In order of increasing electronegativity is Cl> Se>Mg> Na.
What is electronegativity ?
An atom's capacity to entice shared electrons to itself is measured by its electronegativity. According to the periodic chart, electronegativity typically rises from left to right throughout a period and falls as you move down a group.
What is atoms ?
An atom is a unit of matter that specifically characterizes a chemical element. One or more negatively charged electrons surround the core nucleus of an atom, which is made up of all of them.
We know in periodic table going from left to right the electronegativity increases and going from up to down the electronegativity decreases.
Now given Se is group 16 3rd period element and Cl is group 17 2rd period element thus Cl is more electronegative than Se ...and Na comes before Mg in the period thus the electronegativity order follows-
Therefore, in order of increasing electronegativity is Cl> Se>Mg> Na.
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a radioactive isotope, like 14c, can be used to accurately date something up to about half-lives.
A radioactive isotope, like 14c, can be used to accurately date something up to about half-lives.
Carbon-14 has a half-life of 5,730 ± 40 years (i.e., half the amount of the isotope present at any instant will undergo spontaneous disintegration during the succeeding 5,730 years).
What is an isotope?
The first 80 elements in the periodic table have stable isotopes. The properties of stable isotopes allow their use to understand and manage water and soil resources. They are also used in environmental studies, nutritional assessment and forensic science.Naturally occurring stable isotopes, such as hydrogen isotopes, are used by measuring their abundance and ratio in water samples to determine the age and origin of water, understand its history, and recognize its sources. This is known as isotopic hydrology.To know more about isotopes of elements, click the link given below:
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How many moles are 501 g of OF2?
Answer:
9.278429604639639
Explanation:
Ag3P ionic or molecular
Answer:
ionic ionic ionic
Explanation:
it just is
Oxygen and chlorine gas are mixed in a container with partial pressures of 3040 mmHg
1.63 atm, respectively.
What is the TOTAL pressure inside the container in atm? *Don't forget to convert: 760mmHg
= latm*
Type your answer...
A mixture of oxygen and chlorine gas with a partial pressure of 3040 mmHg and 1.63 atm respectively will have a total pressure of 5.55 atm.
Partial pressure of gas mixturesAccording to Dalton's law of partial pressure, when a gas contains a mixture of gases, the total pressure of the gas mixture is the sum of the individual gas pressure.
This law can be mathematically expressed as:
P (total) = P ₁ + P ₂ + P ₃ + ......
Where P is the pressure of gas and 1, 2, 3, etc., represent the gases respectively.
In this case, the pressure of oxygen is 3040 mmHg. We first need to convert this to atm.
1 mmHg = 0.0013 atm
Thus, 3040 mmHG = 3040 x 0.0013
= 3.952 atm
The pressure of chlorine is 1.63 atm. Thus, the total pressure of the gas mixture would be:
P (total) = P oxygen + P chlorine
= 3.92 + 1.63
= 5.55 atm
In other words, the total pressure inside the container in atm would be 5.55 atm.
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dentify if the following molecule is a strong acid, strong base, weak acid or a weak base. Sodium hydroxide Weak base Strong base Weak acid Strong acid
Sodium hydroxide is classified as strong. strong base: In water, NaOH totally dissociates to produce Na+ and OH.
Because every accessible [OH] in NaOH is present in solution as [OH] and ready to take protons, it is regarded as a strong base.Because it entirely dissociates into sodium cation and hydroxide anion in aqueous solution, sodium hydroxide is a strong basic. One mole of sodium hydroxide will therefore include one mole of sodium cation and one mole of hydroxide anion since one formula unit of sodium hydroxide comprises one sodium cation and one hydroxide anion.Because it completely dissociates into hydroxide ions when placed in water, sodium hydroxide (NaOH) is a strong basic.For more information on strong base kindly visit to
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which of the following species is the richest in healthy omega-3 fatty acids, a type of long chain polyunsaturated fatty acids (lc-pufas)?
The one that is richest in healthy omega-3 fatty acids is the anchovies.
Omega-3 fatty acids, sometimes also called Omega-3 oils are a type of long-chain polyunsaturated fatty acids or PUFAs. They are characterized by their double bond, three atoms away from the terminal methyl group in the chemical structure.
In nature, omega-3 fatty acids are mostly found in marine algae and phytoplankton. However, in foods directly for human consumption, one of the richest sources is fish and fish oils, especially cold-water fatty fish like salmon, tuna, and anchovies. Anchovies are one of the richest, with one serving containing 0.45 grams of EPA and 0.77 grams of DHA.
Your question seems incomplete, but most likely the completed version is as follows:
Which of the following species is the richest in healthy omega-3 fatty acids, a type of long-chain polyunsaturated fatty acids (LC-PUFAs)?
a)Anchovies
b)Cod
c)Halibut
d)Tilapia
e)Tuna
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when a substance goes under evaporation does energy increase or decrease 
Answer:
it decreases and lowers the average energy of the remaining liquid molecules
lab: reaction rate student guide
When changing the concentration of chemical species in an experiment, the rate of chemical reaction can be measured by measuring the amount of the reactants involved or substances produced.
How the measurement of concentration of reactants or products helps in determining the reaction rate.The rate of chemical reactions in a given system is defined as the the speed of rate at which reaction occurs. However, it is also defined as a measure of change in concentration of reactants involved in the chemical reaction or the measure of the change in concentration of substances produced in a reaction per unit time. The time take for this to happen speaks volume of the speed of the reaction rate.
From the context of the task given above, the reaction rate can be measured in a function of the products formed per unit time.
In conclusion, we can now confirm and deduce from step by step explanations above that the concentration of chemical species per unit time is a function of reaction rate.
Complete question:
lab: reaction rate student guide
How would you measure reaction rate in the laboratory when changing concentrations?
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100 POINTS NEED HELP TO FINISH PLEASE PICTURE BELOW
Answer:
OMG!!! very long quescions pls ponints give me answer the quescions is "C"
Answer: C
Explanation:
How many moles of NaOH are present in 27.0 mL of 0.160 M NaOH?
moles of NaOH:
I will thumbs up help please !
it's similar I think explained everything right , I hope I helped
What is the molar mass of a gas with a density of 3.786 g/L at STP? Which noble gas is it most likely to be?
Answer:
The molar mass of a gas can be calculated by dividing the density of the gas by its molar density at STP, which is 0.08206 g/L. Therefore, the molar mass of the gas is 3.786 g/L / 0.08206 g/L = 46.3 g/mol.
The most likely noble gas with a molar mass of 46.3 g/mol is Xenon (Xe), which has a molar mass of 131 g/mol.
Explanation:
How many moles of KOH are contained in 50.0 mL of 6.00 M KOH?
Answer:
The answer is 1.82.
the answer is 0.3 moles
Explanation:
the molarity formula is M=moles/vol in liters
so moles no =M×vol in liters
=6.00×50/1000=0.3 moles
draw the complete lewis diagrams showing all lone pairs for water and ammonia in an orientation that allows for a hydrogen bond. use a line to indicate the location of the hydrogen bond.
With 3 covalent connections to h and 1 lone pair, nitrogen has formed its whole octet, as seen by the Lewis dot picture.
What is the purpose of ammonia?How is nitrate used? Ammonia generated by industries is used as fertilizer in agriculture to the tune of 80%. Ammonia is also used to create polymers, explosives, textiles, pesticides, dyes, and other compounds in addition to its various applications. Additionally, it is utilized to clean water sources.
Do people require ammonia?It is also known as ammonia, aqueous ammonia, or ammonia solution when it is in this form. The majority of ammonia in water converts to ammonium ions, or nH4+. For plant, animal, and human life to exist, ammonia is a necessary component. It is a source that can be found in the air, soil, and water.
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2
Review: Match the gas law to the formula
Dalton's law of Partial Pressure
Combined Gas Law
Gay-Lussac's Law
Charle's Law
Boyle's Law
10 points
au of Partial Pressure states:
PT = P1+ P2+ P3...
P1V1T2 = P2V2T1
P1T2 = P2T1
V1T2 = V2T1
PT = P1+ P2 + P3...
P1V1= P2V2
P1V1= P2V2
The Dalton' law states the relation P = P1 + P2 + P3..... Boyles' law relates the volume and pressure of a gas by the relation P1 V1 = P2V2.
Charles law - V1 T2 = V2 T1
Gay- Lussac's law - P1 T2 = P2 T2. and
Combined gas law - P1 V1 T2 = P2 V2 T1.
What are gase's laws?There are different laws relating the volume , temperature and pressure of a gas. The earlier among them was Dalton's law of partial pressure. Which states that the total pressure of a gas mixture is the sum of partial pressure of individual gases in it.
P = P1 + P2 + P3 ...
Boyle's law states that at constant temperature, the volume and pressure of a gas is in inverse proportion.
Thus P1 V1 = P2 V2.
Charles's law states that at constant pressures, the volume and temperature of a gas are directly proportional .
Thus, V1 T2 = V2 T1.
Gay-Lussac's law proposed that the pressure and temperature of a gas are in direct proportion.
i.e., P1 T2 = P2 T1.
The Boyle's law, Charles's law and Gay-Lussac's law are combined to form the relation as written below:
P1 V1 T2 = P2 V2 T1.
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list the original states (solid, liquid, or gas) of the solute and solvent that are combined to make each of the following solutions.
These are the combinations for the original states (solid, liquid, or gas) of the solute and solvent.
What is solute?
The term "solute" refers to a material that has dissolved in a solution. In fluid solutions, there are more solvent molecules than solute molecules. Salinity and water are two excellent examples of solutes in daily life. The solute is salt because it dissolves in water.
What is solvent?
The ingredients that are utilized as solutes in the formulation are dissolved using solvents. Solids, liquids, or gases may make up these solutes. In order to obtain a solution, a suitable solvent is utilized in conjunction with the solute.
Hypotonic, isotonic and hypertonic solutions (tonicity).
Solute-Solvent Combinations.
Gas-Gas Solutions.
Solid-Solid Solutions.
Liquid-Liquid Solutions.
Therefore, these are the combinations for the original states (solid, liquid, or gas) of the solute and solvent.
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consider the following reaction of nabh4 with a ketone. how many moles of ketone will react with one mole of nabh4?
The moles of ketone will react with one mole of NaBH₄ are 4 moles
Write the balanced chemical equation for the reaction between the ketone and the NaBH₄ first.
4R₂C = O + NaBH₄→(R₂CH - O)₄BNa
As we can see, in order to react with 4 moles of ketone we need 1 mole of NaBH4.
Acetone, the most popular ketone, is a great solvent for many plastics and synthetic fibers, and it can be employed in a variety of applications.
Acetone is frequently employed as a paint thinner and nail polish remover in domestic settings.
It is employed medicinally in the treatment of acne and for chemical peeling. Nylon is produced using the ketone cyclohexanone.
Sodium borohydride works well as a reducer. It works just as well as lithium aluminum hydride for reducing aldehydes and ketones to alcohols while being less potent. Only sodium borohydride is capable of replacing mercury with H in the second phase of the oxymercuration reaction, but it cannot reduce esters, carboxylic acids, or amides.
Your question is incomplete but this is the general answer.
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A gas has an initial volume o 5.32L at 371K. The same gas now has a volume of 4.90 Lat 273
K and 1.03 atm. What was the original pressure of the gas?
Type your answer...
Answer:1.29atm
Explanation: We are given P2,V1,V2,T1, and T2. We are looking for P1.
We can plug it into the combined gas laws formula.
[tex]\frac{(P1)(V1)}{T1} =\frac{(P2)(V2)}{T2}[/tex] [tex]P1=\frac{(P2)(T1)(V2)}{(T2)(V1)}[/tex]P1 = ?
V1 = 5.31 L
T1 = 371 K
P2 = 1.03 atm
V2 = 4.90 L
T2 = 273 K
[tex]P1 = \frac{(1.03)(371)(4.90)}{(273)(5.31)} \\[/tex]
P1 = 1.29 atm
1. A 56.75 gram sample of diamond is heated from 22.365 °C to 45.1 °C. How much energy was required to heat the diamond? The specific heat of diamond is 0.519 J/g°C
Nearly 670 Jule of energy was required to heat the diamond.
What is energy?Energy is the ability to do the work. scientist defines energy as the ability to do work.
The amount of heat gained or we can say lost by a sample (q) can definitely be calculated using to the equation q = mcΔT, where the m is the mass of the sample, c is the specific by the heat, and ΔT is the temperature change.
Here's is the temperature difference is 22.735 °C
Specific heat is 0.519 J/g°C
The mass is 56.75
So heat Q = 56.75(0.519)(22.735)
Or Q =669.61 J or nearly 670 J
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4. Many scientists agree that gluten insensitivity stems from an inability to break bonds. Some scientists blame gluten insensitivity specifically on a lack of human-made enzymes. Other scientists blame it on an imbalance in the microbiome (the bacteria that live in our intestines )How could they both be correct ?
The human digestion-resistant gluten peptides can be broken down by a number of enzymes, including cysteine proteases, and subtilisins.
What is enzyme ?Proteins called enzymes serve as biological catalysts by quickening chemical reactions. Substrates are the molecules that enzymes can interact with, and the enzyme changes the substrates into other molecules known as products.
Human saliva contains Rothia bacteria that can degrade gluten components that trigger an inflammatory immune response and are normally insensitive to the digestion enzymes produced by animals.
Thus, the human digestion-resistant gluten peptides can be broken down by a number of enzymes.
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What is the mole ratio of H to N in the ammonia molecule?
The mole ratio of H to N in the ammonia molecule is 3:1.
What is mole?Mole is defined as the ratio of given mass of substance to the molar mass of that particular substance.
Mathematically,
Mole = Given mass/ Molar mass
As we know that, ammonia have molecular formula NH3.
From this, we can say that one mole of Nitrogen combine with 3 mole of Hydrogen to form a single mole of ammonia.
So, Mole ratio of Nitrogen is given as 1:4.
Mole ratio of Hydrogen is given as 3:4.
Mole ratio of hydrogen to the nitrogen can be given as
Mole ratio of hydrogen/ Mole ratio of Nitrogen
= 3:1
Thus, we concluded that the mole ratio of H to N in the ammonia molecule is 3:1.
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The pH of a fruit juice is 2.5. Find the hydronium ion concentration, [H₃O⁺]of the juices. Use the formula pH=-log[H₃O⁺]
The hydronium ion concentration [H₃O⁺]is approximately_____ moles per liter
(Use scientific notation. Use the multiplication symbol in the math palates as needed. Round to the nearest tenth as needed.)
The hydronium ion concentration [H₃O⁺]is approximately 3.16 x 10^-3 moles per liter.
The pH of a solution is a measure of hydrogen ion concentration, which in turn is a measure of its acidity.
The pH of a fruit juice is 2.5.
To calculate the pH of an aqueous solution you need to know the concentration of the hydronium ion in moles per liter (molarity).
By the formula,
pH=-log[H₃O⁺]
2.5 = -log[H₃O⁺]
-2.5 = log[H3O+]
[H3O+] = antilogarithm(-2.5)
[H3O+] = 3.16 x 10^-3 moles.
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The hydronium ion concentration [H₃O⁺] of a fruit juice with pH 2.5 is 3.16 × 10⁻³ moles per litre.
The pH of a solution is defined as the hydrogen ion concentration present is a substance. The more the hydrogen ion concentration, more is the acidity of the substance.
In order to calculate the pH of an aqueous solution, firstly we must know the concentration of hydronium ion [H₃O⁺] in moles per litre which is given by the formula
pH = -log [H₃O⁺]
From here, another defination of pH is that pH is equl to the negative logarithm of the hydronium ion concentration.
According to the question,
given
pH of fruit juice = 2.5
To find: hydronium ion concentration [H₃O⁺]
Thus, by formula
2.5= -log[H₃O⁺]
[H₃O⁺]= antilogarithm (-2.5)
[H₃O⁺] = 3.16 × 10⁻³ moles per litre.
Thus, the hydronium ion concentration [H₃O⁺] is 3.16 × 10⁻³ moles per litre.
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the two molecules below are isomers. a pure sample of which liquid would have the highest boiling point.
O-dichlorobenzene is the isomer of dichlorobenzene which has highest boiling point.
The boiling point of o-dichlorobenzene is greater than the boiling point of m -and p-dichlorobenzenes due to its greater polar nature. The boiling point order is: o−>m−>p− dichlorobenzene.
What is boiling point?
Boiling point, the temperature at which the pressure exerted by the surroundings on a liquid equals the pressure exerted by the vapor of the liquid; under these conditions, the addition of heat has the effect of converting the liquid into its vapor without raising the temperature.At any temperature, the liquid partially evaporates into the space above it until the pressure exerted by the vapor reaches a characteristic value called the vapor pressure of the liquid at that temperature.As the temperature increases, the vapor pressure increases; at the boiling point, vapor bubbles form in the liquid.To know more about boiling point, click the link given below:
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Which element belongs to the p-block?
O oxygen
O rubidium
O hydrogen
O cobalt
Answer:
Oxygen
Explanation:
Oxygen - p-block (group = 2, period = 16)
Rubidium - s-block (group = 5, period = 1)
Hydrogen - s-block (group = 1, period = 1)
Cobalt - d-block (group = 4, period = 9)
Answer: Oxygen
Explanation:
Question 1-3
A balloon with a volume of 2.50 L is left in a car at 323K. After sitting in the sun, the temperature increases to 398K. What is the volume
of the heated balloon?
Answer:
[tex] \huge{\boxed{3.08 \: L}} [/tex]
Explanation:
The volume of the heated balloon can be found by using the Charles' law formula which is;
[tex] \bold{\frac{V_1}{T_1} = \frac{V_2}{T_2}} \\ [/tex]
where
T1 is the initial temperature
T2 is the final temperature
V1 is the initial volume
V2 is the final volume
From the question
T1 = 323K
T2 = 398K
V1 = 2.5 L V2 = ?
[tex] V_2 = \frac{V_1 \times T_2}{T_1} \\ [/tex]
[tex] V_2 = \frac{2.5 \times 398}{323} = \frac{995}{323} \\ = 3.0804 [/tex]
We have the final answer as
3.08 LWhich of the following is currently most often used to indicate the location of a signal on an IR spectrum?a. frequencyb. wavelengthc. wavelength and wavenumberd. wavenumber
Currently, the method utilised to identify a signal's position on an IR spectrum is called vibration excitation (increase vibration of the bonds or frequency).
The fingerprint area is the range of the infrared spectrum between 1200 and 700 cm-1. By measuring atom vibrations using IR spectroscopy, the functional groups of molecules can be identified.
What device might we employ to find IR?
A radiometer is a device used to find or quantify radiant energy. The phrase is specifically used in reference to instruments used to measure infrared radiation. There are several different types of radiometers, and each has a different measurement method.
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222222222222222222222222222222222222222222
Answer:
Explanation:
Yes
i want to be taught chemistry
When the temperature decreased to
150k, the pressure
K
This shows
us that temperature and pressure
have a.
relationship.
THER ANSWER IS TRUE OKAY?
If 123 kJ of heat are evolved when the reaction described below is carried out, the mass of HCl gas (36.46 g/mol) produced is ____ g.
3 Cl2(g) + PH3 (g) → PCl3 (g) + 3 HCl (g) ∆H = - 570.4 kJ
Based on the heat of reaction, if 123 kJ of heat is evolved when the reaction described below is carried out, the mass of HCl gas (36.46 g/mol) produced is 23.6 g.
What is the heat of a reaction?The heat of a reaction is the amount of heat energy given off or absorbed in the reaction.
During a reaction, energy changes occur as a result of the breaking of bonds in the reactants as well as the formation of bonds in the products.
The sum of the overall energy change that accompanies the formation of products from the reactants gives the heat change of a reaction.
Considering the heat change of the given reaction below:
3 Cl₂ (g) + PH₃ (g) → PCl₃ (g) + 3 HCl (g) ∆H = - 570.4 kJ
The formation of 3 moles of HCl results in the evolution of 570.4 kJ of heat.
If 123 kJ of heat are evolved, then the moles of HCl produced will be:
Moles of HCl produced = 123 kJ * 3 moles / 570.4 kJ
Moles of HCl produced = 0.647 moles
Mass of HCl produced = 0.647 * 36.46
Mass of HCl produced = 23.6 g
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A sample of a certain lead compound contains 12.92 g of lead for 2 g of oxygen. A second sample has mass of 34.27 g and contains 14.39 g of oxygen. Are the two compound the same
The two chemical compounds are not the same, because their ratio is not equal. In both samples the composition of lead and oxygen is different.
What is a chemical compound?A chemical compound is a substance made of numerous similar molecules (or molecular entities) joined by chemical bonds and comprising atoms from various chemical elements. Therefore, a molecule made up of only one type of atom is not a compound. Chemical reactions, which may entail interactions with other molecules, can change a compound into a distinct substance. Atomic bonds may be broken or new ones created during this process.
What are the calculations?sample 1 = mass of lead / mass of oxygen = 12.92g/2g = 6.46 .
sample 2 = mass of lead/ mass of oxygen = 34.27 - 14.39/14.39 = 1.38 .
so, the ratios are not the same.
Hence, the two chemical compounds are not the same, because their ratio is not equal. In both samples the composition of lead and oxygen is different.
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