note the number of atoms of carbon in pyruvic acid and explain why three molecules of carbon dioxide are produced.

Answer:

A protein has four subunits whose molecular masses are 140, 80, and 60 kDa.

A disulfide bond links the two 80 kDa subunits (possibly identical).

Explanation:

Given that:

A protein has four subunits whose molecular masses are 140, 80, and 60 kDa.

A disulfide bond links the two 80 kDa subunits (possibly identical).

As a result of SDS and dithiothreitol analysis treatment, the molecular masses can not be 360 in total. They are 280, which implies that they are in short of 80 kDa. This means that there are possibilities that two groups with a molecular mass of 80 kDa which are joined by a disulfide bond.

The presence of SDS and dithiothreitol acts as a reducing agent, and they can break disulfide bonds whose pH is greater than 7, i.e. those in basic condition.

The mass of P-32 remaining after 27 days, if the initial mass is 40g is 10.5 g.

The half-life of a radioactive isotope is the amount of time it takes for one-half of the radioactive isotope to decay.

The half-life of a specific radioactive isotope is constant; it is unaffected by conditions and is independent of the initial amount of that isotope.

The number of half lives in 27 days;

n = 27 days/14 days

n = 1.929

The mass of P-32 remaining after 27 days, if the initial mass is 40g;

mass remaining = 40 g / (2^1.929)

mass remaining = 40 g / 3.808

mass remaining = 10.5 g

Thus, the mass of P-32 remaining after 27 days, if the initial mass is 40g is 10.5 g.

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Hello, this is Bing. I can help you with your question. Based on the information I found on the web, **H2** can be broken down into its two atoms of hydrogen (H) by supplying enough energy to overcome the bond that holds them together⁴. This process is called **dissociation** and requires an energy equal to or greater than the **dissociation energy** of H2, which is about 436 kJ/mol⁴.

One way to break down H2 is by using **electricity** to split water (H2O) into hydrogen (H2) and oxygen (O2) through a process called **electrolysis**¹. In this process, water is decomposed into its elements by passing an electric current through it. The electric current is provided by a battery or another source of electricity and the water needs to have an **electrolyte**, such as salt or acid, added to it to make it conductive¹. Two electrodes, usually made of metal or other conductive material, are inserted into the water and connected to the battery. The electrode connected to the positive terminal of the battery is called the **anode** and the one connected to the negative terminal is called the **cathode**¹. When the electric current flows through the water, hydrogen gas bubbles form at the cathode and oxygen gas bubbles form at the anode¹. The overall chemical reaction for electrolysis of water is:

2 H2O → 2 H2 + O2

Another way to break down H2 is by using **heat** to cause a reaction between hydrogen and oxygen that produces water and releases a large amount of energy. This reaction is called **combustion** or **oxidation** and can be ignited by a spark or a flame³. The reaction is very fast and explosive and can be dangerous if not controlled. The overall chemical reaction for combustion of hydrogen is:

2 H2 + O2 → 2 H2O

I hope this helps you understand how H2 can be broken down and what methods are used to do so.

Answer:

A

Explanation:

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The locations with subatomic particles with the least mass are locations 1 and 4.

An atom is usually divided into two main regions:

The three sub-particles previously mentioned (neutrons, protons, and electrons) differ not only in their location but also in their mass. Indeed, electrons have a lower mass if compared to neutrons and protons.

Based on this, the outer region (locations 1 and 4) has sub particles with the least mass.

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Answer:

1 and 4

Explanation:

took the test

Just saying thank you person above you are very great and smart. You deserve a hugeeeeeeee thank you. So, thank you!!!!!!!!!

The elemental particles like the atoms, molecules and compounds present in a given substance is called an Avogadro's number. This number is expressed as \(N_{A}\) and is equal to \(6.022 \times 10^{23} \;\rm mol^{-1}\).

\(8.06 \times 10 ^{23}\) molecules are present in 135 g of Teflon \(\rm C_{2}F_{4}\).

Given,

We have 135 g, so moles will be:

\(\begin{aligned}\rm Moles (n) &=\dfrac{ \rm Mass }{\;\rm Molar \;\rm mass}\\\\\rm n &= \dfrac{135 \rm g }{100.02 \rm g/mol} \\\\\rm n &= 1.34 \;\rm mole\end{aligned}\)

Hence,

1 mole contains \(6.022140857 \times 10^{23}\) (Avogadro's number)

So 1.34 moles will contain,

\(\begin{aligned}&=1.34 \times 6.022140857 \times 10^{23}\\\\&= 8.06 \times 10 ^{23}\;\rm molecules\end{aligned}\)

Therefore, \(8.06 \times 10 ^{23}\) molecules are present in 135 g of Teflon \(\rm C_{2}F_{4}\).

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Chlorine is the most commonly used chemical sanitizer agent and there are so many factors that influences the effectiveness of these chemical sanitizers like- Temperature, Concentration, Contact time, Water Hardness, pH but bacterial cell history does not affect the efficiency of sanitizers.

Factors influencing the effectiveness of chemical sanitizer:

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Answer:

b I think it is the correct answer

Answer:

0.171 M

Explanation:

Step 1: Given data

Step 2: Calculate the moles of solute

The molar mass of H₃PO₄ is 97.99 g/mol.

3.35 g × 1 mol/97.99 g = 0.0342 mol

Step 3: Convert "V" to liters

We will use the conversion factor 1 L = 1000 mL.

200 mL × 1 L/1000 mL = 0.200 L

Step 4: Calculate the molarity of the solution

We will use the definition of molarity.

M = moles of solute / liters of solution

M = 0.0342 mol/0.200 L = 0.171 M

The law of conservation of mass states that in a chemical reaction, the total mass of the reactants is equal to the total mass of the products. To provide evidence for this law, we can perform an experiment in which calcium carbonate (\(CaCO_3\)) is decomposed to produce calcium oxide (CaO) and carbon dioxide (\(CO_2\) ), and then measure the masses of the reactants and products.

Method:

Weigh a sample of \(CaCO_3\) using a balance.

Heat the \(CaCO_3\) in a crucible until it decomposes to CaO and \(CO_2\). The \(CO_2\) gas will escape, leaving only CaO in the crucible.

Allow the crucible to cool and then weigh it again to determine the mass of the CaO produced.

Collect the \(CO_2\) gas that is released during the reaction in a gas syringe or other collection device. Measure the volume of \(CO_2\) gas produced, and calculate its mass using its molecular weight.

Which measurements should be taken:

The following measurements should be taken:

The mass of the \(CaCO_3\) used as a reactant.

The mass of the CaO produced as a product.

The volume of \(CO_2\) gas produced during the reaction.

The temperature and pressure of the \(CO_2\) gas to allow for the calculation of its mass.

How the student could show evidence for the conservation of mass:

To show evidence for the law of conservation of mass, the student can compare the mass of the \(CaCO_3\) used as a reactant to the total mass of the products, which includes the mass of CaO produced and the mass of \(CO_2\) gas released.

The sum of the masses of CaO and \(CO_2\) should be equal to the mass of the \(CaCO_3\) used as a reactant, within experimental error. This will provide evidence that the mass of the reactants is conserved and equals the mass of the products, as required by the law of conservation of mass.

Additionally, the student could calculate the theoretical yield of CaO and CO2 based on the balanced equation for the reaction, and compare this to the actual yield obtained from the experiment. Any difference between the theoretical and actual yields could be due to experimental error, but the comparison can still provide additional evidence for the conservation of mass.

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Answer:

the heat given off is 75 J.

Explanation:

Given;

latent heat of fusion of lead, L= 25 J/g

mass of liquid lead, m = 3.0g

The heat given off is calculated as;

H = Lm

Where;

H is the quantity of heat given off

H = 25 x 3

H = 75 J.

Therefore, the heat given off is 75 J.

Answer:

air,water,rocks,and the ibex

Explanation:

these are the non living things I'm pretty sure

Answer:

From fastest to slowest its: (4)A to B, (1)E to F, (3)C to D, (2)D to E

Explanation:

The steeper the line is the faster she went. D to E she didn't make any progress because the line is straight. Sry I'm terrible at explaining things.

If heat is going into the system, then energy must have come out from the surroundings.

If heat is entering a system, it means that the system is gaining thermal energy, which can lead to an increase in temperature, changes in state, or other effects depending on the nature of the system and the heat transfer mechanism.

The first law of thermodynamics, also known as the law of conservation of energy, states that the total amount of energy in a closed system remains constant, and energy can neither be created nor destroyed, only transferred or converted from one form to another.

When heat enters a system, it is either used to increase the internal energy of the system or to perform work, such as moving a piston or driving an electrical generator.

The amount of heat transferred to a system can be quantified using the equation Q = mcΔT, where Q is the heat transferred, m is the mass of the substance, c is its specific heat capacity, and ΔT is the change in temperature.

Therefore, if the system is gaining energy in the form of heat, then the surroundings (the rest of the universe) must be losing that same amount of energy. This is because energy is conserved.

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Answer:

C. Chemical change

Explanation:

A physical change is where something is changed but it doesnt affect the build up of the chemical. For example, if you broke sticks and threw them on the ground, that would be a physical change because the change is happening to the physical being of the object and not its chemical buildup. However, if you lit those sticks on fire, that would be considered a chemical change because you end up with two substances, ash and the remnants of the stick. A nuclear reaction would result in something blowing up so its not that. And a physical property is like what it looks like or how it smells. Hope I helped you!

The Empirical formula of compound is C₁H₂O₁. The Molecular Formula of the compound is 4 (C₁H₂O₁).

Empirical formula is the simplest whole number ratio of atoms present in given compound.

Element   %   Atomic mass   Relative no. of atoms  Simplest whole ratio

C          40.6       12                   \(\frac{40.6}{12}\) = 3.3                        \(\frac{3.3}{3.3} = 1\)

H          5.1          1                      \(\frac{5.1}{1}\) = 5.1                          \(\frac{5.1}{3.1} = 2\)

O         54.2       16                    \(\frac{54.2}{16}\) = 3.3                        \(\frac{3.3}{3.3} = 1\)

The Empirical formula of compound is C₁H₂O₁ or CH₂O

Molecular formula = Empirical formula × n

\(n = \frac{\text{Molecular weight}}{\text{Empirical Formula weight}}\)

   \(= \frac{118.084}{30}\)

   = 4

Molecular formula = n × Empirical formula

                              = 4 (C₁H₂O₁)

Thus from the above conclusion we can say that The Empirical formula of compound is C₁H₂O₁. The Molecular Formula of the compound is 4 (C₁H₂O₁).

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Answer:

8.59 g

2.25 g

Explanation:

According to the given situation the calculation of grams of PbO and grams of NaCL is shown below:-

Moles of Pb(OH)CL is

\(= \frac{Mass}{Molar\ mass}\)

\(= \frac{10.0 g}{259.65g / mol}\)

= 0.0385 mol

Mass of PbO needed is

\(= 0.385mol Pb(OH) Cl\times \frac{1 mol PbO}{1molpb (OH) cl} \times \frac{223.2g PbO}{1mol PbO}\)

After solving the above equation we will get

= 8.59 g

Mass of NaCL needed is

\(= \frac{1mol\ NaCl}{1molPb\ (OH)Cl} \times \frac{58.45NaCl}{1mol NaCl}\)

After solving the above equation we will get

= 2.25 g

Therefore we have applied the above formula.

The question requires us to choose the best option regarding the bonds of nonmetal atoms.

Nonmetal atoms can form different types of bonds depending on the atom they are bonding to. They can participate in ionic bonds, where electrons are donated or received (exchanged electrons), usually when bonded to a metal (in this case, the metal usually "loses" the electron, while the nonmetal "gains" the electrons). They can also form covalent bonds when the electrons are shared with other nonmetals.

Regarding the options provided by the question, we can make the following comments:

- 1st option: the type of bond described, where electrons can move freely, is typical of metallic bonding;

- 2nd option: gaining electrons describe ionic bonding, while sharing electrons is related to covalent bonding;

- 3rd option: noble gases are the atoms with full valence orbitals.

- 4th option: losing valence electrons is also a description of ionic bonding.

Considering the information above, the best option to answer the question is the second one:

"Nonmetal atoms form bonds by gaining or sharing electrons".

(nonmetals participate in ionic bonds by donating electrons and in covalent bonds by sharing electrons).

Based on the given relative atomic masses of the isotopes, the mass of Na-22 contained in this sample is 0.086 g.

The relative atomic mass of an element is the average mass of one mole of an atom of an element calculated from the atomic masses of the atoms of an element and their relative abundances.

Isotopes of elements are atoms of an element that differ from each other by their masses. The difference in the mass of the isotopes is a result of the difference in the number of neutrons contained within the nucleus of the atoms of the isotopes.

Considering the naturally occurring sodium isotope, Na-23, and the synthetic, radioactive isotope of sodium, Na-22:

the relative atomic mass of Na-23 = 22.9898 u

the relative atomic mass of Na-22 = 21.9944 u.

mass of sample = 2.4698 g

the apparent atomic mass of the isotope = 22.9551 u

Sum of the relative abundances = 1

Let relative abundance of Na-22 = x

relative abundance of Na-22 = 1 - x

22.9898 * (1 - x) + 21.9944 * x = 22.9551

22.9898 - 22.9898x + 21.9944x = 22.9551

0.9954x = 0.0347

x = 0.035

Mass of Na-22 in the sample = 2.4698 * 0.035

Mass of Na-22 in the sample = 0.086 g

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At pOH value  of 6.0 the pH value of the following solution is 8.0 and the concentration of [\(H^{+}\) ] ion is \(10^{-8}\)

In this question we will apply the formula

      pH +pOH = 14 . . . . . . . . . . . . .(1)

where pH = concentration of [\(H^{+}\) ] ion

pOH = concentration of [\(OH^{-}\) ] ion

As per the question

pOH =6.0

Putting the value of pOH in equation (1) we get the value of pH

              pH + 6.0 =14

             pH = 14 -6.0

             pH  = 8.0

 The value of pH if the pOH value is 6.0 is 8.0

To find the concentration of \(H^{+}\) ion we will use the following formula

This is calculated by the formula

                                 [\(H^{+}\)} = \(10^{-pH}\)

where we will write the values of pH

Hence the concentration of [\(H^{+}\)} ion is \(10^{-8}\)

Therefore at  pOH of 6.0 the pH value of the following solution is 8.0 and the concentration of [\(H^{+}\) ] ion is \(10^{-8}\)

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The complete question is -

What is the pH value and concentration of [\(H^{+}\) ] ion of the following if the pOH value of the solution is 6.0 ?

The recipe conversion factor (RCF) is 2.5 (option A).

Recipes often need to be adjusted to meet the needs of different situations. The most common reason to adjust recipes is to change the number of individual portions that the recipe produces.

The most common way to adjust recipes is to use the conversion factor method.

The conversion factor can be obtained by dividing the required yield by the old yield i.e.

Conversion factor = required/new yield/recipe/old yield

Conversion factor = 25/10

Conversion factor = 2.5

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Answer:23.4 torr

Explanation:

For solutions that contain non-volatile solutes, the vapor pressure of the solution can be determined by using the mole fraction of the solvent and the vapor pressure of the pure solvent at the same temperature.

P

sol

=

χ

solvent

⋅

P

∘

solvent

, where

P

sol

is the vapor pressure of the solution

χ

solvent

is the mole fraction of the solvent

P

∘

solvent

is the vapor pressure of the pure solvent

In your case, you know that the vapor pressure of pure water at

25

∘

C

is equal to

23.8

torr. This means that all you have to do is determine the mole fraction of water in the solution.

As you know, mole fraction is defined as the number of moles of a component of a solution divided by the total number of moles present in that solution.

Use glucose and water's respective molar masses to determine how many moles of each you have

18.0

g

⋅

1 mole glucose

180.0

g

=

0.100 moles glucose

and

95.0

g

⋅

1 mole water

18.015

g

=

5.273 moles water

The total number of moles present in the solution will be

n

total

=

n

glucose

+

n

water

n

total

=

0.100

+

5.273

=

5.373 moles

This means that the mole fraction of water will be

χ

water

=

5.273

moles

5.373

moles

=

0.9814

Finally, the vapor pressure of the solution will be

P

sol

=

0.9814

⋅

23.8 torr

=

23.4 torr

The answer is rounded to three sig figs.

Answer:

dog 2 because it is running 1m faster a second than dog 1. Dog 2 can run 1 meter farther in a second than the other dog.

Answer: K=8, C=1, O=12

Explanation:

Answer:

A. 15859.2 L or 15900 L

B. 0.629 mol

Explanation:

At STP, one mole is equal to approximately 22.4 L

L or mL is volume, so you are attempting to solve for L or mL.

A.

708 mol x (22.4 L/1 mol) = 15859.2 L (w/ significant figures included - 15900 L)

B.

(14.1 L) x (1 mole/ 22.4 L) = 0.629 mol.

Answer:

a but it might also be c

Explanation:

i d k what this is

Answer:

2V1

Explanation:

Divergent boundaries and convergent boundaries are the opposite processes that occurs in the tectonic plates.

Divergent boundaries are the regions where new crust is formed when the plates pull away from each other while on the other hand, Convergent boundaries are the regions where crust is destroyed when one plate dives over another.

So we can conclude that Divergent boundaries and convergent boundaries are the opposite processes that occurs in the tectonic plates.

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