O2 transport in a person alternates between convection and diffusion. what best explains this pattern?

Answer:

C

Explanation:

Water freezes from the TOP DOWN. An example can be when you take the ice thingy container and when you pour water into it to form an ice cube for your drink leave it for a couple of minutes, it’ll freeze from the top and it can be easily break when u compress on it by your finger.

A is possible. But, it’s wrong.

In addition, the density of water is more than ice. Which allows the ice float ontop of the water.

Option B is incorrect.

When liquid water is cooled, it contracts like one would expect until a temperature of approximately 4 degrees Celsius is reached. After that, it expands slightly until it reaches the freezing point, and then when it freezes it expands. (When water reaches 0 °C it turns into an ice cube so, the ice cube has a higher volume than water)

C is possible, too.

D is wrong.

The major products formed when benzene reacts with the following reagents are :

(a) tert-butylbenzene

(b) bromobenzene

(c) mixture (ortho-nitrobenzene, meta-nitrobenzene, para-nitrobenzene)

(d) benzaldehyde

(e) nitrobenzene

(a) The major product formed when benzene reacts with tert-butyl bromide and \(AlCl_3\) is tert-butylbenzene.

(b) The major product formed when benzene reacts with bromine and a nail (iron) is bromobenzene.

(c) The major product formed when benzene reacts with iodine and \(HNO_3\) is a mixture of ortho-nitrobenzene, meta-nitrobenzene, and para-nitrobenzene.

(d) The major product formed when benzene reacts with carbon monoxide, HCl, and \(AlCl_3\)/CuCl is benzaldehyde.

(e) The major product formed when benzene reacts with nitric acid and sulfuric acid is nitrobenzene.

To learn more about bromobenzene follow the link:

https://brainly.com/question/32141237

#SPJ4

During metabolism, atp is produced by chemical reactions, is broken down to fuel those reactions, and is transported from one cell to another.

What is metabolism?

The chemical processes in the body's cells known as metabolism convert food into energy. In order for our bodies to move, think, and grow, they require this energy. The chemical events that occur during metabolism are regulated by specific proteins in the body.

Therefore, During metabolism, atp is produced by chemical reactions, is broken down to fuel those reactions, and is transported from one cell to another.

To learn more about metabolism

Here: https://brainly.com/question/1490181

#SPJ4

They are called Periods. Lesser known as series

Minerals with covalent bonding, such as diamond, are typically very hard. Metallic bonding results in minerals that are malleable and ductile, but not necessarily hard.

Van der Waals bonding is weaker and results in minerals that are relatively soft and have a low melting point.

The four types of bonding that are important in minerals are covalent, metallic, Van der Waals. The property of a mineral's resistance to scratching is called hardness.

Hardness is a physical property of minerals that describes their resistance to scratching by other minerals or materials. The Mohs scale is a way of ranking minerals according to their hardness.

The scale runs from 1 (the softest mineral, talc) to 10 (the hardest mineral, diamond). Minerals with covalent bonding, such as diamond, are typically very hard. Metallic bonding results in minerals that are malleable and ductile, but not necessarily hard.

Van der Waals bonding is weaker and results in minerals that are relatively soft and have a low melting point.

To know more about necessarily visit:

https://brainly.com/question/32679605

#SPJ11

Answer:

390.6 gram

Explanation:

Mass in gram = no of moles × molar mass

Mass in gram = 21.7×18

= 390.6 gram

Answer:

390.931576 grams

Answer:

30 I guess

Explanation:

The subsequent association of peptide fragments on the surface of antigen-presenting cells with MHC class I or class II molecules .

Option D is correct .

Lymphocytes can perceive antigens when they are shown on cell surfaces. Antigen-presenting cells (APCs), of which dendritic cells, B cells, and macrophages are the most important, are responsible for this.

The proteasome breaks down antibodies into peptide fragments. After that, these peptides are moved from the cytosol into the lumen of the endoplasmic reticulum (ER), where a number of chaperones, including a tapasin-specific chaperone in the peptide-loading complex, keep MHC I in wait for peptides.

Learn more about peptide fragments :

brainly.com/question/30891505

#SPJ4

The responding variable refers to the variable that changes as the independent variable is being manipulated. In this case, the responding variable is the number of paper clips attracted by the magnet.

An experiment must include a dependent (responding) variable and an independent variable. As the independent variable is manipulated during the experiment, the dependent (responding) variable changes accordingly.

In this case; the independent variable is temperature while the dependent (responding) variable is the number of paper clips attracted by the magnet.

Learn more: https://brainly.com/question/967776

Answer:

B

Explanation:

When it freezes, it will be a solid. The molecules will barely move, not as much as in the other answer choices.  

Answer: c

Explanation: effusion because there is a movement of a gas through a small opening into a larger volume

Answer:

docx it is a science document

Answer:

The new volume of the air inside when the cabin is pressurized to 75 kPa is 37818.\(\overline 6\) m³

Explanation:

The given 747 airplane parameters are;

The volume of air in the airplane, V₁ = 28,000 m³

The pressure of the air on the ground, P₁ = 101.3 kPa

The pressure of the air once it is in flight, P₂ = 75 kPa

Let V₂ represent the new volume of the air inside when the cabin is pressurized to 75 kPa

Boyle's Law states that the pressure of a given mass of air is inversely proportional to its volume at constant temperature

Therefore, by Boyle's law, we have;

P ∝ 1/V and P₁·V₁ = P₂·V₂

Which gives;

V₂ = P₁·V₁/P₂

Substituting the known values, we get;

V₂ = 101.3 kPa × 28,000 m³/(75 kPa) = 37818.\(\overline 6\) m³

The new volume of the air inside when the cabin is pressurized to 75 kPa = V₂ = 37818.\(\overline 6\) m³.

Answer:

26.9%

Explanation:

I just took the test! :)

The percentage by mass of solution formed by dissolving 36.0 grams of HCl in 98.0 grams of water is 36.7%.

The percentage by mass of a solution can be calculated by dividing the mass of the solute by the mass of the solvent, then, multiplied by 100.

percent by mass = mass of solute/mass of solvent × 100

According to this question, 36.0 grams of HCl is dissolved in 98.0 grams of water. The percentage by mass is calculated as follows:

percent by mass = 36g/98g × 100

percent by mass = 36.7%.

Therefore, the percentage by mass of solution formed by dissolving 36.0 grams of HCl in 98.0 grams of water is 36.7%.

Learn more about percentage by mass at: https://brainly.com/question/16885872

The magnitude of the concentration that LiOH(aq) employs to neutralize the reaction is 0.125 M.

\(M__{H_{2}SO_4 }\) = M₁ = 0,050 M

\(V__{H_{2}SO_4 }\) = V₁  = 20,0 ml

\(V__{LiOH }\) = V₂ = 8,00 ml

Thus, solving for the final morality is:

M₁V₁ = M₂V₂

M₂ = \(\frac{M_1V_1}{V_{2}}\)

So, plugging in the values we obtain:

M₂ =  \(\frac{0,050x20,0}{8,00}\)

M₂ = 1 : 8,00

M₂ = 0,125 M

Then the magnitude of the concentration that LiOH employs to neutralize the reaction is 0.125 M.

Learn more about calculating the concentration of the solution at https://brainly.com/question/19091247

#SPJ4

One 250ml beaker, a ph probe, 15ml of hcl, 15ml of Naoh, Various substances for pH measurement and 60ml of water are required to determine the ph of different substances.

To determine the pH of different substances, the following materials and steps are required:

Materials:

1. One 250ml beaker

2. pH probe or pH meter

3. 15ml of hydrochloric acid (HCl)

4. 15ml of sodium hydroxide (NaOH)

5. Various substances for pH measurement

6. 60ml of water

Procedure to measure the pH:

1. Start by filling the 250ml beaker with 60ml of water.

2. Immerse the pH probe or pH meter into the beaker, ensuring that it is properly calibrated according to the manufacturer's instructions.

3. Measure 15 ml of hydrochloric acid (HCl) using a graduated cylinder and add it to the beaker.

4. Measure 15 ml of sodium hydroxide (NaOH) using a graduated cylinder and add it to the beaker.

5. Stir the mixture gently to ensure proper mixing of the substances.

6. Take a sample of the substance whose pH needs to be determined and add it to the beaker.

7. Observe the pH reading on the pH probe or pH meter display.

8. Rinse the pH probe or pH meter with distilled water between measurements to avoid contamination.

9. Repeat the steps for each substance to obtain its respective pH value.

To know more about sodium hydroxide,

https://brainly.com/question/10073865

#SPJ4

Answer:

The correct option is;

a. 255.0 g

Explanation:

The given information are;

Mass of propane, C₃H₈ in the combustion reaction = 156.06 g

The equation of the combustion reaction is C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

From the balanced chemical equation of the reaction, we have;

One mole of propane, C₃H₈ reacts with five moles oxygen gas, O₂, to form three moles of carbon dioxide, CO₂, and  four moles of water, H₂O

The molar mass of propane gas = 44.1 g/mol

The number of moles, n, of propane gas = Mass of propane gas/(Molar mass of propane gas) = 156.06/44.1 = 3.54 moles

Given that one mole of propane gas produces 4 moles of water molecule (steam) H₂O, 3.54 moles of propane gas will produce 4×3.54 = 14.16 moles of  (steam) H₂O

The mass of one mole of H₂O = 18.01528 g/mol

The mass of 14.16 moles of H₂O = 14.16 × 18.01528 = 255.0 g

The mass of H₂O produced = 255.0 g

There are approximately 0.000486 moles of hydrogen present in the sample.

To find the number of moles of hydrogen present in the sample, you need to use the ideal gas law equation, which is PV = nRT where P is the pressure of the gas (in atm), V is the volume of the gas (in L), n is the number of moles of gas, R is the ideal gas constant, and T is the temperature of the gas (in K). First, you need to convert the pressure from torr to atm. You can do this by dividing the pressure in torr by 760, since 1 atm is equal to 760 torr. In this case, the pressure in atm would be: P = 764.5 torr / 760 = 1.0059 atm Next, you need to convert the volume from ml to L. You can do this by dividing the volume in ml by 1000, since 1 L is equal to 1000 ml. In this case, the volume in L would be: V = 30.42 ml / 1000 = 0.03042 L Finally, you need to convert the temperature from degrees Celsius to Kelvin. You can do this by adding 273.15 to the temperature in Celsius. In this case, the temperature in K would be:T = 25.58 degrees Celsius + 273.15 = 298.73 K Now that you have all the necessary values, you can plug them into the ideal gas law equation to solve for the number of moles of hydrogen: n = (PV) / (RT) = (1.0059 atm * 0.03042 L) / (8.31 J/mol*K * 298.73 K) = 4.86 x 10^-4 mol Therefore, there are approximately 0.000486 moles of hydrogen present in the sample

To know more about moles-

https://brainly.com/question/20486415

#SPJ4

When you raise and push down the pressure pump handle, you are adding more gas molecules to the container.

When you click on the bucket to raise the temperature of the container, the pressure of the gas increases.

When you click on the bucket to reduce the temperature of the container, the pressure of the gas decreases.

The gas law that mathematically shows the relationship between temperature and pressure is known as the ideal gas law. The ideal gas law is represented by the equation: PV = nRT

where:

P is the pressure of the gas,

V is the volume of the gas,

n is the number of moles of the gas,

R is the ideal gas constant, and

T is the temperature of the gas in Kelvin.

According to the ideal gas law, when the volume is kept constant (as mentioned in the simulation), the relationship between temperature and pressure is directly proportional. This means that if the temperature increases, the pressure will also increase, and if the temperature decreases, the pressure will decrease.

Learn more about pressure on

https://brainly.com/question/28012687

#SPJ1

Answer:Click on the bucket to raise the temperature of the container to approximately 400 K (127°C). What happened to the pressure?

✔ increased

Approximately what pressure range did you observe?

✔ 7.5–8.3 atm

3. Click on the bucket to reduce the temperature to approximately 200 K (−73°C). What happened to the pressure?

✔ decreased

Approximately what pressure did you observe?

✔ 3.5–4.3 atm

4. What gas law mathematically shows the relationships between temperature and pressure?

✔ Gay-Lussac’s law

Explanation:

Answer:

large atoms have Valence electrons further from the nucleus and lose them more readily.

Answer:

1. summer 2 spring 3 winter 4 fall/autumn

Cooler temps can cool down the outside and inside air.

Explanation:

Answer:It may be colder because during el nino years the normal prevailing winds are disrupted or reversed, causing it to be cooler than normal years, if prevailing winds were disrupted this could cause a change in temperatures as the winds direct currents through  the equator.

Answer:

-

Alcohol-related diseases frequently cause low Mg+ levels.

- Mg+ deficiencies must be treated before potassium (K+) deficiencies.

- Mg+ deficiencies often result in low serum potassium (K+)

- Mg++ levels present similarly to calcium (Ca++) levels in the blood.

- Vomiting is not generally seen as a major cause of Mg+ loss

When you get into a car that has been sitting in the sun for a while, there are several noticeable things that may occur. Here are some of the common observations:

1. Heat: One of the first things you'll notice is the intense heat inside the car. This is because the sun's rays have been absorbed by the car's exterior and trapped inside, creating a greenhouse effect. The temperature inside the car can become significantly higher than the temperature outside.

2. Hot Surfaces: The surfaces inside the car, such as the seats, dashboard, steering wheel, and metal parts, can become extremely hot to the touch. This is due to the absorption of heat from the sun. It's important to be cautious and avoid direct contact with these hot surfaces to prevent burns or discomfort.

3. Odor: The interior of the car may have a distinct smell when it has been sitting in the sun for a while. This is often referred to as the "hot car smell." It is caused by the combination of materials, such as upholstery, plastic, and carpet, heating up and emitting a specific odor.

4. Fading or Discoloration: Prolonged exposure to sunlight can cause fading or discoloration of materials inside the car. For example, the upholstery, dashboard, and other surfaces may gradually lose their original color and become faded or discolored over time.

5. Glare: When you first enter a car that has been sitting in the sun, you may notice a strong glare from the sunlight reflecting off the windshield and other glass surfaces. This glare can make it difficult to see clearly and may require the use of sunglasses or adjusting the sun visors to minimize the brightness.

It's important to note that these observations may vary depending on factors such as the intensity of the sunlight, the duration the car has been in the sun, and the materials used in the car's interior. Regular maintenance and taking precautions, such as using sunshades or parking in shaded areas, can help minimize some of these effects.

to know more about the greenhouse effect here:

brainly.com/question/31595505

#SPJ11

Answer:

A. prove hypotheses to be correct is the correct answer I think

Explanation:

A scientific theory has been defined as a thorough explanation of the facts and includes the hypothesis and laws. The scientific theory allows scientists to prove the hypothesis to be correct. Thus, option A is correct.

Scientific theories have been the summary of the universal and natural sciences that are well sustained and never proved. They are based on observable explanations and information that were tested through experimentation.

It uses experimental and research setup to prove the hypothesis to be credible by the conclusions and findings that are also supported by the scientific laws. They are reliable conclusions and are just not guesses.

Therefore, option A. scientific theories are used to prove the reliability of the hypothesis.

Learn more about scientific theories, here:

https://brainly.com/question/17050172

#SPJ2

The correct answer for this question is Decreases.

How quickly or slowly a reaction proceeds is known as the rate of reaction or speed of reaction for a reactant or product. As the reaction progresses, the rate of reaction slows because the initial concentration of the reactants is high, but as time goes on, this concentration falls, making the reaction slower. As a result, the rate of reaction is dependent on concentration and diminishes over time.

To know more about Rate of Reaction, click here:

https://brainly.com/question/13440548

#SPJ4

Answer:

a. H2O: dihydrogen monoxide

b. PCl5: Phosphorus pentachloride

c. SiF4: Silicon tetrafluoride

d. N20: dinitrogen oxide

From the slope of the graph, the experiment’s results lie close to the best fit line and have no noticeable outliers; it is reliable; option D

A line of best fit is a line that plots a range of data to the approximately best value.

The line of best will minimized the variation between several points in the data.

Considering the data points plotted, the slope of the whole line can be derived as:

slope = Δy / Δx

slope = (3.4 - 0.8) / (0.6 - 0.1)

slope = 5.2

Taking the slope from the intercept of the line of best fit on the y-axis

Slope = (3.4 - 0.4) / (0.6 - 0.0)

slope = 5.0

Therefore, the data is reliable.

Learn more about the line of best fit at: https://brainly.com/question/1518824

#SPJ1

Answer:

The sugar in DNA is deoxyribose. ... Nucleotides in DNA contain four different nitrogenous bases: Thymine, Cytosine, Adenine, or Guanine. There are two groups of bases: Pyrimidines: Cytosine and Thymine each have a single six-member ring.

Adenine, Cytosine, Thymine, and Guanine are the four nucleotides that make up DNA. The four nucleotides have different base structures, but they are all composed of a nitrogenous base, a deoxyribose sugar, and a phosphate group.

Nucleotides are organic compounds made up of a phosphate and a nucleoside. They function as monomeric units of the deoxyribonucleic acid and ribonucleic acid polymers, which are both crucial macromolecules for all kinds of life on Earth.

Adenine, Cytosine, Thymine, and Guanine are the four nucleotides that make up DNA. The four nucleotides have different base structures, but they are all composed of a nitrogenous base, a deoxyribose sugar, and a phosphate group.

The quantity of phosphate residues that a nucleotide has determined its name. Adenosine triphosphate, for instance, is the name of a nucleotide that consists of an adenine base and three phosphate residues (ATP). Adenosine diphosphate would be the nucleotide if it has two phosphates (ADP).

Thus, Adenine, Cytosine, Thymine, and Guanine are the four nucleotides that make up DNA.

To learn more about nucleotides, follow the link;

https://brainly.com/question/967810

#SPJ2