When preparing a buret for use in lab, the buret must always be cleaned thoroughly. Prior to being filled with solution, the buret is rinsed one last time. What is the buret rinsed with, and why?.

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:

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

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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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 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 skateboarder will have the most kinetic energy at point X and Y.

The energy an object possesses as a result of its motion is known as kinetic energy. With a decrease in object speed, the kinetic energy drops.

K.E = ¹/₂mv²

The skateboard will be moving at its fastest at points X and Y in the following diagram. Speed and kinetic energy are inversely correlated.

The skateboarder will therefore have the greatest kinetic energy at points X and Y, we can deduce.

The energy an object has as a result of motion is known as kinetic energy. A force must be applied to an object in order to accelerate it. We must put in effort in order to apply a force. After the work is finished, energy is transferred to the item, which then moves at a new, constant speed.

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Answer:

X and Y

Explanation:

Edge said so

When current is applied, flow charges begin to flow, converting electrical potential energy into kinetic energy that aids in the movement of the fan. The fan's rotation is aided by the conversion of the kinetic energy into another form once more.

However, as soon as you exert force on the battery, the charged particles begin to exert their energy, transforming the potential energy into kinetic energy. Similar to this, when you turn on a light, the potential energy moves through your wiring and is transformed into heat and light, both of which are examples of kinetic energy.

The vehicle's motor converts the electric potential energy into the electric current it needs to produce kinetic energy. Kinetic energy is the energy of motion, and the rotation of a rotor in a motor is the source of kinetic energy. The wheels may turn because of the rotor's spinning transfer of energy.

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the mass of one atom will be [tex]m'=1.054 * 10^{-22}[/tex] g

Due to their greater conductivity than aluminum materials, copper materials are used in electronic equipment. Copper replaces aluminum in silicon chips for connectivity and leads frames in integrated circuits and printed circuit boards.

The given sample of copper has a mass of 63.5 g

The number of atoms of copper in the sample is=[tex]6. 02 * 10^{23 } atoms[/tex]

It is given that n=[tex]6. 02 * 10^{23 } atoms[/tex] number of copper atoms has a mass of 63.5 g.

So, the mass of 1 copper atom will be,

[tex]m'=\frac{m}{n}[/tex]

[tex]m'= \frac{63.5}{6.022 * 10^{23} }[/tex]

[tex]m'= 10.54 * 10^{-23}[/tex]g

[tex]m'=1.054 * 10^{-22}[/tex] g

Therefore, the mass of one atom will be [tex]m'=1.054 * 10^{-22}[/tex] g

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Subatomic particles can usually pass un deflected through an atom because the volume of an atom is composed of largely empty space.

The subatomic particle are the particles that are inside an atom.  the subatomic particles are : protons , neutrons and the electrons. the protons and the neutrons both together form the nucleus of atom and are called nucleons. protons are the positively charged. for an neutral atom number of proton is equal to the number of proton. the electrons are the subatomic particle that revolves around the nucleus.

Thus, Subatomic particles can usually pass un deflected through an atom because the volume of an atom is composed of largely empty space.

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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 temperature of the sample, in kelvin, is 0.45 K.

An ideal gas is a theoretical gas composed of many randomly transferring factor particles that aren't difficult to interparticle interactions. the best gasoline idea is beneficial because it obeys the precise gas law, a simplified equation of country, and is amenable to evaluation under statistical mechanics.

An ideal gas is described as one for which both the extent of molecules and forces between the molecules are so small that they have got no effect at the behavior of the gas. The real gas that acts almost like a really perfect gasoline is helium. that is due to the fact helium, in contrast to maximum gases, exists as an unmarried atom, which makes the van der Waals dispersion forces as low as viable

Using the ideal gas equation:-

Given;

P = 0.123 atm

V = 32.6 L

mass =4.26 g

mole = mass/molar mass

         = 4.26/4

         = 1.07 mole

PV = nRT

T = PV/nR

   = 0.123 × 32.6 /1.07 × 8.314

   =  0.45 K

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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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We can infer from the periodic table of the elements that elements belonging to the same groups have comparable chemical characteristics. An element's chemical characteristics are given by its electron density.

The number of electrons in the valence shell of an atom determines an element's physical and chemical properties according to modern periodic theory. The amount of electrons in an atom's valence shell determines an element's physical and chemical characteristics, in accordance with modern periodic theory. The number of valence electrons shared by all the elements in a group is one. It follows that elements belonging to the same groupings have chemical characteristics that are similar. A substance's quality that can be seen is known as its chemical property.

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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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Breathing apparatus filters out harmful particles, vapors, or gases by using filters attached to the masks being used is Air purifying respirator.

An air purifying respirator removes the gases, gases vapors, combination of contaminants from the air. There are two types of respirator first which removes the dust and harmful substances and the other is which removes the vapors and gases. there are many benefits of using the air purifier. like related to our lungs , asthma. by filtering out fine particles

Thus, Breathing apparatus filters out harmful particles, vapors, or gases by using filters attached to the masks being used is Air purifying respirator.

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There are two bonding electrons when two oxygen atoms are double-bonded to each other.

Due to the fact that each oxygen only receives one electron from its nearby hydrogen, oxygen still has an oxidation number of -1. There is no partial charge produced by the link between two identical oxygen atoms since the electrons were also shared equally.

Oxygen has 6 valance electrons. It will share 2 electron to complete its octet and form double bond .

Hence, in calculation of oxidation number of O2 molecule bonding electrons will be 2

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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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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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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 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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The statements that false is a. The halogens tend to form 1⁺ ions

The reason of that is:

a. The halogens tend to form 1+ ions: it is not correct, since halogens form 1- ions, they form anions, since they are nonmetals. Halogens tend to form anions with a charge of -1 because  Halogens have 7 electrons in their valence shell, so they tend to gain 1 electron to fill their octet.

b. An anion is usually larger than its corresponding atom. it's correct because when the atom has more electrons, and it is an anion, it increases its size more.

c. metals tend to form cations. It's correct, because metals tend to yield their electrons by charging positively and therefore, form cations.

d. Atoms are usually larger than their corresponding cation: it is correct since cations are the ions that have lost electrons, thus decreasing their size.

e. Nonmetals tend to gain electrons. it is correct since nonmetals tend to accept electrons and form anions.

So, The statements that false is a. The halogens tend to form 1+ 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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The information you need to know about the ideal gas constant and H₂O₂ solutions comes from stoichiometric experiments.

The ideal gas constant R can be found experimentally by determining the number of moles of gas occupied by a given measurement volume at a known pressure and temperature, and H2O2 is a compound. It is used in a variety of chemical reactions, is slightly more viscous than water, and in experiments can decompose hydrogen peroxide and use the ideal gas law rearrangement equation to calculate the value of r. To make a decision, we need information such as the concentration, volume, and molarity of H2O2. Its stoichiometry

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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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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 mass of nitrate ions one consume when drank 6 fluid ounces of water that contain 45 ppm of nitrate is 8.2 mg.

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Answer:                                                                                                                          

Explanation: