please helpp i am behind.

15. F

16. E

17. H

18. B

19. G

20. i

21. A

22. C

23. D

You're welcome :)

The threshold quantity for hydrogen sulfide under PSM is 1500 pounds, whereas, under RMP, the threshold is 10,000 pounds.

Each column lists all of the elements that employers must comply with when a process falls under PSM and that specific RMP program in the column header.

By clicking on an element listed in that column, employers can view the regulatory text of both PSM and the RMP program for that element.

As described at the bottom of each of those links, OSHA requirements are in bold, EPA requirements are in italics, and regular font shows areas where the regulatory requirements are identical.

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The molality of the solution is 3.6 molal

The boiling point is the temperature at which the pressure of the system is equal to the atmospheric pressure. Now we know that freezing point depression is one of the colligative properties.

We have that;

ΔT = K m i

ΔT = Freezing point depression

m = molality of the solution

i = Van't Hoff factor

i =1 because the solute is molecular

ΔT = 5.12 oC/molal * m * 1

We can get ΔT from; Freezing point of pure solvent - Freezing point of solution

=  5.49 °c - ( -13.0 °c) = 18.49°c

m = ΔT /k * 1

m = 18.49°c/5.12 oC/molal

m = 3.6 molal

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The PH range of the effective buffer of NAHC2O4 is 3.5-5.2

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1. Sulfur is yellow (chemical)

2. Petroleum gas ignites when exposed to air and fire (chemical)

3. A diamond is a rated a 10 on the Mohs hardness scale (physical)

4. Rubidium has a density of 1.53 g/ml (physical)

5. Hydrogen has a mass of 1.00784 g (physical)

6. melting point of water is 32 degree F (physical,)

7. Copper can be transformed into wire. (physical).

8. 5 ml of water. (physical)

9. Zinc metal reacts quickly with hydrochloric acid to produce Hydrogen gas (chemical)

10. The element sulfur smells like rotten eggs.(chemical)

11. 5 grams of NaCl. (physical)

12. Aluminum is flatten to make aluminum foil (physical).

13. Your old bicycle has rusted (chemical).

The major difference between a physical and chemical change is that a chemical change involves the formation of entirely new substance while a physical change does not create a new substance.

Classification of the substances into physical and chemical substance

1. Sulfur is yellow (chemical, change in color through air reaction is chemical change)

2. Petroleum gas ignites when exposed to air and fire (chemical, combustion is chemical change)

3. A diamond is a rated a 10 on the Mohs hardness scale (physical, no new substance is formed)

4. Rubidium has a density of 1.53 g/ml (physical, no new substance is formed)

5. Hydrogen has a mass of 1.00784 g (physical, no new substance is formed)

6. melting point of water is 32 degree F(physical, no new substance is formed)

7. Copper can be transformed into wire. (physical, no new substance is formed).

8. 5 ml of water. (physical, no new substance is formed)

9. Zinc metal reacts quickly with hydrochloric acid to produce Hydrogen gas (chemical, new substance is formed)

10. The element sulfur smells like rotten eggs.(chemical, new substance is formed which is hydrogen sulfide)

11. 5 grams of NaCl. (physical, no new substance is formed)

12. Aluminum is flatten to make aluminum foil (physical, no new substance is formed).

13. Your old bicycle has rusted (chemical, new substance is formed)

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The temperature while the water is in the process of freezing it is observed that is solidifies .

What is the process of freezing?

The process through which a substance transforms from a liquid to a solid is known as freezing.

When a liquid's molecules slow down enough to attract one another into permanent positions as a solid, this process is known as freezing.

When water freezes, energy is emitted into the environment, which leads energy to be lost and causes the environment to "cool down".

Since it is not thought to exist, the term "cooling" is not well understood in chemical research and would instead be substituted by the phrase "absence or loss of heat."

When a body's temperature drops, it is said to be cooling. If the temperature drops further, as it would with water, it would ultimately approach the freezing point, which for water is 0 degrees Celsius.

As a result, when cooling passes this thermal barrier, the water "freezes." The freezing point of pure water is 0 degrees Celsius. 

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A buffer solution is composed of 8.50 mol of acid and 2.25 mol of the conjugate base.

What is pH of a solution?

The concentration of hydrogen (H+) ions in a solution, which is a measurement of acidity, is known as the pH of that solution. Acidic solutions have a pH under 7. The same holds true for solutions that have a pH higher than 7.

A buffer solution is one that prevents the pH of a solution from changing when a little amount of a strong acid or basic is added.

Given,

pKa of acid = 4.20

[acid] = 8.50

[base] = 2.25

pH of buffer = pKa + log [base]/[acid]

= 4.20 + log[2.25/8.50]

=3.622

Thus, pH of the buffer is 3.662.

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The most common technique used to measure oxygen consumption today is termed open-circuit spirometry.

The method of performing spirometry known as "open circuit" entails the subject inhaling as much air as possible from the surrounding environment, putting the mouthpiece in his or her mouth, and then exhaling either slowly (SVC) or quickly (FVC) until the end-of-test criterion is reached. With devices based on wedge bellows, bell, water seal, or rolling seal cylinder/piston-based volume sensing spirometers, open circuit approach is frequently utilized.

The method of measuring spirometry known as "closed circuit" spirometry involves having the subject place a flow transducer in their mouth, breathe normally for two to three tidal breaths (rest breathing), take a maximal inspiration or expiration through the flow transducer, and then slowly inhale or exhale.

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Answer:

Fe2O3 + 2Al -> 2Fe + Al2O3

Pepsin Pearls helps digest proteins in the stomach.

Here are some important pepsin advantages:

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Force and gravity work together with simple objects exert an equal attractive force

Gravity or gravitational force is the force of attraction between any two objects in the universe and the force of attraction depends on the mass of the object and the square of the distance between them and it is by far the weakest known force in nature the size of the gravitational force is proportional to the masses of the objects and weakens as the distance between them increases and both objects exert an equal attractive force on each other and falling object is attracting the earth with the same size force as the earth is attracting it

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Answer:

B. Energy that is transformed is neither destroyed nor created.

Hope this helps :)

Explanation:

This is what the Law of Conservation of Energy says, "Energy that is transformed is neither destroyed nor created."

All of the glassware do not measure with the same degree of accuracy.

A glassware is an apparatus that could be used for measurement. Most of the glassware are used for the measurement of fluids. In this case, we can see that the kinds of glass ware that could be used for measurement in the laboratory are; Burette, pipette, measuring cylinder etc.

The calibration of all the glassware are not the same, recall that there must always be a measure of uncertainty that goes with the instrument that is used in measurement.

Having known this, we can see that all of the glassware do not measure with the same degree of accuracy.

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The statement 'A subjective question deals with opinions, morals, and emotions and is not suited for science' is the explanation of why a subjective question is inappropriate for the scientific procedure (Option 4).

Opinions are inaccurate for the scientific method because any subjective point of view may bias the process to obtain knowledge, which always must be tested by experimentation.

In conclusion, the statement 'A subjective question deals with opinions, morals, and emotions and is not suited for science' is the explanation of why a subjective question is inappropriate for the scientific procedure (Option 4).

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Water in a 150 ml container volume with a diameter of 12 cm evaporates faster and therefore has a greater vapour pressure than a container with a volume 75 ml and a diameter of 5.5 cm, because the diameter of 150 ml container is more and more space is exposed, so it evaporates more quickly in lesser time.

The vapour pressure is due to escaping tendency of water molecule from surface of liquid. Vapour pressure is dependent on the number of molecules on the surface of liquid.

If number molecules on surface of molecules is greater, greater would be the vapour pressure.

Since, 150 mL container is with 12 cm diameter, its surface area is larger and it has more number of water molecules on the surface. So, it has greater vapour pressure than the 75 ml container and the water also evaporates faster due to large surface area and more exposure.  

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If the components have boiling points that are significantly different from one another, a straightforward distillation is utilized.

What is distillation process?

The technique of selectively boiling and condensing to remove the constituents or chemicals from a liquid mixture is known as distillation, or classical distillation. Heating solid materials to create gaseous products is known as dry distillation.

Distillation is the process of dividing up a mixture into its constituent parts according to their various boiling points. Alcohol purification, desalination, crude oil refinement, and the creation of liquefied gases from air are a few applications for distillation. In the Indus Valley, distillation has been used by humans at least since 3000 BC.

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a) Ch +2, and H2O 0 so complex has 2+

b) Fe +3 and CO3-6 so complex has -3

c)  V +3, H2O 0, Cl -1 so complex has -1

What is meant by complex charge?

A charge transfer complex, also known as the electron donor acceptor complex, is a grouping of two or more molecules or of several chemical components where some electronic charge is transmitted between the molecular entities.

A complexion or coordinating entity's charge number refers to the net charge it carries.

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The solid pieces of lead with a mass of 38.20 g has a density of 11,340 Kg/ m3

The density formula and the procedure we will use is:

ρ = m/v

Where:

Information about the problem:

Applying the density formula, we get:

ρ = m/v

ρ = 38.20 g/ 3.37 cm3

ρ(g/cm3) = 11.34 g/cm3

Converting the density from (g/cm3) to (kg/m3), we get:

11.34 g/cm3 * (1 kg/1000g) * (1000000 cm3/1 m3) = 11,340 Kg/ m3

11.34 g/cm3 is equivalent to 11,340 Kg/ m3

It is a physical quantity that expresses the ratio of the body mass to the volume it occupies.

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Answer:

6.5  x  (  6.02x 10^23)=  3.913  x10^24

Explanation:

Answer:

-5

Explanation:

For what I did was:

Switch the numbers

(35-33)

Do the math

Then add a negative because the smaller number is first meaning it will be a negative number

The pollution in a watershed have such a heavy impact on its inhabitants because  the water combines and the pollutants become more concentrated.

Pollution is defined as the introduction of harmful material to the environment. These harmful material is called pollutant.

Pollutant can be natural such as volcanic ash. They can also be created by human effect.

There are four types of pollution

Thus, the pollution in a watershed have such a heavy impact on its inhabitants because  the water combines and the pollutants become more concentrated.

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We need to do is to try 35% ethyl acetate to see the results.

The term chromatography has to do with the process of separation in which there is a stationary phase and a mobile phase. The stationary phase  in thin layer chromatography is the adsorbent while the mobile phase is the solvent mixture.

The solvent mixture would determine the extent of separation. We know that if the compound is polar, then we need a mixture of a polar solvent and a nonpolar solvent.

The RF of 0.9 implies that the separation was minimal. Thus, what we need to do is to try 35% ethyl acetate to see the results.

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Missing parts;

you use 25% ethyl acetate (an ester) in hexane to run a tlc and obtain a single round spot with an rf of 0.9 for the main compound. what would you do?conclude that the sample is pure.assume that tlc will be useless and find a different way to see if the sample if pure.try a completely different set of solvents, as ethyl acetate and hexanes will never work.try 10% ethyl acetate to see the results.try 35% ethyl acetate to see the results.

A decrease in pH means a rise in positively charged H+ ions, and a rise in the electrical gradient across the membrane. The transport of amino acids into the cell will increase.

How do amino acids move across the cell membrane?

The amino acids are diffused across the cell wall by facilitated diffusion with the help of symporter proteins present in the plasma membrane. These also are called sodium-dependent amino acid transporters.

What do the cells do with the amino acids?

The gastrointestinal system breaks all proteins down into their amino acids so that they can enter the bloodstream. Cells then use the amino acids as building blocks to create enzymes and structural proteins.

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The products of the reaction are (2r,3r) - dibromobutane and (2s,3s)-dibromobutane

Halogenation is a chemical process in which one or more halogens are added to a substance. Due to the widespread presence of halide-containing chemicals, this type of transformation is crucial for producing polymers and pharmaceuticals, among other things.

When a material gets brominated, the chemical reaction causes bromine to be added to the compound. The result's qualities after bromination will be different from the initial reactant.

The bromination of cis - but - 2 - ene is the reaction described. Two items are produced as a result.

Reaction:

cis - but - 2 - ene + Br₂ → (S, S) - 2,3 - dibromobutane + (R, R) - 2,3 - dibromobutane

When cis - but - 2 - ene is reacted with bromines the products of the reactions are ( 2S, 3S) - dibromobutane and ( 2R, 3R ) - dibromobutane, respectively.

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Answer:

I think the answer is assume

In the given redox reaction, the reducing agent is Cd (s).

When a chemical species "donates" an electron to an electron receptor, it is referred to as a reducing agent in chemistry (also referred to as a reductant, electron donor or reducer).

A reducing agent, which is often in one of its lesser oxidation states, serves as the electron donor. The loss of one electron in the redox reaction results in the oxidation of a reducing agent.

At the anode, oxidation reaction occurs:

[tex]Cd (s) \rightarrow Cd^2^+ (aq) + 2e^-[/tex]

At the cathode, reduction reaction occurs:

[tex]2Li^+ (aq) + 2e^- \rightarrow 2Li (s)[/tex]

The overall redox reaction is:

[tex]Cd (s) + 2Li^+ (aq) \rightarrow Cd^2^+ (aq) + 2Li (s)[/tex]

As it is known that the reducing agent is the one that undergoes oxidation in a redox reaction, therefore, Cd (s) is the reducing agent.

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Answer:

The three tests to determine whether the solid is ionic or molecular compound are explained below

What is a Compound?

Chemical substances known as compounds are made up of two or more elements that are bonded chemically in a certain order. Chemistry is the study of the chemical, physical, and structural characteristics of material entities. Realizing that not all gases, liquids, and solids are created equal is crucial.

Explanation:

Firstly, the sample of the substance is taken in a test tube and heated over a flame. If the substance melts, then it is a covalent simple molecular compound and if no melting occurs then it may be either ionic or covalent ionic compound.

Secondly, Dissolve the substance in water or any other polar solvent. If it dissolves, then it can be either ionic or covalent simple molecular compound.

Next, electrolysis can be performed with the aqueous solution, if sample remains unmelted, dissolved in water and conducts electric current, then it is an ionic compound.

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The specific volume of diatomic nitrogen is 13.37 ft³/lb by mass and 0.0265 m³/mol by mole.

1) m(N2) = 1 lb; mass of diatomic nitrogen

V(N2) = 100 gal = 13.37 ft³; volume of diatomic nitrogen

The standard unit for specific volume is cubic meters per kilogram or cubic feet per pound (ft³/lb).

ν = V / m; formula used to calculate specific volume (ν) by mass

ν = 13.37 ft³ / 1 lb

ν = 13.37 ft³/lb; specific volume by mass

2) M(N2) = 28 g/mol = 0.070 lb/mol; molar mass of diatomic nitrogen

n(N2) = 1 lb / 0.070 lb/mol

n(N2) = 14.29 mol; amount of diatomic nitrogen

ν = V / n; formula used to calculate specific volume (ν) by mole

ν = 13.37 ft³ / 14.29 mol

ν = 0.936 ft³/mol = 0.0265 m³/mol; specific volume (ν) by mole

The molar volume has the SI unit of cubic metres per mole (m³/mol)

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