Answer: 1. Immediately flush the area with lukewarm water for 30 minutes.
2. Remove clothing and jewelry from the affected area.
3.Wait to see if symptoms appear.
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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How many moles are 501 g of OF2?
Answer:
9.278429604639639
Explanation:
Which of these is a product of respiration.
A. CO2
B. O2
C. C2H4
D. H2
Answer:
A. CO2
Explanation:
Cellular respiration converts oxygen and glucose into water and carbon dioxide. Water and carbon dioxide are by-products.
Answer: A. CO2
Explanation: The body uses oxygen or O2 to help resperate the cells, and CO2 is created as a biproduct and released back into then environment through exhalation.
using periodic trends, arrange the following atoms in order of increasing electronegativity: se, cl, mg, na se < cl < mg < na se < mg < na < cl na < mg < cl < se mg < na < se < cl na < mg < se < cl
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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HELP ME WITH MY EARTH/SPACE SCI QUESTIONS! REAL ANSWERS ONLY!
in 2-3 sentences. must answer both questions!
1) How are human activities guided by the availability of fresh water?
2) How can sustainability practices manage freshwater resources?
1 Human activities may be varied by the addition of freshwater because it can determine/vary what food, crops, and sea animals that come into the area. Additionally, it has determined when civilizations have thrived and begun or unfortunately fail and in extreme measures go extinct.
2 Practices that can help us as human beings include showers, drinking water, washing hands, etc. When we use some of these examples they help us keep clean and live life with a low risk of sickness.
the rtoxic byproducts of amino acid breakdown must be excreted which of th folowing is not of thr mina functions of nitrogen exxcreteion
Answer:
The toxic by-products of amino acid breakdown must be excreted. Which of the following is NOT one of the main forms of nitrogen excretion
Explanation:
hope this helps
what is electron afinity
Answer: electron affinity is the ability of an atom to accept an electron.
Explanation:
As the name suggests, electron affinity is the ability of an atom to accept an electron. Unlike electronegativity, electron affinity is a quantitative measurement of the energy change that occurs when an electron is added to a neutral gas atom. The more negative the electron affinity value, the higher an atom's affinity for electrons.
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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The ocean pressure at the depth of the titanic wreck is 40500. kPa. Calculate the ocean pressure in atm. Round your answer to 5 significant digits.
Answer:
399.80 atm
Explanation:
Since there are 101.3 kPa per every 1 atm, you need to divide the given number by 101.3 to convert the pressure from kPa to atm.
1 atm = 101.3 kPa
40500. kPa 1 atm
--------------------- x -------------------- = 399.80 atm
101.3 kPa
May I have help with this question please
The answer is Sap from a rubber tree
Answer:
c. sap from a rubber tree
Explanation:
most plastics ending in "ene" are synthetic or at least partly synthetic. sap is naturally occurring in nature.
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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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:
Which of the following information is primarily obtained from nuclear magnetic resonance spectroscopy? arrangement of carbon and hydrogen atoms in a compound molecular weight of a compound any conjugated system present in a compound functional groups present in a compound all of these
The correct option is a). arrangement of carbon and hydrogen atoms in a compound.
Define NMR spectroscopy.
Numerous nuclei have spin, and all nuclei are electrically charged, according to the NMR underlying principle. Energy can go from the base energy to a higher energy level if an external magnetic field is provided.
NMR spectroscopy, also known as nuclear magnetic resonance, has evolved as the method of choice for figuring out the structure of organic compounds. It is the only spectroscopic technique for which a thorough examination and analysis of the entire spectrum is often expected.
Therefore, the correct option is a). arrangement of carbon and hydrogen atoms in a compound.
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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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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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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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Water molecules sticking to dew
on the grass is an example of
100 POINTS HELP PLEASEEEEEE WILL GIVE BRAINLIEST
B. approximate size of the apple
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:
What process is being shown in this diagram?
precipitation
metathesis
dissolution
combustion
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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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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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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4) How many moles of a gas occupy 347.8 mL, at 4.369 x 10 atm o and 25.00 C?
The number of moles of gas occupies 347.8 mL, at 4.369 x 10 atm at 25 degrees C. is 0.0041843391.
What is the mole?The mole is the amount of substance in a system that contains the same number of elementary entities as there are atoms in 0.012 kilograms of carbon 12; it is denoted by the symbol "mol."
The mole, symbol mol, is the SI unit of the material amount of a specified elementary entity, which may be an atom, molecule, ion, electron, any other particle, or a specified group of such particles; its magnitude is set by fixing the numerical value of the Avogadro constant to be exactly 6.022 141 29 1023 when expressed in the SI unit mol-1.
Calculation:We can use the Ideal Gas Law to solve this problem.
PV = nRT
where, Atmosphere pressure P is 4.369 x 10 atm.
Volume V must be expressed in liters, so it will be 0.347.8 L,
and n is the number of moles(n) (and its unknown in this particular question)
R is the universal gas constant (R =.08206 L a t m L/ m o l K ).
T is the temperature in degrees Celsius (degree C + 273 = K, so 25 degrees C + 273 = 298. K).
So we can say,
n = 0.3478*43.49/298*0.08206
n(mole) = 0.0041843391
The number of moles of gas occupies 347.8 mL, at 4.369 x 10 atm at 25 degrees C is 0.0041843391.
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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
when a new chiral center is generated from a radical halogenation reaction, the product mixture always consists of one enantiomer in greater quantity than the other enantiomer.
When a new chirality center is created during a radical halogenation process, an optically active mixture is formed.
What is a mixture?
In chemistry, a mixture is a material composed of two or more different chemicals that are not chemically bonded.A mixture is a physical combination of two or more substances in which identities are preserved and are mixed in the form of solutions, suspensions and colloids.Mixtures are the single product of mechanical mixing or mixing of chemical substances, such as elements and compounds, without chemical bonding or other chemical change, so that each component retains its own chemical properties and composition.Despite the fact that there are no chemical changes to its constituents, the physical properties of the mixture, such as its melting point, may differ from those of the constituents. Some mixtures can be separated into components by physical (mechanical or thermal) means.To know more about mixture, click the link given below:
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When the temperature decreased to
150k, the pressure
K
This shows
us that temperature and pressure
have a.
relationship.
THER ANSWER IS TRUE OKAY?
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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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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4) How many moles of a gas occupy 347.8 mL, at 4.369 x 10 atm o and 25.00 C?
Number of moles, n=0.61.Thus, 0.61 number of moles of a gas molecules are required to occupy 347.8ml×10 atm and 25.00 C
What is ideal gas law?
An ideal gas is an assumed gas composed of many randomly moving point particles that are not affected by interparticle interactions. Thus, ideal gas law is equation of state of hypothetical ideal gas.
Ideal gas law, PV= nRT
Calculation:A ideal gas law equation is
PV=nRT
P is pressure. It's unit should be atmosphere (=4.369×10atm)
V is volume. It's unit should be in litres (=347.8mL= 0.3478 L )
n is number of moles =?
R is universal gas constant (=0.08206 atm. L/mol. K)
T is temperature in K, (= 25 C= 25+273= 298K)
4.369×10 ×0.3478 = n ×0.0826 ×298
Number of mole n = 4.369×10×0.03478/0.0826×25
Thus, the main answer is that the number of moles, n = .61
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