b. how would you prepare 225.0 mL of 1.33 M HCL FROM A 6.00 M stock solution?

c. what volume of 0.2500 M strontium hydroxide is required to completely react with 75.00 mL of 0.07942 M HCl?

Answer:

hydrogen, nitrogen, oxygen, fluorine, and chlorine

Explanation:

hydrogen (H, element 1), nitrogen (N, element 7), oxygen (O, element 8), fluorine (F, element 9), and chlorine (Cl, element 17) are all gases at room temperature, and are found as diatomic molecules (H2, N2, O2, F2, Cl2).

A balanced equation representing the acid-base reaction that allows the calculation of the moles of aspirin in a sample is

[tex]C_{9} H_{8}O_{4} + NaOH[/tex]⇒ [tex]C_{9} H_{7}O_{4} Na+ H_{2} O[/tex]

Aspirin, also known as acetylsalicylic acid, is a nonsteroidal anti-inflammatory drug used to reduce pain, fever, and/or inflammation, and as an antithrombotic.

Aspirin is a benzoic acid with an ortho-substituted acylated alcohol function (actually a phenol). Therefore, two reactions can occur when aspirin and NaOH are combined: In fact, several aspirin formulations contain this ingredient.

Hence, A balanced equation representing the acid-base reaction that allows the calculation of the moles of aspirin in a sample is

[tex]C_{9} H_{8}O_{4} + NaOH[/tex]⇒ [tex]C_{9} H_{7}O_{4} Na+ H_{2} O[/tex]

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Yes. The pH of 3.7 should be the equivalency point.

Methyl orange transforms from a basic to an acidic color during a strong acid weak base titration, making it a useful chemical indicator. In acidic and basic media, respectively, methyl orange exhibits red and yellow colors. In titration, the solution appears yellow at first because the pH is high.

Methyl orange is a frequently used pH indicator in titrations because of its easy-to-see color shift. Because it changes color at a weak acid's pH, it is frequently employed in acid titrations. Methyl orange turns red in an acidic medium while turning yellow in a basic one.

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After  2.18 years   this radioactive outcomes occur.

For a first order reaction, we have the equation: [Co] = [Co]0 * 2-t/t1/2, where [Co]0 is the inital concentration of Co, [Co] is concentration at time t and t1/2 is half life

We are given [Co] = 75 % of [Co]0 = 75/100 * [Co]0

Pluggin this into the above equation:

75/100 * [Co]0 = [Co]0 * 2-t/5.26

Solving, t = 2.18 years

The capacity of some substances to spontaneously emit energy and subatomic particles is known as radioactivity. It is, in essence, a property of certain atomic nuclei. An unstable nucleus will spontaneously decay, or transform into a more stable structure, however this only occurs in a limited number of specific ways by ejecting certain particles or types of electromagnetic radiation. Radioactive decay is a property that many naturally occurring elements and their manufactured isotopes have.

The rate of radioactive element decay is measured by the half-life of an element, which is the period of time it takes for one-half of any given quantity of the isotope to decay. Half-lives for certain nuclei might range from greater than 1024 years to less than 1023 seconds.

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The upper left corner is 87 Rb (option-b).

To determine the age of old rocks, scientists use the radioactive isotope rubidium-87. Its 49 billion-year half-life is very long. In high-accuracy timing devices like GPS receivers, it serves as a frequency standard as well. Bose-Einstein condensates and laser cooling are two additional uses for it.

The strontium (87Sr/86Sr) isotope ratio is a significant and potent investigative tool that has been used extensively and successfully in petrogenesis (e.g., Nakai et al., 1993; Subas et al., 2015; Kozlik et al., 2016), mineral weathering, and acidity in soils (e.g., Graustein and Armstrong, 1983; Bullen et al., 2016).

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While NADPH is necessary for the synthesis of several organic compounds, ribose 5 phosphate is required for the synthesis of nucleic acid. The whole oxidation of glucose happens in the cytosol via the pentose phosphate route, which generates NADPH and CO2 but not ATP.

Are biosynthetic reactions dependent on ribose-5-P?

If ribose-5-P is not required for biosynthetic processes but NADPH is.

What results from the reaction of ribulose with glucose-6-phosphate?

In this process, a single molecule of glucose-6-phosphate breaks down into two molecules of NADPH and one molecule of ribulose-5-phosphate in the presence of a water molecule and NADP+.

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Ribulose 5-phosphate - 2 NADPH + 2 H+ + CO Glucose 6-phosphate - 2 NADP+ + H2O is the overall result for this process.

Here are the eight responses: NADPH is produced via the following reactions: reaction 1 transforms sugar 6-phosphate into D-glucono-1,5-lactone 6-phosphate; reaction 2 creates 6-phospho-D-gluconate; reaction 3 creates ribulose 5-phosphate; and reaction 4.

The five-carbon sugar ribose is referred to as pentose, while nicotinamide adenine phosphate, or NADPH, is referred to as phosphate in the name of the pentose phosphate pathway.

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Base pair of DNA. The chlorine bases adenine (A), thymine (T), and cytosine (C), as well as guanine (G), couple together under normal conditions.

The waste products left over after protein metabolism are nitrogenous wastes. Urine is the primary way that nitrogen wastes are expelled combined with water. These wastes include ammonia, urea, uric acid, etc.

Amides, amides, amines, imines, esters, objec­tive, azo compounds, cyanates, imide, nitrates, ammonium nitrate, nitrogen compounds, and so on are examples of organic nitrogen. One of the primary constituent elements of amino acids, proteins, nucleic acids, and nitrogenous bases.

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The numbers of protons, electrons, and neutrons in four atoms. Atom 1 has charge of -1.

Atom                            1    2   3   4

Number of protons   9     9    9    19

Number of neutrons 8     19  19    10

Number of electrons 9     8   19    19

An atom is a particle of remember that uniquely defines a chemical element. An atom consists of a important nucleus this is surrounded by using one or extra negatively charged electrons. The nucleus is definitely charged and carries one or extra exceedingly heavy particles known as protons and neutrons.

An atom is any particle of count number at its most simple level which contains at the least one proton. here are a few examples of the atoms: hydrogen (H) and neon (Ne). However in terms of the phrase atom, we ought to go to historic Greece of four hundred B.C. And there has been a first rate truth seeker named Democritus, and he proposed the Greek word atomos, which means that uncuttable. And so as he defined, all count become ultimately reducible to discrete, small debris or atomos.

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Answer:

b) electrons are shared in a covalent bond

Explanation:

remember for ionic bonding, it occurs between a metal and a non-metal, we know that the metal donates electrons to the non-metal while the non-metal is the receiver.

the reason why the metal donates electron is usually because it has between 1-3 electrons on its valence shell and therefore there is a weaker attraction of the positive nucleus to the outermost electrons hence why it is readily donated.

the opposite occurs for the non-metals hence why it readily accepts electrons to become stable

While ions in a covalent bond are shared evenly by the atoms, an ionic bond guidance and suggestions an electrons to the other atom involved in the bond.

When two atoms exchange an electron pair, they form an interatomic connection known as a covalent bond in chemistry. The electrical interaction of their protons for the identical electrons is what causes the binding.

A covalent bond is formed when two atoms exchange one or even more pairs of electrons. The two two atoms are concurrently drawing these electrons to them. When the difference in two atoms' electronegativities is too low for an electron transfer to happen, a covalent bond is created.

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The coefficient 2 should be placed in front of H2O to balance the following reaction: 2H2 +O2 = 2H2O.

The equation is said to be balanced when each element has the same number of atoms on both sides of the equation. The use of coefficients allows for the balancing of chemical equations. To complete the number of atoms, an element is given a coefficient, which is a numerical value.

This is the answer: 2H2 + O2 Equals H2O.

To equalise the proportion of hydrogen and oxygen atoms, we utilise coefficient 2. Coefficient 2 should be placed in front of H2O to balance the following reaction: 2H2 +O2 = 2H2O.

A coefficient is an integer that is either multiplied by or listed next to the variable with which it is linked. In other terms, a coefficient is a term's numerical factor that contains both constants and variables. The coefficient in the phrase 2x, for instance, is 2.

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Density is an intensive property as it does not depend on the quantity of the substances Whereas mass and volume are extensive property. The total volume of ring is 0.31ml.

Density tells about the compactness of the substances, how much dense is the substances in other words. Object that is more denser than water they just sink in the water

Mathematically,

Density = Mass  ÷volume marked on the graduated cylinder

Density of gold =19.3 g/mL.

Mass of  gold=5.26 g

Volume of gold= 5.26 g ÷ 19.3 g/mL.=0.27ml

Density of diamonds= 3.51 g/mL

Mass of  diamonds=0.170 grams

Volume of diamonds= 0.170 g ÷ 3.51 g/mL.=0.27ml=0.04ml

Total volume =0.27ml+0.04ml=0.31ml

Therefore, the total volume of ring is 0.31ml.

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The amount of light that reaches the detector can be reduced by scuffs and fingerprints on the surface of the cell. Your results won't be correct if this happens.

To measure the concentration of a particular solution precisely, this equipment requires cautious usage. If certain preparatory processes weren't followed, the wavelength could be off.

Always use a lint-free cloth to clean or manipulate the cuvette, and be careful to wipe out any water that may have accidentally dropped inside.

Although each fingerprint is unique, they all fall into one of three main categories: the whorl, which resembles a spiral, the loop, which resembles a teardrop, and the arch, which resembles a cross-section of a hill.

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Gases in ascending order of density at NH3, N2, Ar, and N2O4. When the temperature of a gas rises, its density rises as well..

By examining the four major gases you're monitoring for—oxygen (O2), carbon monoxide (CO), hydrogen sulfide (H2S), and methane (CH4)—a 4 gas monitor can help you protect your employees in any setting.

When there is more water vapor than the air can hold, clouds form. The water is what gives the cloud its visual appearance once the water vapour (gas) condenses to create minute water droplets (liquid). Due to their tiny size, these droplets float in the air.

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The best describes the type of cellular transport that the student is investigating would be passive transport of osmosis.

Passive transport is transport that does not require energy. This transport occurs due to differences in concentration between substances or solutions that move from high concentrations to low concentrations. There are three types of passive transport namely diffusion, assisted diffusion and osmosis.

Basically, osmosis includes diffusion events. However, in osmosis, what moves through a semipermeable membrane is water from a hypotonic solution (high water concentration, low solute concentration) to a hypertonic solution (low water concentration, high solute concentration). For example, potatoes that are soaked in concentrated sugar water for several hours will experience weight loss. This is because the water in the potato cells moves into the sugar solution.

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Answer:

2NaCl + F₂ → 2NaF +Cl₂

A molecular formula is a chemical formula for a molecular compound that shows the types and numbers of atoms in the compound's molecule. Ammonia is a nitrogen-hydrogen compound.

The total number of shared electrons in a molecule is 22.

Ionic and covalent compounds are the two types of compounds. Molecules are the most basic unit of a covalent compound, and they can be represented in a variety of ways.

Atoms are the smallest units of matter that retain an element's fundamental chemical properties. However, much of the study of chemistry is concerned with what happens when atoms combine to form compounds. A compound is a unique collection of atoms held together by chemical bonds.

The electrostatic attraction between the positively charged nucleus and the negatively charged electrons surrounding it holds the structure of the atom together, and the stability within chemical bonds is also due to electrostatic attractions. Consider the two most common types of chemical bonds: covalent bonds and ionic bonds. Two atoms share pairs of electrons in covalent bonds, whereas electrons are fully transferred between two atoms in ionic bonds.

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The specific heat capacity is the amount of heat required or absorbed to raise the temperature of a given substance by 1°C.

Usually denoted by a capital C, often with a subscription) is a measurable quantity that describes the amount of heat required to raise the temperature of a substance (object) by a certain amount (eg 1°C).

When calculating the amount of heat, what we calculate is the amount of heat transfer. Heat is an energy that moves from objects with a higher temperature to objects with a lower temperature.

The heat capacity formula is as follows,

C = Q : ∆T

C : Heat capacity (joules/°C).

Q : Heat (joules).

∆T : Change in temperature (C).

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The process of that causes the sugar to spread throughout the water is called solvation.  

Solvation is the process by which solvent molecules surround and interact with dissolved ions or molecules. It simply refers to the interaction of a solute and a solvent. An important example of solvation is hydration where the solvent is water.

In general, the law of analogy applies to solvation is polar and non-polar nature of solute and solvent:

As sugars are polar solutes, hence they end up dissolved in polar solvents such as water.

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The weight of a metal deposited in electrolysis is related to its equivalent mass and current. The atomic mass of the metal is calculated as 31.45 g.

Electrolysis is the process of conversion of electrical energy into chemical energy by passing electrical current through an electrolyte accompanied by the reduction and deposition of a metal.

The weight w of metal deposited in cathode is related to the current I and the time t and the atomic mass a as follows:

w = a It /96500

Where 96500 C is called 1 faraday the charge required to deposit one mole of the metal.

Given w = 0.222 = a × 0.45 A ×  25  ×  60 s/ 96500

a = ( 0.22  × 96500)  / (0.45  × 25 × 60)

  = 31.45 g

Hence, the atomic weight of the metal is 31.45 g.

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The molecule that contains aldehyde group is : CH₃CHO.

An aldehyde is the organic compound containing CHO group at the end. In IUPAC naming the suffix used for the aldehyde group is al.

1) CH₃COCH₃ : This contain c double bond o group that is ketone group.

2) CH₃OCH₃ : The compound compound contain ether group.

3) CH₃CH₂OH : This compound contains the OH group called as alcohol group . the suffix used in alcohol is ol.

4) CH₃CHO : the compound contains CHO group at the end of the chain . this molecule contain aldehyde group.

Thus, The molecule that contains aldehyde group is : CH₃CHO.

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The procedures which would best measure a physical property of unknown sample include the following:

1. Place the sample in a resealable, zip-top bag.

2. Firmly close the zip-top bag.

3. Lightly tap the sample with a hammer.

4. Observe if the sample dents, breaks, or shatters.

5. Record your observations.

In Science, a physical property can be defined as the properties of an object that can be measured and observed without changing or altering the chemical composition of the object.  

In Chemistry, there are two (2) main types of physical property and these include the following:

In conclusion, the aforementioned physical properties such as placing the unknown sample in a zip-top bag that is resealable and firmly close the zip-top bag.

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Complete Question:

A student wants to conduct an investigation that will determine a physical property of an unknown substance. Which of these procedures would best measure a physical property of the unknown sample?

answer choices

1. Create an acidic solution by adding 5 mL vinegar to 100 mL water

2. Place the sample into the acidic solution

3. Observe if the sample begins to fizz in the solution

4. Record your observations

1. Place the sample in a resealable, zip-top bag

2. Firmly close the zip-top bag

3. Lightly tap the sample with a hammer

4. Observe if the sample dents, breaks, or shatters

5. Record your observations

1. Using tongs, hold the sample over a flame

2. Observe if the sample catches on fire

3. Record your observations

1. Break the sample into a fine powder

2. Add the powder to a 500 mL beaker

3. Add 300 mL of water to the beaker and use to stirring rod to mix

4. Using a dropper, add 4 drops of universal pH indicator to the solution

5.Observe any color change in the sample6. Record your observations

Answer:

Molar Mass of CO2 = 12 + (16*2) = 44g/mol

8.80g CO2 x (1mol/44g) = 0.20mol

Explanation:

One liter of this solution could be converted into a buffer by the addition of 0.25 mol of NH3 and 0.13 mol of KOH.

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False,  Amplitude is not the term used to describe the width of a wave.

Amplitude of a wave basically refers to the maximum amount of displacement of a particle on a medium from the position of its rest.

So we can say thar amplitude is nothing but the distance from the rest position to its crest of the wave. Amplitude can also be calculated from the trough position of the graph.

whereas the width of a wave is nothing but the distance between the highest surface part of the wave called crest to the lowest surface part of the wave called trough. So distance between a crest and a trough is actually the width of a wave.

So amplitude is not used to determine the width of the wave

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Change in enthalpy of the system is directly proportional to the change in internal energy.

What is enthalpy?

A thermodynamic system's enthalpy, which is one of its properties, is calculated by adding the system's internal energy to the product of its pressure and volume. It is a state function that is frequently used to monitor chemical, biological, and physical systems at a constant pressure that is conveniently given by the sizable surrounding environment. The energy necessary to determine the system's physical dimensions, or to make room for it by displacing its surrounds, is expressed by the pressure-volume phrase. Under typical conditions, the pressure-volume term is very small for solids and liquids and moderately small for gases.

Hence change in enthalpy of the system is directly proportional to the change in internal energy..

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44.8 g  is the mass of the copper piece

density= 8.96 g/cm3.

volume=5.00 cm3

density=mass/volume

mass=density × volume

mass= 8.96 g/cm3× 5.00 cm3

mass=44.8 g

The amount of matter that makes up an item is quantified by its mass. The kilogram (kg) is the fundamental unit of mass in the SI, and its initial definition was the mass of one liter of water at room temperature (the volume of a liquid changes slightly with temperature). The only SI base unit with a prefix is the kilogram.

Weight and mass are often used interchangeably. On the moon, the gravitational pull is roughly one-sixth as strong as it is on Earth. The weight of a given object will thus be six times greater on Earth than on the moon. Since mass only depends on the amount of matter in an object, it is location-independent.

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The repulsion of the electron pair surrounding the core atom has a significant impact on the geometry or shape of the electron.

The tendency of the electron pairs in an atom to repel one another when they are present is known as electron pair repulsion.

The more repulsion there is between the electron pairs, the more the electrons want to organize themselves to lessen it.

Here, the issue of how electron pair repulsion affects molecule geometry is raised.

The fundamental explanation is that the molecule will change its structure to keep the repelling electron pair apart.

The electron pair repulsion also plays a significant role in determining molecular geometry, since molecules prefer to modify their form and geometry in response to the electron pair.

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