a chemistry student found the density of freon-11 (cfcl3) to be 5.58 g/l under her experimental conditions. her measurements showed that the density of an unknown gas was 4.38 g/l under the same conditions. what is the molar mass of the unknown? a. 96.7 g/mol b. 108 g/mol c. 127 g/mol d. 165 g/mol e. 175 g/mol

The volume of N2O3 produced is 5.6 L.

What is Ideal gas law ?

The ideal gas law (also called the perfect gas law), the relationship between the pressure P, volume V, and temperature T of a gas in the boundary region between low pressure and high temperature. Gas molecules move almost independently. each other. In such cases, all gases obey an equation of state known as the ideal gas law:

PV = nRT, where n is the number of moles of gas, R is the universal (or complete) gas constant, 8.31446261815324 Joules/ Kelvin/Kelvin (The universal gas constant is defined as Avogadro's number NA multiplied by Boltzmann's constant k.) In the International System of Units, energy is joules, volume is cubic meters (m3), force is newtons (N), and pascals Pressure in (Pa), where 1Pa = 1N/m2. A force of 1 Newton moving a distance of 1 meter does 1 Joule of work. Therefore, the product of both PV and nRT has the dimension of work (energy).

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The mass percent (m/m) of a solution is 21.64%.

A concentration or a component in a specific mixture can be expressed as mass percent. The mass percentage that indicates the mass of solute present in a given mass of solution can be used to describe the composition of the solution. In terms of mass or moles, the solute's concentration is expressed.

The general formula for a solution's mass percent is:

% m/m = [grams of solute] / [grams of solution] × 100

A solution is made up of both solute and solvent in grams.

So, here's the issue:

Solute = NaCl =mass of solute = 47.50g

Solvent = H2O =mass of solvent = 171.9g

mass of solution =47.50 g +  171.9g = 219.4g

% m/m = [47.50 / 219.4] ×100 = 21.64%.

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Answer:                                                                                                                          

Explanation:

There are two potassium ions and one carbonate ion in the potassium carbonate formula unit.

The smallest unit in an ionic compound is known as a formula unit. It displays the ion ratio in the molecule. The formula unit for potassium carbonate is K2CO3. We can observe that there are two potassium ions and one carbonate ion in this formula unit.

In recent years, potassium carbonate (K2CO3) has been extensively employed as a mild base catalyst in several chemical processes, including Knoevenagel and Nitroaldol Condensation (18), O-alkylation (19), the production of 2H-chromenes (20), and monomethylation reactions (18). (22).

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Beside information on chemical concentration add water temperature, water pressure should also be posted on dish washing machines.

Temperatures for dishwashers  are fixed by the manufacturer to make sure it’s the most efficient that it can be. An average dishwasher temperature runs its main cycle at about 130-140°F.1 This is because the temperature of water in the dishwasher needs to be hot enough to ensure that the detergent is fully dissolved and activated, while also dislodging any leftover food and grease. During the rinse phase, the water is heated to slightly higher temperatures of up to 180°F to make sure the dishes are safe to eat from.2 The high heat water also helps with the drying as the dishes will be warm

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Mendeleev developed the periodic table, the element gallium had not yet been discovered because gallium has known biological value

There is a very close match lies between the gallium actual property and the properties that were predicted and this has helped a lot in gaining a wider acceptance periodic table of Mendeleev and he left blank spaces for the undiscovered element atomic masses 44 scandium 68 gallium 72 germanium and 100 techtanium and so certain element can be grouped together

The element has no known biological value and in nature gallium is never found as a free element and cannot be found in substantial amount in any minerals and the element which were unknown when Mendeleev gave his classification were geranium gallium and scandium and he left gap for the unknown element and gallium has the atomic number is 31 and atomic mass is 69.72

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When the age of ancient wooden objects is investigated then the ratio of U-238/PB-206 isotopic ratio needs to be investigated.

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The mass of the gaseous product that we obtain is  3.5 g.

We know from the law of the conservation of mass that the total mass of the reactants is equal to the total mass of the products. The meaning of this is that mass is neither created nor destroyed but the mass can be transformed from one form to another.

We have been told in the question that  a mass of 10.0 g is heated in a chemical reaction that produces a different solid substance and a gas, which escapes. Suppose the new solid substance has a mass of 6.5 g.

We know that the mass of the products is equal to the mass of the reactants and having known that we can write;

10.0 = 6.5 + x

Where x is the mass of the gaseous product

x = 10.0 - 6.5

= 3.5 g

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The pH of acid is less than 7 and that of water is 7. HCl is a strong acid and it have a pH of about 3. If we add HCl into water, the acidity of water increases and its pH becomes less in arrange of 4-5.

pH of a substance is the measure of its acidity of basicity. It is the measure of H+ concentration in the solution. Mathematically it is equal to negative logarithm of H+ ions concentration.

If a solution  has a pH below 7 it is acidic and if it is more than 7 the solution is basic. Acids are having more H+ ions and thus having lower pH. Hydrochloric acid is a strong acid and have a pH in range of 2-3.

Water is neutral. If any acid is added to water it turns to acidic pH. Hence if HCl is added to water, then the pH of water turn to 3-5 based on the concentration of acid.

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The new pH will be 0.499.

A way to gauge how basic or acidic a material or solution is. A pH of 7 indicates neutrality on this scale, which implies it is neither acidic nor basic. It is more acidic and basic if the pH value is less than or equal to 7, respectively.

There are two ways to measure pH: colorimetrically using indicator fluids or papers, or electrochemically, which is more precise and uses electrodes and a millivoltmeter (pH meter).

pH = -log (H₃⁺O)

Thus, it is possible to state that the solution's pH will be after diluting it.

[tex]pH_{dil}[/tex] = -log [tex](H^{+} _{{} 3} 0)_{dil}[/tex]

[tex]pH_{dil}[/tex] = -log [tex](H^{+} _{{} 3} 0)_{dil}[/tex]/2

[tex]pH_{dil}[/tex] = -log  (H₃⁺O)₀ - log2

pH₀ = -log  (H₃⁺O)₀

pH₀ =  -log (1.58)

pH₀ = 0.198

[tex]pH_{dil}[/tex] = log2 +pH₀

[tex]pH_{dil}[/tex] = log2 +0.198

[tex]pH_{dil}[/tex] = 0.499.

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oose each ethanol functional group in the preceding molecule that, when subjected to pcl3 or pbr3, would result in the formation of an alkyl halide at position R3COH.

A is the smallest component of a chemical that keeps its content and properties. It is made up of two or even more atoms that are joined together by chemical bonds. Chemistry is built on molecules. The chemical name and a subscript indicating the number many atoms are used to identify molecules.

Molecules are created when atoms come together. One hydro (H) ions one and oxygen (O) atom make up the three atoms that make up a water molecule. Because of this, water is occasionally abbreviated as H2O. There are thousands of water molecules in a single drop of liquid.

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Decide what the reaction's byproducts will be. In other words, finish the right hand side of a chemical formula. A balanced equation is a must  NaOH + HI = H2O + NaI.

Resistance in resistance to a power, influence, or movement is a reactionary act, process, or occurrence. especially: a reaction to a particular treatment, circumstance, or stimulus; leaning toward a past and typically antiquated political or social system or policy.

A physical response is a reaction that modifies the physical characteristics of an item or material Physical characteristics include things like mass, volume, and density. The definition of a physical reaction is a response in which molecules rearrange one another but do not undergo chemical change.

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Volume rises when temperature rises and pressure decreases, and vice versa. A gas's volume is inversely correlated with its temperature and inversely correlated with its volume.

Regulations governing how a gas's volume, pressure, and temperature are related Robert Boyle's law, which asserts that a gas's pressure P changes inversely with its volume V at constant temperature, or PV = k, where k is a constant, is known as the Boyle law.

A fixed temperature prevents any change in the internal energy of an ideal gas since the internal energy is proportional to temperature. As a result, the first law, which deals with variations in internal energy, becomes 0 = Q - W, resulting in Q = W.

When a gas is held at a constant temperature, its volume is inversely proportional to the pressure at which it is measured.

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The final temperature of the mixture is -9.1°C.

Higher body temperatures release heat while lower body temperatures absorb it. The law of conservation of energy is demonstrated by the calorimetric principle, which states that the total amount of heat lost by a hot body is equal to the total amount of heat gained by a cold body.

Here,

Mass of water [tex]m_{w}[/tex]  =500g

Mass of ice [tex]m_{i}[/tex] = 100g

Specific heat of water = 1 cal g⁻¹°c⁻¹

Specific heat of ice = 80 °cal g⁻¹

Let T represent the mixture's final temperature.

How much heat water loses

[tex]m_{w} s_{w}[/tex](∆T)w = 500×1(50-T)

Amount of heat that ice absorbs

[tex]m_{i} L_{fi}[/tex]+[tex]m_{i} s_{w}[/tex](∆T)i = 100×80×100×1(T-0)

In accordance with the calorimetry principle:

Heat gained minus Heat Lost

500×1(50-T) = 100×80+100×1(T-0)

500(50-T) = 8000+100T

2500-500T = 8000+100T

2500-8000 = 100T+500T

-5500 =600T

T = -5500/600

T = -9.1°C.

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The atoms of a specific element is A zinc Zn atom containing 30 protons inside the nucleus and 30 electrons outside the nucleus.

Each element's atoms contain a characteristic number of protons and electrons. The number of protons determines the atomic number of an element and is used to distinguish one element from another. All atoms of a given element are identical in that they have the same number of protons, which are one of the building blocks of an atom.

Atoms of different elements have different numbers of protons, so they are also different from atoms of all other elements. Atoms can only have electrons and protons, but neutrons are the correct description for an element's atom. There are two properties that can be used to identify an element. Atomic number or number of protons in an atom. The number of neutrons and the number of electrons are often the same as the number of protons.

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The amount of water removed from every kilogram of commercial sea salt would be 27.57 kg.

Seawater contains 3.5% sodium chloride by mass. This means every 1 kg of seawater contains 0.035 kg of sodium chloride.

Sea salt contains about 10% water. This means every 1 kg of sea salt contains 0.1 kg of water.

In order to calculate the amount of water removed from every kilogram of commercial sea salt produced, we need to know the amount of seawater that will give 1 kilogram of sea salt.

We said every 1 kg of seawater contains 0.035 kg of salt. How many 0.035 kg can be found in 1kg?

1/0.035 = 28.57

This means 28.57 kg of seawater would need to be processed in order to have 1 kg of salt. Thus, the amount of water removed can be calculated as:

28.57 - 1 = 27.57 kg

In other words, about 27.57 kg of water is removed for every kilogram of commercial salt produced.

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The charges and size of the ions affect the magnitude of the lattice energy for an ionic compound. Therefore, option (a) and (c) is correct.

Lattice energy can be described as the heat of formation when 1 mole of a crystalline ionic compound is produced from its constituent ions in their gaseous state.

For example, the lattice energy of a NaCl compound is the energy change of reaction when Na⁺ ions and Cl⁻ ions react to generate a NaCl crystal, which is -786 kJ/mol.

At constant pressure, the relation between lattice energy and lattice enthalpy is given by:

ΔU (lattice) = ΔH (lattice)- PΔV

Lattice energy for an ionic compound is directly proportional to the charge on ions and inversely proportional to the interionic distance between ions or the size of the ions.

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One mole of Al(NO3)3 is equal to 212.99623 grams, while one mole of Carbon Tetrachloride is equal to 153.8227 grams and three moles are equal to 461.4681 grams of Carbon Tetrachloride.

Because it is simple to manufacture, compatible with explosives, and produces a very high enthalpy of oxidation, aluminum is commonly employed. These reactions make aluminum the perfect component for increased blast applications, where a "thermobaric" effect is produced by a late reaction with air.

The effects of Al's toxicity include oxidative stress, immunologic changes, genotoxicity, pro-inflammatory effects, peptide denaturation of transformation, enzymatic malfunction, metabolic derangement, amyloidogenesis, transmembrane disruption, iron dyshomeostasis, apoptosis, necrosis, and dysplasia.

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Distillation is a method of separating mixtures, which is based on difference in the volatility of a boiling liquid mixture. The property of a component which separates the 2-propanol from the water is a boiling point.

In the distillation method, the two components are separated based on their different boiling points. For example, in the mixture of 2-propanol and water, propanol has less boiling point than the water, which is 82.5°C. So when we apply heat to the mixture, 2-propanol is separated in the form of vapour and it is immediately cooled by the action of cold water in a condenser. The another examples of distillation method is purification of alcohol, separation of gasoline from crude oil etc.

Therefore, the property of the components that makes it possible to use distillation to separate the 2-propanol from water is boiling point.

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HSO⁻³ is an amphoteric substance (in this reactions is ion that can react both as an acid and as a base).

The law of mass action, which defines equilibria in a more comprehensive fashion, has an immediate consequence called the dissociation constant. When speaking of salts, the ionization constant is another name for the dissociation constant. The term "association constant" refers to the inverse of the dissociation constant.

Kb is short for base dissociation constant. It is explained as the degree of base dissociation in solution.

Acid dissociation constant is referred to as Ka. It displays the degree of dissociation of an acid in a solution.

When HSO₃⁻ acts as acid, it gives protons to water:

HSO₃⁻(aq) + H₂O(l) ⇄SO₄²⁻(aq) + H₃O⁺(aq).

Ka = [SO₄²⁻] · [H₃O⁺] / [HSO₃⁻].

When HSO₃⁻ acts as base, it accepts protons from water:

HSO₃⁻(aq) + H₂O(l) ⇄ H₂SO₄(aq) + OH⁻(aq).

Kb = [H₂SO₄] · [OH⁻] / [HSO₃⁻].

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The statement is accurate about dominant alleles is they are expressed whenever present.

The relation between two versions of a gene are called as dominant. when the individual receive the two version of gene of each parent of gene known as alleles. if gene of alleles are different , one allele will be expressed as the dominant gene. Dominant alleles are expressed as phenotypic cell. Dominant alleles are indicated by the uppercase of a letter. so the dominant allele is that will be more powerful than the another allele.

Thus, The statement is accurate about dominant alleles is they are expressed whenever present.

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Answer:

1- fission

2- fusion

3- radioactive decay

4- gamma

5- alpha particle

6(high speed electron)- beta rays

7-plasma

the expression for the equilibrium constant (ka) of acetic acid is :

CH₃COOH   +  H₂O   ⇄  CH₃COO⁻    +    H₃O⁺

Ka = [CH₃COO⁻ ][H₃O⁺] / [ CH₃COOH ] [ H₂O  ]

The acetic acid is the weak acid . it forms a homogeneous mixture with water and form H₃O⁺. The acetic acid equilibrium is given as :

CH₃COOH   +  H₂O   ⇄  CH₃COO⁻    +    H₃O⁺

The equilibrium constant ca be written as :

Ka = [CH₃COO⁻ ][H₃O⁺] / [ CH₃COOH ] [ H₂O  ]

Thus, the expression for the equilibrium constant (ka) of acetic acid is :

CH₃COOH   +  H₂O   ⇄  CH₃COO⁻    +    H₃O⁺

Ka = [CH₃COO⁻ ][H₃O⁺] / [ CH₃COOH ] [ H₂O  ]

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Answer: 1.Think of the English alphabet. Millions of words can be made from only 26 letters! The same thing is true of elements and compounds. Elements are the basic form of matter which cannot be broken down any further. A few common elements make most of the planet’s many compounds. Different compounds combine to make all of the things around us. These include rocks, air, water, and even people.2     Let’s take a trip to Maui in the Hawaiian Islands. You must cross the Pacifi c Ocean. You travel over seawater made of hydrogen, oxygen, sodium, chlorine, and traces of other elements. Pure water has only hydrogen and oxygen. When you get to the island, you walk on the sand. Sand is tiny bits of worn-out rock mostly made of oxygen and silicon. A breeze hits your face. The air is made of nitrogen, oxygen, a little argon, and carbon dioxide. There are also very small amounts of other gases. 3     As you walk around, you see volcanic rocks and mountains on the island. They are made of mixtures of oxygen and silicon, with magnesium, aluminum, potassium, iron, and small amounts of other elements. Green volcanic rock is also common on the island. It has a heavy concentration of iron and magnesium. 4     You also see all the plants and animals. The Hawaiian Islands contain much diversity. You see many beautiful trees, bushes, and fl owers. You see a Hawaiian tree, an orchid on that tree, a beetle crawling on the ground, and a native Hawaiian. These are all examples of living matter made of the elements hydrogen, oxygen, carbon, and nitrogen. Hydrogen is the most abundant element in living matter. 5     As you leave Hawaii, you marvel at what you’ve seen. You are amazed at how so many compounds can be made from so few elements. A few simple elements can combine to make many, many different things.

Explanation:

The periodic table has a variety of different elements. Some substances are radioactive, some are dangerous, and some are noble gases.

The term "periodic table" refers to a table where elements having characteristics such as metals, non-metals, metalloids, and radioactive elements are arranged in increasing atomic number.

Atomic radii drop as we move from left to right in the periodic table due to an increase in effective nuclear charge. Only the number of electrons grows, increasing the number of protons in the nucleus and, consequently, the effective nuclear charge of the atom, which causes the size of the atom to decrease. There is no increase in the number of shells.

Consequently, there is a tendency for atomic radii to decrease as one proceeds to the right is caused by the effective nuclear charge growing over time.

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The percent of a present amount of radioactive radium after 100 years is 95.76%

Radium:

Radium is a chemical element with the symbol Ra. It is the sixth element in the Group 2 of the periodic table. Pure radium is silvery-white in color, but it combines with nitrogen readily on exposure to air and forms a black surface layer of radium nitride.

Here we have to find the percent of the present amount of radioactive radium remains after 100 years.

As we know:

y = a[tex]e^{-bt}[/tex]

y = a (at t =0)

as half-life:

0.5a = a[tex]e^{1600b}[/tex]

ln 0.5 = -1699b

b = -log 0.5/ 1600

Now model is:

y = a[tex]e^{log 0.5/1600 t}[/tex][tex]e^{log 0.5 / 1600 t}[/tex]

at t = 100

y = 0.95768

So there will be 95.76% radioactive radium after 100 years.

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The strong acid and strong base has high rate constant of dessociation. Weak acid and base are the one whose rate constant for the dissociation is low, they do not dissociate readily in water. Therefore, the correct option is option A.

Acid is a solution which releases H⁺ hydrogen ion when dissolved in water. Base are the solution which releases hydroxide ion OH⁻ ion when dissolved in water.

The balanced equation is

H₂PO[tex]_4[/tex]+H₂O → H[tex]_3[/tex]O+ + HPO[tex]_4[/tex]²-

H₂PO[tex]_4[/tex] is a acid and if we remove one hydrogen ion from this then we get an anion called conjugate base. The pair is called acid base conjugate pair. H₂O is acid over here and if we give one hydrogen ion to this then the cation that we will get is called conjugate acid. The pair is called base conjugate acid pair.

Therefore, the correct option is option A.

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Answer:

Common physical changes include melting, change of size, volume, color, density, and crystal form.

Explanation: