Answer:
Si, Sn, Cs
Explanation:
Atomic no. Atomic radius
Silicon Si_______14___________0.117
Tin Sn______50___________0.140
cesium Cs______55___________0.262
Silicon is the smallest among these
what does rows represent on the periodic table
Answer:
Rows on the periodic table represents a period, which is the number of energy levels or rings. It is the last shell which valence electrons are on.
For example the first row waas Hydrogen and Helium which each have one energy level.
The esecond row has Carbon and Oxygen which has two energy level.
The third row has Sodium which has three energy levels and so on.
Three quantum numbers are derived from Schrodinger’s equation that describe the probability of finding an electron around a nucleus: the principal quantum number, the angular momentum quantum number, and the magnetic quantum number. Explain each quantum number, including associated shapes, numbers, letters, and values in your own words.
Principle: Orbital size & main energy level
Angular: Orbital shape
Magnetic: Orbital orientation
Orbital size is Principle; main energy level is Principle; shape is Angular; orientation is Magnetic
Principle:
imagine a bullseye. each ring shows how far its from the nucleus
Angular:
0 looks like circle
1 looks like a bowtie
2 looks like a flower or 4 leaf clover
3 looks like multiple lobes
Principle Quantum Number: It describes the size of the orbital and the main energy level. It is represented by n. Where, n = 1,2,3,4....stands for K, L, M, N shell and so on..
Angular momentum Quantum Number : It describes the shape of the orbital. It is represented as 'l'. The value of l ranges from 0 to (n-1). For l = 0,1,2,3... the orbitals are s, p, d, f...
Magnetic Quantum Number : It describes the orientation of the orbitals. It is represented as . The value of this quantum number ranges from . When l = 2, the value of will be -2, -1, 0, +1, +2.
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An unidentified covalent molecular compound contains only carbon, hydrogen, and oxygen. When 7.40 mg of this compound is burned, 17.80 mg of CO2 and 2.08 mg of H2O are produced.
The freezing point of camphor is lowered by 26.4°C when 3.044 g of the compound is dissolved in 18.00 g of camphor (Kf = 40.0°C kg/mol).
What is the molecular formula of the unidentified compound?
Choose appropriate coefficients in the molecular formula below.
C H O
The molecular formular shows all the atoms in the compound. The molecular formula of the compound is C15H10O5.
What is molecular formula?The molecular formula is the formula of the compound that shows the total number of atoms in a compound.
We know that;
ΔT = K m i
ΔT = 26.4°C
K = 40.0°C kg/mol
m = ?
i = 1
26.4°C = 40.0°C kg/mol * m * 1
m = 26.4°C/40.0°C kg/mol = 0.66 m
We know that
m = mass/molar mass ÷ mass of solvent(in Kg)
Let the molar mass be MM
m = 3.044 g/MM ÷ (18 * 10^-3 Kg)
0.66 m = 3.044 g/0.018MM
0.66 m * 0.018MM = 3.044 g
MM = 3.044 g/0.66 m * 0.018
MM = 256 g/mol
Now;
Mass of C = 17.80 * 10^-3/44 * 12 = 0.00485 g
Moles of C = 0.00485 g/12 g/mol = 0.0004 moles
Mass of H = 2.08 * 10^-3/18 * 2 = 0.0002 g
Moles of H = 0.0002 g/1 g/mol = 0.0002 moles
Mass of O = [7.40 * 10^-3 - (0.00485 + 0.0002)] = 0.00235 g
Moles of O = 0.00235 g/16 g/mol = 0.000147 moles
Divide through by the lowest number of moles;
C - 0.0004/0.000147 H - 0.0002/0.000147 O - 0.000147 /0.000147
C - 3 H - 2 O - 1
The empirical formula is C3H2O
So;
[3(12) + 2(1) + 1(16)]n = 256
[36 + 2 + 16]n = 256
n = 5
Molecular formula = C15H10O5
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I need help it’s calculating ph
What is the difference between typhoons and hurricanes?
A. Wind speed
B. Strength of the wind
C. Amount of rainfall
D. Place of origin
What is the difference between typhoons and hurricanes?
A. Wind speed
B. Strength of the wind
C. Amount of rainfall
D. Place of origin
typhoons and hurricanes are both tropical cyclones its only one difference is the place of origin
option D place of origin
12)
What are the products of photosynthesis?
A)
glucose and oxygen
B)
carbon dioxide and water
C)
carbon dioxide and oxygen
D)
glucose and carbon dioxide
m A 10.00g sample of a substance is found to contain 5.12g of water. What is the percent by of water in the compound? A
. 5.12% B. 4.88% C. 48.8% D. 51.2%
Answer:
The answer is D) 51.2%
Explanation:
5.12g of 10.00g of the substance is water:
percentage of water= 5.12 x 10.00 =51.2%
Answer:
b
Explanation:
What is the phase label on H3O+?
Answer:
I think it’s aq but your choice.
Explanation:
15.0 g of water at 0.0 °C are added to 40.0 g of water at 40.0 °C. What is the final
temperature of the mixture?
Answer:
40.0 c
Explanation:
Answer:
29.09 degree Celsius is final temperature
what best describes the bonding in the compound ICl?
Most of the food that organisms eat can be traced back to? .
A. plants
B. soil
C. animals
D. bacteria
Answer:
A. Plants
Explanation:
Plants are producers, which make their own food. Other organisms, such as rodents, birds, and wild cats, are consumers, which receive their energy from plants or other consumers.
Which statement best predicts and explains the product of a single displacement reaction when the cation (A) with an oxidation number of +2 and an anion (B) with the oxidation number of -3 react and form a compound?
A+2B-3 is the predicted formula when each metal cation has a charge of +2 and each non metal has a charge of -3.
B2A3 is the final formula for the metal anion bonding to the non-metal cation in a 2:3 ratio.
A3B2 is the predicted formula with an overall charge of the compound being zero and each atom has 8 valence electrons in their outermost electron shell.
A3B2 is the predicted formula is made when each metal cation gains three electrons from the anion while each nonmetal loses 2 electrons to each of the cations.
The statement that best predicts and explains the product of a single displacement reaction is ; ( C ) A3B2 is the predicted formula with an overall charge of the compound being zero and each atom has 8 valence electrons in their outermost electron shell.
Octet stateGiven that the oxidation number is +2 shows that it will be an octet when it donates its 2 electrons. also for octet B it will become complete when it accepts 3 electrons. Therefore in order to balance out the octet of each atom is by cross multiplying to get A3B2.
Hence we can conclude that The statement that best predicts and explains the product of a single displacement reaction is ; A3B2 is the predicted formula with an overall charge of the compound being zero and each atom has 8 valence electrons in their outermost electron shell.
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If 32.00 mL of a solution of Ca(OH)2 requires 16.08 mL of a 2.303 M solution of HNO2 for complete titration, what is the molarity of the Ca(OH)2 solution?
For the equilibrium that exists in an aqueous solution of nitrous acid ... calcium hydroxide is dissolved in water until the pH of the solution is 11.44.
If you did not neutralize the saturated citric acid before you poured it down the drain, describe the potential consequences to the plumbing and the environment.
The plumbing will be corroded and could lower the pH of natural water bodies
What is acidic waste water?The term acidic waste water means water that has a low pH due to the presence of an acidic substance inside the waste water. As we know, citric acid has a low pH.
If this acid is disposed without proper neutralization, the plumbing will be corroded due to the fact that the acid will react with the plumbing material.
Also, this acidc waste could lower the pH of natural water bodies when it gets into natural water bodies.
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100.0 grams of water at 4.0°C is heated until its temperature is 37°C. If the specific heat of water is 4.18 J/g°C, calculate the amount of heat energy needed to cause this rise in temperature.
The amount of heat energy needed to cause the rise in temperature of the water initially at 4 degreess Celsius is 13,794 J.
Heat required to raise the temperature of the water
The quantity of heat required to raise the temperature of the water is calculated as follows;
Q = mcΔθ
where;
m is mass of the waterc is heat capacityΔθ is change in temperatureQ = 100 x 4.18 x (37 - 4)
Q = 13,794 J
Thus, the amount of heat energy needed to cause the rise in temperature of the water initially at 4 degreess Celsius is 13,794 J.
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Write the formula for each of the following...I'm not telling you what kind of compound it
is, you need to figure it out!!
a. strontium bromide___________
b. tricarbon tetraphosphide_________
c. beryllium phosphate__________
d. calcium phosphide__________
e. manganese (II) thiosulfate_____
f. nitrogen monoxide
Why are polar and non polar liquids immiscible?
Answer:
When both liquid molecules are polar then they can attract one another - which leads to mixing (miscibility).
When the molecular liquid is nonpolar, then the water molecules attract only one another while ignoring the nonpolar liquid. the result is that the two liquids are immiscible.
Explanation:
I hope it helps mark me brainliest^^
Answer:
They lack lack inter-molecular forces to disolve in the polar liquids.
Explanation:
Miscibility is the property of two substances to mix in all proportions (that is, to fully dissolve in each other at any concentration). Polar molecules like water will mix well with some other polar molecules but things like oil which are non polar do not mix well with polar molecules. This is because the oil and water lack inter-molecular forces to keep them mixed.
What is a calcite?
1. mineral
2. erosion
3. marble
4. aragonite
I had no idea what subject I have to put it on. 0_0
HELP ASAP
Answer: 1. Mineral
Explanation:
Calcite is a "white or colorless mineral consisting of calcium carbonate" (Oxford Languages).
By this definition, the answer to your question is option 1.
The image attached is from geology.com and is a picture of calcite.
Use this equation: N2 + 3H2 → 2NH3, for the following problems:
1. If 2.5 moles of N2 react, how many grams of NH3 can be produced?
2. If 10.0 moles of NH3 are produced, how many grams of H2 would be required?
Use this equation: B2O3 + 3Mg → 3MgO + 2B, for the following problems:
3. How many grams of boron can be obtained from 8 moles of B2O3?
4. How many grams of magnesium are required to produce 4 moles of boron?
Use this equation: S8 + 12O2 → 8SO3, for the following problems:
5. How many grams of oxygen is needed to produce 7.5 moles of sulfur trioxide?
6. How many grams of sulfur trioxide can be produced from 2 moles of octasulfur?
Answer:hop this helps
Explanation:
3.Using Balanced Equations: C5H12+802–5CO2+6H20
A. If you have 358.4 Liters of O2 gas then what's the volume of CO2
b. If you have 360 grams of C5H12 then what's the mass of H2O
Answer:
i think b is the answer hope this helps:))
How us butan -2-ol prepared from ethanal by using grignard reagent?
Answer:
Grignard reagents are made through the addition of magnesium metal to alkyl or alkenyl halides. The halide can be Cl, Br, or I (not F). It’s slightly easier to make Grignards from the iodides and bromides, however. Note what’s happening here – the magnesium is “inserting” itself between the carbon and the halide. This halide the “X” referred to when we refer to Grignard reagents as “RMgX”.
formation-of-grignard-reagents-from-alkyl-or-alkenyl-halides
Reaction Of Grignard Reagents With Aldehydes To Give Secondary Alcohols
One of the most common uses of Grignard reagents is in their reaction with aldehydes and ketones to form alcohols. In the first step, the Grignard forms the carbon-carbon bond. This results in an alkoxide (the conjugate base of an alcohol). To form the alcohol, it’s necessary to add acid at the end of the reaction (in what’s called the “workup” step). This is shown here as “H3O+” (the “X” is just the counter-ion, a spectator here)
reaction-of-grignard-reagents-with-aldehydes-to-give-secondary-alcohols
Reaction Of Grignard Reagents With Ketones To Give Tertiary Alcohols
The reaction behaves similarly with ketones. Again, there’s nothing special about the Cl here – it all depends on how you made the Grignard in the first place.
eaction-of-grignard-reagents-with-ketones-to-give-tertiary-alcohols
Grignards Add Twice To Esters And Acid Halides
Grignard reagents will also add to esters. What makes these reactions a little more complicated is that they add twice. The net result (after addition of acid) is a tertiary alcohol. This is also the case for acid halides (acyl halides) and anhydrides. One notable exception is carboxylic acids (more on that below).
reaction-of-grignard-reagents-with-esters-to-give-tertiary-alcohols-double-addition
reaction-of-grignard-reagents-with-acid-halides-to-give-tertiary-alcohols-double-addition
Addition Of Grignard Reagents To Epoxides
Another important reaction of Grignard reagents is that they will add to epoxides to form carbon-carbon bonds. One thing to keep in mind here is that the tendency is for them to add to the less substituted end of the epoxide – that is, the less sterically hindered end. You can think of this reaction as being essentially similar to an SN2 reaction. After addition of acid, an alcohol is obtained.
reaction-of-grignard-reagents-with-epoxides-to-give-alcohols
Reaction Of Grignard Reagents With Carbon Dioxide To Give Carboxylic Acids
Grignard reagents also add to carbon dioxide (CO2) to form carboxylates, in a reaction similar to their reactions with ketones and aldehydes. The carboxylates are converted to carboxylic acids after addition of acid (such as our trusty H3O(+) ).
reaction-of-grignard-reagents-with-co2-carbon-dioxide-to-give-carboxylic-acids
Grignard Reagents Are Strong Bases – Protonation (And Deuteration)
Finally, since Grignard reagents are essentially the conjugate bases of alkanes, they’re also extremely strong bases. This means that sometimes acid-base reactions can compete with their nucleophilic addition reactions. One common situation where this crops up is when Grignard reagents are added to carboxylic acids. It’s easy to forget that carboxylic acids… are acids. This means that instead of adding to the carbonyl, they react with the proton instead and form the carboxylate salt.
reaction-of-grignard-reagents-with-acidic-hydrogens-acids-to-incorporate-h-and-deuterium
This can also be used to convert alkyl halides to alkanes. First you treat it with magnesium, and then you treat the Grignard with a strong acid. This gives you the alkane. You can also use this to introduce deuterium (D) into molecules! The first step is to make the Grignard reagent. The second is to treat that Grignard with a deuterated acid such as D2O. This gives you the deuterated alkane!
Mechanism: Addition Of Grignard Reagents To Aldehydes And Ketones
So how does it work? The key to the Grignard reagent is actually very simple. When you think about the relative electronegativities of carbon (2.5) and magnesium (1.1), the bond between carbon and magnesium is polarized toward carbon. That means that carbon is more electron rich than magnesium and is actually nucleophilic! Here’s a closer look.
mechanism-for-addition-of-grignard-reagents-to-aldehydes-or-ketones
In the reaction of Grignards with aldehydes, the carbon attacks the carbonyl carbon and performs a 1,2-addition to give an alkoxide. In the second step, acid is added to give you the alcohol.
The two main types of weathering are
a
mechanical and physical
b
physical and kinetic
c
chemical and physical
d
chemical and acidic
Answer:
c. chemical and physical
How many grams of aluminum will be deposited by 0.1F? (Al=27) a.0.3g b. 0.9. c. 9.0g. d. 2.7g
Based on the charge on the aluminium ion, 0.9 g of aluminium are deposited by 0.1 F of electricity.
What is electrolysis?Electrolysis is the decomposition of a substance known as an electrolyte when electric current is passed through it.
The mass and hence moles an electrolyte deposited when current is passed through it depends on the charge on the ion.
Aluminium ion has a charge of +3 and requires 3F of electricity to deposit 1 mole or 27 g of aluminium
0.1 F will discharge = 0.1/3 × 27 g of aluminium
mass of aluminium deposited = 0.9 g of aluminium.
Therefore, 0.9 g of aluminium are deposited by 0.1 F of electricity.
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8. Subshells half-filled with electrons are particularly stable. Can you suggest a possible physical basis for this claim?
The stability of atoms whose subshells are half-filled with electrons is due to equilibrium and symmetry.
How does subshells half-filled with electrons confer stability?The stability of an atom of an element depends on the number of electrons in its valence shell.
Atoms whose valence shells are completely filled are particularly stable atoms.
Similarly, subshells half-filled with electrons are particularly stable.
The stability of subshells half-filled with electrons can be explained based on equilibrium and symmetry.
A half-filled subshell distributes the energy of the electrons evenly and symmetrically such that the atom attians stability.
Therefore, stability of subshells half-filled with electrons is due to equilibrium and symmetry.
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A gas occupies a volume of 50.0 mL at 27°C. At what temperature, in °C, would the pressure be
101.3 kPa if the volume remains constant?
Answer:
i believe 223
Explanation:
T2 + 500k = 223 C*
Problem To Solve:
Scenario: you have a very bad head-ache so you run to the pharmacy to grab some medicine and are immediately over-whelmed with your options. You decide to buy the cheapest option to cure your headache.
Availability:
Excedrin is available as a 200 caplet bottle for $15.51 and each caplet contains 250- mg of acetaminophen (the active ingredient in Excedrin).
Advil is available as a 300 tablet bottle for $15.00 and each tablet contains 200-mg of Ibuprofen (the active ingredient in Advil).
Tylenol is available as a 225 pill bottle for $14.97 and each pill contains 500mg of a paracetamol (the active ingredient in Tylenol).
Dosage Information:
Acetaminophen is dosed as 240 mg per 35 pounds of body mass.
Ibuprofen is dosed at 113 mg per 25 pounds of body mass.
Paracetamol is dosed at 102mg per 15 pounds of body mass.
Active ingredient information:
Acetaminophen has the chemical formula: C8H9NO2
Ibuprofen has the chemical formula C13H18)2.
Paracetamol has the chemical formula C8H9NO2.
How:
Calculate the cost of treating your own headache for each medicine based on your own body weight = 130 pounds.
Clearly write out and organize all the conversion factors, then write out the conversion for each medicine. Once you have concluded the cheapest option for curing your headache, calculate the cost per individual molecule of your pain reliever.
Please help me solve this and write all the conversion factors, and write out the conversion for each medicine. Thank you!
Based on the drug dosage provided, cheapest drug for treating headache is Tylenol at a cost of 3.34×10^-23 $/molecule.
What is a drug dosage?A drug dosage is the amount of a drug taken by an individual that produces a therapeutic effect.
The dosage of each drug is given below:
Acetaminophen is dosed as 240 mg per 35 pounds of body mass.Ibuprofen is dosed at 113 mg per 25 pounds of body mass.Paracetamol is dosed at 102mg per 15 pounds of body mass.Amount of each drug required by individual is as follows:
Acetaminophen = 240 mg/35 × 130 = 891.43 mg
Ibuprofen = 113 mg/25 × 130= 587.6 mg
Paracetamol = 102mg/15 × 130 = 884 mg
Cost of drug per mg of active ingredient is as follows;
Excedrin = $15.51/(200 * 250 mg) = 0.0003102 $/mg
Advil = $15/(300 * 200mg) = 0.00025 $/mg
Tylenol = $14.97/(500mg × 225) = 0.000133 $/mg
Cost of each drug for treatment of headache:
Excedrin = 0.0003102 $/mg × 891.43 mg = $0.278
Advil = 0.00025 $/mg × 587.6 mg = $0.147
Tylenol = 0.000133 $/mg × 884 mg = $0.118
Thus, Tylenol is the cheapest drug for treating headache.
Molar mass of paracetamol = 151 g = 151000 g
There are 6.02 × 10^23 molecules in 151000 mg of paracetamol.
Cost per molecule = 0.000133 $/mg × (15000 mg/6.02 × 10^23)
Cost per molecule = 3.34 × 10^-23 $/molecule
Therefore, the cheapest drug for treating headache is Tylenol at a cost of 3.34×10^-23 $/molecule.
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How many grams of rock salt, NaCl, do you need to add to a 3.78 kg of ice, to get the temperature
to drop to -19C?
1129.9 grams of rock salt, NaCl needs to be added to a 3.78 kg of ice, to get the temperature to drop to -19C .
What is freezing point depression?Freezing point depression refers to a property of solutions where addition of a solute lowers the normal freezing point of the solvent.
The Blagden's Law given as the equation above is used to determine the freezing point depression of ice:
[tex]ΔT = iK_fm[/tex]where;
ΔT = Change in temperature in °Ci = van 't Hoff factorKf = molal freezing point depression constantm = molality of the solute in mol solute/kg solvent.For NaCl, i = 2
Kf for water/ice = 1.86 °C kg/mol
molalityof NaCl = (mass/molar mass
l)/kg of ice
mass of NaCl = molality × mass of ice × molar massmolar mass of NaCl = 58.5
mass of ice = 3.78 kg
Let molality of NaCl = m
ΔT = 19 °C
Substituting the values:
19 = 2 x 1.86 °C kg/mol x m
m = 5.11 mol/kg
mass of NaCl = 5.11 × 3.78 × 58.5
mass of NaCl = 1129.9 g
Therefore, the mass in grams of rock salt, NaCl that needs to be added to a 3.78 kg of ice, to get the temperature to drop to -19C is 1129.9 g
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When calcium carbonate is heated strongly, carbon dioxide is evolved.
CaCO3 > CaO + CO2
If 4.74g of calcium carbonate is heated, what volume of CO2 would be produced when collected at STP?
Show all steps (Answer: 1.06L)
If 4.74 g of calcium carbonate is heated, the volume of [tex]CO_2[/tex] that would be produced at STP will be 1.08 L
Volume of gas at STPFrom the equation of the reaction:
[tex]CaCO_3 --- > CaO + CO_2[/tex]
The mole ratio of [tex]CaCO_3[/tex] and [tex]CO_2[/tex] is 1:1
Mole of 4.74 g [tex]CaCO_3[/tex] = 4.74/100 = 0.0474 moles
Equivalent mole of [tex]CO_2[/tex] = 0.0474 moles
1 mole of gas at STP = 22.71 L
0.0474 moles at STP = 22.71 x 0.0474 = 1.08 L
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Best way to deal with calculations in chemistry?
Answer: Look up a video, and they will tell/show you.
▲ Two general chemistry students working together in the lab weigh out 0.832 g of CaCl2 2 H2O into a crucible. After heating the sample for a short time and allowing the crucible to cool, the students determine that the sample has a mass of 0.739 g. They then do a quick calculation. On the basis of this calculation, what should they do next? (a) Congratulate themselves on a job well done. (b) Assume the bottle of CaCl2 2 H2O was mislabeled; it actually contained something different. (c) Heat the crucible again, and then reweigh it.
After heating the crucible, cooling, and weighing the sample as 0.739 g, the students should have heated the crucible again and then reweigh the sample until a constant weight is obtained.
Drying samples with cruciblesThe sample being heated, CaCl2 2 H2O, contains water of hydration.
In order to arrive at an anhydrous sample of the salt, all the water molecules must be completely evaporated off by heating.
To do so, the sample should have been heated to constant weight by repeated heating and weighing until there is no longer a change in the weight of the sample.
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