the original cell density in a sample if 2.79 x 106 cfu/ml. which sample volume should yield a countable plate? (express your answer as 10x ml).

Answer:

The molecular formula of chalk is caco3.

chalk has 3 elements.

it has one atom of calcium, one atom of carbon and three atom of oxgyen

Gesso is a white paint blend that comprises pigment, chalk and gypsum. It is a medium utilised for surface preparation and as a primer for a painting.

Gesso is widely utilized for preparing surfaces and as primers by painters. They were used by painters and artists earlier to make canvas, boards for painting purposes.

It was first formulated by chalk powder dust and pigment derived from the animal skin. They are widely used because of their adhering properties.

The use of the gesso makes the paint adhere to the canvas and the board surfaces and also, makes the surface textured.

Therefore, option b. it is used for preparing the surface is correct.

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Answer:

b on edge

Explanation:

Answer:

Genotypes are related with the collection of genes expressed in the DNA.

Explanation:

Hello,

In genetics, two specific terms define the characteristics of a living thing; a genotype and a phenotype; thus, phenotypes are related with the physical manifestation of genes, for instance, red hair, blue eyes, long arms and others.

On the other hand, genotypes are related with the collection of genes expressed in the DNA, and they could be for equal alleles or for different alleles, in other words, it is the version of DNA the living thing has.

Regards.

Answer:

2

Explanation:

your answer is correct. The overall balanced equation would be:

2Cu +2HNO3 ----> 2CuNO3 +H2

29.25 grams of NaCl, m.w. 58.5 daltons, are necessary to make 1 liter of 5% saline.

Molar concentration is a unit of measurement for the concentration of a chemical species, specifically a solute, in a solution, expressed as the amount of substance per unit volume of solution. The most often used unit for molarity in chemistry is the number of moles per litre, denoted by the unit symbol mol/L or mol/dm3 in SI units.

A solution's concentration is defined as the quantity of solute present in a given amount of solution. The concentration of any solution is defined as the solute divided by the volume of the solvent or solution. When represented as a percentage, it is known as mass by volume percent.

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If a vincristine vial is found to be broken and spilled then to properly clean the mess, a fully equipped chemo spill kit is used.

The chemo spill kit includes: Two pairs of nitrile gloves, a disposable safety gown, disposable shoe covers, a face shield covering the full face, 21 grams of solidifier, a scoop and scrapper, two wiper pads, a twist tie, and an ID tag.

Vincristine is a solution (liquid) that is administered into the vein. It is usually administered once a week. The drugs used during the process, the response of the body towards the drug and the type of cancer will determine the length of the treatment.

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7.45 atm is the initial pressure of a gas in balloon that has a volume of 14. 0 L and a temperature of 36 C when it was moved into a location with pressure of 5. 0 atm, 6. 0 L and 18. 0 C.

The ideal gas law, which links a gas's pressure, volume, temperature, and number of moles (n), can be used to address this issue:

PV = nRT

where R is the constant of an ideal gas.

We must use the initial circumstances existing before the balloon was relocated in order to determine the gas's initial pressure. The volume (V) and temperature (T) are known, but we still need to determine the amount of gas per mole (n).

n = PV/RT

By considering the starting conditions, we may determine n:

n = (P₁V₁)/(R*T₁)

where P1, V1, and T1 are the starting pressure, volume, and temperature, respectively.

n is calculated as (P114.0 L)/(0.0821L atm/mol*K * (36+273) K).

Now we may utilize the last circumstances to get the gas's final pressure:

P₂V₂ = nRT₂

where T₂ is the final temperature and V₂ the final volume.

P₂ = (nRT₂)/V₂

(P₁V₁T₂) (V₂*T₁)

P₂ is equal to (P114.0 L(18+273 K)/(6.0 L*(36+273 K)).

P₂ = 3.22 atm

The ideal gas law can also be used to determine the initial pressure:

P₁ = nRT₁/V₁

P₁ = (nRT₁)/V₁

P₁ = (14.0 L * 0.0821 L atm/molK * (36+273) K) / (3.22 atm * 6.0 L * (36+273) K).

P₁ = 7.45 atm

As a result, the balloon's gas had a 7.45 atm beginning pressure.

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Answer:

2.5 atm

Explanation:

To find the original pressure of the gas, you need to use the Combined Gas Law. The corresponding equation is:

\(\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}\)

In this equation, "P₁", "V₁", and "T₁" represent the original pressure, volume, and temperature. "P₂", "V₂", and "T₂" represent the new pressure, volume, and temperature.

Before you can plug the given values into the equation and solve for "P₁", you need to convert the temperatures from Celsius to Kelvin (°C + 273 = K).

The final answer should have 2 sig figs like the least accurate given value.

P₁ = ? atm                                          P₂ = 2.0 atm

V₁ = 28 L                                           V₂ = 34 L

T₁ = 45°C + 273 = 318 K                   T₂ = 35°C + 273 = 308 K

\(\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}\)                                            <----- Combined Gas Law

\(\frac{P_1(28L)}{318K}=\frac{(2.0 atm)(34L)}{308K}\)                            <----- Insert values

\(\frac{P_1(28L)}{318K}=0.2208\frac{atm*L}{K}\)                            <----- Simplify right side

\({P_1(28L)}=70.21atm*L\)                         <----- Multiply both sides by 318 K

\(P_1=2.5atm\)                                           <----- Divide both sides by 28 L

The position in extremity from most to least is water, ethanol, ethyl acetic acid derivation, CH3)2CO, 2-butanone, diethyl ether, hexane, and benzene.

From these solvents, ethanol will be totally miscible in water because of its more modest carbon fasten and it's capacity to frame hydrogen bonds.

Water is a polar dissolvable; other polar solvents incorporate CH3)2CO, acetonitrile, dimethylformamide (DMF), dimethylsulfoxide (DMSO), isopropanol, and methanol.

One way you could really work out a dissolvable's extremity is by utilizing its dielectric consistency, which is utilized to quantify how well the dissolvable can part of the way drop the field strength of the electric field of a molecule added to it. The higher the worth of a dissolvable's dielectric consistent, the more polar it will be.

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Option D is correct The circle's arrows point to Cool air is sinking.

Air cooling has the opposite effect. The air bubbles shrink, becoming more dense and sinking because their weight now occupies a smaller volume. This may occur if the air particles move away from the heat source; they may have risen very high, moved to a location over a cool lake, or moved to a location over some shade. The cooled air sinks when it enters a region of high pressure. The air then moves toward the equator's low pressure after returning to the ground. A convection cell is produced when air rises at the equator's low pressure zone and sinks at a high pressure in the direction of either the North or South Pole.

Heat (or energy) is transferred throughout our atmosphere by warm air rising. Convection is the name of this process, and a convection current is the movement of warm air upward and cold air downward. A pot of boiling water on your stove, for example, is a liquid that exhibits these convection currents.

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Answer:

B is incorrect

Explanation:

Ocean are made of salt water which is undrinkable therefore they are not any type of drinking water source.

Answer:

That’s a question on school- what- I-

Explanation:

For a reaction  2Na + 2H2O --> 2NaOH + H2,  The moles of Na needed to produce exactly 5.6 liters of H2 is mathematically given as

moles of H2=0.125mole

Generally, the equation for the  Chemical Reaction is mathematically given as

2Na + 2H2O -> 2NaOH + H2(g)

Therefore, since 2Na gives 1H2

PV=nRT

Hence

n=PV/RT

n=1*5.6/0.0821 *273

n=0.249mols

In conclusion,The moles is

2Na=1H2

moles of H2=0.125mole

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Answer:

The pressure of a given amount of gas is directly proportional to its absolute temperature, provided that the volume does not change (Amontons's law). ... The volume of a given amount of gas is inversely proportional to its pressure when temperature is held constant (Boyle's law).

Answer:

pressure is directly proportional to temperature at constant volume

1. The mass of KClO₃ that decomposed to produce 17.4 g of O₂ is 44.4 g

2. The mass of KClO₃ that formed 23.7 g of KCl is 39.0 g

3. The mole of O₂ that is formed from 1.45 moles of KClO₃ is 2.18 moles

4. The mole of KClO₃ that decomposed to produced 167.7 g of KCl is 0.22 mole

The mass of KClO₃ that decomposed to produce 17.4 g of O₂ can be obtain as follow:

2KClO₃ -> 2KCl + 3O₂

From the balanced equation above,

96 g of O₂ were obtained from 245 g of KClO₃

Therefore,

17.4 g of O₂ will be obtain from = (17.4 × 245) / 96 = 44.4 g of KClO₃

Thus, the mass of KClO₃ that decomposed is 44.4 g

The mass of KClO₃ that formed 23.7 g of KCl can be obtain as follow:

2KClO₃ -> 2KCl + 3O₂

From the balanced equation above,

149 g of KCl were obtained from 245 g of KClO₃

Therefore,

23.7 g of KCl will be obtain from = (23.7 × 245) / 149 = 39.0 g of KClO₃

Thus, the mass of KClO₃ is 39.0 g

The mole of O₂ that is formed from 1.45 moles of KClO₃ can be obtained as follow:

2KClO₃ -> 2KCl + 3O₂

From the balanced equation above,

2 mole of KClO₃ reacted to produce 3 moles of O₂

Therefore,

1.45 moles of KClO₃ will react to produce = (1.45 × 3) / 2 = 2.18 moles of O₂

Thus, the mole of O₂ formed is 2.18 moles

First, we shall obtain the mole of 16.7 g of KCl. Details below:

Mole = mass / molar mass

Mole of KCl = 16.7 / 74.5

Mole of KCl = 0.22 mole

Finally, we shall determine the mole of KClO₃ that decomposed. Details below:

2KClO₃ -> 2KCl + 3O₂

From the balanced equation above,

2 moles of KCl were obtained from 2 moles of KClO₃

Therefore,

0.22 mole of KCl will also be obtain from 0.22 mole of KClO₃

Thus, the mole of KClO₃ that decomposed is 0.22 mole

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The ionization energy trend on the periodic table is highest to the right (moving from left to right across a period) and towards the upper corner (specifically with the noble gases).

The ionization energy trend on the periodic table is highest to the right and upper corner. Ionization energy refers to the amount of energy required to remove an electron from an atom or ion in the gaseous state. As one moves from left to right across a period on the periodic table, the ionization energy generally increases.

This trend can be explained by the concept of effective nuclear charge. Effective nuclear charge refers to the positive charge experienced by an electron in an atom, taking into account the shielding effect of other electrons. As you move from left to right across a period, the number of protons in the nucleus increases, resulting in a higher effective nuclear charge. The increased positive charge pulls the electrons closer to the nucleus, making it more difficult to remove an electron and therefore increasing the ionization energy.

Additionally, moving towards the upper corner of the periodic table, specifically towards the noble gases, the ionization energy also increases. The noble gases have a complete outer electron shell, making them highly stable and resistant to losing or gaining electrons. As a result, their ionization energies are significantly higher compared to other elements because a large amount of energy is required to remove an electron from a stable configuration.

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Answer:

Explanation:

1)  I personally would want to learn more about how the waves in the ocean move. About what causes high tide. What causes low tide. Why some waves are big and some small.  

I know it has something to do with the gravitational pull of the moon. But that is as far as my knowledge extends on the subject. I have always been fascinated with the secrets of the ocean and the secrets of space. To me learning, this is a little of both.

2)  The nature of the interaction between neutrons and protons in the atomic nucleus, which binds the nucleons together, is the biggest wonder in the inside of the atom that I would like to really know. Protons have a positive charge, but neutrons do not. What form of interaction between a charged particle and an uncharged particle is possible? That is what I expect to learn more about as a result of my explorations into the inner workings of the atom.

The inside of the atom is made up of the nucleus and electrons that travel about in orbits. The nucleus is made up of protons and neutrons. Electrons have a negative charge, protons have a positive charge, and neutrons have none. The nucleus is held together by electrostatic interaction between electrons and protons. The majority of the mass of an atom is made up of protons and neutrons.

I'm interested in finding out more about ocean waves travel. regarding the reason for high tide. what brings on a low tide. Although some waves become also large while others are smaller.

Ocean waves seem to be alterations to the ocean's surface. They could be produced by water being moved by the wind, gravity, as well as other forces.

A disturbance that moves from one place to another across a medium has been referred to as a wave. As an illustration of a wave, think of a sinuous wave.

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Pauli Exclusion Principle, states that an atomic orbital can only hold maximum of 2 electrons, each with opposite spins. So, the correct choice is option (a).

The Pauli Exclusion Principle is a quantum mechanical principle that states that no two electrons in the same atom can have the same value for all four quantum numbers. That is no more than two electrons in can occupy the same orbital, and two electrons in the same orbital in must have opposite spins.

Austrian, Wolfgang Pauli proposed this idea in 1925. After reading a paper on quantum states in 1924, Pauli decided to add a fourth value to the classical three values used to describe the state of electrons. Two other scientists, Samuel Goudsmit and George Uhlenbeck, defined the fourth quantum quantity as the electron's spin. So option (a) is the correct option.

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Complete question:

What is the Pauli Exclusion Principle?

a) An atomic orbital can only hold a maximum of 2 electrons, each with opposite spins.

b) An atomic orbital can hold a minimum of 6 electrons, each with opposite spins

c) An atomic orbital can hold a maximum of 6 electrons, each with the same spin

d) An atomic orbital can hold a minimum of 2 electrons, each with opposite spins

Answer:

hydroelectric

Explanation:

No, the volume of water in a beaker is not an extensive property.

Extensive properties are those that depend on the amount or size of the substance being measured. In other words, they are properties that change with the quantity of the substance. Examples of extensive properties include mass, volume, and total energy.

In the given scenario, the volume of water in the beaker is 50 milliliters. This volume remains the same regardless of the quantity of water present. Whether it's 50 milliliters or 500 milliliters, the volume measurement does not change. Therefore, the volume of water in the beaker is an example of an intensive property.

Intensive properties are independent of the amount or size of the substance. They are characteristics that remain constant regardless of the quantity of the substance. Examples of intensive properties include temperature, density, and color.

It's important to note that the distinction between extensive and intensive properties depends on the specific property being considered. While volume is typically an extensive property for a bulk substance, in the case of a fixed volume of water in a beaker, it becomes an intensive property.

In summary, the volume of water in a beaker is not an extensive property but rather an intensive property because it does not change with the quantity of the substance.

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Answer: 265.95 kelvins

Explanation:

Looked it up on google

The reactivity of metals increases from right to left because metals are electropositive in nature.

Metals react by electron loss. The more reactive metals are able to loose electron easily. However, the ability of metals to loose electrons decreases from left to right. This means that as you move towards the right, metals steadily loose the ability to loose electrons easily.

As a result of this, the reactivity of metals increases from right to left as we move towards those metals that loose electrons easily.

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The whole Patterns of Reactivity Quick Check for Honors Chemistry is

1) B. Metals on the right have more protons, causing valence electrons to be held more strongly.

2) B. by gaining electrons

3) B. They are very nonreactive

4) A. Cs and Br

5) A. Rb loses an electron

Answer:

Difference in temperature.

Explanation:

Conduction is the movement of heat energy through a substance or from one substance to another by direct contact of atoms and molecules. Heat moves directly from one molecule to another. The heat energy speeds up the movement of the atoms and they collide with other molecules setting them into faster motion.

Answer:

independent variable -- different batteries

dependent variable -- the time that clock stop

Explanation:

In an experiment or a research study, there are two type of variables that can affect the result of the experiment or the conclusion. They are independent variable and the dependent variable.

An independent variable may be defined as that variable in an experiment which can be changed or can be controlled in the scientific experiment in order to test the effect on the dependent variable. It cannot be changed by other variables.

On the other hand, dependent variable are those are those which can be altered or change that can affect the experiment.

In the context, Emily uses  the different types of the batteries as an independent variable and the time where the clock stopped in the dependent variable in her research.

The molarity of the malonic acid solution is 0.080 M.

To find the molarity of the malonic acid solution, we need to use the balanced chemical equation and the volume and concentration of the NaOH solution used in the titration. According to the equation, one mole of NaOH reacts with one mole of malonic acid to produce one mole of sodium malonate and two moles of water.
First, we need to calculate the number of moles of NaOH used in the titration. This can be done by multiplying the volume of NaOH solution used (20.76 mL) by its concentration (0.1000 M) and converting to moles:
moles of NaOH = 20.76 mL * 0.1000 mol/L = 0.002076 mol
Since the balanced equation shows that the ratio of moles of NaOH to moles of malonic acid is 2:1, we can determine the number of moles of malonic acid in the solution:
moles of malonic acid = 0.002076 mol * (\frac{1 mol malonic acid}{2 mol NaOH}) = 0.001038 mol
Finally, we can calculate the molarity of the malonic acid solution using the volume of the solution used in the titration (12.95 mL):
molarity of malonic acid = \frac{moles of malonic acid}{volume of malonic acid solution}
= \frac{0.001038 mol}{0.01295 L}
= 0.080 M
Therefore, the molarity of the malonic acid solution is 0.080 M.

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Answer:

Concept: Advanced Chemistry Analysis

The bond angles around the central atom of the molecule can be determined with the help of the structural formula.

The structural formula of a compound can be described as a graphic representation of the molecular structure, showing how the atoms are possibly arranged in real 3-D space. The chemical bonding within the molecule is shown and provides a more complete representation of the molecular structure.

For example, chemical compounds exist in different isomers, which have different enantiomers but the same molecular formula.

There are multiple types of structural formulas such as Lewis Structures, condensed formulas, Newman projections, conformations, Haworth projections, and Fischer projections.

Lewis structures provide molecular geometry which changes based on the presence of bonds and lone pairs and via we could determine the bond angles and hybridization also.

The bond angle between the bond can be determined from the structural formulas such as linear shape having a bond angle 180°.

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Answer:

All of the Above

A.The number of reactants is the same as the number of products.

B.The compounds are the same on each side of the reaction.

C.The number of atoms of each element is the same on each side of the equation.

D.The state of matter is the same on each side of the equation.

Explanation:

Answer:

C

Explanation:

I did the test

Comparing the electronegativities of the two elements is one method of predicting the type of bond that will form between them.

Ionic bonds are produced between atoms of metals and non-metals where the metal loses an electron to complete its octet and the non-metal acquires that electron to complete its octet. Covalent bonds are formed when two atoms share electrons to complete their octets.

Ionic chemicals are bound together by ionic bonds, whereas covalent compounds are held together by strong covalent bonds. While covalent molecules are normally insoluble in water, ionic compounds are. Additionally, covalent molecules are typically more flammable than ionic ones.

If the electronegativity of the two atoms differs by enough to allow one to totally draw an electron away from the other, the connection is ionic.

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