What is the percent yield of a reaction in which 43.9 g of tungsten(vi) oxide (wo3) reacts with excess hydrogen gas to produce metallic tungsten and 9.60 ml of water (d= 1.00 g/ml)?

Answer: A compound contains atoms of different elements chemically combined together in a fixed ratio. An element is a pure chemical substance made of same type of atom. Compounds contain different elements in a fixed ratio arranged in a defined manner through chemical bonds. They contain only one type of molecule.

Explanation:

Polyprotic Acid : Acids that can mislay, and bases that can gather up, more than one H+ (e.g. diprotic H2A and triprotic H3A acids).

Ionization take place stepwise, and each and every step has its own Ka.

H3PO4 (aq) ⇌ H+ (aq) + H2PO4 - (aq) Ka1 = 7.2 x 10-3

H2PO4 - (aq) ⇌ H+ (aq) + HPO4 2- (aq) Ka2 = 6.3 x 10-8

HPO4 2- (aq) ⇌ H+ (aq) + PO4 3- (aq) Ka3 = 4.2 x 10-13

According to question

To decide the fractional concentrations of one and all species at assorted pH values, first write the Henderson-Hasselbalch equation for each and every dissociation reaction.

Formula of Henderson-Hasselbalch equation is :

pH = pKa + log10 ([A–]/[HA])

pH = pK1+log[H2PO^4-] / [H3PO4]

pH=pK2+log[ HPO^2-] / [H2PO^4-]

pH = pK3+log[PO^3- 4] / [HPO^2- 4]

a. Fraction of H3PO4: pH0 = 0.993; pH2 = 0.58; pH4 = 0.01 ; pH 6 is negligible.

b. Fraction of HPO4 ^2- : pH 0 is negligible and 0.06; pH8 = 0.86; pH10 = 1.0; pH12 = 0.72

c. Fraction of PO3 ^2- : negligible at any pH < 10 ; pH 12 = 0.28

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The anaerobic process of splitting glucose and forming two molecules of pyruvic acid is called 'glycolysis.'

The word glycolysis means 'glucose splitting' and this is what happens throughout the process.

During glycolysis, enzymes are used to split one molecule of glucose into two molecules of pyruvate (pyruvic acid).

This process produces end products which include two molecules of ATP and two molecules of NADPH as well as water.

As this is an 'anaerobic process' which means it doesn't need oxygen for the process.

The process of glycolysis also takes place inside the cytoplasm and occurs in both aerobic and non-aerobic organisms.

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The correct answer is option a) A hypothesis is tested repeatedly and the results are confirmed and debated by the scientific community.

Scientific knowledge is the knowledge that has been acquired and tested using the scientific method. Scientific knowledge may also comprise the observation and classification of facts to establish verifiable knowledge gained through induction and hypothesis.

A hypothesis is a proposed explanation for an event that can be tested. Hypotheses, or tentative explanations, are typically generated within the context of a scientific theory. A widely accepted, rigorously investigated and verified explanation for a collection of observations or a phenomenon is what is known as a scientific theory. The basis of all scientific knowledge is a scientific theory.

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Scientific knowledge results from the interaction of scientists who are investigating natural phenomena. Which of these ​BEST describes how a scientific explanation becomes widely accepted?

a) A hypothesis is tested repeatedly and the results are confirmed and debated by the scientific community.

b) It is debated by the scientific community.

c) A hypothesis is tested repeatedly and the results of the tests are debated.

d) A hypothesis is tested repeatedly and the results are mostly supported by scientific investigations.

Triplet multiplicity would expect in a 1h NMR spectrum for the indicated proton(s).

The spectrum is the invisible radio frequencies that radio signals pass through. These signals let you make phone calls from your mobile device, tag your friends on  call an Uber, and get directions to your destination, all from your mobile device.

Spectrum management is the art and science of managing the use of the radio spectrum to minimize interference and ensure that the radio spectrum is used in the most efficient manner possible for the public good. For USDOT, this focuses on supporting safe, efficient, and economical transportation. Spectrum Networks is a suite of news and sports networks owned and operated by Charter Communications, Inc.

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The features are shared by all three-carbon monosaccharides, They are all pentoses. In their linear forms, they all contain carbon carboxyl and several hydroxyl functional groups. In their linear forms, they all contain a carbonyl and several hydroxyl functional groups.

Carbon is used in some form in almost every industry in the world. It is used as fuel in the form of coal, methane gas, and crude oil (used to make gasoline). It is used to make all sorts of materials, including plastics and alloys such as steel (a combination of carbon and iron).

Life on Earth cannot exist without carbon. This allows carbon to readily form bonds with other atoms, giving it flexibility in the forms and functions that biomolecules such as DNA and RNA can adopt, and is essential for growth and replication, the defining properties of life. This is partly due to

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Zn, Cd, and Ag are transition metals that usually form only one monoatomic cation.

A monatomic cation is a cation made of only one atom.

Cations are positively charged ions, in this example Ag⁺, Cd²⁺ and Zn²⁺.

These cations form only one type of ion, while iron and copper form more than one type of cations.

Iron and copper form cations with different charges (Fe²⁺, Fe³⁺, Cu⁺, Cu²⁺).

It depends on electron configuration which type would be formed.

Electron configuration of zinc atom: ₃₀Zn 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s²

Transition metals are elements in the d-block of the Periodic table.

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The pH of the diluted solution is 5.53.

Henderson–Hasselbalch equation for buffer solution:

pH = pKa + log(c(CH₃COO⁻)/c(CH₃COOH))

pH = 5.0 ⇒ c(H⁺) = 10⁻⁵ M

pKa = 4.75 ⇒ Ka = 1.78×10⁻⁵

log(cs/ck) =  5.0 - 4.75 = 0.25

c(CH₃COO⁻)/c(CH₃COO⁻) = 10∧(0.25) = 1.778

c(CH₃COO⁻) + c(CH₃COOH) = 0.1 mM

c(CH₃COO⁻) + c(CH₃COOH) = 1 × 10⁻⁴M

c(CH₃COOH) = 3.6x10⁻⁵ M; concentration of acetic acid before dilution

c(CH₃COOH) = 3.6x10⁻⁶ M; concentration of acetic acid after 10 times dilution

c(CH₃COO⁻) = 6.4x10⁻⁵ M; concentration of sodium acetate before dilution

c(CH₃COO⁻) = 6.4x10⁻⁶ M; concentration of sodium acetate after dilution

c(H⁺) = 10⁻⁶ M; concentration of hydrogen ions

After buffer solution is diluted to 1 l:

Ka = (c(CH₃COO⁻) + x) × (c(H⁺) + x) / (c(CH₃COOH) - x)

1.78×10⁻⁵ = (6.4x10⁻⁶ M + x) × (10⁻⁶ M + x) / (3.6x10⁻⁶ M - x)

x = 2.12×10⁻⁶ M

c(H⁺) = 10⁻⁶ M + 2.12×10⁻⁶ M

c(H⁺) = 3.12×10⁻⁶ M

pH = -logc(H⁺)

pH = -log3.12×10⁻⁶ M

pH = 5.53

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Answer:

a water molecule.  

Explanation:

The two reacting groups are a carboxylixc acid group (-COOH) and an amine (-CNH2).  The forms the peptide link (-C-CO-N-C) and a molecule of water is released (H2O).

The statement oxygen is negative and hydrogen is positive is true.

Charge on an element is determined by the position of an element in the periodic table.More precisely,it is determined by an element's electronic configuration.

Elements having one electron in their outermost or valence shell are  situated to the left of the periodic table and are positive as they  loose their one electron present in valence shell to form cations that are positively charged ions.

Elements having six or seven electrons in their valence shell tend to gain one or two electrons respectively to complete their octet.These elements form anions that are negatively charged ions.

Hydrogen with atomic number 1 has 1 electron in it's valence shell which it looses to acquire a positive charge and hence form a cation .

Oxygen on the other hand,with atomic number 8 has 6 electrons in it's valence shell and thus gains 2 more electrons to complete the octet,and hence gain a negative charge and form an anion.

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Vacuum gage connected to a chamber reads 35 kpa at a location where the atmospheric pressure is 92 kpa then the  absolute pressure in the chamber and express is 57kpa

Gauge pressure is the pressure relative to atmospheric pressure. Gauge pressure is positive for pressures above atmospheric pressure, and negative for pressures and absolute pressure is the sum of gauge pressure and atmospheric pressure

Here to find absolute pressure atmospheric pressure=92kpa and  vacuum gage=35 kpa                                      

Pabsolute pressure=Patmospehric pressure - Pvaccume

92-35=57kpa

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A block has a density of 1.73 g/mL has a density of  1.73 * 10⁶ mg/L.

The density of a substance is the ratio of the mass of a a given volume of a substance and the volume of that substance.

Mathematically, the density of a substance is given by the formula shown below:

Depending on the units in which the mass and volume of the substance is given, the unit of density can be given as follows:

kilogram per cubic meter; kg/m³

gram per cubic centimeter; g/cm³

gram per liter; g/L

milligram per liter; mg/L

The given block  has a density of 1.73 g/mL.

To convert from gram to mg, we multiply by 1000

1.73 g = 1.73 * 1000 = 1730 mg

to convert from mL to L, we divide by 1000

1 mL = 0.001 L

Density of the block in mg/L = 1730 mg/ 0.001 L

Density of the block in mg/L = 1.73 * 10⁶ mg/L

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Answer:

A strong base, such as NaOH. The amount of OH added shouldn't exceed 0.35 mols (though i would stop at 0.30 mols)

Explanation:

a weakly basic salt can be turned into a buffer by the addition of a strong base, and a weakly acidic salt can be turned into a buffer with a strong acid

The form of motion which is described is velocity as it is describing the speed as well as the direction.

Motion is defined as a phenomenon which is described with respect to change in object's position with respect to time.It is given in terms of displacement,velocity,distance ,acceleration,speed.

Branch of physics which deals with motion of objects without any reference to it's cause is called kinematics while the branch which studies forces and their effects on motion is called as dynamics.

Motion applies to various systems like objects,bodies, matter particles ,radiation ,curvature.There are three laws of motion which are proposed by Newton.Classical mechanics is based on Newton's law of motion.Relativistic  mechanics is based on modern kinematics.

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The best site for tritium labeling would not exchange the tritium ions for protons in water. All of the N−H sites (II−IV) would readily exchange tritium protons due to their lone pair-facilitating protonation and subsequent tritium exchange with water, but the C−H site (I), lacking a lone pair, would retain its tritium label.

Water is an inorganic, clear, tasteless, odorless, nearly colorless chemical substance that is the main component of the earth's hydrosphere and the fluid of all known living organisms. Although it provides no food, energy, or organic micronutrients, it is essential to all known forms of life.

There are three atoms in the water molecule. Two hydrogen atoms (H) and one oxygen atom (O). This is why water is sometimes called H2O. One drop of water contains billions of water molecules. Water is wet in the sense that it is a highly mobile liquid. This is because the molecules are fairly loosely bound and thus have low viscosity.

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Answer: a

Explanation:

The appropriate designation for an ion with 24 protons, 27 neutrons, and 21 electrons is [^51 Cr24].

How to represent an atom with atomic number and mass?

The smallest component of ordinary stuff that makes up a chemical element is an atom. Each neutral or ionized atom makes up a solid, liquid, gas, or type of plasma. Atoms are very small, with an average diameter of 100 picometers.

Symbolical representation is :

            [ Xz^A] or  [^A Xz]

Where,

A = Mass , X = atom, Z = Atomic number.

The quantity of protons and neutrons in an atom's nucleus is referred to as its mass number.

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The two main constituents of the sun, are both lightweight elements.

Helium and hydrogen make up the majority of the sun's mass (He). The sun is made up of 92.1% hydrogen and 7.9% helium by mass. Less than 0.1 percent of the mass of the sun is made up of different metals. The surface of the sun is around 10,340 degrees Fahrenheit hot (5,726 degrees Celsius).

The majority of the sun's emissions come from particles like neutrinos that travel beyond the light the sun's surface emits and can't be seen with ordinary spectroscopic instruments. As a result, to identify these particles, specialised equipment were needed, such as the Super Kamiokande (Kamioka Observatory, Japan), which has incredibly sensitive light sensors. These particles provided evidence that nuclear fusion processes were taking place in the Sun's core, which is what caused their emission.

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Use only sterile water, as was previously indicated. Water is made bacteriostatic by adding benzyl alcohol. You can immediately decide which is suitable based on allergies.

If you are allergic to benzyl alcohol, avoid using or drinking bacteriostatic water altogether and opt for sterile water.

Another distinction is with indications. The FDA regulates the purposes for which drugs are used or what is disclosed on their labels. While sterile water is designated for both irrigation and injection, bacteriostatic water is only intended for injections.

The difference of several uses, as has previously been established, is crucial. Due to the absence of a bacteriostat, sterile water can only be utilized once.

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The atomic number of an isotope of tellurium that has 71 neutrons is 52.

The atomic number of an element is the number of protons in an atom of that element.

The number of protons in an atom can be got by subtracting the mass number of an element from the number of neutrons.

According to this question, one isotope of tellurium, tellurium-123, has 71 neutrons. The atomic number or proton number can be calculated thus;

atomic number = 123 - 71

atomic number = 52

Therefore, the atomic number of an isotope of tellurium that has 71 neutrons is 52.

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Answer:

Explanation:l do not no the answer

A chemist experiments on a molecule with the formula of c5h10o5. this compound is likely a(n)  carbohydrates.

A molecule with the formula C₅H₁₀O₅  is carbohydrates.

What are Carbohydrates?

therefore the molecular method C₅H₁₀O₅ represents carbohydrates.

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We emphasize the valence electrons in an atom when discussing atomic properties, as they are most accessible to other atoms.

The valence electrons are the electrons that are present in the outer shell of the atoms. These electrons are free for making bonds with the electrons of other atoms.

Electrons are joined with other electrons to make a compound. These electrons are shared by or gained by other atoms.

Thus, when discussing atomic qualities, we focus on the valence electrons in an atom since they are the most receptive to other atoms.

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answer:

d. the study of heat flow.

explanation:

thermodynamics is the study of the relations between heat, work, temperature, and energy.

Chlorhexidine and alexidine are: used in mouthrinses and are effective against plaque formation.

Chlorhexidine is a disinfectant and antiseptic. It is used for preventing dental plaque, treating yeast infections of the mouth and cleaning wounds.

Chlorhexidine interacts with components of toothpaste and forms salts of low solubility and antibacterial activity.

Alexidine is an antimicrobial agent, used in mouth washes as antiplaque cleaner. It is better for use than chlorhexidine because it is relatively non-toxic

Chlorhexidine and alexidine were synthesized in 1950s.

They inhibit a dental plaque formation by 70%.

Dental plaque is a biofilm of microorganisms that grows in the mouth.

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Answer: 27.69 mL^3

Explanation:

32.5 g * 0.852 g/mL=

32.5*0.852=27.69 mL^3       ==>Volume is expressed in units cubed.

If 25.0 ml is taken from a stock solution and added to volumetric flask and diluted up to the calibration mark, then the new concentration will be 1.49 g/L.

Now, Concentration of solution is defined as amount of solute present in specific volume of the solution.

Molarity (M) = moles of solute ÷ litres of solution

Here, the concentration of solution is given as, 14.9 g/l

and, the volume of solution is 25.0 ml= 0.025 l

using the equation,

   14.9 = moles of solute ÷0.025

   moles of solute = 0.3725 moles

0.025 l is added to a 0.25 l (250.0 ml =0.25 l) volumetric flask and diluted up to the calibration mark.

Since,

volume of solution = volume of flask

And, moles of solute remains the same.

Therefore,

The new concentration is,

concentration = (0.3725 ÷ 0.25) g/l

New concentration = 1.49 g/l

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Explanation:

brass copper mixed with zinc

A dmixture of sugar and gari

A mixture of beans and rice