the amount of matter in an object is called

Answer:

Density = mass/ volume

Explanation:

57.4g / 11.5cm3 = 4.991304(g/cm)

round to sig figs = 5.00(g/cm)

In functionalized hydrocarbons, a functional group is attached to the core of hydrocarbons (alkanes, alkenes, alkynes). Some examples are methanol (where the hydroxyl group is attached to methane) and it belongs to the chemical class of alcohols.

In organic chemistry, hydrocarbons are organic compounds made entirely of hydrogen and carbon. Hydrocarbons are examples of Group 14 hydrides. Hydrocarbons are generally colorless and hydrophobic, and their odor is usually faint or exemplified by the liquid odor of gasoline or lighters.

Examples of hydrocarbons include gasoline, kerosene, lamp oil, and furniture oil. If someone accidentally drinks a hydrocarbon product that gets into their lungs, it can cause breathing problems. Severe injury or even death can result. Crude oil is a mixture of relatively volatile liquid hydrocarbons (compounds composed primarily of hydrogen and carbon), but it also contains nitrogen, sulfur, and oxygen.

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pCO2 is an important factor that affects various aspects of water chemistry and the impacts of ocean acidification. When pCO2 increases, the concentration of total CO2 dissolved in water also increases. This leads to changes in pH, which decreases due to increasing atmospheric CO2 concentration.

When pCO2 rises, the concentration of only CO2 dissolved in water increases. The dissolved CO2 forms carbonic acid, which contributes to the acidification of the ocean. This increase in CO2 affects the equilibrium between CO2, HCO3-, and CO3^2-, shifting it towards higher levels of dissolved CO2 and H+ ions, resulting in a lower pH.

In terms of the impacts of ocean acidification on different organisms, the effects can vary depending on their specific needs. An organism that requires CO2 is likely to fare better under ocean acidification since the increase in dissolved CO2 can provide them with a favorable environment. However, organisms that rely on HCO3- or CO3^2- may fare worse under ocean acidification, as the lower pH interferes with the availability of these carbonate ions, which are essential for shell formation and calcification in some marine organisms.

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Answer:

Matter is composed of exceedingly small particles called atoms. An atom is the

smallest unit of an element that can participate in a chemical reaction.

Answer:

Chemical reaction.

Explanation:

Answer:

The atomic combinations can be matched to the appropriate functional groups as follows:

- A. C-O-C: C. Ester

- B. O=C-O-H: B. Carboxylic acid

- C. O=C-O-C: C. Ester

- D. C-O-H: A. Alcohol

Explanation:

The different types of the elements does she have available to study are :

Hydrogen, Phosphorus , Oxygen, Carbon, Magnesium, Sulphur, Potassium, Chlorine.

1) The chemical formula of the phosphoric acid is : H₃PO₄

Elements : Hydrogen, phosphorus, oxygen

2) The chemical formula of the glucose is : C₆H₁₂O₆

Elements : Carbon, Hydrogen, oxygen

3) The chemical formula of the Epsom salts  is : MgSO₄

Elements : Magnesium, Sulfur, Oxygen

4) The chemical formula of the chlorate of potash is : KClO₃

Elements : Potassium, Chlorine and Oxygen.

Thus, the Hydrogen, Phosphorus , Oxygen, Carbon, Magnesium, Sulphur, Potassium, Chlorine are the different elements to study.

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Answer: Wheat flour, edible oil, egg white, lettuce preservative, meat or poultry marinade, vegetable antibacterial wash.

Explanation:

hydrogen peroxide is used as a bleaching agent in some food

I hope this helped

Therefore, the internal pressure of the gas in the can when its temperature reaches 433°C is approximately 52.9 atm.

In physics, pressure is defined as the force applied per unit area. It is a scalar quantity and is expressed in units such as pascals (Pa), pounds per square inch (psi), or atmospheres (atm). Pressure can be exerted by a gas or a liquid, and it is related to the density and temperature of the substance. It is an important concept in many areas of science and engineering, including fluid dynamics, thermodynamics, and materials science.

Here,

To solve this problem, we can use the combined gas law, which relates the pressure, volume, and temperature of a gas:

P1V1/T1 = P2V2/T

where P1, V1, and T1 are the initial pressure, volume, and temperature, and P2, V2, and T2 are the final pressure, volume, and temperature.

We can assume that the volume of the can is constant, so V1 = V2. We also need to convert the temperatures to Kelvin by adding 273.15 to them.

Plugging in the given values, we get:

(3.2 atm)(V) / (38°C + 273.15) = P2(V) / (433°C + 273.15)

Simplifying and solving for P2, we get:

P2 = (3.2 atm)(433°C + 273.15) / (38°C + 273.15)

= 52.9 atm

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Boyle's Law, which states that at constant temperature, a gas's pressure and volume are inversely related, can be used to address this issue.

Boyle's Law says that P1V1 = P2V2.

Where: P1 = The gas's initial pressure (in torr)

V1 is the container's initial volume (in millilitres).

P2 stands for the gas's post-volume change pressure (unknown).

V2 is the revised volume of the container (in millilitres).

Let's solve for P2 by entering the provided values into the equation:

P₁ = 757.2 torr

V2 = 132.5 mL V1 = 81.4 mL

P2 = ambiguous

P₁V₁ = P₂V₂

P2 equals 757.2 torr x 81.4 mL x 132.5 mL.

P2 times 132.5 mL = 61702.08 torr * mL

61702.08 torr = P₂ * 132.5

P2 = 132.5 mL / 61702.08 torr

P₂ ≈ 465.69 torr

as a result, the gas's pressure

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The interactions that hold hair strands together and are pH-sensitive are (iii) a disulfide linkage. The correct answer is "iii only".

Disulfide linkages are formed between sulfur atoms in the amino acid cysteine, which is present in the protein structure of hair. These linkages are responsible for the structural stability and strength of hair. When the pH of the hair is altered, such as through the use of chemical treatments or hair products, the disulfide linkages can be disrupted. This can lead to changes in the shape and texture of the hair. Therefore, the presence and integrity of disulfide linkages in hair are pH-sensitive. On the other hand, salt bridges and hydrogen bonds, mentioned in options (i) and (ii) respectively, are not directly pH-sensitive. Salt bridges are ionic interactions that can be influenced by pH indirectly through changes in ionization states of charged amino acids. Hydrogen bonds, while important for the structure of hair, are not directly affected by pH changes.

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653 x 10^23 atoms of sulfur are in the sample.

There are 6.02 x 10^23 molecules in 1 mole of a substance. 1 mole of iron sulfide is composed of 1 mole of iron and 1 mole of sulfur.

1 mole of iron = 55.845 g

1 mole of sulfur = 32.065 g

Therefore, 3492 g of iron sulfide contains:

Iron Molecules = (3492 g x (1 mole / 55.845 g)) = 62.22 moles of iron

Sulfur Molecules = (3492 g x (1 mole / 32.065 g)) = 108.55 moles of sulfur

Number of sulfur atoms = (108.55 moles x (6.02 x 10^23 molecules / 1 mole)) = 653 x 10^23 atoms of sulfur

Iron and sulphur combine to form the inorganic molecule known as iron(||) sulphide. It is a solid that is black and insoluble and is used to make various types of steel as well as some industrial chemicals. Additionally, iron (||) sulphide is employed as a catalyst in some chemical processes.

A compound's atomic composition can be determined by looking at its molecular formula. The types and amounts of atoms that make up a single chemical molecule are identified by the molecular formula. You must divide each element's subscript in the molecular formula by the smallest common multiple of all the subscripts to determine the number of atoms in each element. You will receive the compound's elemental ratio after doing this. To determine the number of atoms in each element, multiply this ratio by the total number of atoms in the compound.

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The density of the sample : 0.827 g/L

In general, the gas equation can be written  

\(\large {\boxed {\bold {PV = nRT}}}\)

where  

P = pressure, atm , N/m²

V = volume, liter  

n = number of moles  

R = gas constant = 0.082 l.atm / mol K (P= atm, v= liter),or 8,314 J/mol K (P=Pa or N/m2, v= m³)

T = temperature, Kelvin  

n= 1 mol

MW Neon = 20,1797 g/mol

mass of Neon :

\(\tt mass=mol\times MW\\\\mass=1\times 20,1797 =20.1797~g\)

The density of the sample :

\(\tt \rho=\dfrac{m}{V}\\\\\rho=\dfrac{20,1797}{24.4}=0.827~g/L\)

or We can use the ideal gas formula ta find density :

\(\tt \rho=\dfrac{P\times MW}{RT}\\\\\rho=\dfrac{1\times 20.1797}{0.082\times 298}\\\\\rho=0.826~g/L\)

The pH of the solution is approximately 4.75.This indicates that the solution is slightly acidic.

To calculate the pH of the solution, we need to determine the concentration of acetate ions and acetic acid. First, let's find the number of moles of sodium acetate:

Mass of sodium acetate = 5.60 g

Molar mass of sodium acetate (CH3COONa) = 82.03 g/mol

Number of moles of sodium acetate = 5.60 g / 82.03 g/mol = 0.068 mol

Next, we need to find the number of moles of acetic acid:

Volume of acetic acid = 15.0 mL = 0.015 L

Concentration of acetic acid = 18.5 M

Number of moles of acetic acid = 18.5 mol/L * 0.015 L = 0.278 mol

Now, we can calculate the total volume of the solution:

Total volume = 1.50 L

The total moles of acetate ions can be calculated by summing the moles of sodium acetate and acetic acid:

Total moles of acetate ions = 0.068 mol + 0.278 mol = 0.346 mol

Now, we calculate the molarity (M) of the acetate ions:

Molarity of acetate ions = Total moles of acetate ions / Total volume

= 0.346 mol / 1.50 L = 0.231 M

Since sodium acetate is a strong electrolyte, it will dissociate completely in water, providing an equal concentration of acetate ions (0.231 M). The concentration of acetic acid is 0.278 M (determined earlier).

The Henderson-Hasselbalch equation can be used to calculate the pH of the solution:

pH = pKa + log([Acetate]/[Acetic Acid])

The pKa of acetic acid is 4.76.

pH = 4.76 + log(0.231/0.278)

≈ 4.75

The pH of the solution is approximately 4.75. This indicates that the solution is slightly acidic. The calculation involved determining the concentrations of acetate ions and acetic acid in the solution and using the Henderson-Hasselbalch equation to calculate the pH.

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Answer:

1.20 grams

Explanation:

Correct on edmentum/plato

Answer: 1.20 grams

Explanation:

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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When the temperature of a gas decrease the pressure also decrease. That is option B.

Temperature is defined as the quantity that measures the degree of how hot or cold an object or medium is.

When the temperature of a medium increases there would be increase in the collision between the molecules that is found in the medium.

The increase in intermolecular collision leads to increase in pressure of the medium. Subsequently, when there is decrease in temperature, the pressure of the medium also falls.

Therefore, it can be said that the temperature of a gas decreases which causes the pressure to also decrease.

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With the rise in temperature,the conductivity also increases.

With rising temperatures, semiconductors' electrical conductivity rises. The conductivity rises as a result of free mobility between the two bands created when electrons from the valence band are able to jump to the conduction band when the temperature rises.

Electrical Conductivity (EC), which is often expressed in Siemens (S) per distance, gauges a material's capacity to transfer an electrical current over a specific distance (usually m-meter). A conductivity meter is used to determine the conductance and read the electrical charge.

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Answer:

Ans. 33.2%

Explanation:

Teacher Told me

Answer:

sodium

Explanation:

Answer:

nếu có 40g dung dịch NaOH 20% phairn dùng hết bao nhiêu gam dung dịch HCl 25% để trung hoà

In the conditions found in a patient 10 hours after aspirin ingestion, where acidosis may be present, the H2CO3/HCO3- system may not work effectively as a buffer.

The effectiveness of the H2CO3/HCO3- system as a buffer depends on the pKa of the weak acid and the pH of the solution. In the case of a patient 10 hours after aspirin ingestion, the conditions may not be suitable for the H2CO3/HCO3- system to work effectively as a buffer.

Aspirin, or acetylsalicylic acid, is metabolized in the body to salicylic acid, which can cause acidosis and decrease the pH of the blood. This decrease in pH can shift the equilibrium of the H2CO3/HCO3- system, affecting its buffering capacity.

Explanation:

The H2CO3/HCO3- system acts as a buffer in the blood by maintaining a stable pH. Carbonic acid (H2CO3) is a weak acid that can dissociate into bicarbonate ions (HCO3-) and hydrogen ions (H+). The bicarbonate ions can act as a reservoir for H+ ions, preventing large changes in pH. The effectiveness of this buffer system is determined by the pKa of carbonic acid, which is around 6.1.

However, when aspirin is ingested, it undergoes metabolism in the body to salicylic acid. Salicylic acid can cause an increase in H+ ions and lead to acidosis, a condition characterized by a decrease in blood pH. Acidosis shifts the equilibrium of the H2CO3/HCO3- system towards the formation of more carbonic acid (H2CO3) and decreases the concentration of bicarbonate ions (HCO3-). As a result, the buffering capacity of the H2CO3/HCO3- system may be compromised, and it may not effectively maintain the pH within the desired range.

Therefore, in the conditions found in a patient 10 hours after aspirin ingestion, where acidosis may be present, the H2CO3/HCO3- system may not work effectively as a buffer. Additional medical intervention may be required to restore and maintain the appropriate pH balance in the body.

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It can be assumed that it is within the acceptable range for domestic use. Rapid temperature changes or high temperatures can also cause damage to pipes and fittings.

Task 3a: Discuss the significance of the measured water parameters collected from Hardap Dam for aquatic life.Water parameters are chemical, biological and physical characteristics of the water. They are important indicators of the quality of water. Hardap Dam is a habitat for a variety of aquatic life such as fish, birds, plants and insects. The measured water parameters for different depths include oxygen, pH and temperature.The concentration of oxygen in the water is crucial to aquatic life. Oxygen is required for respiration by aquatic animals. The surface oxygen concentration of 7.5 mg/L measured in Hardap Dam is adequate for most aquatic life. However, some fish species require higher concentrations of dissolved oxygen to survive. As water depth increases, the oxygen concentration decreases.

This can be seen in the decreasing oxygen concentration at depths below the surface. Low oxygen concentration can lead to suffocation of aquatic life, changes in species composition and nutrient cycling.PH is a measure of the acidity or alkalinity of water. Aquatic life requires a pH range of 6.5-9.0 to survive. The pH of 7.9 measured at the surface of Hardap Dam indicates that the water is slightly alkaline. The pH values for the deeper water layers were not provided but it can be assumed that they are likely to be similar. Extreme pH values can lead to stress and death of aquatic organisms.Temperature is an important parameter that influences the metabolic rates of aquatic organisms. Temperature affects the solubility of oxygen and other gases in water. It also determines the rate of biochemical reactions in organisms. The temperature of the water at the surface of Hardap Dam was not provided.

However, it can be assumed that it is within the range of tolerance for most aquatic organisms.

As water depth increases, temperature decreases. Rapid temperature changes or high temperatures can cause stress and death in aquatic organisms. Task 3b: Evaluate the significance of the measured water parameters in relation to the use of Hardap Dam water for domestic purposes.Water is a critical resource for human survival. Hardap Dam supplies water to communities for domestic purposes. The water quality is important to prevent the spread of diseases and illness. The measured water parameters for different depths of the dam include oxygen, pH and temperature.

These parameters affect the suitability of the water for domestic use.Oxygen concentration in the water is important for the removal of pollutants and odours. The surface oxygen concentration of 7.5 mg/L measured in Hardap Dam is adequate for this purpose. As the water depth increases, oxygen concentration decreases. Low oxygen concentration can lead to unpleasant tastes and odours in the water.PH is important for the taste and aesthetics of water. The pH of 7.9 measured at the surface of Hardap Dam is within the acceptable range for domestic use. Extreme pH values can cause water to taste bitter or metallic.

Changes in pH can also affect the corrosion of pipes and fittings.Temperature can affect the growth of microorganisms in the water. High temperatures can promote the growth of harmful bacteria such as E. coli. The temperature of the water at the surface of Hardap Dam was not provided. However, it can be assumed that it is within the acceptable range for domestic use. Rapid temperature changes or high temperatures can also cause damage to pipes and fittings.

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Therefore, option C is the correct set of quantum numbers for the last electron added to the Cl atom.

To determine the set of quantum numbers for the last electron added to a chlorine (Cl) atom, we need to follow the Aufbau principle, which states that electrons fill orbitals in order of increasing energy.

The electronic configuration of Cl is [Ne] 3s² 3p⁵, which means that the last electron added will occupy one of the 3p orbitals.

The set of quantum numbers that could represent the last electron added to the Cl atom is:

C) n=3, l=2, ml=1, ms=-1/2

Explanation:

1. n = 3 indicates that the electron is in the third energy level.

2. l = 2 indicates that the electron is in a p orbital (since l = 0, 1, or 2 for s, p, and d orbitals, respectively).

3.ml = 1 indicates that the electron is in one of the three p orbitals with magnetic quantum number of 1 (-1, 0, or 1).

4.ms = -1/2 indicates the electron has a spin of -1/2, as all electrons in p orbitals have opposite spin.

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The para-nitro phenyl substituent causes a higher λmax value than the meta-nitro phenyl substituent because it has a greater electron-withdrawing effect due to its position relative to the benzene ring.

The nitro group contains both electron-withdrawing (NO₂) and electron-donating (O) groups, which can affect the electron density of the benzene ring through resonance.

In the para-nitro phenyl substituent, the nitro group is positioned directly opposite to the hydrogen on the carbon that is attached to the ring. This allows for maximum overlap between the nitro group's electron-withdrawing pi-system and the pi-system of the benzene ring, resulting in a greater degree of electron withdrawal from the ring. This reduces the electron density of the ring and causes the λmax value to shift to a higher wavelength.

In the meta-nitro phenyl substituent, the nitro group is positioned one carbon away from the hydrogen on the carbon that is attached to the ring. This results in less efficient overlap between the pi-systems of the nitro group and the benzene ring, resulting in a weaker electron-withdrawing effect on the ring. This leads to a smaller shift in λmax compared to the para-nitro phenyl substituent.

Below are the structures and resonance contributors for para-nitro phenyl substituent and meta-nitro phenyl substituent.

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Answer:

10

Explanation:

Khan Academy

Diagnosis of Mrs. Smith:

Diagnosis for Mrs. Smith for having CK: moderately increased LD: moderately increased LD-1: increased symptoms is "Myocardial infarction".      

Myocardial infarction:

A myocardial infarction, commonly known as a heart attack, occurs when the blood supply to a portion of the heart muscle is inadequate or the cardiac muscle isn't getting enough oxygen in one or more places. The more time that goes by without receiving care to improve blood flow, the more damage the heart muscle sustains.

The majority of myocardial infarctions are brought on by underlying coronary artery disease, which deprives the myocardium of oxygen when coronary arteries are blocked. Myocardial necrosis and cell death can occur if the myocardium is continuously deprived of oxygen.

Signs of myocardial infarction:

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Answer:

6

What do AIA, SAG, AFP and AMA all stand for? Select four options.

American Institute of Architects

American Society of Mechanical Engineers

American Medical Association

Screen Actors Guild

Association for Finance Professionals

Professional Colleges

Noble gas electron configuration for  ion silver, Ag+ is Ag⁺ = [Kr] 4d¹⁰

Noble gas Electronic configuration for Ag is :

atomic number of silver, Ag is 47.

¹⁰⁸Ag₄₇ = 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s²  4p⁶ 4d⁹ 5s²

there is exception : Half filled and full filled d orbital are more stable than the one electron is less. so one electron moves from s orbital to d orbital to make it more stable. so the correct electronic configuration is as follows :

¹⁰⁸Ag₄₇ = 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s²  4p⁶ 4d¹⁰ 5s¹

now for Ag⁺ , we loose one electron. so, the electronic configuration is :

Ag⁺  = 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s²  4p⁶ 4d¹⁰

noble gas configuration for Ag⁺ ion is as follows:

Ag⁺ = [Kr] 4d¹⁰

Thus, Noble gas Electronic configuration for Ag is : Ag⁺ = [Kr] 4d¹⁰ , Ag+ is Ag⁺ = [Kr] 4d¹⁰

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Answer:

isostatic adjustment movement

The element with the symbol "K" refers to potassium. To determine the number of electrons in each energy level (shell) for potassium, we can refer to the periodic table.

Potassium has an atomic number of 19, indicating that it has 19 electrons. The electron configuration of potassium is 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹. Based on this configuration, we can assign the number of electrons in each energy level as follows:

=1 (first energy level): 2 electrons

=2 (second energy level): 8 electrons

=3 (third energy level): 8 electrons

=4 (fourth energy level): 1 electron

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