

Where G is the universal gravitational constant and d is the distance separating the two masses.

In this case:

m1 = 8,000 kg

m2 = 5.0 kg

G = 6.67 x [tex]10^{-11[/tex] N m2 / kg2

d = 1.5 m

F = 6.67 x  [tex]10^{-11[/tex] x 8,000 x 0.5/1.5 x 1.5

  = 26680 x  [tex]10^{-11[/tex]/2.25

  = 11857.77 x  [tex]10^{-11[/tex]

   = 1.1858 x [tex]10^{-6[/tex] Newton

In other words, two spherical objects of masses 8,000 kg and 5.0 kg separated by a distance of 1.5 would have a gravitational force of attraction of 1.1858 x [tex]10^{-6[/tex] Newton between them.

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Diatomic elements are elements that exist as molecules composed of two atoms of the same element.

Diatomic molecules are molecules composed of two atoms, such as Oxygen (O2), Hydrogen (H2), Nitrogen (N2), and Fluorine (F2). Diatomic molecules are the most common type of molecules in nature and are found in all three states of matter (solid, liquid, and gas). Diatomic molecules contain only two atoms and do not contain any other elements or molecules.

This is in contrast to other elemental substances, which exist as individual atoms or molecules composed of different elements. Diatomic elements have unique chemical and physical properties due to the strong bond between the two atoms.

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'The temperature of the reaction mixture increases'  would be evidence that a chemical reaction took place.

What is a dilute solution?

A dilute solution is a solution that contains fewer solute particles than a more concentrated solution. Dilute solutions are generally less concentrated than more concentrated solutions and are often made by adding more solvent to the solution.

When a chemical reaction takes place, energy is released in the form of heat. This increase in temperature is basically known as an exothermic reaction. An increase in temperature is a sign that a chemical reaction has taken place, as the reaction mixture is absorbing the energy released from the reaction.

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The order of the reaction is First Order with respect to the hydroxide ion (OH-) can be determined by examining the slope of the line generated in the plot of ln(k) vs ln[OH-]. In this case,

the slope of the line is 1.18, which indicates that the reaction is first-order with respect to OH-. The order of a chemical reaction refers to the power to which the concentration order of a reactant is raised in the rate equation. The rate of a reaction is typically described by the rate equation, which is a mathematical expression that relates the rate of the reaction to the concentrations of the reactants. The order of a reaction is determined experimentally by measuring the rate of the reaction at different concentrations of the reactants and fitting the data to a rate equation.

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The number of moles of ammonium chloride present in a solution created by dissolving 12 grams of ammonium chloride in water to make 255 ml solution is 0.224 mol.

The number of moles of a substance is defined as the ratio of the mass of the substance to the molar mass of the substance. It is denoted by "n". It is given as

n=mass/molar mass

Given,

mass of ammonium chloride= 12 grams

we know that,

atomic mass of Nitrogen(N) = 14g /mol

atomic mass of Hydrogen (H) = 1 g/mol

atomic mass of Chlorine (Cl)= 35.5 g/mol

molar mass of ammonium chloride (NH₄Cl)

= ( 14+ 1×4 + 35.5) g/mol

=53.5 g/mol

therefore,

number of moles of ammonium chloride

= mass/molar mass

=12g/53.5gmol⁻¹

=0.224 mol

Thus, 0.224 moles of ammonium chloride are present in the resulting solution.

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Answer:

Explanation:

Pb(OH)2 + 2NaOH → Pb(OH)2 + 2NaOH

The balanced equation would be PbO + 2NaOH → Pb(OH)2 + Na2O

The reactant PbO is a lead oxide which is an acidic oxide, it reacts with NaOH, a strong base, to form Pb(OH)2, a lead hydroxide, which is a salt of lead, and Na2O which is sodium oxide , a base.

Pg denotes gauge pressure, which is related to absolute pressure as follows: Pa is the local atmospheric pressure, and pg is equal to p - pa.

An automobile tire gauge, for instance, reads 32.0 psi. 14.2 psi is the atmospheric pressure in the area. The gauge pressure equation states that gauge pressure equals the difference between absolute pressure and atmospheric pressure: P G = P P A, or PG=PPA. A tire pressure gauge, for example, monitors the pressure in the tire above ambient pressure. Gauge pressure is the pressure in particular items. Thus, gauge pressure plus atmospheric pressure add up to the total pressure, or absolute pressure: Pabs=Pg+Patm Pabs is the absolute pressure, Pg is the gauge pressure, and Patm is the atmospheric pressure. P abs = P g + P atm

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The concentration of the standard solution (in M) if 15 mL of a 0.2512 M Co(NO3)2 stock solution is added to a 50 mL volumetric flask and diluted to the mark is  0.07536M.

Given volume of Co(NO3)2 stock solution (V1) = 15mL =0.015L

Concentration of Co(NO3)2 stock solution is (M1) = 0.2512M

Volume of  volumetric flask (V2) = 50mL = 0.050L

Concentration of standard solution = M2

The number of moles of solute divided by the number of liters of solution is the definition of molarity, a concentration unit in chemistry.

We know that M1V1 = M2V2. Such that,

0.2512 x 0.015 = M2 x 0.050

M2 = 0.07536M

Hence the required concentration of standard solution is  0.07536M

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Answer:

A

Explanation:

because its the only one that can be tested