Puffy Chalmers was in his room, admiring his Mr. Drought mask, when his mother, Cookie Chalmers, barged into his room. She was so tired of the mask, she ripped it up and threw the pieces into a metal trash can. Then she pulled a bottle of acid out of her purse, and poured it on the mask pieces causing them to bubble, smoke, and change color. Did she change the mask physically or chemically? Explain your answer using evidence and your knowledge of physical and chemical changes. Help

The equivalent point's pH is 3.60.

A numerical measure of how acidic or basic aqueous or other liquid solutions are is called pH, and  The expression, which is widely used in chemistry, biology, and agronomy, translates the hydrogen ion concentration, which normally ranges between 1 and gram-equivalents per liter, into values between 0 and 14. Since pure water has a pH of 7, or gram-equivalents per liter of hydrogen ions, it is neutral (neither acidic nor alkaline). An alkaline or basic solution has a pH over 7, whereas one with a pH below 7 is described as acidic.

HNO2 = 0.100M

KOH= 0.200M

pKa = 3.34

using a formula

pH = pKa + log (salt/acid)

= 3.34 + log (0.200/0.100)

= 3.34 + log 2

= 3.34 + 0.30

= 3.60

The equivalent point's pH is 3.60.

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The element box contains name and symbol of the element, number of protons and electrons, atomic mass, and electron configuration.

Each key incorporates an detail's name, precise symbol, atomic weight and atomic variety. Oxygen, for example, has an atomic variety of 8, an atomic weight of 15.996 and a completely unique symbol, O.  Each container represents an detail and incorporates its atomic size, symbol, common atomic mass, and (sometimes) name. The factors are organized in seven horizontal rows, referred to as intervals or series, and 18 vertical columns, referred to as groups. The container containing every detail's records is called the detail key. The table is split into 4 more or less square regions referred to as blocks. The rows of the desk are referred to as intervals, and the columns are referred to as groups. Elements from the equal institution of the periodic table display comparable chemical characteristics.

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According to  the concept of molar mass and stoichiometry, the  mass of copper(II) sulfate  that would remain after removing all the water from 55 g of CuSO₄ · 5 H₂O is 35.18 g.

Molar mass of a compound or a molecule is defined as the mass of the elements which are present in it.The molar mass is considered to be a bulk quantity not a molecular quantity. It is often an average of the of the masses at many instances.

Molar masses of an element are given as relative atomic masses while that of compounds is the sum of relative atomic masses which are present in the compound.

In copper(II) sulfate , 249.68 g of copper (II) sulfate has 90 g water, thus 55 g of copper (II) sulfate will have 55×90/249.68=19.82 g water, so mass of copper sulfate= 55-19.82=35.18 g copper(II) sulfate.

Thus,35.18 g copper(II) sulfate would remain after removing all the water from 55 g of CuSO₄ · 5 H₂O.

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The elements with the highest ionization energy are the noble gases, which are located in the upper right corner of the periodic table. These elements include helium, neon, argon, krypton, xenon, and radon. These elements have a full valence electron shell, meaning that they have the maximum number of electrons possible in their outermost energy level. This makes them very stable and resistant to chemical reactions, as they do not have any electrons that can be easily removed or added.

As a result, they have very high ionization energy, meaning that a large amount of energy is required to remove an electron and form an ion. Due to these properties, these elements are not readily reactive with other elements and tend to exist as diatomic molecules or as individual atoms. These elements are used in a variety of industrial, medical, and everyday applications such as in lighting, refrigeration, and as inert gases in medical equipment and in the manufacturing of semiconductors.

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The concentration of hydroxide ions in the solution is 0.0428 M.

A molecule or atom that has a net electrical charge is called an ion.

The balanced equation for the reaction between HCl and Ca(OH)2 is:

Ca(OH)2 + 2HCl -> CaCl2 + 2H2O

The number of moles of HCl added at the equivalence point can be found by multiplying the volume of HCl added (in liters) by its concentration in moles/liter:

moles HCl = (38.1 mL HCl x 0.028 mol/L HCl) / 1000 mL/L = 0.00107 mol HCl

The concentration of hydroxide ions can be found by dividing the number of moles of hydroxide ions by the volume of the solution:

[OH-] = moles OH- / L of solution

We know that the number of moles of HCl added is equal to the number of moles of OH- present, so:

[OH-] = 0.00107 mol OH- / (25.0 mL / 1000 mL/L) = 0.0428 M

Therefore, the concentration of hydroxide ions in the solution is 0.0428 M.

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The amount of energy used to heat the water from 0°C to 70°C is 8,786.4J.

The amount of energy used in heating a substance can be calculated using the following formula:

Q = mc∆T

Where;

According to this question, a student heated 30 milliliters of water from 0 degrees celsius to 70 degrees celsius.

Since 1mL of pure water equals 1 gram, then 30mL of water will equal 30grams of water.

Q = 30 × 4.184 × (70 - 0)

Q = 8,786.4J

Therefore, 8,786.4J is the energy used to heat the water sample.

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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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Based on the information, UV light is more likely to damage the material.

Due to the fact that the infrared light bounces off the quartz, which increases its energy, the quartz may become warm.

The colors of paper and fabric can deteriorate due to ultraviolet light from the sun. In the presence of ultraviolet light waves, the chemicals in colored dyes can degrade. Sunburns may also result from ultraviolet radiation.

Paper and other organic materials will deteriorate, bleach, and deteriorate due to ultraviolet radiation. All of these modifications may reduce readability, affect how well artwork is regarded for its aesthetic qualities, and restrict access to the information it contains.

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Photoautotroph has been derived from the combination of three words, photo -meaning "light", autos- meaning "self", and troph meaning "nutrition".

Land plants and photosynthetic algae are both photoautotrophs. These species contain pigments that can capture light, like chlorophyll. Origin of the word: photo- (light) + auto (self) + troph (nourishment). Autotrophs known as photoautotrophs generate complex chemical substances like proteins, lipids, and carbohydrates by absorbing light. Photosynthesis is the name given to this light-mediated process.

An energy-rich carbohydrate like glucose is produced by plants using carbon dioxide, inorganic salts, and water during a process called photosynthesis. As a byproduct, oxygen is also produced, other than glucose. Land plants and photosynthetic algae are both photoautotrophs. These species contain pigments that can capture light, like chlorophyll.

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Evaporation occurs when a liquid turns into vapour . The particles in the liquid gain energy and move faster and further until some of them escape from the surface and become a vapour

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The isotopic mass of the least abundant isotope will be 123.05 u.

Average atomic mass of X = 122.131 u

Assume most abundant isotope = Y and least abundant isotope = Z

Relative abundance (Y) = 61.35%

So,

Z = 100 - 61.35

Z = 38.65 %

Isotopic mass of Y= 121.552 u

Isotopic mass of Z = ?

To calculate the isotopic mass we use the following formula:

Average atomic mass = [(mass Y × percent abundance) + (mass Z × percent abundance)] / 100

put the values

122.131 = [(121.552 × 61.35) + (Z × 38.65)] / 100

12213.1 = (7457.22) + (Z × 38.65)

Z × 38.65 = 12213.1 - 7457.22

Z × 38.65 = 4755.88

Z = 4755.88 / 38.65

Z = 123.05

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The quantity of energy required to convert 0.562 kg ice at -20.0°C to steam at 250°C is equal to 1885.4 KJ.

The specific heat capacity can be described as the amount of energy needed to raise the temperature in one unit of material by one-degree celsius.

The addition or emission of heat from the system will the temperature of the substance will be changed:

Q = mCΔT

Given, the amount of ice, m = 0.562 Kg = 562 g

The change in the temperature = 100 -20 = 80°C

The specific heat capacity of the water, C = 4.18J/g°C

The specific heat capacity of the ice, C = 2.03 J/g°C

The phase transition from ice to steam:

H₁ = 562 × 2.03 × (0-(-20))

H₁ = 22,817 J = 22.8 KJ

The enthalpy of the fusion will be absorbed:

H₂ =  n × H(fus)

The number of moles of water = 562/18 = 31.22 mol

H₂ = 31.22 × 6.02 kJ/mol

H₂ = 187.95 KJ

Phase transition from water at 0°C to water at 100°C:

H₃ = 562 × 4.18 × 100

H₃ = 234 KJ

The phase transition from water at 100°C to steam at 100°C:

H₄ = n × H(vap)

H₄ = 31.22 × 40.7 kJ/mol

H₄  = 1270.65 KJ

The heat to make steam at a temperature of 250°C:

H₅ = m × S×ΔT

H₅ = 562 × 2.02 ×150 = 170 KJ

The total energy needed to convert  0.562 kg ice at -20.0°C to steam at 250.0°C:

H = H₁ + H₂+ H₃+ H₄ +H₅

H = 1885.4 KJ

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The composition of each compound as the mass percent of its elements is as follows:

Concentration is expressed as mass percent. Additionally, the ingredients in a particular mixture are described. Solution composition can be understood in terms of mass percent. It indicates the mass of solute present in a solution of a given mass. The amount of solute is expressed in mass or moles.

Mass Percent = (Component Mass ÷ Total Mass) x 100% or

(mass of solute ÷ mass of solution) x 100%

a. Sucrose (C₁₂H₂₂O₁₁) with molecular mass of 342.296 u composed of:

Carbon: (12 x 12.01) / 342.296 = 42.18%

Hydrogen: (22 x 1.01) / 342.296 = 6.44%

Oxygen: (11 x 16) / 342.296 = 51.38%

b. Aluminum sulfate (Al₂(SO₄)₃) with molecular mass of 342.14 u is composed of:

Aluminum: (2 x 26.98) / 342.14 = 3.99%

Sulfur: (3 x 32.06) / 342.14 = 4.57%

Oxygen: (18 x 16) / 342.14 = 87.44%

c. Magnetite (Fe₃O₄) with molecular mass of 231.534 u is composed of:

Iron: (3 x 55.85) / 231.534 = 71.83%

Oxygen: (4 x 16) / 231.534 = 28.17%

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Answer:

0.0272 moles

Explanation:

The number of moles of acid that were neutralized can be found by multiplying the volume of the base (in liters) by its concentration (in moles/liter) and then multiplying that value by the stoichiometric coefficient of the acid in the balanced chemical equation for the neutralization reaction.

To begin, we need to convert the volume of the base from milliliters to liters.

50.40 mL = 0.0504 L

Next, we can multiply the volume of the base (in liters) by its concentration (in moles/liter) to find the number of moles of base used in the titration.

0.0504 L * 0.542 M = 0.0272 moles

Since this is a neutralization reaction between a monoprotic acid and a strong base, the acid:base ratio is 1:1.

So the acid that has been neutralized is also 0.0272 moles.

0.384 moles of nitrogen atoms are inhales by the person in an average breath of air.

Avogadro constant is the number of molecules present in 1 mole of gas or a chemical compound. It is used to specify the atomic mass of a certain number of molecules in a substance or chemical compound or gas, in grams. Theses molecules may be atoms, neutron, proton, electron, etc. One mole of a substance contains 6.023 × 10²³ Molecules. In other words the atomic mass of a substance is the weight of 6.023 × 10²³ molecules.

So 2.31 × 10²³ atoms of nitrogen = (2.31 × 10²³)/(6.023 × 10²³)

= 0.384 moles

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The empirical formula of the compound with 0.123 moles of bromine and 0.123 moles of lead would be  PbBr.

The empirical formula of a compound is the chemical formula of the compound where the component atoms are in their simplest, whole-number ratios.

In this case, the compound contains bromine and lead:

Br = 0.123 mole

Pb = 0.123 mole

Dividing through by the smallest mole

Br = 0.123/0.123 = 1

Pb = 0.123/0.123 = 1

Thus, bromine and lead are present in a 1:1 ratio in the chemical formula.

In other words, the empirical formula of the compound containing 0.123 moles of bromine and 0.123 moles of lead is PbBr.

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A neutral atom and has 14 protons is Silicon

Each of the elements in the Periodic Table has an individual atomic number, or a specific number of protons in its nucleus.

The total number of protons that make up an atom's nucleus is represented by the atomic number of that atom, as is well known. We know that an atom has proton of 14, so the atomic number  of that neutral atom is 14. we can check on the periodic table an atom that have 14 atomic number is silicon.

Therefore, the neutral atom and has 14 protons is Silicon

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The percentage strength of the solution is 1%.

According to question,

we are given that the 20mg of cromolyn sodium in 2 ml of normal saline is taken.

Now, to find the percentage strength first know the meaning of percentage strength.

The amount of solute dissolved in gram per liter of the solution is used to determine the solution's strength. It stands for the solution's potency or concentration. It uses gram per liter of expression.

Now here we are given the the mass and volume connection so we have to find the percentage in terms of it.

percentage strength=[tex]\frac{mass}{volume} *100[/tex]

percentage strength=[tex]\frac{0.020*100}{2}[/tex]

on solving we get,

percentage strength=1%

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you need 3.00 mL of the 4.00 M sulfuric acid solution to make 12.0 mL of a 0.50 M solution.

Solution is a way to solve a problem or address an issue. It can involve finding an answer or coming up with a strategy to tackle a difficult situation. Solutions can be found through research, brainstorming, trial and error, or by using existing resources.

To solve this problem, we must use the equation:
V1C1 = V2C2
Where V1 is the volume of the concentrated solution, C1 is the concentration of the concentrated solution, V2 is the volume of the dilute solution, and C2 is the concentration of the dilute solution.
In this case, V1 is the volume of the 4.00 M solution that we need, C1 is 4.00 M, V2 is 12.0 mL, and C2 is 0.50 M.
Plugging these values into the equation, we can solve for V1:
V1 = (V2C2) / C1
V1 = (12.0 mL)(0.50 M) / (4.00 M)
V1 = 3.00 mL

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Given data

Mass of the piece of a solid carbon dioxide is m = 6.8 g

Volume of the solid carbon dioxide is V=4L

The temperature is T = 23°C = 296 K . The pressure of the air in the container is

740 Pho = 740 torr = atm 76

The temperature is T = 23 deg * C = 296K

The pressure of the air in the container is

Pho = 740 torr 740 760 atm

(a)The expression of ideal gas equation is given by,

PV = nRT

PV = (m/M) * RT

Where, P is the pressure in which the container after all the carbon dioxide is vaporizes.

M is the molar mass of the solid carbon dioxide (M = 44.01g / m * ol)

R is the universal gas constant R = (0.0832kJ / m * olK)

Substitute the all values in the above equation and calculate the value of pressure in which the container after all the carbon dioxide is vaporizes.

6.8 g 44.01 g/mol P(4L)= P= (0.0832 kJ/mol K) (296 K) (0.1545 mol) (0.0832 kJ/mol K) (296 K)

P = 0.951atm

(4L)Thus, the pressure in which the container after all the carbon dioxide is vaporizes is 0.951 atm.

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Answer:

wavelengths

Explanation:

hope it helps

thanks

Wavelengths are being recorded by the machine by using IR spectrography. Therefore, option B is correct.

Infrared (IR) spectroscopy is also known as infrared spectrometry. It is a technique that is used to analyze and identify chemical compounds based on their absorption or emission of infrared radiation.

Infrared radiation lies in the electromagnetic spectrum between visible light and microwave radiation. It has longer wavelengths and lower frequencies than visible light. When infrared radiation passes through a sample, certain chemical bonds in the sample absorb specific frequencies of infrared light.

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The reactivity of the metals as we go across in the period or  from the left to the right horizontally in the periodic table it will decreases.

The reactivity of the metals as we move across the period from left to right in the periodic table it will decreases. the reactivity of the metals as we move in the group from top to the bottom in the periodic table it will increases due the increase in the size of the elements from top to bottom.

Thus, the reactivity of the metals decreases as we move across period from left to the right in the periodic table.

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The pressure inside the container with 5 moles of gas, 62 liters volume and 222K temperature is 1.46 atm.

Ideal gas law illustrates the relation between pressure, volume and temperature of a gas. It is represented by the equation

PV = nRT

Where P is the pressure, V is the volume, n is the number of moles, R is the gas constant and T is the temperature.

V = 62 liters

n = 5 moles

R = 0.0821  L(atm) mol⁻¹K⁻¹

T = 222K

PV = nRT

P × 62 = 5 × 0.0821 × 222

P = 5 × 0.0821 × 222/62

P = 1.46 atm

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Neutral carbon-14 contains six electrons, six protons, eight neutrons.

- The smallest particle that may exist, an atom, is what creates the entire cosmos. It has a core nucleus that houses the neutral species known as neutrons and positively charged species known as protons.

The orbit of the nucleus is being circled by negatively charged species of electrons. The atomic number of an atom is determined by its protons, and the number of protons is always equal to the number of electrons.

The carbon-14 in this instance is an isotope of carbon-12 with a mass number of 14. Atomic number six carbon has a total of six protons and six electrons.

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MassMass of oxygen used on combustion of 0.554 mol of phosphorus is 957.12 g.

Combustion is the name given to the chemical reaction in which a material combines with oxygen to produce heat. A substance is said to be combustible if it can burn. Another name for it is fuel. Fuel can be either solid, liquid, or gaseous.

Since, 4 moles of phosphorus burns in the presence of 5 moles of oxygen

Therefore, 0.554 moles of phosphorus will burn in presence of 54×0.554=29.91 moles of oxygen.

Molar mass of oxygen is 32 g/mol.

Hence, mass of oxygen used can be calculated by:

Mass of oxygen used under given reaction conditions =32×29.91⇒957.12 g.

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Mass of oxygen used on combustion of 0.554 mol of phosphorus is 957.12 g. Oxygen has an atomic mass of 15.9994. ss.

Combustion is the name given to the chemical reaction in which a material combines with oxygen to produce heat. Another name for it is fuel. Fuel can be either solid, liquid, or gaseous.

4 moles of phosphorus burns in the presence of 5 moles of oxygen 0.554 moles of phosphorus will burn in presence of 54×0.554=29.91 moles of oxygen. Molar mass of oxygen is 32 g/mol. Mass of oxygen used under given reaction conditions 32×29.9 = 957.12 g.

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Inside the metric system, length as well as distance were two of the most significant metrics. Measurement of length and distance can be done in a variety of ways.

Using a metre stick is among the most popular methods for gauging these amounts.

A meterstick, meterstick, nor yardstick consists of either a straightedge as well as foldable ruler was using to measure length, and therefore is notably common inside the construction business. They frequently consist of wood as well as plastic, and their joints frequently consist of plastic as well as metal to allow for folding.

A metre stick is a highly helpful tool in science that is exactly one metre long. A metre stick can be used to gauge items and distances that are both less than as well as longer than one metre.

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Answer:

Molecule name: N--N-METHYL-N-PROP-2-YNYLAMINE

Formula: C13 H15 N

Molecular weight: 185.265 Da

RMA-3 (Rubidium Microporous Aluminosilicate-3) was hydrothermally synthesized from rubidium–aluminosilicate gels without using any organic or inorganic additives, and its structure determined by XRD Rietveld analysis was confirmed as a novel framework topology containing two 8-membered ring pore-openings with dimensions of 0.49 × 0.37 nm and 0.34 × 0.38 nm

Answer:

Hey there! Just wanted to let you know that the term RMA stands for "relative molecular mass" in chemistry. This is a measure of the size of a molecule, calculated by adding up the atomic weights of all the atoms in the molecule. For example, the relative molecular mass of water (H2O) is 18, because the atomic weight of hydrogen (H) is 1 and the atomic weight of oxygen (O) is 16. The relative molecular mass of a molecule is typically expressed in atomic mass units (amu) and can be useful for characterizing and comparing different substances, and predicting their physical and chemical properties.

Using the law of the conservation of mass, the reactions can be shown to obey the law.

We need to know what the law of the conservation of mass says so that we can be able to know how we can be able to apply the law in the proper perspective. We have to know that the law says that total mass of the system would remain constant. The implication of this is that the mass before the reaction would be the same as the mass after the reaction. The mass of the substance must be able to add up in the system that is under study as we have one here.

Mass of the iron = 56 g

Mass of the chlorine = 35.5 g

Balanced reaction equation;

[tex]2Fe + 3Cl_{2} ---- > 2FeCl_{3}[/tex]

This is the  formation of the iron III chloride

Total mass on the right hand side = 2(56) + 6(35.5) = 325 g

Total mass on the left hand side = 2[56 + 3(35.5)] = 325 g

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