in a buffer containing acetic acid (ch2cooh) and sodium acetate (nach2coo-) at a ph of 5, if the concentration of sodium acetate is 100. mm, what is the concentration of acetic acid?

The true statement about Matter is that matter is anything that is made up of atoms and that has mass.

Matter is anything which is made up of mass and that has mass. and that occupies space.

If we talk about space, there is no matter because there is nothing but vacuum.

Matter is a general terms given to a group of atoms or molecules which are taken in a general.

We all are made up of atoms, because we al have mass and we all occupy some space. The same goes to anything that we can see or touch or feel that it exist.

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Answer: Matter is anything that is made of atoms and that has mass.

Explanation: I took the test.

The following which are medical applications of radiation include the following below:

This is referred to as the transmission of energy through space and it usually occurs at the speed of light thereby making it a very fast method of heat transfer when compared to the others. Radiation are used for various purposes such as immigration for searching luggage etc.

It is also used for medical reasons such as cancer therapy as the radiation help in destroying the cancerous cells thereby making it easy for their removal from the body system. It is also used for genetic engineering in the creation of new types of substances through the modification of nucleic acids such as DNA etc.

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When a magnesium atom becomes a cation, the size of the radius decreases because it lost electrons (Option A)

Magnesium is a divalent metal. It loses its valence electrons to form a stable octet electronic configuration.

Generally, the ions (or cations) of metals tends to be smaller than their atoms because they lose electrons to form ions.

Now, we shall consider the atom and the ion of magnesium to see the difference. Please see attached photo

Magnesium lose electrons to form ion (cations) as follow:

Mg -> Mg²⁺ + 2e

From the equation and the diagram, we can see that the ion of magnesium is smaller than its atom.

This is so because the magnesium atom has two electrons more than the magnesium ion.

Thus, we can say that the correct option is: decreases because it lost electrons (Option A)

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The main assumption to make is that the density of 5% vinegar is equal to the density of water. Then, for the purposes of the calculation, it is easiest to assume a certain volume of 5% vinegar is used. With these assumptions, we can calculate that the molarity of the solution is 0.83 M.

To calculate the molarity (c) of the solution, we need the number of moles (n) of solute and the volume (V) of the solution:

c = n/V

If we assume that we have 100 mL of 5% vinegar and that its density (d = 1.00 g/mL) is equal to the density of water, we can calculate the mass of the solution (m) using its density and volume (V = 100 mL = 0.100 L):

d = m/V ⇒ m = d*V

m = 1.00 g/mL * 100 mL

m = 100 g

Now we can use the mass and mass percentage (%m = 5% = 0.05) to calculate the mass of acetic acid (AcOH) present:

m(AcOH) = %m * m(solution)

m(AcOH) = 0.05 * 100 g

m(AcOH) = 5 g

Using the mass of AcOH we can calculate the number of moles (n) present by using the molar mass of AcOH (M = 60 g/mol):

n = m/M

n = 5 g / 60 g/mol

n = 0.083 mol

Finally, we calculate the molarity:

c = 0.083 mol / 0.1 L

c = 0.83 M

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A Sample of propane, a component of LP gas has a volume of 35.3L at 315K and 922torr. Its volume at STP is 37.6 L.

STP conditions are defined as a pressure of

100kPa= 100kPa.  1atm / 101  . 325kPa   . 760torr/1atm

= 750.1torr

And a temperature of 0ەC = 0ەC +273.15= 273.15K

So, from here we knew that both pressure and temperature of the gas are changing. Here we use combined gas law equation.

The combined gas law is an amalgamation of the three previously known laws which are Boyle’s law PV = K, Charles law V/T = K, and Gay-Lussac’s law P/T = K. Therefore, the formula of combined gas law is PV/T = K,   Where P = pressure, T = temperature, V = volume, K is constant.

P1V1/T1 = P2V2/T2

Here P1, V1 and T1 are the pressure volume and temperature of the gas at an initial stage.

And P2, V2 and T2 are pressure volume and temperature of the gas at final stage.

So,

  P1V1/T1 = P2V2/T2

= > V2 = (  P1 .T2 /P2.T1).V1

Put all values in the expression.

  V2 = (922torr . 273.15K /750.1torr . 315K ) . 35.3L

        =   37.6 L

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the diagram of downs cell

(a), (b), and (d) are the sets of quantum numbers that are not allowed in the hydrogen atom.

Hydrogen is a single-electronic species i.e. only one electron is accommodated in the orbital. The electronic configuration of hydrogen is 1s¹. It expresses the set of possible quantum numbers for one electron.

The range of 'ℓ' lies between '0' to 'n-1' i.e. '0' to '0'.

The range of 'm' lies between 'ℓ-1' to 'ℓ+1' i.e. '0' to '0'.

(a) n≠3; The principal quantum number representing one electron of hydrogen is '1'.

(b) n≠4; The principal quantum number representing one electron of hydrogen is '1'.

(d) n≠2; The principal quantum number representing one electron of hydrogen is '1'.

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To be considered a true hydrate, a compound must follow a few rules, and one of these rules is the color being the same before and after heating. In this case we have a difference in the color, the residue after heating when dissolved in water is forming a yellow brown solution, and in the meanwhile, a colorless solution is formed when a sample of the original compound is dissolved in water, which is not a characteristic of a true hydrate.

Answer

B. 11.2 grams

Explanation:

Molar mass of CaCl = 110.98 g/mol

Molar mass of KCl = 74.5513 g/mol

From the balanced chemical equation of the reaction given;

1 mole CaCl produced 2 moles KCl.

In grams;

(1 mol x 110.98 g/mol) CaCl produce (2 mol x 74.5513 g/mol) KCl, i.e

110.98 g CaCl produced 149.10236 g KCl,

Therefore, the grams of CaCl needed to produce 15.0 g KCl will be:

Therefore, 11.2 grams of calcium chloride are needed to produce 15.0 g of potassium chloride.

First, let's write the balanced chemical reaction:

2 H2O2 ---MnO2--> 2 H2O + O2

This reaction is a b. Decomposition Reaction of hydrogen peroxide.

Step 1. Let's transform 2.11 mg of H2O2 into moles using the following equation mole = mass / molar mass

Step 2. We are going to use the equation proportion to calculate the quantity in moles of each compound.

Step 3. We are going to transform moles into grams of each compound using the following equation: mass = mole x molar mass

Step 1.

We need to transform 2.11 mg to g. We just need to divide by 1000,

So: 2.11 x 10^-3 g of H2O

mole = 2.11 x 10^-3/34.02

mole = 6.20 x 10^-5 moles

Step 2.

2 moles of H2O2 ---- 2 moles of H2O

6.20 x 10^-5 moles ---- x moles of H2O

x = 6.20 x 10^-5 moles of H2O

2 moles of H2O2 ---- 1 moles of O2

6.20 x 10^-5 moles ---- x moles of O2

x = 3.10 x 10^-5 moles of O2

Step 3.

molar mass of O2 : 32 g/mol

molar mass of H2O: 18 g/mol

mass of H2O = 6.20 x 10^-5 x 18 = 1.12 x 10^-3 g

mass of O2 = 3.10 x 10^-5 x 32 = 9.92 x 10^-4 g

4°c, the temperature of maximum density for water.

Below that point, the crystalline lattice starts to form and the water begins to expand. The density decreases above that temperature as a result of the elevated molecular vibrational activity.

Temperature is a numerical expression of how hot a substance or radiation is. There are three different kinds of temperature scales: those that depend only on macroscopic properties and thermodynamic principles, like Kelvin's original definition; those that depend only on practical empirical properties of particulate matter rather than theoretical principles; and those that depend on the average translational kinetic energy per freely moving microscopic particle, such as an atom, molecule, or electron, in a body, like the SI scale.

A thermometer is used to determine temperature. It is calibrated using a variety of temperature scales, each of which has a distinct historical definition determined by a specific set of reference points and thermometric materials. The Celsius scale is the most widely used scale.

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A molecular of this compound contains 6 hydrogen atoms. An atom is a component of an element. Each atom in a specific element has only one type of atom. Electrons, protons, and neutrons

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The mass of the 13 cm³ of copper, given that 100 cm³ of it has a mass of 890 g is 115.7 g

We'll begin by obtainig the density of the copper. This can be obtained as illustrated below:

Density = mass / volume

Density of copper = 890 / 100

Density of copper = 8.9 g/cm³

Finally, we shall determine the mass of the 13 cm³ of copper. This is obatined as follow:

Density = mass / volume

Cross multiply

Mass = Density × volume

Mass of copper = 8.9 × 13

Mass of copper = 115.7 g

Thus, the mass of the copper is 115.7 g

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The mass of 13 cm³ of copper with a volume of 100 cm³ has a mass of 890 g is 115.7 grams.

Mass is defined as a dimensionless number used to describe the mass of a particle or item.

We'll start by finding out how dense copper is.

Given, Volume = 100 cm³

           Mass = 890 g

Density = Mass / Volume

             = 890 g / 100 cm³

             = 8.9 g/cm³

Now to determine mass is 13 cm³ of copper is

Density = Mass / Volume

So, Mass = Density x Volume

               = 8.9 g/cm³ x 13 cm³

               = 115.7 grams

Thus, the mass of 13 cm³ of copper with a volume of 100 cm³ has a mass of 890 g is 115.7 grams.

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A periodic trend connect a racial trend in American Society ad it affect the distribution of power, wealth, opportunity, and create enduring social stratifications.

It is important to understand racial trends in American Society as it helps in understanding the society better.

A trend is a shift or progression toward something new or different. Global migration is one of the most significant developments nowadays.

Today, 244 million individuals live in nations other than their native countries, which is three times the number in 1960. The world's migrant population would be the sixth largest country.

It should be noted that among the issue of racial trend is also the issue of black lives matter. This is important in order to end discrimination and also enhance the development in the country.

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The number of moles of potassium hydroxide that would react with 1 mole of hydrochloric acid would be 1 mole.

Stoichiometric mole ratio

The stoichiometric moles of species of a reaction are the coefficients of each species in the balanced symbol equation of the reaction.

The balanced equation of the reaction between potassium hydroxide (KOH) and hydrochloric acid (HCl) is expressed as follows:

[tex]KOH + HCl --- > KCl + H_2O[/tex]

In this case, the stoichiometric mole of KOH is 1, that of HCl is 1, that of KCl is 1, and that of [tex]H_2O[/tex] is also 1.

In other words, the stoichiometric mole ratio of KOH and HCl is 1:1. For every 1 mole of KOH, 1 mole of HCl is required for a complete reaction.

Now, the question says what mole of potassium hydroxide will be required to react with 1 mole of hydrochloric acid?

Following the mole ratio, 1 mole of KOH will also be required.

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Answer:

5, the last would be incomplete

Explanation:

The first, inner cloud has 2 electrons, then 8, then 8, then 8, then 3.

Answer:

D. 32.

Explanation:

Remember the formula of atomic mass:

If you go to see the periodic table, you can note that the atomic mass of cobalt is 58.9 amu rounded to 59 amu. Let's solve for '# neutrons' and replace the atomic mass (59) and the atomic number (27) (remember that the number of protons is the same that the atomic number), like this:

The answer would be that the number of neutrons to make a cobalt atom most stable is D. 32.

Sample 1 is you predict greater alcohol production.

The electron transport chain produces the majority of ATP from all three major phases of cellular respiration. Metabolism is the chemical reaction within the body's cells that convert food into energy. Our bodies need this energy to do everything from moving to thinking to growing. Certain proteins in the body control metabolic chemical reactions.

The compound that produces the most ATP when fully oxidized is glucose. Glycolysis and aerobic oxidation of glucose by the TCA cycle generate 32 ATP. However, the acetyl-CoA molecule can not enter glycolysis. Cellular respiration that occurs without oxygen is anaerobic respiration. Cellular respiration that occurs in the presence of oxygen is aerobic respiration.

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Based on the dissociation of each of the given salts, we can calculate that there are b. 51.5 g of chloride ions per liter of the solution.

Each mol of calcium chloride (CaCl₂) dissociates to give 2 moles of chloride ions. The number of moles of chloride ions that comes from calcium chloride is:

2 * 0.200 mol = 0.400 mol

Each mol of magnesium chloride (MgCl₂) dissociates to give 2 moles of chloride ions. The number of moles of chloride ions that comes from magnesium chloride is:

2 * 0.150 mol = 0.300 mol

Each mol of sodium chloride (NaCl) dissociates to give 1 mol of chloride ions. The number of moles of chloride ions that comes from sodium chloride is thus 0.750 mol

The total number of moles (n) of chloride ions in the solution is:

n = 0.400 mol + 0.300 mol + 0.750 mol

n = 1.450 mol

Now, we can use the molar mass of the chloride ion (M = 35.5 g/mol) to calculate the mass (m) of chloride ions in 1 liter of solution:

n = m/M ⇒ m = n*M

m = 1.450 mol * 35.5 g/mol

m = 51.475 g

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Answer:

physical change

Explanation:

melting is a physical change, a physical change does not involve a change in chemical bonds.

Answer:

Explanation:1 g CH

4

​

,C

2

​

H

6

​

C

3

​

H

8

​

C

4

​

H

10

​

T = 350 K, P = 1 atm

PV=nRT=

M

w×R×T

​

1×V=

58

1

​

×0.0821×350

V=0.495 L

V=495cm

3

What's phase diagram?

The phase diagram is a pressure vs temperature sketch. On the graph, the different physical states of any system at variable temperature and pressure are shown.

What's a Triple point?

A triple point is the point on a phase diagram where all three states of a system (solid, liquid, and gas) are in equilibrium.

What's a Critical point?

A critical point is that point on the phase diagram where the boundary between the liquid phase and gaseous phase vanishes away.

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To begin with, sucrose is C12H22O11. Additionally, we must determine how many moles of sucrose there are in a pound of sucrose:

The moles of sucrose are 454g, 342.30g, mol1, and 1.33mol.

Is sucrose a good sugar to use?

Brief Summary According to a University of California, Davis study that was published in the Journal of Clinical Endocrinology and Metabolism, sucrose, the more "natural form of sugar," may be just as harmful to your health as HFCS.

Is sugar a healthy food?

Your body only receives sugar when you consume sucrose like soda or candy, and typically too much of it. The threat is present here. You run the risk of major health problems if you consume too much added sugar (fructose or sucrose) in your diet.

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First, we have to remember the law of conservation of matter:

"The matter can not be created nor destroyed. It can only be transformed".

Then, the answer, in theory, has to be 11.0 g, that is the addition of 5.0 g and 6.0 g.

The disadvantage of increasing our use of solar energy is that unfortunately currently, the production and storage of solar energy is bit as cost efficient when compared to obtaining the same quantity of energy from fossil fuels.



Answer:Dmitri Mendeleev

Explanation:

25 ml of the solution contains 4.83 x 10⁻⁴ moles of CaCl₂.

Concentration, or the amount of solute in a solution, can either be expressed in molarity, M, moles of solute per liter of solution, or molality, m, moles of solute per kilogram of solution.

The concentration of the CaCl₂ solution is 0.0193 M.

Hence, there are 0.0193 moles of CaCl₂ per liter of the solution.

M = 0.0193 M

volume of solution = 25 ml

Multiply the volume by the concentration to get the number of moles.

M = moles of solute / volume of solution

moles of solute = M (volume of solution)

moles of solute = 0.0193 M(25 ml)(1 L / 1000 ml)

moles of solute = 4.83 x 10⁻⁴

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From the diagram showing an example of convection, the label that belongs on the arrow is cooler water sinks while hotter water rises.

Convection currents are currents that are set up by particles of a substance that transfer heat by the process of convection.

Convection is a form of heat transfer in which the particle of the substance transferring heat move from one point to another transferring heat as they move.

Convection is one of the three processes of heat transfer. The two other processes of heat transfer are conduction and radiation.

In the diagram shown, the heat transfer process show is convection.

The heat supplied by the flame is transferred from the bottom of the pot to the top by the movement of the water molecules. Heated water molecules move up while cold water molecules move down to replace them, thus, setting up a convection current.

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In the chemical reaction between Fe(II) ions and dilute sulfuric acid when hydrogen peroxide is added Fe(II) gets converted to Fe(III) ,on retaining mixture and adding NaOH precipitate of ferric hydroxide is obtained.

Chemical reactions are defined as reactions which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical reaction.

There are several characteristics of chemical reactions like change in color, change in state , change in odor and change in composition . During chemical reaction there is also formation of precipitate an insoluble mass of substance or even evolution of gases.

There are three types of chemical reactions:

1) inorganic reactions

2)organic reactions

3) biochemical reactions

During chemical reactions atoms are rearranged and changes are accompanied by an energy change as new substances are formed.

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Answer:

a buffalo

Explanation: if its north America it needs to be native from here none of the other are from north America