The amount of energy, in Joules, that the food contains will be 414.8 Joules
Calories to Joule conversionAccording to metrics, 1 kilocalorie = 4184 Joules.
100 Calories = 100/1000 = 0.1 kiloCalories.
0.1 kilocalories = 0.1 x 4184 = 414.8 Joules
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43. The student hopes the samples are gold, which has a density of 19.3 g/mL. A
local geologist suggest the samples might be pyrite, which is a mineral with a density
of 5.01 g/mL. What is the identity of the unknown sample?
44.Calculate the percent error of each sample. Use the density value given in question
above.
14.3-
TA
45.Was the data collected by the student accurate? Explain your answer.
Therefore, since the density of the samples are closer to the density of pyrite (5.01 g/cm³) we conclude that the samples are more like to be pyrite.
What is pyrite?pyrite, also called iron pyrite or fool’s gold, a naturally occurring iron disulfide mineral. The name comes from the Greek word pyr, “fire,” because pyrite emits sparks when struck by metal. Pyrite is called fool’s gold; to the novice its colour is deceptively similar to that of a gold nugget. Nodules of pyrite have been found in prehistoric burial mounds, which suggests their use as a means of producing fire.Wheel-lock guns, in which a spring-driven serrated wheel rotated against a piece of pyrite, were used before development of the flintlock. Pure pyrite (FeS2) contains 46.67 percent iron and 53.33 percent sulfur by weight. Its crystals display isometric symmetry. For detailed physical properties, see sulfide mineral.To learn more about sulfide mineral refer to:
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What is the percent composition by mass of aluminum in al2(so4)3 (gram formula mass = 342 grams)?.
The percent composition by mass of aluminum in al2(so4)3 (gram formula mass = 342 grams) is 15.8%.
Why is the formula of Aluminum sulphate Al2 SO4 3?Aluminum sulphate is an ionic compound, a combination of both positive and negative ions. Ions are charged atom, which may either be monatomic ions (single atoms) or polyatomic (multiple atoms combined to form a charged part). Aluminum forms a + 3 ion, Al+3, and sulphate is the -2 polyatomic ion, (SO4)-2
So there are two aluminum atoms, three sulfur atoms, and 12 oxygen atoms in a single unit of the compound Al2(SO4)3. This sums to 17. Therefore, there are 17 atoms in a single unit of the compound Al2(SO4)3. The formula for aluminum sulfate is Al2(SO4)3. Then, in a formula unit of Al2(SO4)3 there are two aluminum ions and three sulfate ions; or two aluminum, three sulfur, and twelve oxygen atoms.
Determination of percent composition of aluminum:Total amu of this compound = 342
Therefore, percent composition of Aluminum = 54/342 x100 = 15.8%
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What is the number of nitrogen molecules that reacted with excess hydrogen to make 2 x 10^10 molecules of ammonia?
Stoichiometry and the mole concept state that a reaction between 1 x 1010 molecules and extra hydrogen produced 2 x 1010 molecules of ammonia.
What does stoichiometry mean?A chemical reaction's stoichiometry involves figuring out the ratios of its constituent elements or molecules. The underlying laws of the associated relationships are the law of mass preservation and the law on combining weights & volumes.
To determine the amounts of different compounds contained in the sample, stoichiometry is employed in quantitative analysis.
The balance of chemical equations requires it.
In the example provided, since 1 molecule of nitrogen creates 2 molecules of ammonia, 2 x 1010 molecules o ammonia will be created when 2 x 10101/2=1 molecule.
As a result, 1 x 1010 molecules formed 2 x 1010 molecules of ammonia when they were combined with extra hydrogen.
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In an ionic bond, how do you tell the number of electrons transferred from atom to atom. Would it be two ions formed in the reaction or no?
Example, Lithium + Chlorine
Answer:
Explanation:
In an ionic bond, atoms transfer electrons in order to achieve a stable electron configuration, also known as a full valence shell. The number of electrons transferred from one atom to another can be determined by the difference in their electron configurations.
In the example of lithium and chlorine forming an ionic bond, lithium (Li) has one valence electron and chlorine (Cl) has seven valence electrons. In order for both atoms to achieve a stable electron configuration, Li would transfer its one valence electron to Cl. This results in the formation of two ions: Li+ and Cl-.
It is important to note that for a reaction to be ionic, it must involve the transfer of electrons from one atom to another. In the case of Lithium and Chlorine it is ionic because electrons are transferred from Li to Cl.
How many cyanide atoms are in gallium cyanide
How many cyanide atoms are in gallium cyanide?
51 CGaN
Consider the molecule c4H5n, which has the connectivity shown below.
After the Lewis structure for the molecule is completed, how many sigma and how many pi bonds are there in this molecule?
Express your answers as integers separated by a comma.
How many atoms in the molecule exhibit sp hybridization, sp^2 hybridization, and sp^3 hybridization?
Express your answers as integers separated by commas. Express your answers in the given order.
sp hybridization, sp^2 hybridization, and sp^3 hybridization:
The marketed medications with pyrrole ring systems are known to have a wide range of biological properties, including the antipsychotic, beta-adrenergic antagonist, anxiolytic, anticancer (leukemia, lymphoma, and myelofibrosis, among others), antibacterial, antifungal, antiprotozoal, antimalarial, and many more.
The relative abundances of the three identified C4H5 isomers vary depending on the type of precursor (1-butyne, 1,2-butadiene, and 1,3-butadiene). The overproduction of hydroxyhempyrolin is what causes pyrrole disorder (HPL). The HPL binds zinc and B6, preventing the body from utilizing them and causes their excretion in the urine and hair. HPL is a neurotoxic biomarker for oxidative stress. Kryptopyrrole testing in the urine is used to identify pyrrole disorders. The goal is to count the HPL molecules in your body. A high level could be a sign of pyrrole dysfunction.
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Let's shift the nitrogen and carbon atoms from left to right since the answer is 2,2,1. Three hydrogen atoms bonded to one carbon form an SP3 hybrid on carbon.
Carbon hybridised with carbon on both sides in SP. There is a triple bond tying these two carbon atoms together. Bonding between carbon atoms and N's SP hybridization Prior to N, the penultimate C is SP2 hybridised (2 bonds and 1 lone pair). The C and N in question have two bonds.
Answer: 2,2,1 Atoms, which are little bits of matter, are what distinguish one chemical element from the others. A negatively charged core nucleus and one or more orbiting electrons make up an atom. There may be the positively charged, somewhat massive protons and neutrons that make up the nucleus.
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Three 75.0g samples of copper, silver, and gold are available. Each of these samples is initially at 24.0°C, and then 2.00kJ of heat is applied to each sample. Which sample will end up at the highest temperature?
The temperature of the copper sample will be the highest.
What uses does copper have?
Due to its ductility and excellent conductivity, copper is mostly used in electrical generators, home and auto wiring, as well as the wires in electronics like radios, TVs, computers, lighting, and motors.
A metal or a nonmetal, is copper?
Just on Periodic Table of Elements, copper is the 29th element. It is regarded as a moderately, nonferrous, malleable metals with countless uses in the fields of electrical and electronics, plumbing, construction projects & architecture, business, transportation, & consumer and health items.
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Suppose, in the near future, the problems with creating energy through nuclear fusion reactions are overcome. What
are some of the advantages of using a fusion reactor to produce electricity?
Answer:
Nuclear Fusion reactions power the Sun and other stars. In a fusion reaction, two light nuclei merge to form a single heavier nucleus.
Explanation:
Explain what happens to dry ice when it is exposed to air. What does it look like? Please write two
to three sentences about how this happens.
Dry ice, also known as solid carbon dioxide, sublimes when exposed to air. As dry ice sublimes, it appears to be "smoking" or "fogging" due to the condensation of the gaseous carbon dioxide in the air.
What is dry ice?Dry ice, also known as solid carbon dioxide, is a type of carbon dioxide that is in a solid state at temperatures below -109.3°F (-78.5°C). Unlike regular ice, which is made of water, dry ice is made of carbon dioxide. Due to its extremely low temperature, it is used primarily as a cooling agent, and often used to preserve food and medical products during transportation. It can also be used as a cleaning agent in industrial settings to remove oil and grease from machinery. Dry ice is also used in the dry ice blasting process which is an alternative to traditional cleaning methods like sand blasting and soda blasting. Dry ice is not stable at ambient temperature and pressure, it sublimes, meaning it goes from a solid to a gas without going through the liquid phase. This process causes it to shrink and disappear over time.To learn more about dry ice refer:
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Which has the highest Zeff for its valence electrons?
F
Li
OC
Na
The highest zeff , effective nuclear charge for its valence electron from the give option is the F with the value of 5.2.
The Zeff can be calculated by the following formula :
Zeff = Z - s
where ,
Z is the atomic number
s is the shielding effect
F = 9 - (0.35 × 6 + 0.85 × 2 )
F = 5.2 for its valence electrons.
Li = 3 - 1.7
= 1.3
O = 8 - ( 2 × 0.85 + 5 × 0.35 )
= 4.5
C = 6 - (2 × 0.85 + 3 × 0.35)
= 3.25
Na = 11 - ( 2 × 1 ) + ( 8 × 0.85 )
Na = 2.20
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Thompson changed out the
metal and still consistently
observed the same cathode ray.
What did this observation mean
for atomic theory?
A. The atomic is a small hard sphere.
B. The atom is indivisible.
C. The atom contained something small and
negative.
D. The atom is mostly empty space.
Thompson's model concluded that the atom contained something small and negative. The correct option to this question is C.
What is Thompson's model?Thomson's description of the atomic model is one of many scientific models of the atom. Created by J.J. Thomson in 1904, shortly after the electron was discovered. However, the atomic nucleus had not yet been discovered at that time. So he proposed a model based on the known properties available at the time. Known properties are:
Atoms are neutrally charged
Inside an atom are negatively charged particles called electrons. According to the assumptions of Thomson's atomic model, an atom resembles a positively charged sphere with electrons (negatively charged particles) inside.
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How did ethanol use affect the shortage of corn available to consumers during and after the drought of 2012?.
Ethanol use was effect the shortage of corn available on those time because of corn is an ingredient to produce the ethanol. Hence, ethanol use was aligned with the rarity of corn availability on those time. the more ethanol was used, the more rare corn availability for consumer.
What is the effect of the drought?The drought is a condition where the area cant provide enough water supply for a long. Agriculture sector is the most affected sector when the drought occur. The drought cause crop failure, and this condition create domino effect on another sector such as food price get more expensive, and because of food get more expensive, buying power getting low cause small business out of business.
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If a car can accelerate at 7.5 mi/hr/s, what would be its final speed after 5.0 seconds if its starting speed were 50 mi/hr?
Final speed after 5.0 seconds if its starting speed were 50 mi/hr is 87.5 mi/hr.
What is acceleration?Acceleration is a vector quantity, meaning it has both a magnitude (or size) and a direction. The magnitude of acceleration is measured in units of meters per second squared (m/s²) or feet per second squared (ft/s²). The direction of acceleration is the direction in which the velocity of an object is changing.
There are different types of acceleration:
Positive acceleration refers to an increase in velocity, for example, when an object speeds up.
Negative acceleration or deceleration refers to a decrease in velocity, for example, when an object slows down.
Constant acceleration refers to when the rate of change of velocity is constant, for example, when an object is falling freely under the influence of gravity.
Zero acceleration refers to when an object is moving at a constant velocity, for example, when an object is moving in a straight line at a constant speed.
To calculate the final speed of a car that can accelerate at 7.5 mi/hr/s, we can use the equation:
final speed = initial speed + acceleration x time
In this case, the initial speed is 50 mi/hr, the acceleration is 7.5 mi/hr/s, and the time is 5.0 seconds.
So, the final speed would be:
50 mi/hr + (7.5 mi/hr/s x 5.0 s) = 50 mi/hr + 37.5 mi/hr = 87.5 mi/hr
Therefore, the final speed of the car after 5.0 seconds would be 87.5 mi/hr.
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Under what conditions in the ideal gas assumption suitable for real gases How do you relate between R and Ru?
The ideal gas assumption is suitable for real gases when the temperature is high and the pressure is low.
The ideal gas law relates the pressure, volume, and temperature of a gas to the number of molecules present in a given volume. The constant R is the ideal gas constant and Ru is the universal gas constant.
These two constants are related by the equation Ru = R/M, where M is the molar mass of the gas. So, R is the gas constant for a particular gas, while Ru is the gas constant for all gases.
The ideal gas law is valid when the temperature is high, the pressure is low, and the volume of the gas is large compared to the volume of the molecules.
In these conditions, the ideal gas model is suitable for real gases because the molecules don’t interact significantly with each other and the volume of the gas is much larger than the volume of the molecules. Hence, the ideal gas law accurately models the behavior of the real gas.
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Which of the physical states of water contains particles with the highest kinetic energy?A. WaterB. Melting IceC. SteamD. Ice
Option - C : Steam is the physical states of water contains particles with the highest kinetic energy. Because water in a gaseous form, has its particles moving around the most. Therefore, having the highest kinetic energy .
Kinetic energy is the energy that a moving item possesses. An item can only be accelerated through the application of a force. Applying force requires effort on our part. Following completion of the work, energy is transferred to the object, which then moves at a new, constant speed. Kinetic energy is the force that drives motion, and it may be observed in the motion of objects and subatomic particles. Every particle and moving object contains kinetic energy. Walking, a baseball flying through the air, food falling from a table, and a charged particle in an electric field are some examples of kinetic energy in action. The power is the energy , an object in motion possesses.
The word "kinetic" derives from the Greek "kinesis," which means motion.
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Maltose is a disaccharide formed by the formation of _______ bond between glucose and ________.
Maltose is a disaccharide formed by the formation of alpha 1,4glycosidic bond between glucose and alpha D glucose unit
What are Disaccharides?
A disaccharide is a type of carbohydrate that is created by combining two units of glucose. Succrose, maltose, and lactose are the three most prevalent kinds of disaccharide. The other disaccharides are lactulose, trehalose, and cellobiose, which are less well-known. Dehydration reactions are those that occur when one water molecule is eliminated by combining two monosaccharides, resulting in the formation of a molecule of a disaccharide.
The common disaccharides are sucrose, lactose, and maltose. MaltoseTwo alpha D glucose units make up the disaccharide maltose, usually referred to as malt. An alpha 1,4 glycosidic linkage connects the two glucose units. The enzymes maltase and isomaltase break down the molecules of maltose into two glucose molecules in the human small intestine mucosa, which are then absorbed by the body. After cellulose, starch is the carbohydrate that is most prevalent in plant cells.
Formula --C12H22O11
Used extensively in the manufacturing of alcohol.Dental caries can be brought on by free maltose as well as maltose produced in the mouth as a result of starch digestion.The small intestine contains the enzymes maltase and isomaltase, which break down maltose into two glucose units that are then absorbed. Our bodies have the ability to immediately absorb maltose, which can then be broken down into a glucose unit to produce energy.The high glycemic index of maltose causes it to raise blood sugar levels.To know more about Disaccharides,Refer to:
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A ga mixture containing oxygen, nitrogen, and He ha a total preure of 189. 9 kPa. If PO2 = 104. 6 kPa and PN2 = 13. 0 kPa, what i PHe ?
The partial pressure of helium (PHe) in this gas mixture is 72.3 kPa.
To find the partial pressure of helium (PHe) in a gas mixture containing oxygen, nitrogen, and helium, you can use the equation:
Total Pressure (PT) = PO2 + PN2 + PHe
Given that the total pressure of the mixture is 189.9 kPa, and the partial pressures of oxygen and nitrogen are given as 104.6 kPa and 13.0 kPa, respectively, you can use these values to solve for PHe.
PT = PO2 + PN2 + PHe
189.9 kPa = 104.6 kPa + 13.0 kPa + PHe
Solving for PHe:
PHe = PT - PO2 - PN2
PHe = 189.9 kPa - 104.6 kPa - 13.0 kPa
PHe = 72.3 kPa
So, the partial pressure of helium (PHe) in this gas mixture is 72.3 kPa.
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How many sigma bonds and pi bonds does this molecule have?
(CH3)2CCHCH2CCCOOH
The sigma bonds and pi bonds does the given molecule have is :
(CH₃)₂CCHCH₂CCCOOH , 19 sigma bond and 4 pi bond.
The given molecule given below :
(CH₃)₂CCHCH₂CCCOOH
H H H O
| | | ||
H₂ - C - C = C - C - C ≡ C - C - O - H
| |
H - C - H H
|
H
The single bond in the molecule represent the one sigma bond . the double bond in the molecule represent the one sigma bond and the one pi bond. The triple bond in the molecule represent the one sigma bond and the two pi bond.
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Draw The Lewis Structure Of COF2. Include Lone Pairs.
The Lewis Structure Of COF2 is C: O=F-F: .The Lewis structure of COF2 consists of one carbon atom, two oxygen atoms, and two fluorine atoms. The carbon atom is the central atom and is bonded to the two oxygen atoms.
In turn, each oxygen atom is bonded to one of the fluorine atoms. The Lewis structure indicates that each of the four atoms involved in the molecule has an octet of electrons. The carbon atom has 4 valence electrons and each oxygen atom has 6 valence electrons. Thus, the carbon atom and each oxygen atom will form two covalent bonds with the fluorine atoms.
The two covalent bonds that the carbon atom forms with the oxygen atoms are single bonds, while the two covalent bonds that the oxygen atoms form with the fluorine atoms are double bonds. The structure also includes two lone pairs on the oxygen atoms. Lone pairs are unshared electrons that are held by atoms in a molecule. In the case of COF2, both oxygen atoms have two lone pairs of electrons. These lone pairs are not involved in any bonding and help to stabilize the molecule.
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aspirin is a weak acid with a pka of 3.5. at equilibrium, wwhat is the ratio of aspirin concentration in blood (ph
The H+ ions separate from the aspirin at pH higher than pKa and then become deprotanated-ve charge.
What is the ratio of aspirin concentration in blood?In the protonated form, aspirin is more easily absorbed as it is neutral at pH 1.5 and can easily pass through the lipid bilayer. The absorption in the stomach is very big.Aspirin, also known as acetylsalicylic acid (ASA), is a nonsteroidal anti-inflammatory drug (NSAID) used to reduce pain, fever, and/or inflammation, and as an antithrombotic. Specific inflammatory conditions which aspirin is used to treat include Kawasaki disease, pericarditis, and rheumatic fever.Aspirin is also used long-term to help prevent further heart attacks, ischaemic strokes, and blood clots in people at high risk.For pain or fever, effects typically begin within 30 minutes. Aspirin works similarly to other NSAIDs but also suppresses the normal functioning of platelets.One common adverse effect is an upset stomach.More significant side effects include stomach ulcers, stomach bleeding, and worsening asthma.Bleeding risk is greater among those who are older, drink alcohol, take other NSAIDs, or are on other blood thinners. Aspirin is not recommended in the last part of pregnancy.[tex]pH=pK\alpha +[/tex]㏒[tex]\frac{A-}{HA}[/tex]
㏒[tex]\frac{A-}{HA} =pH-pK\alpha[/tex]
㏒[tex][\frac{A-}{HA} ][/tex]=1.5-3.5
[tex][\frac{A-}{HA} ]=10^{-2}[/tex]
[tex][\frac{A-}{HA}]=\frac{1}{100}[/tex]
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The acid in aspirin, acetylsalicylic acid, is very weak. Because of this, it must be more in unnionized form in the stomach's acidic pH. It must be more ionized for the intestine's alkaline pH.
Would you anticipate that an aspirin structure with a pKa lower 3.5 would be more easily absorbed in the stomach or small intestine?For the same pH range, the small intestine absorbs more nutrients than the stomach. The intestinal absorption of aspirin is greater than the stomach absorption of the drug at pH 3.5 or 6.5.
What in chemistry is a pKa?The base-10 negative logarithm pKa serves as the acid dissociation constant (Ka) of a solution. One way to gauge an acid's potency is by looking at its pKa value. A stronger acid is indicated by a lower pKa value. A lower value, for instance, signifies that the acid dissociates completely in water.
Ratio of aspirin in blood:[tex]pH = pKa + log\frac{A-}{HA}[/tex]
[tex]log\frac{A-}{HA} = pH - pKa[/tex]
[tex]log\frac{A-}{HA} = 1.5 - 3.5[/tex]
[tex][\frac{A-}{HA}] = 10^{-2}[/tex]
[tex][\frac{A-}{HA}] = \frac{1}{100}[/tex]
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What substances are produced when an acid reacts with base?
Answer:
Salt and water is produced.
For example:-
NaOH(base)+HCl(Acid)=>NaCl(salt)+H20(water)
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Draw the structure of cyclohexane.
Explanation:
Cyclohexane ends with an -ane, which means that we have an alkane. An alkane consists of carbons and hydrogens with only single bonds. Hex means six, so there are six carbons. Cyclo means we have a ring, which is the six carbons each with two hydrogens, all single bonds.
Each carbon atom can form bonds with two hydrogens because carbon can form four bonds, which are from the two carbons and two hydrogens.
Please help me with this
8) Percent yield = (0.48 g / 36 g) x 100% = 1.33%
9) Percent yield = (248 g / 176 g) x 100% = 141%
10) Percent yield = (45 g / 120 g) x 100% = 37.5%
What is a chemical reaction's yield in percentage terms?The same units must be used for both the theoretical and actual yields (moles or grams). A chemical reaction produces 0.5 g of product. The calculated yield is 1.6 g at its highest. What is the reaction's yield in terms of percent? Actual yield minus theoretical yield equals 100% in percentage yield. The reaction's percentage yield is 31.25% as a result.
8) Known: 2 H2(g) + O2(g) → 2 H2O(1)
Unknown: percent yield
Steps:
Calculate the theoretical yield of water by using the balanced equation.
Compare the theoretical yield to the actual yield of water obtained from the experiment.
Use the formula: (Actual yield / Theoretical yield) x 100% = percent yield
Solution:
Theoretical yield of water = (2 moles H2 x 18 g/mol H2O) = 36 g
Actual yield of water = 0.48 g
Percent yield = (0.48 g / 36 g) x 100% = 1.33%
9) Known: 2 C2H6(g) + 7 O2(g) → 6 H2O(l) + 4 CO2(g)
Unknown: percent yield
Steps:
Calculate the theoretical yield of CO2 by using the balanced equation.
Compare the theoretical yield to the actual yield of CO2 obtained from the experiment.
Use the formula: (Actual yield / Theoretical yield) x 100% = percent yield
Solution:
Theoretical yield of CO2 = (2 moles C2H6 x (4 moles CO2 / 2 moles C2H6)) = 4 moles CO2
Theoretical yield of CO2 = 4 moles CO2 x (44 g/mol CO2) = 176 g
Actual yield of CO2 = 248 g
Percent yield = (248 g / 176 g) x 100% = 141%
10) Known: 4 NH3(g) + 5 O2(g) → 4 NO(g) + 6 H2O(1)
Unknown: percent yield
Steps:
Calculate the theoretical yield of NO by using the balanced equation.
Compare the theoretical yield to the actual yield of NO obtained from the experiment.
Use the formula: (Actual yield / Theoretical yield) x 100% = percent yield
Solution:
Theoretical yield of NO = (4 moles NH3 x (4 moles NO / 4 moles NH3)) = 4 moles NO
Theoretical yield of NO = 4 moles NO x (30 g/mol NO) = 120 g
Actual yield of NO = 45 g
Percent yield = (45 g / 120 g) x 100% = 37.5%
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A helium balloon has a volume of 735 ml at ground level. The balloon is transported to an elevation of 5 km, where the pressure is 0. 8 atm. At this altitude, the gas occupies a volume of 1286 ml. Assuming that the temperature is constant, what was the ground level pressure?.
The ground pressure on that condition will be 1.4 Atm. The condition of that space is isotherms, to solve it we use Boyle's law in isotherms condition.
How to find the ground level pressure?To solve this problem we are using Boyle's law. As Boyle's law state that " a gas's pressure and volume are inversely proportional" which is formulated as P1 x V1 = P2 x V2. As per data given: early volume(V1) = 735 mL; pressure(P2) = 0.8 atm; and volume(V2) = 1286 mL. The calculation will be:
P1 x V1 = P2 x V2
P1 x 735 = 0.8 x 1286
P x 735 = 1028.8
P = 1.4 Atm
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How many grams of phosphoric acid are formed from 36.4 grams of calcium phosphate?
Answer: Calcium phosphate (Ca3(PO4)2) and phosphoric acid (H3PO4) are two different compounds.
Explanation: In order to determine how many grams of phosphoric acid are formed from 36.4 grams of calcium phosphate, we would need to know the reaction taking place and the stoichiometry of that reaction. Without that information, it is impossible to determine how many grams of phosphoric acid are formed.
Answer:
calcium phosphate (ca3(po4)2) and phosphoric acid(h3po4)
What is the the number of 6p electrons in Po?
The number of 6p electrons in PO i.e. Polonium is four as the outer electronic configuration of Po is 6s^2 6p^4.
Po or Polonium in the periodic table belongs to the period 6 and group 16. As Po belongs to the period six thus we can take n=6. Also as the group of Po is 16 thus the element belongs to the p-block of the modern periodic table. By applying the orbital notation method we can find the formula as ns2np4. Putting the formula into the given element we can find the outer electronic configuration as 6s^2 6p^4 where p=4
We can understand that in the periodic table given by Mendeleev electronic configuration method is applied where it helps in understanding how in any atomic orbital electrons are distributed. The same is applied in the case of Polonium which helps in understanding that it has two 6s electrons and four 6p electrons.
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Beryllium has 2 valence
electrons. Which element could
pair with it in a 1 Be : 1 atom
ratio?
A. Li (1 valence electron)
B. P (5 valence electrons)
C. Br (7 valence electrons)
D. Se (6 valence electrons)
Beryllium with 2 valence electrons would be able to pair with Se with 6 valence electrons. Option D.
Formation of bondsAtoms form bonds with one another based on the number of valence electrons present in their outermost shell. Electrons are either donated, received, or paired.
In order for bonds to form, the participating atoms try to assume an octet structure, In other words, each atom tries to have a completely filled outermost shell. Thus, atoms with only a few electrons in their outermost shells readily donate them while those with just a few electrons remaining to fill up their outermost shell readily accept them.
Be has 2 outermost electrons, Se has 6. Be will readily donate the 2 outermost electrons while Se will readily accept 2 electrons for completely filled shell.
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percent composition by mass of potassium in potassium carbonate
Answer:
56.58 percent
Compounds have no charge. True or False
Answer:
False.
Compounds can have a charge. A compound is a substance made up of two or more elements that are chemically bonded together. The charge on a compound depends on the number of electrons in the outermost energy level, or valence electrons, of the atoms that make up the compound. If the compound has an equal number of protons and electrons, it will have no charge, and is called a neutral compound.
However, if there is an unequal number of protons and electrons, the compound will have a charge and is called an ionic compound. For example, the compound sodium chloride, NaCl, is made up of positively charged sodium ions and negatively charged chloride ions, and therefore has an overall charge of neutral.
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When 50.2g of magnesium is combined with 40.8g of oxygen: 1. How many grams of magnesium oxide should be produced.
When 50.2g of magnesium is combined with 40.8g of oxygen, 91 grams of magnesium oxide should be produced.
What is law of conservation of mass?The law of conservation of mass states that the total mass of a closed system remains constant regardless of the chemical or physical changes that take place within it.
This law suggests that the amount of reactants of a chemical reaction must equate the amount of products of that reaction.
According to this question, magnesium reacts with oxygen gas to produce magnesium oxide. If 50.2g of magnesium reacts with 40.8g of oxygen, then;
50.2 + 40.8 = 91 grams of magnesium oxide will be produced.
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